p2m.c revision 0160676bba69523e8b0ac83f306cce7d342ed7c8
1b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge/* 2b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge * Xen leaves the responsibility for maintaining p2m mappings to the 3b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge * guests themselves, but it must also access and update the p2m array 4b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge * during suspend/resume when all the pages are reallocated. 5b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge * 6b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge * The p2m table is logically a flat array, but we implement it as a 7b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge * three-level tree to allow the address space to be sparse. 8b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge * 9b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge * Xen 10b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge * | 11b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge * p2m_top p2m_top_mfn 12b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge * / \ / \ 13b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge * p2m_mid p2m_mid p2m_mid_mfn p2m_mid_mfn 14b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge * / \ / \ / / 15b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge * p2m p2m p2m p2m p2m p2m p2m ... 16b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge * 17b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge * The p2m_mid_mfn pages are mapped by p2m_top_mfn_p. 18b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge * 19b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge * The p2m_top and p2m_top_mfn levels are limited to 1 page, so the 20b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge * maximum representable pseudo-physical address space is: 21b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge * P2M_TOP_PER_PAGE * P2M_MID_PER_PAGE * P2M_PER_PAGE pages 22b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge * 23b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge * P2M_PER_PAGE depends on the architecture, as a mfn is always 24b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge * unsigned long (8 bytes on 64-bit, 4 bytes on 32), leading to 25a3118beb6a8cbe77ae3342125d920205871b0717Konrad Rzeszutek Wilk * 512 and 1024 entries respectively. 26f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * 27f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * In short, these structures contain the Machine Frame Number (MFN) of the PFN. 28f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * 29f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * However not all entries are filled with MFNs. Specifically for all other 30f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * leaf entries, or for the top root, or middle one, for which there is a void 31f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * entry, we assume it is "missing". So (for example) 32f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * pfn_to_mfn(0x90909090)=INVALID_P2M_ENTRY. 33f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * 34f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * We also have the possibility of setting 1-1 mappings on certain regions, so 35f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * that: 36f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * pfn_to_mfn(0xc0000)=0xc0000 37f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * 38f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * The benefit of this is, that we can assume for non-RAM regions (think 39f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * PCI BARs, or ACPI spaces), we can create mappings easily b/c we 40f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * get the PFN value to match the MFN. 41f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * 42f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * For this to work efficiently we have one new page p2m_identity and 43f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * allocate (via reserved_brk) any other pages we need to cover the sides 44f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * (1GB or 4MB boundary violations). All entries in p2m_identity are set to 45f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * INVALID_P2M_ENTRY type (Xen toolstack only recognizes that and MFNs, 46f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * no other fancy value). 47f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * 48f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * On lookup we spot that the entry points to p2m_identity and return the 49f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * identity value instead of dereferencing and returning INVALID_P2M_ENTRY. 50f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * If the entry points to an allocated page, we just proceed as before and 51f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * return the PFN. If the PFN has IDENTITY_FRAME_BIT set we unmask that in 52f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * appropriate functions (pfn_to_mfn). 53f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * 54f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * The reason for having the IDENTITY_FRAME_BIT instead of just returning the 55f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * PFN is that we could find ourselves where pfn_to_mfn(pfn)==pfn for a 56f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * non-identity pfn. To protect ourselves against we elect to set (and get) the 57f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * IDENTITY_FRAME_BIT on all identity mapped PFNs. 58f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * 59f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * This simplistic diagram is used to explain the more subtle piece of code. 60f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * There is also a digram of the P2M at the end that can help. 61f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * Imagine your E820 looking as so: 62f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * 63f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * 1GB 2GB 64f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * /-------------------+---------\/----\ /----------\ /---+-----\ 65f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * | System RAM | Sys RAM ||ACPI| | reserved | | Sys RAM | 66f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * \-------------------+---------/\----/ \----------/ \---+-----/ 67f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * ^- 1029MB ^- 2001MB 68f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * 69f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * [1029MB = 263424 (0x40500), 2001MB = 512256 (0x7D100), 70f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * 2048MB = 524288 (0x80000)] 71f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * 72f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * And dom0_mem=max:3GB,1GB is passed in to the guest, meaning memory past 1GB 73f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * is actually not present (would have to kick the balloon driver to put it in). 74f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * 75f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * When we are told to set the PFNs for identity mapping (see patch: "xen/setup: 76f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * Set identity mapping for non-RAM E820 and E820 gaps.") we pass in the start 77f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * of the PFN and the end PFN (263424 and 512256 respectively). The first step 78f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * is to reserve_brk a top leaf page if the p2m[1] is missing. The top leaf page 79f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * covers 512^2 of page estate (1GB) and in case the start or end PFN is not 80f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * aligned on 512^2*PAGE_SIZE (1GB) we loop on aligned 1GB PFNs from start pfn 81f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * to end pfn. We reserve_brk top leaf pages if they are missing (means they 82f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * point to p2m_mid_missing). 83f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * 84f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * With the E820 example above, 263424 is not 1GB aligned so we allocate a 85f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * reserve_brk page which will cover the PFNs estate from 0x40000 to 0x80000. 86f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * Each entry in the allocate page is "missing" (points to p2m_missing). 87f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * 88f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * Next stage is to determine if we need to do a more granular boundary check 89f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * on the 4MB (or 2MB depending on architecture) off the start and end pfn's. 90f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * We check if the start pfn and end pfn violate that boundary check, and if 91f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * so reserve_brk a middle (p2m[x][y]) leaf page. This way we have a much finer 92f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * granularity of setting which PFNs are missing and which ones are identity. 93f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * In our example 263424 and 512256 both fail the check so we reserve_brk two 94f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * pages. Populate them with INVALID_P2M_ENTRY (so they both have "missing" 95f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * values) and assign them to p2m[1][2] and p2m[1][488] respectively. 96f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * 97f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * At this point we would at minimum reserve_brk one page, but could be up to 98f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * three. Each call to set_phys_range_identity has at maximum a three page 99f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * cost. If we were to query the P2M at this stage, all those entries from 100f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * start PFN through end PFN (so 1029MB -> 2001MB) would return 101f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * INVALID_P2M_ENTRY ("missing"). 102f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * 103f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * The next step is to walk from the start pfn to the end pfn setting 104f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * the IDENTITY_FRAME_BIT on each PFN. This is done in set_phys_range_identity. 105f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * If we find that the middle leaf is pointing to p2m_missing we can swap it 106f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * over to p2m_identity - this way covering 4MB (or 2MB) PFN space. At this 107f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * point we do not need to worry about boundary aligment (so no need to 108f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * reserve_brk a middle page, figure out which PFNs are "missing" and which 109f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * ones are identity), as that has been done earlier. If we find that the 110f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * middle leaf is not occupied by p2m_identity or p2m_missing, we dereference 111f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * that page (which covers 512 PFNs) and set the appropriate PFN with 112f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * IDENTITY_FRAME_BIT. In our example 263424 and 512256 end up there, and we 113f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * set from p2m[1][2][256->511] and p2m[1][488][0->256] with 114f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * IDENTITY_FRAME_BIT set. 115f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * 116f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * All other regions that are void (or not filled) either point to p2m_missing 117f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * (considered missing) or have the default value of INVALID_P2M_ENTRY (also 118f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * considered missing). In our case, p2m[1][2][0->255] and p2m[1][488][257->511] 119f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * contain the INVALID_P2M_ENTRY value and are considered "missing." 120f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * 121f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * This is what the p2m ends up looking (for the E820 above) with this 122f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * fabulous drawing: 123f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * 124f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * p2m /--------------\ 125f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * /-----\ | &mfn_list[0],| /-----------------\ 126f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * | 0 |------>| &mfn_list[1],| /---------------\ | ~0, ~0, .. | 127f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * |-----| | ..., ~0, ~0 | | ~0, ~0, [x]---+----->| IDENTITY [@256] | 128f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * | 1 |---\ \--------------/ | [p2m_identity]+\ | IDENTITY [@257] | 129f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * |-----| \ | [p2m_identity]+\\ | .... | 130f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * | 2 |--\ \-------------------->| ... | \\ \----------------/ 131f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * |-----| \ \---------------/ \\ 132f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * | 3 |\ \ \\ p2m_identity 133f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * |-----| \ \-------------------->/---------------\ /-----------------\ 134f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * | .. +->+ | [p2m_identity]+-->| ~0, ~0, ~0, ... | 135f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * \-----/ / | [p2m_identity]+-->| ..., ~0 | 136f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * / /---------------\ | .... | \-----------------/ 137f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * / | IDENTITY[@0] | /-+-[x], ~0, ~0.. | 138f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * / | IDENTITY[@256]|<----/ \---------------/ 139f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * / | ~0, ~0, .... | 140f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * | \---------------/ 141f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * | 142a3118beb6a8cbe77ae3342125d920205871b0717Konrad Rzeszutek Wilk * p2m_mid_missing p2m_missing 143a3118beb6a8cbe77ae3342125d920205871b0717Konrad Rzeszutek Wilk * /-----------------\ /------------\ 144a3118beb6a8cbe77ae3342125d920205871b0717Konrad Rzeszutek Wilk * | [p2m_missing] +---->| ~0, ~0, ~0 | 145a3118beb6a8cbe77ae3342125d920205871b0717Konrad Rzeszutek Wilk * | [p2m_missing] +---->| ..., ~0 | 146a3118beb6a8cbe77ae3342125d920205871b0717Konrad Rzeszutek Wilk * \-----------------/ \------------/ 147f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * 148f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * where ~0 is INVALID_P2M_ENTRY. IDENTITY is (PFN | IDENTITY_BIT) 149b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge */ 150b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 151b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge#include <linux/init.h> 152b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge#include <linux/module.h> 153448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge#include <linux/list.h> 154448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge#include <linux/hash.h> 15587f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge#include <linux/sched.h> 1562222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk#include <linux/seq_file.h> 157b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 158b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge#include <asm/cache.h> 159b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge#include <asm/setup.h> 160b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 161b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge#include <asm/xen/page.h> 162b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge#include <asm/xen/hypercall.h> 163b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge#include <asm/xen/hypervisor.h> 164ee0726407feaf504dff304fb603652fb2d778b42Stefano Stabellini#include <xen/balloon.h> 1650930bba674e248b921ea659b036ff02564e5a5f4Stefano Stabellini#include <xen/grant_table.h> 166b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 1670930bba674e248b921ea659b036ff02564e5a5f4Stefano Stabellini#include "multicalls.h" 168b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge#include "xen-ops.h" 169b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 170448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardingestatic void __init m2p_override_init(void); 171448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge 172b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardingeunsigned long xen_max_p2m_pfn __read_mostly; 173b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 174b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge#define P2M_PER_PAGE (PAGE_SIZE / sizeof(unsigned long)) 175b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge#define P2M_MID_PER_PAGE (PAGE_SIZE / sizeof(unsigned long *)) 176b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge#define P2M_TOP_PER_PAGE (PAGE_SIZE / sizeof(unsigned long **)) 177b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 178b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge#define MAX_P2M_PFN (P2M_TOP_PER_PAGE * P2M_MID_PER_PAGE * P2M_PER_PAGE) 179b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 180b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge/* Placeholders for holes in the address space */ 181b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardingestatic RESERVE_BRK_ARRAY(unsigned long, p2m_missing, P2M_PER_PAGE); 182b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardingestatic RESERVE_BRK_ARRAY(unsigned long *, p2m_mid_missing, P2M_MID_PER_PAGE); 183b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardingestatic RESERVE_BRK_ARRAY(unsigned long, p2m_mid_missing_mfn, P2M_MID_PER_PAGE); 184b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 185b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardingestatic RESERVE_BRK_ARRAY(unsigned long **, p2m_top, P2M_TOP_PER_PAGE); 186b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardingestatic RESERVE_BRK_ARRAY(unsigned long, p2m_top_mfn, P2M_TOP_PER_PAGE); 187b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardingestatic RESERVE_BRK_ARRAY(unsigned long *, p2m_top_mfn_p, P2M_TOP_PER_PAGE); 188b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 189f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilkstatic RESERVE_BRK_ARRAY(unsigned long, p2m_identity, P2M_PER_PAGE); 190f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk 191b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy FitzhardingeRESERVE_BRK(p2m_mid, PAGE_SIZE * (MAX_DOMAIN_PAGES / (P2M_PER_PAGE * P2M_MID_PER_PAGE))); 192b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy FitzhardingeRESERVE_BRK(p2m_mid_mfn, PAGE_SIZE * (MAX_DOMAIN_PAGES / (P2M_PER_PAGE * P2M_MID_PER_PAGE))); 193b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 194f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk/* We might hit two boundary violations at the start and end, at max each 195f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * boundary violation will require three middle nodes. */ 196f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek WilkRESERVE_BRK(p2m_mid_identity, PAGE_SIZE * 2 * 3); 197f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk 1985bc6f9888db5739abfa0cae279b4b442e4db8049Konrad Rzeszutek Wilk/* When we populate back during bootup, the amount of pages can vary. The 1995bc6f9888db5739abfa0cae279b4b442e4db8049Konrad Rzeszutek Wilk * max we have is seen is 395979, but that does not mean it can't be more. 200250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk * Some machines can have 3GB I/O holes even. With early_can_reuse_p2m_middle 201250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk * it can re-use Xen provided mfn_list array, so we only need to allocate at 202250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk * most three P2M top nodes. */ 203250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek WilkRESERVE_BRK(p2m_populated, PAGE_SIZE * 3); 204250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk 205b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardingestatic inline unsigned p2m_top_index(unsigned long pfn) 206b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge{ 207b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge BUG_ON(pfn >= MAX_P2M_PFN); 208b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge return pfn / (P2M_MID_PER_PAGE * P2M_PER_PAGE); 209b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge} 210b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 211b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardingestatic inline unsigned p2m_mid_index(unsigned long pfn) 212b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge{ 213b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge return (pfn / P2M_PER_PAGE) % P2M_MID_PER_PAGE; 214b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge} 215b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 216b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardingestatic inline unsigned p2m_index(unsigned long pfn) 217b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge{ 218b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge return pfn % P2M_PER_PAGE; 219b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge} 220b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 221b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardingestatic void p2m_top_init(unsigned long ***top) 222b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge{ 223b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge unsigned i; 224b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 225b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge for (i = 0; i < P2M_TOP_PER_PAGE; i++) 226b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge top[i] = p2m_mid_missing; 227b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge} 228b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 229b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardingestatic void p2m_top_mfn_init(unsigned long *top) 230b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge{ 231b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge unsigned i; 232b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 233b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge for (i = 0; i < P2M_TOP_PER_PAGE; i++) 234b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge top[i] = virt_to_mfn(p2m_mid_missing_mfn); 235b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge} 236b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 237b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardingestatic void p2m_top_mfn_p_init(unsigned long **top) 238b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge{ 239b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge unsigned i; 240b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 241b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge for (i = 0; i < P2M_TOP_PER_PAGE; i++) 242b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge top[i] = p2m_mid_missing_mfn; 243b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge} 244b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 245b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardingestatic void p2m_mid_init(unsigned long **mid) 246b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge{ 247b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge unsigned i; 248b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 249b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge for (i = 0; i < P2M_MID_PER_PAGE; i++) 250b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge mid[i] = p2m_missing; 251b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge} 252b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 253b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardingestatic void p2m_mid_mfn_init(unsigned long *mid) 254b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge{ 255b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge unsigned i; 256b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 257b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge for (i = 0; i < P2M_MID_PER_PAGE; i++) 258b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge mid[i] = virt_to_mfn(p2m_missing); 259b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge} 260b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 261b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardingestatic void p2m_init(unsigned long *p2m) 262b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge{ 263b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge unsigned i; 264b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 265b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge for (i = 0; i < P2M_MID_PER_PAGE; i++) 266b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge p2m[i] = INVALID_P2M_ENTRY; 267b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge} 268b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 269b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge/* 270b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge * Build the parallel p2m_top_mfn and p2m_mid_mfn structures 271b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge * 272b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge * This is called both at boot time, and after resuming from suspend: 273b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge * - At boot time we're called very early, and must use extend_brk() 274b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge * to allocate memory. 275b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge * 276b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge * - After resume we're called from within stop_machine, but the mfn 277b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge * tree should alreay be completely allocated. 278b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge */ 27944b46c3ef805793ab3a7730dc71c72d0f258ea8eIan Campbellvoid __ref xen_build_mfn_list_list(void) 280b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge{ 281b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge unsigned long pfn; 282b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 283b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge /* Pre-initialize p2m_top_mfn to be completely missing */ 284b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge if (p2m_top_mfn == NULL) { 285b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge p2m_mid_missing_mfn = extend_brk(PAGE_SIZE, PAGE_SIZE); 286b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge p2m_mid_mfn_init(p2m_mid_missing_mfn); 287b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 288b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge p2m_top_mfn_p = extend_brk(PAGE_SIZE, PAGE_SIZE); 289b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge p2m_top_mfn_p_init(p2m_top_mfn_p); 290b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 291b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge p2m_top_mfn = extend_brk(PAGE_SIZE, PAGE_SIZE); 292b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge p2m_top_mfn_init(p2m_top_mfn); 293b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge } else { 294b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge /* Reinitialise, mfn's all change after migration */ 295b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge p2m_mid_mfn_init(p2m_mid_missing_mfn); 296b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge } 297b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 298b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge for (pfn = 0; pfn < xen_max_p2m_pfn; pfn += P2M_PER_PAGE) { 299b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge unsigned topidx = p2m_top_index(pfn); 300b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge unsigned mididx = p2m_mid_index(pfn); 301b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge unsigned long **mid; 302b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge unsigned long *mid_mfn_p; 303b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 304b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge mid = p2m_top[topidx]; 305b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge mid_mfn_p = p2m_top_mfn_p[topidx]; 306b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 307b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge /* Don't bother allocating any mfn mid levels if 308b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge * they're just missing, just update the stored mfn, 309b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge * since all could have changed over a migrate. 310b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge */ 311b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge if (mid == p2m_mid_missing) { 312b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge BUG_ON(mididx); 313b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge BUG_ON(mid_mfn_p != p2m_mid_missing_mfn); 314b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge p2m_top_mfn[topidx] = virt_to_mfn(p2m_mid_missing_mfn); 315b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge pfn += (P2M_MID_PER_PAGE - 1) * P2M_PER_PAGE; 316b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge continue; 317b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge } 318b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 319b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge if (mid_mfn_p == p2m_mid_missing_mfn) { 320b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge /* 321b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge * XXX boot-time only! We should never find 322b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge * missing parts of the mfn tree after 323b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge * runtime. extend_brk() will BUG if we call 324b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge * it too late. 325b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge */ 326b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge mid_mfn_p = extend_brk(PAGE_SIZE, PAGE_SIZE); 327b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge p2m_mid_mfn_init(mid_mfn_p); 328b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 329b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge p2m_top_mfn_p[topidx] = mid_mfn_p; 330b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge } 331b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 332b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge p2m_top_mfn[topidx] = virt_to_mfn(mid_mfn_p); 333b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge mid_mfn_p[mididx] = virt_to_mfn(mid[mididx]); 334b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge } 335b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge} 336b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 337b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardingevoid xen_setup_mfn_list_list(void) 338b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge{ 339b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge BUG_ON(HYPERVISOR_shared_info == &xen_dummy_shared_info); 340b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 341b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge HYPERVISOR_shared_info->arch.pfn_to_mfn_frame_list_list = 342b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge virt_to_mfn(p2m_top_mfn); 343b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge HYPERVISOR_shared_info->arch.max_pfn = xen_max_p2m_pfn; 344b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge} 345b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 346b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge/* Set up p2m_top to point to the domain-builder provided p2m pages */ 347b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardingevoid __init xen_build_dynamic_phys_to_machine(void) 348b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge{ 349b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge unsigned long *mfn_list = (unsigned long *)xen_start_info->mfn_list; 350b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge unsigned long max_pfn = min(MAX_DOMAIN_PAGES, xen_start_info->nr_pages); 351b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge unsigned long pfn; 352b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 353b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge xen_max_p2m_pfn = max_pfn; 354b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 355b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge p2m_missing = extend_brk(PAGE_SIZE, PAGE_SIZE); 356b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge p2m_init(p2m_missing); 357b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 358b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge p2m_mid_missing = extend_brk(PAGE_SIZE, PAGE_SIZE); 359b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge p2m_mid_init(p2m_mid_missing); 360b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 361b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge p2m_top = extend_brk(PAGE_SIZE, PAGE_SIZE); 362b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge p2m_top_init(p2m_top); 363b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 364f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk p2m_identity = extend_brk(PAGE_SIZE, PAGE_SIZE); 365f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk p2m_init(p2m_identity); 366f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk 367b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge /* 368b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge * The domain builder gives us a pre-constructed p2m array in 369b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge * mfn_list for all the pages initially given to us, so we just 370b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge * need to graft that into our tree structure. 371b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge */ 372b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge for (pfn = 0; pfn < max_pfn; pfn += P2M_PER_PAGE) { 373b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge unsigned topidx = p2m_top_index(pfn); 374b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge unsigned mididx = p2m_mid_index(pfn); 375b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 376b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge if (p2m_top[topidx] == p2m_mid_missing) { 377b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge unsigned long **mid = extend_brk(PAGE_SIZE, PAGE_SIZE); 378b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge p2m_mid_init(mid); 379b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 380b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge p2m_top[topidx] = mid; 381b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge } 382b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 3838e1b4cf2108488ccfb9a3e7ed7cd85a435e01d4bStefan Bader /* 3848e1b4cf2108488ccfb9a3e7ed7cd85a435e01d4bStefan Bader * As long as the mfn_list has enough entries to completely 3858e1b4cf2108488ccfb9a3e7ed7cd85a435e01d4bStefan Bader * fill a p2m page, pointing into the array is ok. But if 3868e1b4cf2108488ccfb9a3e7ed7cd85a435e01d4bStefan Bader * not the entries beyond the last pfn will be undefined. 3878e1b4cf2108488ccfb9a3e7ed7cd85a435e01d4bStefan Bader */ 3888e1b4cf2108488ccfb9a3e7ed7cd85a435e01d4bStefan Bader if (unlikely(pfn + P2M_PER_PAGE > max_pfn)) { 3898e1b4cf2108488ccfb9a3e7ed7cd85a435e01d4bStefan Bader unsigned long p2midx; 390cf04d120d9413de581437cf9a29f138ec1178f65Stefan Bader 391cf04d120d9413de581437cf9a29f138ec1178f65Stefan Bader p2midx = max_pfn % P2M_PER_PAGE; 392cf04d120d9413de581437cf9a29f138ec1178f65Stefan Bader for ( ; p2midx < P2M_PER_PAGE; p2midx++) 393cf04d120d9413de581437cf9a29f138ec1178f65Stefan Bader mfn_list[pfn + p2midx] = INVALID_P2M_ENTRY; 394cf04d120d9413de581437cf9a29f138ec1178f65Stefan Bader } 395cf04d120d9413de581437cf9a29f138ec1178f65Stefan Bader p2m_top[topidx][mididx] = &mfn_list[pfn]; 396b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge } 397448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge 398448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge m2p_override_init(); 399b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge} 400357a3cfb147ee8e97c6f9cdc51e9a33aa56f7d99Konrad Rzeszutek Wilk#ifdef CONFIG_X86_64 401357a3cfb147ee8e97c6f9cdc51e9a33aa56f7d99Konrad Rzeszutek Wilk#include <linux/bootmem.h> 402357a3cfb147ee8e97c6f9cdc51e9a33aa56f7d99Konrad Rzeszutek Wilkunsigned long __init xen_revector_p2m_tree(void) 403357a3cfb147ee8e97c6f9cdc51e9a33aa56f7d99Konrad Rzeszutek Wilk{ 404357a3cfb147ee8e97c6f9cdc51e9a33aa56f7d99Konrad Rzeszutek Wilk unsigned long va_start; 405357a3cfb147ee8e97c6f9cdc51e9a33aa56f7d99Konrad Rzeszutek Wilk unsigned long va_end; 406357a3cfb147ee8e97c6f9cdc51e9a33aa56f7d99Konrad Rzeszutek Wilk unsigned long pfn; 4073fc509fc0c590900568ef516a37101d88f3476f5Konrad Rzeszutek Wilk unsigned long pfn_free = 0; 408357a3cfb147ee8e97c6f9cdc51e9a33aa56f7d99Konrad Rzeszutek Wilk unsigned long *mfn_list = NULL; 409357a3cfb147ee8e97c6f9cdc51e9a33aa56f7d99Konrad Rzeszutek Wilk unsigned long size; 410357a3cfb147ee8e97c6f9cdc51e9a33aa56f7d99Konrad Rzeszutek Wilk 411357a3cfb147ee8e97c6f9cdc51e9a33aa56f7d99Konrad Rzeszutek Wilk va_start = xen_start_info->mfn_list; 412357a3cfb147ee8e97c6f9cdc51e9a33aa56f7d99Konrad Rzeszutek Wilk /*We copy in increments of P2M_PER_PAGE * sizeof(unsigned long), 413357a3cfb147ee8e97c6f9cdc51e9a33aa56f7d99Konrad Rzeszutek Wilk * so make sure it is rounded up to that */ 414357a3cfb147ee8e97c6f9cdc51e9a33aa56f7d99Konrad Rzeszutek Wilk size = PAGE_ALIGN(xen_start_info->nr_pages * sizeof(unsigned long)); 415357a3cfb147ee8e97c6f9cdc51e9a33aa56f7d99Konrad Rzeszutek Wilk va_end = va_start + size; 416357a3cfb147ee8e97c6f9cdc51e9a33aa56f7d99Konrad Rzeszutek Wilk 417357a3cfb147ee8e97c6f9cdc51e9a33aa56f7d99Konrad Rzeszutek Wilk /* If we were revectored already, don't do it again. */ 418357a3cfb147ee8e97c6f9cdc51e9a33aa56f7d99Konrad Rzeszutek Wilk if (va_start <= __START_KERNEL_map && va_start >= __PAGE_OFFSET) 419357a3cfb147ee8e97c6f9cdc51e9a33aa56f7d99Konrad Rzeszutek Wilk return 0; 420357a3cfb147ee8e97c6f9cdc51e9a33aa56f7d99Konrad Rzeszutek Wilk 421357a3cfb147ee8e97c6f9cdc51e9a33aa56f7d99Konrad Rzeszutek Wilk mfn_list = alloc_bootmem_align(size, PAGE_SIZE); 422357a3cfb147ee8e97c6f9cdc51e9a33aa56f7d99Konrad Rzeszutek Wilk if (!mfn_list) { 423357a3cfb147ee8e97c6f9cdc51e9a33aa56f7d99Konrad Rzeszutek Wilk pr_warn("Could not allocate space for a new P2M tree!\n"); 424357a3cfb147ee8e97c6f9cdc51e9a33aa56f7d99Konrad Rzeszutek Wilk return xen_start_info->mfn_list; 425357a3cfb147ee8e97c6f9cdc51e9a33aa56f7d99Konrad Rzeszutek Wilk } 426357a3cfb147ee8e97c6f9cdc51e9a33aa56f7d99Konrad Rzeszutek Wilk /* Fill it out with INVALID_P2M_ENTRY value */ 427357a3cfb147ee8e97c6f9cdc51e9a33aa56f7d99Konrad Rzeszutek Wilk memset(mfn_list, 0xFF, size); 428357a3cfb147ee8e97c6f9cdc51e9a33aa56f7d99Konrad Rzeszutek Wilk 429357a3cfb147ee8e97c6f9cdc51e9a33aa56f7d99Konrad Rzeszutek Wilk for (pfn = 0; pfn < ALIGN(MAX_DOMAIN_PAGES, P2M_PER_PAGE); pfn += P2M_PER_PAGE) { 430357a3cfb147ee8e97c6f9cdc51e9a33aa56f7d99Konrad Rzeszutek Wilk unsigned topidx = p2m_top_index(pfn); 431357a3cfb147ee8e97c6f9cdc51e9a33aa56f7d99Konrad Rzeszutek Wilk unsigned mididx; 432357a3cfb147ee8e97c6f9cdc51e9a33aa56f7d99Konrad Rzeszutek Wilk unsigned long *mid_p; 433357a3cfb147ee8e97c6f9cdc51e9a33aa56f7d99Konrad Rzeszutek Wilk 434357a3cfb147ee8e97c6f9cdc51e9a33aa56f7d99Konrad Rzeszutek Wilk if (!p2m_top[topidx]) 435357a3cfb147ee8e97c6f9cdc51e9a33aa56f7d99Konrad Rzeszutek Wilk continue; 436b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 437357a3cfb147ee8e97c6f9cdc51e9a33aa56f7d99Konrad Rzeszutek Wilk if (p2m_top[topidx] == p2m_mid_missing) 438357a3cfb147ee8e97c6f9cdc51e9a33aa56f7d99Konrad Rzeszutek Wilk continue; 439357a3cfb147ee8e97c6f9cdc51e9a33aa56f7d99Konrad Rzeszutek Wilk 440357a3cfb147ee8e97c6f9cdc51e9a33aa56f7d99Konrad Rzeszutek Wilk mididx = p2m_mid_index(pfn); 441357a3cfb147ee8e97c6f9cdc51e9a33aa56f7d99Konrad Rzeszutek Wilk mid_p = p2m_top[topidx][mididx]; 442357a3cfb147ee8e97c6f9cdc51e9a33aa56f7d99Konrad Rzeszutek Wilk if (!mid_p) 443357a3cfb147ee8e97c6f9cdc51e9a33aa56f7d99Konrad Rzeszutek Wilk continue; 444357a3cfb147ee8e97c6f9cdc51e9a33aa56f7d99Konrad Rzeszutek Wilk if ((mid_p == p2m_missing) || (mid_p == p2m_identity)) 445357a3cfb147ee8e97c6f9cdc51e9a33aa56f7d99Konrad Rzeszutek Wilk continue; 446b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 447357a3cfb147ee8e97c6f9cdc51e9a33aa56f7d99Konrad Rzeszutek Wilk if ((unsigned long)mid_p == INVALID_P2M_ENTRY) 448357a3cfb147ee8e97c6f9cdc51e9a33aa56f7d99Konrad Rzeszutek Wilk continue; 449357a3cfb147ee8e97c6f9cdc51e9a33aa56f7d99Konrad Rzeszutek Wilk 450357a3cfb147ee8e97c6f9cdc51e9a33aa56f7d99Konrad Rzeszutek Wilk /* The old va. Rebase it on mfn_list */ 451357a3cfb147ee8e97c6f9cdc51e9a33aa56f7d99Konrad Rzeszutek Wilk if (mid_p >= (unsigned long *)va_start && mid_p <= (unsigned long *)va_end) { 452357a3cfb147ee8e97c6f9cdc51e9a33aa56f7d99Konrad Rzeszutek Wilk unsigned long *new; 453357a3cfb147ee8e97c6f9cdc51e9a33aa56f7d99Konrad Rzeszutek Wilk 4543fc509fc0c590900568ef516a37101d88f3476f5Konrad Rzeszutek Wilk if (pfn_free > (size / sizeof(unsigned long))) { 4553fc509fc0c590900568ef516a37101d88f3476f5Konrad Rzeszutek Wilk WARN(1, "Only allocated for %ld pages, but we want %ld!\n", 4563fc509fc0c590900568ef516a37101d88f3476f5Konrad Rzeszutek Wilk size / sizeof(unsigned long), pfn_free); 4573fc509fc0c590900568ef516a37101d88f3476f5Konrad Rzeszutek Wilk return 0; 4583fc509fc0c590900568ef516a37101d88f3476f5Konrad Rzeszutek Wilk } 4593fc509fc0c590900568ef516a37101d88f3476f5Konrad Rzeszutek Wilk new = &mfn_list[pfn_free]; 460357a3cfb147ee8e97c6f9cdc51e9a33aa56f7d99Konrad Rzeszutek Wilk 461357a3cfb147ee8e97c6f9cdc51e9a33aa56f7d99Konrad Rzeszutek Wilk copy_page(new, mid_p); 4623fc509fc0c590900568ef516a37101d88f3476f5Konrad Rzeszutek Wilk p2m_top[topidx][mididx] = &mfn_list[pfn_free]; 4633fc509fc0c590900568ef516a37101d88f3476f5Konrad Rzeszutek Wilk p2m_top_mfn_p[topidx][mididx] = virt_to_mfn(&mfn_list[pfn_free]); 4643fc509fc0c590900568ef516a37101d88f3476f5Konrad Rzeszutek Wilk 4653fc509fc0c590900568ef516a37101d88f3476f5Konrad Rzeszutek Wilk pfn_free += P2M_PER_PAGE; 466357a3cfb147ee8e97c6f9cdc51e9a33aa56f7d99Konrad Rzeszutek Wilk 467357a3cfb147ee8e97c6f9cdc51e9a33aa56f7d99Konrad Rzeszutek Wilk } 468357a3cfb147ee8e97c6f9cdc51e9a33aa56f7d99Konrad Rzeszutek Wilk /* This should be the leafs allocated for identity from _brk. */ 469357a3cfb147ee8e97c6f9cdc51e9a33aa56f7d99Konrad Rzeszutek Wilk } 470357a3cfb147ee8e97c6f9cdc51e9a33aa56f7d99Konrad Rzeszutek Wilk return (unsigned long)mfn_list; 471357a3cfb147ee8e97c6f9cdc51e9a33aa56f7d99Konrad Rzeszutek Wilk 472357a3cfb147ee8e97c6f9cdc51e9a33aa56f7d99Konrad Rzeszutek Wilk} 473357a3cfb147ee8e97c6f9cdc51e9a33aa56f7d99Konrad Rzeszutek Wilk#else 474357a3cfb147ee8e97c6f9cdc51e9a33aa56f7d99Konrad Rzeszutek Wilkunsigned long __init xen_revector_p2m_tree(void) 475357a3cfb147ee8e97c6f9cdc51e9a33aa56f7d99Konrad Rzeszutek Wilk{ 476357a3cfb147ee8e97c6f9cdc51e9a33aa56f7d99Konrad Rzeszutek Wilk return 0; 477357a3cfb147ee8e97c6f9cdc51e9a33aa56f7d99Konrad Rzeszutek Wilk} 478357a3cfb147ee8e97c6f9cdc51e9a33aa56f7d99Konrad Rzeszutek Wilk#endif 479b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardingeunsigned long get_phys_to_machine(unsigned long pfn) 480b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge{ 481b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge unsigned topidx, mididx, idx; 482b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 483b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge if (unlikely(pfn >= MAX_P2M_PFN)) 484b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge return INVALID_P2M_ENTRY; 485b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 486b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge topidx = p2m_top_index(pfn); 487b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge mididx = p2m_mid_index(pfn); 488b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge idx = p2m_index(pfn); 489b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 490f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk /* 491f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * The INVALID_P2M_ENTRY is filled in both p2m_*identity 492f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * and in p2m_*missing, so returning the INVALID_P2M_ENTRY 493f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * would be wrong. 494f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk */ 495f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk if (p2m_top[topidx][mididx] == p2m_identity) 496f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk return IDENTITY_FRAME(pfn); 497f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk 498b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge return p2m_top[topidx][mididx][idx]; 499b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge} 500b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy FitzhardingeEXPORT_SYMBOL_GPL(get_phys_to_machine); 501b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 502b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardingestatic void *alloc_p2m_page(void) 503b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge{ 504b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge return (void *)__get_free_page(GFP_KERNEL | __GFP_REPEAT); 505b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge} 506b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 507b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardingestatic void free_p2m_page(void *p) 508b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge{ 509b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge free_page((unsigned long)p); 510b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge} 511b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 512a3118beb6a8cbe77ae3342125d920205871b0717Konrad Rzeszutek Wilk/* 513b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge * Fully allocate the p2m structure for a given pfn. We need to check 514b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge * that both the top and mid levels are allocated, and make sure the 515b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge * parallel mfn tree is kept in sync. We may race with other cpus, so 516b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge * the new pages are installed with cmpxchg; if we lose the race then 517b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge * simply free the page we allocated and use the one that's there. 518b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge */ 519b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardingestatic bool alloc_p2m(unsigned long pfn) 520b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge{ 521b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge unsigned topidx, mididx; 522b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge unsigned long ***top_p, **mid; 523b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge unsigned long *top_mfn_p, *mid_mfn; 524b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 525b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge topidx = p2m_top_index(pfn); 526b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge mididx = p2m_mid_index(pfn); 527b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 528b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge top_p = &p2m_top[topidx]; 529b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge mid = *top_p; 530b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 531b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge if (mid == p2m_mid_missing) { 532b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge /* Mid level is missing, allocate a new one */ 533b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge mid = alloc_p2m_page(); 534b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge if (!mid) 535b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge return false; 536b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 537b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge p2m_mid_init(mid); 538b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 539b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge if (cmpxchg(top_p, p2m_mid_missing, mid) != p2m_mid_missing) 540b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge free_p2m_page(mid); 541b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge } 542b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 543b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge top_mfn_p = &p2m_top_mfn[topidx]; 544b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge mid_mfn = p2m_top_mfn_p[topidx]; 545b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 546b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge BUG_ON(virt_to_mfn(mid_mfn) != *top_mfn_p); 547b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 548b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge if (mid_mfn == p2m_mid_missing_mfn) { 549b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge /* Separately check the mid mfn level */ 550b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge unsigned long missing_mfn; 551b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge unsigned long mid_mfn_mfn; 552b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 553b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge mid_mfn = alloc_p2m_page(); 554b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge if (!mid_mfn) 555b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge return false; 556b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 557b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge p2m_mid_mfn_init(mid_mfn); 558b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 559b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge missing_mfn = virt_to_mfn(p2m_mid_missing_mfn); 560b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge mid_mfn_mfn = virt_to_mfn(mid_mfn); 561b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge if (cmpxchg(top_mfn_p, missing_mfn, mid_mfn_mfn) != missing_mfn) 562b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge free_p2m_page(mid_mfn); 563b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge else 564b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge p2m_top_mfn_p[topidx] = mid_mfn; 565b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge } 566b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 567f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk if (p2m_top[topidx][mididx] == p2m_identity || 568f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk p2m_top[topidx][mididx] == p2m_missing) { 569b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge /* p2m leaf page is missing */ 570b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge unsigned long *p2m; 571f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk unsigned long *p2m_orig = p2m_top[topidx][mididx]; 572b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 573b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge p2m = alloc_p2m_page(); 574b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge if (!p2m) 575b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge return false; 576b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 577b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge p2m_init(p2m); 578b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 579f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk if (cmpxchg(&mid[mididx], p2m_orig, p2m) != p2m_orig) 580b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge free_p2m_page(p2m); 581b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge else 582b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge mid_mfn[mididx] = virt_to_mfn(p2m); 583b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge } 584b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 585b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge return true; 586b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge} 587b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 588cef4cca551d652b7f69c9d76337c5fae24e069dcKonrad Rzeszutek Wilkstatic bool __init early_alloc_p2m_middle(unsigned long pfn, bool check_boundary) 589f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk{ 590f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk unsigned topidx, mididx, idx; 591d5096850b47424fb0f1c6a75b8f7184f7169319aKonrad Rzeszutek Wilk unsigned long *p2m; 592d5096850b47424fb0f1c6a75b8f7184f7169319aKonrad Rzeszutek Wilk unsigned long *mid_mfn_p; 593f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk 594f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk topidx = p2m_top_index(pfn); 595f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk mididx = p2m_mid_index(pfn); 596f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk idx = p2m_index(pfn); 597f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk 598f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk /* Pfff.. No boundary cross-over, lets get out. */ 599cef4cca551d652b7f69c9d76337c5fae24e069dcKonrad Rzeszutek Wilk if (!idx && check_boundary) 600f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk return false; 601f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk 602f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk WARN(p2m_top[topidx][mididx] == p2m_identity, 603f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk "P2M[%d][%d] == IDENTITY, should be MISSING (or alloced)!\n", 604f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk topidx, mididx); 605f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk 606f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk /* 607f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * Could be done by xen_build_dynamic_phys_to_machine.. 608f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk */ 609f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk if (p2m_top[topidx][mididx] != p2m_missing) 610f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk return false; 611f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk 612f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk /* Boundary cross-over for the edges: */ 613d5096850b47424fb0f1c6a75b8f7184f7169319aKonrad Rzeszutek Wilk p2m = extend_brk(PAGE_SIZE, PAGE_SIZE); 614f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk 615d5096850b47424fb0f1c6a75b8f7184f7169319aKonrad Rzeszutek Wilk p2m_init(p2m); 616f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk 617d5096850b47424fb0f1c6a75b8f7184f7169319aKonrad Rzeszutek Wilk p2m_top[topidx][mididx] = p2m; 618f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk 619d5096850b47424fb0f1c6a75b8f7184f7169319aKonrad Rzeszutek Wilk /* For save/restore we need to MFN of the P2M saved */ 620cef4cca551d652b7f69c9d76337c5fae24e069dcKonrad Rzeszutek Wilk 621d5096850b47424fb0f1c6a75b8f7184f7169319aKonrad Rzeszutek Wilk mid_mfn_p = p2m_top_mfn_p[topidx]; 622d5096850b47424fb0f1c6a75b8f7184f7169319aKonrad Rzeszutek Wilk WARN(mid_mfn_p[mididx] != virt_to_mfn(p2m_missing), 623d5096850b47424fb0f1c6a75b8f7184f7169319aKonrad Rzeszutek Wilk "P2M_TOP_P[%d][%d] != MFN of p2m_missing!\n", 624d5096850b47424fb0f1c6a75b8f7184f7169319aKonrad Rzeszutek Wilk topidx, mididx); 625d5096850b47424fb0f1c6a75b8f7184f7169319aKonrad Rzeszutek Wilk mid_mfn_p[mididx] = virt_to_mfn(p2m); 6268c5950881c3b5e6e350e4b0438a8ccc513d90df9Konrad Rzeszutek Wilk 627d5096850b47424fb0f1c6a75b8f7184f7169319aKonrad Rzeszutek Wilk return true; 628f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk} 6293f3aaea29ff7ee2d43b430338427f30ba7f60ff9Konrad Rzeszutek Wilk 6303f3aaea29ff7ee2d43b430338427f30ba7f60ff9Konrad Rzeszutek Wilkstatic bool __init early_alloc_p2m(unsigned long pfn) 6313f3aaea29ff7ee2d43b430338427f30ba7f60ff9Konrad Rzeszutek Wilk{ 6323f3aaea29ff7ee2d43b430338427f30ba7f60ff9Konrad Rzeszutek Wilk unsigned topidx = p2m_top_index(pfn); 6333f3aaea29ff7ee2d43b430338427f30ba7f60ff9Konrad Rzeszutek Wilk unsigned long *mid_mfn_p; 6343f3aaea29ff7ee2d43b430338427f30ba7f60ff9Konrad Rzeszutek Wilk unsigned long **mid; 6353f3aaea29ff7ee2d43b430338427f30ba7f60ff9Konrad Rzeszutek Wilk 6363f3aaea29ff7ee2d43b430338427f30ba7f60ff9Konrad Rzeszutek Wilk mid = p2m_top[topidx]; 6373f3aaea29ff7ee2d43b430338427f30ba7f60ff9Konrad Rzeszutek Wilk mid_mfn_p = p2m_top_mfn_p[topidx]; 6383f3aaea29ff7ee2d43b430338427f30ba7f60ff9Konrad Rzeszutek Wilk if (mid == p2m_mid_missing) { 6393f3aaea29ff7ee2d43b430338427f30ba7f60ff9Konrad Rzeszutek Wilk mid = extend_brk(PAGE_SIZE, PAGE_SIZE); 6403f3aaea29ff7ee2d43b430338427f30ba7f60ff9Konrad Rzeszutek Wilk 6413f3aaea29ff7ee2d43b430338427f30ba7f60ff9Konrad Rzeszutek Wilk p2m_mid_init(mid); 6423f3aaea29ff7ee2d43b430338427f30ba7f60ff9Konrad Rzeszutek Wilk 6433f3aaea29ff7ee2d43b430338427f30ba7f60ff9Konrad Rzeszutek Wilk p2m_top[topidx] = mid; 6443f3aaea29ff7ee2d43b430338427f30ba7f60ff9Konrad Rzeszutek Wilk 6453f3aaea29ff7ee2d43b430338427f30ba7f60ff9Konrad Rzeszutek Wilk BUG_ON(mid_mfn_p != p2m_mid_missing_mfn); 6463f3aaea29ff7ee2d43b430338427f30ba7f60ff9Konrad Rzeszutek Wilk } 6473f3aaea29ff7ee2d43b430338427f30ba7f60ff9Konrad Rzeszutek Wilk /* And the save/restore P2M tables.. */ 6483f3aaea29ff7ee2d43b430338427f30ba7f60ff9Konrad Rzeszutek Wilk if (mid_mfn_p == p2m_mid_missing_mfn) { 6493f3aaea29ff7ee2d43b430338427f30ba7f60ff9Konrad Rzeszutek Wilk mid_mfn_p = extend_brk(PAGE_SIZE, PAGE_SIZE); 6503f3aaea29ff7ee2d43b430338427f30ba7f60ff9Konrad Rzeszutek Wilk p2m_mid_mfn_init(mid_mfn_p); 6513f3aaea29ff7ee2d43b430338427f30ba7f60ff9Konrad Rzeszutek Wilk 6523f3aaea29ff7ee2d43b430338427f30ba7f60ff9Konrad Rzeszutek Wilk p2m_top_mfn_p[topidx] = mid_mfn_p; 6533f3aaea29ff7ee2d43b430338427f30ba7f60ff9Konrad Rzeszutek Wilk p2m_top_mfn[topidx] = virt_to_mfn(mid_mfn_p); 6543f3aaea29ff7ee2d43b430338427f30ba7f60ff9Konrad Rzeszutek Wilk /* Note: we don't set mid_mfn_p[midix] here, 6553f3aaea29ff7ee2d43b430338427f30ba7f60ff9Konrad Rzeszutek Wilk * look in early_alloc_p2m_middle */ 6563f3aaea29ff7ee2d43b430338427f30ba7f60ff9Konrad Rzeszutek Wilk } 6573f3aaea29ff7ee2d43b430338427f30ba7f60ff9Konrad Rzeszutek Wilk return true; 6583f3aaea29ff7ee2d43b430338427f30ba7f60ff9Konrad Rzeszutek Wilk} 659250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk 660250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk/* 661250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk * Skim over the P2M tree looking at pages that are either filled with 662250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk * INVALID_P2M_ENTRY or with 1:1 PFNs. If found, re-use that page and 663250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk * replace the P2M leaf with a p2m_missing or p2m_identity. 664250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk * Stick the old page in the new P2M tree location. 665250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk */ 666250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilkbool __init early_can_reuse_p2m_middle(unsigned long set_pfn, unsigned long set_mfn) 667250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk{ 668250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk unsigned topidx; 669250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk unsigned mididx; 670250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk unsigned ident_pfns; 671250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk unsigned inv_pfns; 672250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk unsigned long *p2m; 673250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk unsigned long *mid_mfn_p; 674250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk unsigned idx; 675250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk unsigned long pfn; 676250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk 677250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk /* We only look when this entails a P2M middle layer */ 678250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk if (p2m_index(set_pfn)) 679250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk return false; 680250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk 68150e900417b8096939d12a46848f965e27a905e36Konrad Rzeszutek Wilk for (pfn = 0; pfn < MAX_DOMAIN_PAGES; pfn += P2M_PER_PAGE) { 682250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk topidx = p2m_top_index(pfn); 683250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk 684250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk if (!p2m_top[topidx]) 685250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk continue; 686250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk 687250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk if (p2m_top[topidx] == p2m_mid_missing) 688250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk continue; 689250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk 690250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk mididx = p2m_mid_index(pfn); 691250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk p2m = p2m_top[topidx][mididx]; 692250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk if (!p2m) 693250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk continue; 694250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk 695250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk if ((p2m == p2m_missing) || (p2m == p2m_identity)) 696250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk continue; 697250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk 698250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk if ((unsigned long)p2m == INVALID_P2M_ENTRY) 699250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk continue; 700250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk 701250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk ident_pfns = 0; 702250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk inv_pfns = 0; 703250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk for (idx = 0; idx < P2M_PER_PAGE; idx++) { 704250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk /* IDENTITY_PFNs are 1:1 */ 705250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk if (p2m[idx] == IDENTITY_FRAME(pfn + idx)) 706250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk ident_pfns++; 707250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk else if (p2m[idx] == INVALID_P2M_ENTRY) 708250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk inv_pfns++; 709250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk else 710250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk break; 711250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk } 712250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk if ((ident_pfns == P2M_PER_PAGE) || (inv_pfns == P2M_PER_PAGE)) 713250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk goto found; 714250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk } 715250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk return false; 716250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilkfound: 717250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk /* Found one, replace old with p2m_identity or p2m_missing */ 718250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk p2m_top[topidx][mididx] = (ident_pfns ? p2m_identity : p2m_missing); 719250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk /* And the other for save/restore.. */ 720250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk mid_mfn_p = p2m_top_mfn_p[topidx]; 721250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk /* NOTE: Even if it is a p2m_identity it should still be point to 722250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk * a page filled with INVALID_P2M_ENTRY entries. */ 723250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk mid_mfn_p[mididx] = virt_to_mfn(p2m_missing); 724250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk 725250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk /* Reset where we want to stick the old page in. */ 726250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk topidx = p2m_top_index(set_pfn); 727250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk mididx = p2m_mid_index(set_pfn); 728250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk 729250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk /* This shouldn't happen */ 730250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk if (WARN_ON(p2m_top[topidx] == p2m_mid_missing)) 731250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk early_alloc_p2m(set_pfn); 732250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk 733250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk if (WARN_ON(p2m_top[topidx][mididx] != p2m_missing)) 734250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk return false; 735250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk 736250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk p2m_init(p2m); 737250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk p2m_top[topidx][mididx] = p2m; 738250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk mid_mfn_p = p2m_top_mfn_p[topidx]; 739250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk mid_mfn_p[mididx] = virt_to_mfn(p2m); 740250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk 741250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk return true; 742250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk} 743940713bb2ce3033f468a220094a07250a2f69bddKonrad Rzeszutek Wilkbool __init early_set_phys_to_machine(unsigned long pfn, unsigned long mfn) 744940713bb2ce3033f468a220094a07250a2f69bddKonrad Rzeszutek Wilk{ 745940713bb2ce3033f468a220094a07250a2f69bddKonrad Rzeszutek Wilk if (unlikely(!__set_phys_to_machine(pfn, mfn))) { 746940713bb2ce3033f468a220094a07250a2f69bddKonrad Rzeszutek Wilk if (!early_alloc_p2m(pfn)) 747940713bb2ce3033f468a220094a07250a2f69bddKonrad Rzeszutek Wilk return false; 748940713bb2ce3033f468a220094a07250a2f69bddKonrad Rzeszutek Wilk 749250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk if (early_can_reuse_p2m_middle(pfn, mfn)) 750250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk return __set_phys_to_machine(pfn, mfn); 751250a41e0ecc433cdd553a364d0fc74c766425209Konrad Rzeszutek Wilk 752940713bb2ce3033f468a220094a07250a2f69bddKonrad Rzeszutek Wilk if (!early_alloc_p2m_middle(pfn, false /* boundary crossover OK!*/)) 753940713bb2ce3033f468a220094a07250a2f69bddKonrad Rzeszutek Wilk return false; 754940713bb2ce3033f468a220094a07250a2f69bddKonrad Rzeszutek Wilk 755940713bb2ce3033f468a220094a07250a2f69bddKonrad Rzeszutek Wilk if (!__set_phys_to_machine(pfn, mfn)) 756940713bb2ce3033f468a220094a07250a2f69bddKonrad Rzeszutek Wilk return false; 757940713bb2ce3033f468a220094a07250a2f69bddKonrad Rzeszutek Wilk } 758940713bb2ce3033f468a220094a07250a2f69bddKonrad Rzeszutek Wilk 759940713bb2ce3033f468a220094a07250a2f69bddKonrad Rzeszutek Wilk return true; 760940713bb2ce3033f468a220094a07250a2f69bddKonrad Rzeszutek Wilk} 761b83c6e55ac482f08984504d61382ecf05f0afe32Randy Dunlapunsigned long __init set_phys_range_identity(unsigned long pfn_s, 762f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk unsigned long pfn_e) 763f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk{ 764f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk unsigned long pfn; 765f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk 766f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk if (unlikely(pfn_s >= MAX_P2M_PFN || pfn_e >= MAX_P2M_PFN)) 767f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk return 0; 768f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk 769f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk if (unlikely(xen_feature(XENFEAT_auto_translated_physmap))) 770f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk return pfn_e - pfn_s; 771f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk 772f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk if (pfn_s > pfn_e) 773f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk return 0; 774f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk 775f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk for (pfn = (pfn_s & ~(P2M_MID_PER_PAGE * P2M_PER_PAGE - 1)); 776f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk pfn < ALIGN(pfn_e, (P2M_MID_PER_PAGE * P2M_PER_PAGE)); 777f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk pfn += P2M_MID_PER_PAGE * P2M_PER_PAGE) 778f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk { 7793f3aaea29ff7ee2d43b430338427f30ba7f60ff9Konrad Rzeszutek Wilk WARN_ON(!early_alloc_p2m(pfn)); 780f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk } 781f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk 782cef4cca551d652b7f69c9d76337c5fae24e069dcKonrad Rzeszutek Wilk early_alloc_p2m_middle(pfn_s, true); 783cef4cca551d652b7f69c9d76337c5fae24e069dcKonrad Rzeszutek Wilk early_alloc_p2m_middle(pfn_e, true); 784f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk 785f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk for (pfn = pfn_s; pfn < pfn_e; pfn++) 786f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk if (!__set_phys_to_machine(pfn, IDENTITY_FRAME(pfn))) 787f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk break; 788f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk 789f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk if (!WARN((pfn - pfn_s) != (pfn_e - pfn_s), 790f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk "Identity mapping failed. We are %ld short of 1-1 mappings!\n", 791f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk (pfn_e - pfn_s) - (pfn - pfn_s))) 792f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk printk(KERN_DEBUG "1-1 mapping on %lx->%lx\n", pfn_s, pfn); 793f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk 794f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk return pfn - pfn_s; 795f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk} 796f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk 797b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge/* Try to install p2m mapping; fail if intermediate bits missing */ 798b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardingebool __set_phys_to_machine(unsigned long pfn, unsigned long mfn) 799b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge{ 800b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge unsigned topidx, mididx, idx; 801b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 8026eaa412f2753d98566b777836a98c6e7f672a3bbKonrad Rzeszutek Wilk if (unlikely(xen_feature(XENFEAT_auto_translated_physmap))) { 8036eaa412f2753d98566b777836a98c6e7f672a3bbKonrad Rzeszutek Wilk BUG_ON(pfn != mfn && mfn != INVALID_P2M_ENTRY); 8046eaa412f2753d98566b777836a98c6e7f672a3bbKonrad Rzeszutek Wilk return true; 8056eaa412f2753d98566b777836a98c6e7f672a3bbKonrad Rzeszutek Wilk } 806b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge if (unlikely(pfn >= MAX_P2M_PFN)) { 807b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge BUG_ON(mfn != INVALID_P2M_ENTRY); 808b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge return true; 809b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge } 810b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 811b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge topidx = p2m_top_index(pfn); 812b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge mididx = p2m_mid_index(pfn); 813b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge idx = p2m_index(pfn); 814b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 815f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk /* For sparse holes were the p2m leaf has real PFN along with 816f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * PCI holes, stick in the PFN as the MFN value. 817f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk */ 818f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk if (mfn != INVALID_P2M_ENTRY && (mfn & IDENTITY_FRAME_BIT)) { 819f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk if (p2m_top[topidx][mididx] == p2m_identity) 820f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk return true; 821f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk 822f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk /* Swap over from MISSING to IDENTITY if needed. */ 823f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk if (p2m_top[topidx][mididx] == p2m_missing) { 824c7617798771ad588d585986d896197c04b737621Konrad Rzeszutek Wilk WARN_ON(cmpxchg(&p2m_top[topidx][mididx], p2m_missing, 825c7617798771ad588d585986d896197c04b737621Konrad Rzeszutek Wilk p2m_identity) != p2m_missing); 826f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk return true; 827f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk } 828f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk } 829f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk 830b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge if (p2m_top[topidx][mididx] == p2m_missing) 831b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge return mfn == INVALID_P2M_ENTRY; 832b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 833b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge p2m_top[topidx][mididx][idx] = mfn; 834b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 835b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge return true; 836b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge} 837b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 838b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardingebool set_phys_to_machine(unsigned long pfn, unsigned long mfn) 839b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge{ 840b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge if (unlikely(!__set_phys_to_machine(pfn, mfn))) { 841b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge if (!alloc_p2m(pfn)) 842b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge return false; 843b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 844b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge if (!__set_phys_to_machine(pfn, mfn)) 845b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge return false; 846b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge } 847b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 848b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge return true; 849b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge} 850448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge 851448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge#define M2P_OVERRIDE_HASH_SHIFT 10 852448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge#define M2P_OVERRIDE_HASH (1 << M2P_OVERRIDE_HASH_SHIFT) 853448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge 854448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardingestatic RESERVE_BRK_ARRAY(struct list_head, m2p_overrides, M2P_OVERRIDE_HASH); 855448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardingestatic DEFINE_SPINLOCK(m2p_override_lock); 856448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge 857448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardingestatic void __init m2p_override_init(void) 858448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge{ 859448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge unsigned i; 860448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge 861448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge m2p_overrides = extend_brk(sizeof(*m2p_overrides) * M2P_OVERRIDE_HASH, 862448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge sizeof(unsigned long)); 863448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge 864448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge for (i = 0; i < M2P_OVERRIDE_HASH; i++) 865448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge INIT_LIST_HEAD(&m2p_overrides[i]); 866448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge} 867448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge 868448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardingestatic unsigned long mfn_hash(unsigned long mfn) 869448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge{ 870448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge return hash_long(mfn, M2P_OVERRIDE_HASH_SHIFT); 871448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge} 872448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge 873448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge/* Add an MFN override for a particular page */ 8740930bba674e248b921ea659b036ff02564e5a5f4Stefano Stabelliniint m2p_add_override(unsigned long mfn, struct page *page, 8750930bba674e248b921ea659b036ff02564e5a5f4Stefano Stabellini struct gnttab_map_grant_ref *kmap_op) 876448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge{ 877448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge unsigned long flags; 87887f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge unsigned long pfn; 8796b08cfebd3bd346d8a2fd68a2265fc7736849802Ian Campbell unsigned long uninitialized_var(address); 88087f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge unsigned level; 88187f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge pte_t *ptep = NULL; 88287f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge 88387f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge pfn = page_to_pfn(page); 88487f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge if (!PageHighMem(page)) { 88587f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge address = (unsigned long)__va(pfn << PAGE_SHIFT); 88687f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge ptep = lookup_address(address, &level); 88787f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge if (WARN(ptep == NULL || level != PG_LEVEL_4K, 88887f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge "m2p_add_override: pfn %lx not mapped", pfn)) 88987f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge return -EINVAL; 89087f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge } 8910f4b49eaf25e661fbe63a5370b7781166b34d616Konrad Rzeszutek Wilk WARN_ON(PagePrivate(page)); 8920f4b49eaf25e661fbe63a5370b7781166b34d616Konrad Rzeszutek Wilk SetPagePrivate(page); 8930f4b49eaf25e661fbe63a5370b7781166b34d616Konrad Rzeszutek Wilk set_page_private(page, mfn); 8949b705f0e98c489b18ba22a6eab9d694b546c8552Stefano Stabellini page->index = pfn_to_mfn(pfn); 895448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge 896b254244d2682fe975630f176c25a4444cc4e088dDaniel De Graaf if (unlikely(!set_phys_to_machine(pfn, FOREIGN_FRAME(mfn)))) 897b254244d2682fe975630f176c25a4444cc4e088dDaniel De Graaf return -ENOMEM; 898b254244d2682fe975630f176c25a4444cc4e088dDaniel De Graaf 8990930bba674e248b921ea659b036ff02564e5a5f4Stefano Stabellini if (kmap_op != NULL) { 9000930bba674e248b921ea659b036ff02564e5a5f4Stefano Stabellini if (!PageHighMem(page)) { 9010930bba674e248b921ea659b036ff02564e5a5f4Stefano Stabellini struct multicall_space mcs = 9020930bba674e248b921ea659b036ff02564e5a5f4Stefano Stabellini xen_mc_entry(sizeof(*kmap_op)); 9030930bba674e248b921ea659b036ff02564e5a5f4Stefano Stabellini 9040930bba674e248b921ea659b036ff02564e5a5f4Stefano Stabellini MULTI_grant_table_op(mcs.mc, 9050930bba674e248b921ea659b036ff02564e5a5f4Stefano Stabellini GNTTABOP_map_grant_ref, kmap_op, 1); 9060930bba674e248b921ea659b036ff02564e5a5f4Stefano Stabellini 9070930bba674e248b921ea659b036ff02564e5a5f4Stefano Stabellini xen_mc_issue(PARAVIRT_LAZY_MMU); 9080930bba674e248b921ea659b036ff02564e5a5f4Stefano Stabellini } 9090930bba674e248b921ea659b036ff02564e5a5f4Stefano Stabellini } 910448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge spin_lock_irqsave(&m2p_override_lock, flags); 911448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge list_add(&page->lru, &m2p_overrides[mfn_hash(mfn)]); 912448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge spin_unlock_irqrestore(&m2p_override_lock, flags); 91387f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge 914b9e0d95c041ca2d7ad297ee37c2e9cfab67a188fStefano Stabellini /* p2m(m2p(mfn)) == mfn: the mfn is already present somewhere in 915b9e0d95c041ca2d7ad297ee37c2e9cfab67a188fStefano Stabellini * this domain. Set the FOREIGN_FRAME_BIT in the p2m for the other 916b9e0d95c041ca2d7ad297ee37c2e9cfab67a188fStefano Stabellini * pfn so that the following mfn_to_pfn(mfn) calls will return the 917b9e0d95c041ca2d7ad297ee37c2e9cfab67a188fStefano Stabellini * pfn from the m2p_override (the backend pfn) instead. 918b9e0d95c041ca2d7ad297ee37c2e9cfab67a188fStefano Stabellini * We need to do this because the pages shared by the frontend 919b9e0d95c041ca2d7ad297ee37c2e9cfab67a188fStefano Stabellini * (xen-blkfront) can be already locked (lock_page, called by 920b9e0d95c041ca2d7ad297ee37c2e9cfab67a188fStefano Stabellini * do_read_cache_page); when the userspace backend tries to use them 921b9e0d95c041ca2d7ad297ee37c2e9cfab67a188fStefano Stabellini * with direct_IO, mfn_to_pfn returns the pfn of the frontend, so 922b9e0d95c041ca2d7ad297ee37c2e9cfab67a188fStefano Stabellini * do_blockdev_direct_IO is going to try to lock the same pages 923b9e0d95c041ca2d7ad297ee37c2e9cfab67a188fStefano Stabellini * again resulting in a deadlock. 924b9e0d95c041ca2d7ad297ee37c2e9cfab67a188fStefano Stabellini * As a side effect get_user_pages_fast might not be safe on the 925b9e0d95c041ca2d7ad297ee37c2e9cfab67a188fStefano Stabellini * frontend pages while they are being shared with the backend, 926b9e0d95c041ca2d7ad297ee37c2e9cfab67a188fStefano Stabellini * because mfn_to_pfn (that ends up being called by GUPF) will 927b9e0d95c041ca2d7ad297ee37c2e9cfab67a188fStefano Stabellini * return the backend pfn rather than the frontend pfn. */ 9280160676bba69523e8b0ac83f306cce7d342ed7c8David Vrabel pfn = mfn_to_pfn_no_overrides(mfn); 9290160676bba69523e8b0ac83f306cce7d342ed7c8David Vrabel if (get_phys_to_machine(pfn) == mfn) 930b9e0d95c041ca2d7ad297ee37c2e9cfab67a188fStefano Stabellini set_phys_to_machine(pfn, FOREIGN_FRAME(mfn)); 931b9e0d95c041ca2d7ad297ee37c2e9cfab67a188fStefano Stabellini 93287f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge return 0; 933448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge} 9348a91707d0a1a49193e23cb2d243632f2289feb24Konrad Rzeszutek WilkEXPORT_SYMBOL_GPL(m2p_add_override); 9352fc136eecd0c647a6b13fcd00d0c41a1a28f35a5Stefano Stabelliniint m2p_remove_override(struct page *page, 9362fc136eecd0c647a6b13fcd00d0c41a1a28f35a5Stefano Stabellini struct gnttab_map_grant_ref *kmap_op) 937448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge{ 938448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge unsigned long flags; 9399b705f0e98c489b18ba22a6eab9d694b546c8552Stefano Stabellini unsigned long mfn; 9409b705f0e98c489b18ba22a6eab9d694b546c8552Stefano Stabellini unsigned long pfn; 9416b08cfebd3bd346d8a2fd68a2265fc7736849802Ian Campbell unsigned long uninitialized_var(address); 94287f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge unsigned level; 94387f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge pte_t *ptep = NULL; 9449b705f0e98c489b18ba22a6eab9d694b546c8552Stefano Stabellini 9459b705f0e98c489b18ba22a6eab9d694b546c8552Stefano Stabellini pfn = page_to_pfn(page); 9469b705f0e98c489b18ba22a6eab9d694b546c8552Stefano Stabellini mfn = get_phys_to_machine(pfn); 9479b705f0e98c489b18ba22a6eab9d694b546c8552Stefano Stabellini if (mfn == INVALID_P2M_ENTRY || !(mfn & FOREIGN_FRAME_BIT)) 94887f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge return -EINVAL; 94987f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge 95087f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge if (!PageHighMem(page)) { 95187f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge address = (unsigned long)__va(pfn << PAGE_SHIFT); 95287f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge ptep = lookup_address(address, &level); 95387f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge 95487f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge if (WARN(ptep == NULL || level != PG_LEVEL_4K, 95587f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge "m2p_remove_override: pfn %lx not mapped", pfn)) 95687f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge return -EINVAL; 95787f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge } 9589b705f0e98c489b18ba22a6eab9d694b546c8552Stefano Stabellini 959448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge spin_lock_irqsave(&m2p_override_lock, flags); 960448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge list_del(&page->lru); 961448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge spin_unlock_irqrestore(&m2p_override_lock, flags); 9620f4b49eaf25e661fbe63a5370b7781166b34d616Konrad Rzeszutek Wilk WARN_ON(!PagePrivate(page)); 9630f4b49eaf25e661fbe63a5370b7781166b34d616Konrad Rzeszutek Wilk ClearPagePrivate(page); 96487f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge 9652fc136eecd0c647a6b13fcd00d0c41a1a28f35a5Stefano Stabellini set_phys_to_machine(pfn, page->index); 9662fc136eecd0c647a6b13fcd00d0c41a1a28f35a5Stefano Stabellini if (kmap_op != NULL) { 9670930bba674e248b921ea659b036ff02564e5a5f4Stefano Stabellini if (!PageHighMem(page)) { 9680930bba674e248b921ea659b036ff02564e5a5f4Stefano Stabellini struct multicall_space mcs; 969ee0726407feaf504dff304fb603652fb2d778b42Stefano Stabellini struct gnttab_unmap_and_replace *unmap_op; 970ee0726407feaf504dff304fb603652fb2d778b42Stefano Stabellini struct page *scratch_page = get_balloon_scratch_page(); 971ee0726407feaf504dff304fb603652fb2d778b42Stefano Stabellini unsigned long scratch_page_address = (unsigned long) 972ee0726407feaf504dff304fb603652fb2d778b42Stefano Stabellini __va(page_to_pfn(scratch_page) << PAGE_SHIFT); 9730930bba674e248b921ea659b036ff02564e5a5f4Stefano Stabellini 9740930bba674e248b921ea659b036ff02564e5a5f4Stefano Stabellini /* 9750930bba674e248b921ea659b036ff02564e5a5f4Stefano Stabellini * It might be that we queued all the m2p grant table 9760930bba674e248b921ea659b036ff02564e5a5f4Stefano Stabellini * hypercalls in a multicall, then m2p_remove_override 9770930bba674e248b921ea659b036ff02564e5a5f4Stefano Stabellini * get called before the multicall has actually been 9780930bba674e248b921ea659b036ff02564e5a5f4Stefano Stabellini * issued. In this case handle is going to -1 because 9790930bba674e248b921ea659b036ff02564e5a5f4Stefano Stabellini * it hasn't been modified yet. 9800930bba674e248b921ea659b036ff02564e5a5f4Stefano Stabellini */ 9812fc136eecd0c647a6b13fcd00d0c41a1a28f35a5Stefano Stabellini if (kmap_op->handle == -1) 9820930bba674e248b921ea659b036ff02564e5a5f4Stefano Stabellini xen_mc_flush(); 9830930bba674e248b921ea659b036ff02564e5a5f4Stefano Stabellini /* 9842fc136eecd0c647a6b13fcd00d0c41a1a28f35a5Stefano Stabellini * Now if kmap_op->handle is negative it means that the 9850930bba674e248b921ea659b036ff02564e5a5f4Stefano Stabellini * hypercall actually returned an error. 9860930bba674e248b921ea659b036ff02564e5a5f4Stefano Stabellini */ 9872fc136eecd0c647a6b13fcd00d0c41a1a28f35a5Stefano Stabellini if (kmap_op->handle == GNTST_general_error) { 9880930bba674e248b921ea659b036ff02564e5a5f4Stefano Stabellini printk(KERN_WARNING "m2p_remove_override: " 9890930bba674e248b921ea659b036ff02564e5a5f4Stefano Stabellini "pfn %lx mfn %lx, failed to modify kernel mappings", 9900930bba674e248b921ea659b036ff02564e5a5f4Stefano Stabellini pfn, mfn); 991d7f8f48d1eb3186b1b80b2ed9a7adab191f753e9Boris Ostrovsky put_balloon_scratch_page(); 9920930bba674e248b921ea659b036ff02564e5a5f4Stefano Stabellini return -1; 9930930bba674e248b921ea659b036ff02564e5a5f4Stefano Stabellini } 9940930bba674e248b921ea659b036ff02564e5a5f4Stefano Stabellini 995d7f8f48d1eb3186b1b80b2ed9a7adab191f753e9Boris Ostrovsky xen_mc_batch(); 996d7f8f48d1eb3186b1b80b2ed9a7adab191f753e9Boris Ostrovsky 997d7f8f48d1eb3186b1b80b2ed9a7adab191f753e9Boris Ostrovsky mcs = __xen_mc_entry( 998ee0726407feaf504dff304fb603652fb2d778b42Stefano Stabellini sizeof(struct gnttab_unmap_and_replace)); 9990930bba674e248b921ea659b036ff02564e5a5f4Stefano Stabellini unmap_op = mcs.args; 10002fc136eecd0c647a6b13fcd00d0c41a1a28f35a5Stefano Stabellini unmap_op->host_addr = kmap_op->host_addr; 1001ee0726407feaf504dff304fb603652fb2d778b42Stefano Stabellini unmap_op->new_addr = scratch_page_address; 10022fc136eecd0c647a6b13fcd00d0c41a1a28f35a5Stefano Stabellini unmap_op->handle = kmap_op->handle; 10030930bba674e248b921ea659b036ff02564e5a5f4Stefano Stabellini 10040930bba674e248b921ea659b036ff02564e5a5f4Stefano Stabellini MULTI_grant_table_op(mcs.mc, 1005ee0726407feaf504dff304fb603652fb2d778b42Stefano Stabellini GNTTABOP_unmap_and_replace, unmap_op, 1); 10060930bba674e248b921ea659b036ff02564e5a5f4Stefano Stabellini 1007ee0726407feaf504dff304fb603652fb2d778b42Stefano Stabellini mcs = __xen_mc_entry(0); 1008ee0726407feaf504dff304fb603652fb2d778b42Stefano Stabellini MULTI_update_va_mapping(mcs.mc, scratch_page_address, 1009d7f8f48d1eb3186b1b80b2ed9a7adab191f753e9Boris Ostrovsky pfn_pte(page_to_pfn(scratch_page), 1010ee0726407feaf504dff304fb603652fb2d778b42Stefano Stabellini PAGE_KERNEL_RO), 0); 1011d7f8f48d1eb3186b1b80b2ed9a7adab191f753e9Boris Ostrovsky 1012ee0726407feaf504dff304fb603652fb2d778b42Stefano Stabellini xen_mc_issue(PARAVIRT_LAZY_MMU); 1013ee0726407feaf504dff304fb603652fb2d778b42Stefano Stabellini 10142fc136eecd0c647a6b13fcd00d0c41a1a28f35a5Stefano Stabellini kmap_op->host_addr = 0; 1015ee0726407feaf504dff304fb603652fb2d778b42Stefano Stabellini put_balloon_scratch_page(); 10160930bba674e248b921ea659b036ff02564e5a5f4Stefano Stabellini } 10172fc136eecd0c647a6b13fcd00d0c41a1a28f35a5Stefano Stabellini } 101887f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge 1019b9e0d95c041ca2d7ad297ee37c2e9cfab67a188fStefano Stabellini /* p2m(m2p(mfn)) == FOREIGN_FRAME(mfn): the mfn is already present 1020b9e0d95c041ca2d7ad297ee37c2e9cfab67a188fStefano Stabellini * somewhere in this domain, even before being added to the 1021b9e0d95c041ca2d7ad297ee37c2e9cfab67a188fStefano Stabellini * m2p_override (see comment above in m2p_add_override). 1022b9e0d95c041ca2d7ad297ee37c2e9cfab67a188fStefano Stabellini * If there are no other entries in the m2p_override corresponding 1023b9e0d95c041ca2d7ad297ee37c2e9cfab67a188fStefano Stabellini * to this mfn, then remove the FOREIGN_FRAME_BIT from the p2m for 1024b9e0d95c041ca2d7ad297ee37c2e9cfab67a188fStefano Stabellini * the original pfn (the one shared by the frontend): the backend 1025b9e0d95c041ca2d7ad297ee37c2e9cfab67a188fStefano Stabellini * cannot do any IO on this page anymore because it has been 1026b9e0d95c041ca2d7ad297ee37c2e9cfab67a188fStefano Stabellini * unshared. Removing the FOREIGN_FRAME_BIT from the p2m entry of 1027b9e0d95c041ca2d7ad297ee37c2e9cfab67a188fStefano Stabellini * the original pfn causes mfn_to_pfn(mfn) to return the frontend 1028b9e0d95c041ca2d7ad297ee37c2e9cfab67a188fStefano Stabellini * pfn again. */ 1029b9e0d95c041ca2d7ad297ee37c2e9cfab67a188fStefano Stabellini mfn &= ~FOREIGN_FRAME_BIT; 10300160676bba69523e8b0ac83f306cce7d342ed7c8David Vrabel pfn = mfn_to_pfn_no_overrides(mfn); 10310160676bba69523e8b0ac83f306cce7d342ed7c8David Vrabel if (get_phys_to_machine(pfn) == FOREIGN_FRAME(mfn) && 1032b9e0d95c041ca2d7ad297ee37c2e9cfab67a188fStefano Stabellini m2p_find_override(mfn) == NULL) 1033b9e0d95c041ca2d7ad297ee37c2e9cfab67a188fStefano Stabellini set_phys_to_machine(pfn, mfn); 1034b9e0d95c041ca2d7ad297ee37c2e9cfab67a188fStefano Stabellini 103587f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge return 0; 1036448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge} 10378a91707d0a1a49193e23cb2d243632f2289feb24Konrad Rzeszutek WilkEXPORT_SYMBOL_GPL(m2p_remove_override); 1038448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge 1039448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardingestruct page *m2p_find_override(unsigned long mfn) 1040448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge{ 1041448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge unsigned long flags; 1042448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge struct list_head *bucket = &m2p_overrides[mfn_hash(mfn)]; 1043448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge struct page *p, *ret; 1044448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge 1045448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge ret = NULL; 1046448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge 1047448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge spin_lock_irqsave(&m2p_override_lock, flags); 1048448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge 1049448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge list_for_each_entry(p, bucket, lru) { 10500f4b49eaf25e661fbe63a5370b7781166b34d616Konrad Rzeszutek Wilk if (page_private(p) == mfn) { 1051448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge ret = p; 1052448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge break; 1053448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge } 1054448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge } 1055448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge 1056448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge spin_unlock_irqrestore(&m2p_override_lock, flags); 1057448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge 1058448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge return ret; 1059448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge} 1060448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge 1061448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardingeunsigned long m2p_find_override_pfn(unsigned long mfn, unsigned long pfn) 1062448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge{ 1063448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge struct page *p = m2p_find_override(mfn); 1064448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge unsigned long ret = pfn; 1065448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge 1066448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge if (p) 1067448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge ret = page_to_pfn(p); 1068448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge 1069448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge return ret; 1070448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge} 1071e1b478e4ec4477520767d1a920433626263a2a6bKonrad Rzeszutek WilkEXPORT_SYMBOL_GPL(m2p_find_override_pfn); 10722222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk 10732222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk#ifdef CONFIG_XEN_DEBUG_FS 1074a867db10e89e12a3d97dedafdd411aa1527a6540Konrad Rzeszutek Wilk#include <linux/debugfs.h> 1075a867db10e89e12a3d97dedafdd411aa1527a6540Konrad Rzeszutek Wilk#include "debugfs.h" 1076a867db10e89e12a3d97dedafdd411aa1527a6540Konrad Rzeszutek Wilkstatic int p2m_dump_show(struct seq_file *m, void *v) 10772222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk{ 10782222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk static const char * const level_name[] = { "top", "middle", 10798404877ee1cfdbc872e153fd89022f9e47f6f5a3Konrad Rzeszutek Wilk "entry", "abnormal", "error"}; 10802222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk#define TYPE_IDENTITY 0 10812222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk#define TYPE_MISSING 1 10822222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk#define TYPE_PFN 2 10832222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk#define TYPE_UNKNOWN 3 1084a491dbef56f2aba42fb292067d4652d246627738Konrad Rzeszutek Wilk static const char * const type_name[] = { 1085a491dbef56f2aba42fb292067d4652d246627738Konrad Rzeszutek Wilk [TYPE_IDENTITY] = "identity", 1086a491dbef56f2aba42fb292067d4652d246627738Konrad Rzeszutek Wilk [TYPE_MISSING] = "missing", 1087a491dbef56f2aba42fb292067d4652d246627738Konrad Rzeszutek Wilk [TYPE_PFN] = "pfn", 1088a491dbef56f2aba42fb292067d4652d246627738Konrad Rzeszutek Wilk [TYPE_UNKNOWN] = "abnormal"}; 10892222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk unsigned long pfn, prev_pfn_type = 0, prev_pfn_level = 0; 10902222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk unsigned int uninitialized_var(prev_level); 10912222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk unsigned int uninitialized_var(prev_type); 10922222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk 10932222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk if (!p2m_top) 10942222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk return 0; 10952222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk 10962222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk for (pfn = 0; pfn < MAX_DOMAIN_PAGES; pfn++) { 10972222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk unsigned topidx = p2m_top_index(pfn); 10982222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk unsigned mididx = p2m_mid_index(pfn); 10992222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk unsigned idx = p2m_index(pfn); 11002222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk unsigned lvl, type; 11012222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk 11022222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk lvl = 4; 11032222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk type = TYPE_UNKNOWN; 11042222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk if (p2m_top[topidx] == p2m_mid_missing) { 11052222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk lvl = 0; type = TYPE_MISSING; 11062222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk } else if (p2m_top[topidx] == NULL) { 11072222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk lvl = 0; type = TYPE_UNKNOWN; 11082222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk } else if (p2m_top[topidx][mididx] == NULL) { 11092222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk lvl = 1; type = TYPE_UNKNOWN; 11102222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk } else if (p2m_top[topidx][mididx] == p2m_identity) { 11112222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk lvl = 1; type = TYPE_IDENTITY; 11122222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk } else if (p2m_top[topidx][mididx] == p2m_missing) { 11132222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk lvl = 1; type = TYPE_MISSING; 11142222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk } else if (p2m_top[topidx][mididx][idx] == 0) { 11152222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk lvl = 2; type = TYPE_UNKNOWN; 11162222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk } else if (p2m_top[topidx][mididx][idx] == IDENTITY_FRAME(pfn)) { 11172222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk lvl = 2; type = TYPE_IDENTITY; 11182222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk } else if (p2m_top[topidx][mididx][idx] == INVALID_P2M_ENTRY) { 11192222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk lvl = 2; type = TYPE_MISSING; 11202222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk } else if (p2m_top[topidx][mididx][idx] == pfn) { 11212222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk lvl = 2; type = TYPE_PFN; 11222222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk } else if (p2m_top[topidx][mididx][idx] != pfn) { 11232222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk lvl = 2; type = TYPE_PFN; 11242222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk } 11252222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk if (pfn == 0) { 11262222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk prev_level = lvl; 11272222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk prev_type = type; 11282222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk } 11292222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk if (pfn == MAX_DOMAIN_PAGES-1) { 11302222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk lvl = 3; 11312222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk type = TYPE_UNKNOWN; 11322222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk } 11332222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk if (prev_type != type) { 11342222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk seq_printf(m, " [0x%lx->0x%lx] %s\n", 11352222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk prev_pfn_type, pfn, type_name[prev_type]); 11362222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk prev_pfn_type = pfn; 11372222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk prev_type = type; 11382222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk } 11392222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk if (prev_level != lvl) { 11402222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk seq_printf(m, " [0x%lx->0x%lx] level %s\n", 11412222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk prev_pfn_level, pfn, level_name[prev_level]); 11422222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk prev_pfn_level = pfn; 11432222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk prev_level = lvl; 11442222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk } 11452222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk } 11462222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk return 0; 11472222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk#undef TYPE_IDENTITY 11482222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk#undef TYPE_MISSING 11492222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk#undef TYPE_PFN 11502222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk#undef TYPE_UNKNOWN 11512222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk} 1152a867db10e89e12a3d97dedafdd411aa1527a6540Konrad Rzeszutek Wilk 1153a867db10e89e12a3d97dedafdd411aa1527a6540Konrad Rzeszutek Wilkstatic int p2m_dump_open(struct inode *inode, struct file *filp) 1154a867db10e89e12a3d97dedafdd411aa1527a6540Konrad Rzeszutek Wilk{ 1155a867db10e89e12a3d97dedafdd411aa1527a6540Konrad Rzeszutek Wilk return single_open(filp, p2m_dump_show, NULL); 1156a867db10e89e12a3d97dedafdd411aa1527a6540Konrad Rzeszutek Wilk} 1157a867db10e89e12a3d97dedafdd411aa1527a6540Konrad Rzeszutek Wilk 1158a867db10e89e12a3d97dedafdd411aa1527a6540Konrad Rzeszutek Wilkstatic const struct file_operations p2m_dump_fops = { 1159a867db10e89e12a3d97dedafdd411aa1527a6540Konrad Rzeszutek Wilk .open = p2m_dump_open, 1160a867db10e89e12a3d97dedafdd411aa1527a6540Konrad Rzeszutek Wilk .read = seq_read, 1161a867db10e89e12a3d97dedafdd411aa1527a6540Konrad Rzeszutek Wilk .llseek = seq_lseek, 1162a867db10e89e12a3d97dedafdd411aa1527a6540Konrad Rzeszutek Wilk .release = single_release, 1163a867db10e89e12a3d97dedafdd411aa1527a6540Konrad Rzeszutek Wilk}; 1164a867db10e89e12a3d97dedafdd411aa1527a6540Konrad Rzeszutek Wilk 1165a867db10e89e12a3d97dedafdd411aa1527a6540Konrad Rzeszutek Wilkstatic struct dentry *d_mmu_debug; 1166a867db10e89e12a3d97dedafdd411aa1527a6540Konrad Rzeszutek Wilk 1167a867db10e89e12a3d97dedafdd411aa1527a6540Konrad Rzeszutek Wilkstatic int __init xen_p2m_debugfs(void) 1168a867db10e89e12a3d97dedafdd411aa1527a6540Konrad Rzeszutek Wilk{ 1169a867db10e89e12a3d97dedafdd411aa1527a6540Konrad Rzeszutek Wilk struct dentry *d_xen = xen_init_debugfs(); 1170a867db10e89e12a3d97dedafdd411aa1527a6540Konrad Rzeszutek Wilk 1171a867db10e89e12a3d97dedafdd411aa1527a6540Konrad Rzeszutek Wilk if (d_xen == NULL) 1172a867db10e89e12a3d97dedafdd411aa1527a6540Konrad Rzeszutek Wilk return -ENOMEM; 1173a867db10e89e12a3d97dedafdd411aa1527a6540Konrad Rzeszutek Wilk 1174a867db10e89e12a3d97dedafdd411aa1527a6540Konrad Rzeszutek Wilk d_mmu_debug = debugfs_create_dir("mmu", d_xen); 1175a867db10e89e12a3d97dedafdd411aa1527a6540Konrad Rzeszutek Wilk 1176a867db10e89e12a3d97dedafdd411aa1527a6540Konrad Rzeszutek Wilk debugfs_create_file("p2m", 0600, d_mmu_debug, NULL, &p2m_dump_fops); 1177a867db10e89e12a3d97dedafdd411aa1527a6540Konrad Rzeszutek Wilk return 0; 1178a867db10e89e12a3d97dedafdd411aa1527a6540Konrad Rzeszutek Wilk} 1179a867db10e89e12a3d97dedafdd411aa1527a6540Konrad Rzeszutek Wilkfs_initcall(xen_p2m_debugfs); 1180a867db10e89e12a3d97dedafdd411aa1527a6540Konrad Rzeszutek Wilk#endif /* CONFIG_XEN_DEBUG_FS */ 1181