p2m.c revision 8c5950881c3b5e6e350e4b0438a8ccc513d90df9
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 25b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge * 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 * | 142f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * p2m_missing p2m_missing 143f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * /------------------\ /------------\ 144f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * | [p2m_mid_missing]+---->| ~0, ~0, ~0 | 145f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * | [p2m_mid_missing]+---->| ..., ~0 | 146f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad 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> 164b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 165b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge#include "xen-ops.h" 166b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 167448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardingestatic void __init m2p_override_init(void); 168448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge 169b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardingeunsigned long xen_max_p2m_pfn __read_mostly; 170b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 171b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge#define P2M_PER_PAGE (PAGE_SIZE / sizeof(unsigned long)) 172b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge#define P2M_MID_PER_PAGE (PAGE_SIZE / sizeof(unsigned long *)) 173b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge#define P2M_TOP_PER_PAGE (PAGE_SIZE / sizeof(unsigned long **)) 174b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 175b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge#define MAX_P2M_PFN (P2M_TOP_PER_PAGE * P2M_MID_PER_PAGE * P2M_PER_PAGE) 176b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 177b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge/* Placeholders for holes in the address space */ 178b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardingestatic RESERVE_BRK_ARRAY(unsigned long, p2m_missing, P2M_PER_PAGE); 179b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardingestatic RESERVE_BRK_ARRAY(unsigned long *, p2m_mid_missing, P2M_MID_PER_PAGE); 180b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardingestatic RESERVE_BRK_ARRAY(unsigned long, p2m_mid_missing_mfn, P2M_MID_PER_PAGE); 181b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 182b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardingestatic RESERVE_BRK_ARRAY(unsigned long **, p2m_top, P2M_TOP_PER_PAGE); 183b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardingestatic RESERVE_BRK_ARRAY(unsigned long, p2m_top_mfn, P2M_TOP_PER_PAGE); 184b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardingestatic RESERVE_BRK_ARRAY(unsigned long *, p2m_top_mfn_p, P2M_TOP_PER_PAGE); 185b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 186f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilkstatic RESERVE_BRK_ARRAY(unsigned long, p2m_identity, P2M_PER_PAGE); 187f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk 188b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy FitzhardingeRESERVE_BRK(p2m_mid, PAGE_SIZE * (MAX_DOMAIN_PAGES / (P2M_PER_PAGE * P2M_MID_PER_PAGE))); 189b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy FitzhardingeRESERVE_BRK(p2m_mid_mfn, PAGE_SIZE * (MAX_DOMAIN_PAGES / (P2M_PER_PAGE * P2M_MID_PER_PAGE))); 190b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 191f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk/* We might hit two boundary violations at the start and end, at max each 192f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * boundary violation will require three middle nodes. */ 193f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek WilkRESERVE_BRK(p2m_mid_identity, PAGE_SIZE * 2 * 3); 194f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk 195b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardingestatic inline unsigned p2m_top_index(unsigned long pfn) 196b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge{ 197b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge BUG_ON(pfn >= MAX_P2M_PFN); 198b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge return pfn / (P2M_MID_PER_PAGE * P2M_PER_PAGE); 199b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge} 200b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 201b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardingestatic inline unsigned p2m_mid_index(unsigned long pfn) 202b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge{ 203b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge return (pfn / P2M_PER_PAGE) % P2M_MID_PER_PAGE; 204b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge} 205b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 206b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardingestatic inline unsigned p2m_index(unsigned long pfn) 207b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge{ 208b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge return pfn % P2M_PER_PAGE; 209b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge} 210b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 211b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardingestatic void p2m_top_init(unsigned long ***top) 212b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge{ 213b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge unsigned i; 214b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 215b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge for (i = 0; i < P2M_TOP_PER_PAGE; i++) 216b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge top[i] = p2m_mid_missing; 217b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge} 218b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 219b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardingestatic void p2m_top_mfn_init(unsigned long *top) 220b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge{ 221b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge unsigned i; 222b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 223b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge for (i = 0; i < P2M_TOP_PER_PAGE; i++) 224b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge top[i] = virt_to_mfn(p2m_mid_missing_mfn); 225b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge} 226b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 227b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardingestatic void p2m_top_mfn_p_init(unsigned long **top) 228b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge{ 229b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge unsigned i; 230b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 231b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge for (i = 0; i < P2M_TOP_PER_PAGE; i++) 232b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge top[i] = p2m_mid_missing_mfn; 233b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge} 234b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 235b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardingestatic void p2m_mid_init(unsigned long **mid) 236b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge{ 237b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge unsigned i; 238b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 239b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge for (i = 0; i < P2M_MID_PER_PAGE; i++) 240b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge mid[i] = p2m_missing; 241b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge} 242b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 243b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardingestatic void p2m_mid_mfn_init(unsigned long *mid) 244b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge{ 245b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge unsigned i; 246b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 247b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge for (i = 0; i < P2M_MID_PER_PAGE; i++) 248b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge mid[i] = virt_to_mfn(p2m_missing); 249b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge} 250b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 251b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardingestatic void p2m_init(unsigned long *p2m) 252b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge{ 253b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge unsigned i; 254b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 255b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge for (i = 0; i < P2M_MID_PER_PAGE; i++) 256b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge p2m[i] = INVALID_P2M_ENTRY; 257b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge} 258b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 259b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge/* 260b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge * Build the parallel p2m_top_mfn and p2m_mid_mfn structures 261b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge * 262b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge * This is called both at boot time, and after resuming from suspend: 263b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge * - At boot time we're called very early, and must use extend_brk() 264b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge * to allocate memory. 265b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge * 266b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge * - After resume we're called from within stop_machine, but the mfn 267b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge * tree should alreay be completely allocated. 268b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge */ 26944b46c3ef805793ab3a7730dc71c72d0f258ea8eIan Campbellvoid __ref xen_build_mfn_list_list(void) 270b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge{ 271b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge unsigned long pfn; 272b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 273b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge /* Pre-initialize p2m_top_mfn to be completely missing */ 274b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge if (p2m_top_mfn == NULL) { 275b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge p2m_mid_missing_mfn = extend_brk(PAGE_SIZE, PAGE_SIZE); 276b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge p2m_mid_mfn_init(p2m_mid_missing_mfn); 277b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 278b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge p2m_top_mfn_p = extend_brk(PAGE_SIZE, PAGE_SIZE); 279b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge p2m_top_mfn_p_init(p2m_top_mfn_p); 280b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 281b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge p2m_top_mfn = extend_brk(PAGE_SIZE, PAGE_SIZE); 282b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge p2m_top_mfn_init(p2m_top_mfn); 283b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge } else { 284b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge /* Reinitialise, mfn's all change after migration */ 285b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge p2m_mid_mfn_init(p2m_mid_missing_mfn); 286b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge } 287b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 288b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge for (pfn = 0; pfn < xen_max_p2m_pfn; pfn += P2M_PER_PAGE) { 289b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge unsigned topidx = p2m_top_index(pfn); 290b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge unsigned mididx = p2m_mid_index(pfn); 291b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge unsigned long **mid; 292b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge unsigned long *mid_mfn_p; 293b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 294b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge mid = p2m_top[topidx]; 295b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge mid_mfn_p = p2m_top_mfn_p[topidx]; 296b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 297b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge /* Don't bother allocating any mfn mid levels if 298b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge * they're just missing, just update the stored mfn, 299b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge * since all could have changed over a migrate. 300b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge */ 301b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge if (mid == p2m_mid_missing) { 302b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge BUG_ON(mididx); 303b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge BUG_ON(mid_mfn_p != p2m_mid_missing_mfn); 304b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge p2m_top_mfn[topidx] = virt_to_mfn(p2m_mid_missing_mfn); 305b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge pfn += (P2M_MID_PER_PAGE - 1) * P2M_PER_PAGE; 306b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge continue; 307b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge } 308b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 309b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge if (mid_mfn_p == p2m_mid_missing_mfn) { 310b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge /* 311b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge * XXX boot-time only! We should never find 312b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge * missing parts of the mfn tree after 313b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge * runtime. extend_brk() will BUG if we call 314b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge * it too late. 315b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge */ 316b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge mid_mfn_p = extend_brk(PAGE_SIZE, PAGE_SIZE); 317b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge p2m_mid_mfn_init(mid_mfn_p); 318b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 319b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge p2m_top_mfn_p[topidx] = mid_mfn_p; 320b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge } 321b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 322b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge p2m_top_mfn[topidx] = virt_to_mfn(mid_mfn_p); 323b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge mid_mfn_p[mididx] = virt_to_mfn(mid[mididx]); 324b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge } 325b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge} 326b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 327b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardingevoid xen_setup_mfn_list_list(void) 328b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge{ 329b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge BUG_ON(HYPERVISOR_shared_info == &xen_dummy_shared_info); 330b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 331b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge HYPERVISOR_shared_info->arch.pfn_to_mfn_frame_list_list = 332b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge virt_to_mfn(p2m_top_mfn); 333b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge HYPERVISOR_shared_info->arch.max_pfn = xen_max_p2m_pfn; 334b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge} 335b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 336b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge/* Set up p2m_top to point to the domain-builder provided p2m pages */ 337b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardingevoid __init xen_build_dynamic_phys_to_machine(void) 338b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge{ 339b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge unsigned long *mfn_list = (unsigned long *)xen_start_info->mfn_list; 340b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge unsigned long max_pfn = min(MAX_DOMAIN_PAGES, xen_start_info->nr_pages); 341b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge unsigned long pfn; 342b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 343b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge xen_max_p2m_pfn = max_pfn; 344b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 345b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge p2m_missing = extend_brk(PAGE_SIZE, PAGE_SIZE); 346b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge p2m_init(p2m_missing); 347b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 348b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge p2m_mid_missing = extend_brk(PAGE_SIZE, PAGE_SIZE); 349b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge p2m_mid_init(p2m_mid_missing); 350b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 351b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge p2m_top = extend_brk(PAGE_SIZE, PAGE_SIZE); 352b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge p2m_top_init(p2m_top); 353b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 354f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk p2m_identity = extend_brk(PAGE_SIZE, PAGE_SIZE); 355f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk p2m_init(p2m_identity); 356f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk 357b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge /* 358b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge * The domain builder gives us a pre-constructed p2m array in 359b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge * mfn_list for all the pages initially given to us, so we just 360b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge * need to graft that into our tree structure. 361b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge */ 362b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge for (pfn = 0; pfn < max_pfn; pfn += P2M_PER_PAGE) { 363b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge unsigned topidx = p2m_top_index(pfn); 364b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge unsigned mididx = p2m_mid_index(pfn); 365b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 366b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge if (p2m_top[topidx] == p2m_mid_missing) { 367b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge unsigned long **mid = extend_brk(PAGE_SIZE, PAGE_SIZE); 368b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge p2m_mid_init(mid); 369b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 370b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge p2m_top[topidx] = mid; 371b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge } 372b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 3738e1b4cf2108488ccfb9a3e7ed7cd85a435e01d4bStefan Bader /* 3748e1b4cf2108488ccfb9a3e7ed7cd85a435e01d4bStefan Bader * As long as the mfn_list has enough entries to completely 3758e1b4cf2108488ccfb9a3e7ed7cd85a435e01d4bStefan Bader * fill a p2m page, pointing into the array is ok. But if 3768e1b4cf2108488ccfb9a3e7ed7cd85a435e01d4bStefan Bader * not the entries beyond the last pfn will be undefined. 3778e1b4cf2108488ccfb9a3e7ed7cd85a435e01d4bStefan Bader */ 3788e1b4cf2108488ccfb9a3e7ed7cd85a435e01d4bStefan Bader if (unlikely(pfn + P2M_PER_PAGE > max_pfn)) { 3798e1b4cf2108488ccfb9a3e7ed7cd85a435e01d4bStefan Bader unsigned long p2midx; 380cf04d120d9413de581437cf9a29f138ec1178f65Stefan Bader 381cf04d120d9413de581437cf9a29f138ec1178f65Stefan Bader p2midx = max_pfn % P2M_PER_PAGE; 382cf04d120d9413de581437cf9a29f138ec1178f65Stefan Bader for ( ; p2midx < P2M_PER_PAGE; p2midx++) 383cf04d120d9413de581437cf9a29f138ec1178f65Stefan Bader mfn_list[pfn + p2midx] = INVALID_P2M_ENTRY; 384cf04d120d9413de581437cf9a29f138ec1178f65Stefan Bader } 385cf04d120d9413de581437cf9a29f138ec1178f65Stefan Bader p2m_top[topidx][mididx] = &mfn_list[pfn]; 386b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge } 387448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge 388448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge m2p_override_init(); 389b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge} 390b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 391b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardingeunsigned long get_phys_to_machine(unsigned long pfn) 392b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge{ 393b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge unsigned topidx, mididx, idx; 394b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 395b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge if (unlikely(pfn >= MAX_P2M_PFN)) 396b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge return INVALID_P2M_ENTRY; 397b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 398b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge topidx = p2m_top_index(pfn); 399b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge mididx = p2m_mid_index(pfn); 400b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge idx = p2m_index(pfn); 401b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 402f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk /* 403f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * The INVALID_P2M_ENTRY is filled in both p2m_*identity 404f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * and in p2m_*missing, so returning the INVALID_P2M_ENTRY 405f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * would be wrong. 406f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk */ 407f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk if (p2m_top[topidx][mididx] == p2m_identity) 408f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk return IDENTITY_FRAME(pfn); 409f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk 410b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge return p2m_top[topidx][mididx][idx]; 411b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge} 412b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy FitzhardingeEXPORT_SYMBOL_GPL(get_phys_to_machine); 413b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 414b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardingestatic void *alloc_p2m_page(void) 415b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge{ 416b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge return (void *)__get_free_page(GFP_KERNEL | __GFP_REPEAT); 417b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge} 418b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 419b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardingestatic void free_p2m_page(void *p) 420b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge{ 421b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge free_page((unsigned long)p); 422b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge} 423b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 424b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge/* 425b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge * Fully allocate the p2m structure for a given pfn. We need to check 426b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge * that both the top and mid levels are allocated, and make sure the 427b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge * parallel mfn tree is kept in sync. We may race with other cpus, so 428b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge * the new pages are installed with cmpxchg; if we lose the race then 429b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge * simply free the page we allocated and use the one that's there. 430b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge */ 431b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardingestatic bool alloc_p2m(unsigned long pfn) 432b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge{ 433b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge unsigned topidx, mididx; 434b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge unsigned long ***top_p, **mid; 435b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge unsigned long *top_mfn_p, *mid_mfn; 436b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 437b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge topidx = p2m_top_index(pfn); 438b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge mididx = p2m_mid_index(pfn); 439b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 440b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge top_p = &p2m_top[topidx]; 441b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge mid = *top_p; 442b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 443b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge if (mid == p2m_mid_missing) { 444b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge /* Mid level is missing, allocate a new one */ 445b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge mid = alloc_p2m_page(); 446b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge if (!mid) 447b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge return false; 448b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 449b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge p2m_mid_init(mid); 450b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 451b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge if (cmpxchg(top_p, p2m_mid_missing, mid) != p2m_mid_missing) 452b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge free_p2m_page(mid); 453b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge } 454b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 455b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge top_mfn_p = &p2m_top_mfn[topidx]; 456b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge mid_mfn = p2m_top_mfn_p[topidx]; 457b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 458b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge BUG_ON(virt_to_mfn(mid_mfn) != *top_mfn_p); 459b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 460b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge if (mid_mfn == p2m_mid_missing_mfn) { 461b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge /* Separately check the mid mfn level */ 462b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge unsigned long missing_mfn; 463b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge unsigned long mid_mfn_mfn; 464b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 465b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge mid_mfn = alloc_p2m_page(); 466b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge if (!mid_mfn) 467b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge return false; 468b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 469b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge p2m_mid_mfn_init(mid_mfn); 470b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 471b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge missing_mfn = virt_to_mfn(p2m_mid_missing_mfn); 472b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge mid_mfn_mfn = virt_to_mfn(mid_mfn); 473b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge if (cmpxchg(top_mfn_p, missing_mfn, mid_mfn_mfn) != missing_mfn) 474b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge free_p2m_page(mid_mfn); 475b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge else 476b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge p2m_top_mfn_p[topidx] = mid_mfn; 477b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge } 478b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 479f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk if (p2m_top[topidx][mididx] == p2m_identity || 480f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk p2m_top[topidx][mididx] == p2m_missing) { 481b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge /* p2m leaf page is missing */ 482b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge unsigned long *p2m; 483f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk unsigned long *p2m_orig = p2m_top[topidx][mididx]; 484b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 485b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge p2m = alloc_p2m_page(); 486b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge if (!p2m) 487b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge return false; 488b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 489b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge p2m_init(p2m); 490b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 491f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk if (cmpxchg(&mid[mididx], p2m_orig, p2m) != p2m_orig) 492b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge free_p2m_page(p2m); 493b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge else 494b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge mid_mfn[mididx] = virt_to_mfn(p2m); 495b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge } 496b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 497b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge return true; 498b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge} 499b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 500b83c6e55ac482f08984504d61382ecf05f0afe32Randy Dunlapstatic bool __init __early_alloc_p2m(unsigned long pfn) 501f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk{ 502f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk unsigned topidx, mididx, idx; 503f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk 504f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk topidx = p2m_top_index(pfn); 505f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk mididx = p2m_mid_index(pfn); 506f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk idx = p2m_index(pfn); 507f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk 508f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk /* Pfff.. No boundary cross-over, lets get out. */ 509f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk if (!idx) 510f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk return false; 511f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk 512f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk WARN(p2m_top[topidx][mididx] == p2m_identity, 513f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk "P2M[%d][%d] == IDENTITY, should be MISSING (or alloced)!\n", 514f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk topidx, mididx); 515f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk 516f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk /* 517f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * Could be done by xen_build_dynamic_phys_to_machine.. 518f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk */ 519f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk if (p2m_top[topidx][mididx] != p2m_missing) 520f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk return false; 521f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk 522f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk /* Boundary cross-over for the edges: */ 523f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk if (idx) { 524f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk unsigned long *p2m = extend_brk(PAGE_SIZE, PAGE_SIZE); 5258c5950881c3b5e6e350e4b0438a8ccc513d90df9Konrad Rzeszutek Wilk unsigned long *mid_mfn_p; 526f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk 527f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk p2m_init(p2m); 528f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk 529f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk p2m_top[topidx][mididx] = p2m; 530f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk 5318c5950881c3b5e6e350e4b0438a8ccc513d90df9Konrad Rzeszutek Wilk /* For save/restore we need to MFN of the P2M saved */ 5328c5950881c3b5e6e350e4b0438a8ccc513d90df9Konrad Rzeszutek Wilk 5338c5950881c3b5e6e350e4b0438a8ccc513d90df9Konrad Rzeszutek Wilk mid_mfn_p = p2m_top_mfn_p[topidx]; 5348c5950881c3b5e6e350e4b0438a8ccc513d90df9Konrad Rzeszutek Wilk WARN(mid_mfn_p[mididx] != virt_to_mfn(p2m_missing), 5358c5950881c3b5e6e350e4b0438a8ccc513d90df9Konrad Rzeszutek Wilk "P2M_TOP_P[%d][%d] != MFN of p2m_missing!\n", 5368c5950881c3b5e6e350e4b0438a8ccc513d90df9Konrad Rzeszutek Wilk topidx, mididx); 5378c5950881c3b5e6e350e4b0438a8ccc513d90df9Konrad Rzeszutek Wilk mid_mfn_p[mididx] = virt_to_mfn(p2m); 5388c5950881c3b5e6e350e4b0438a8ccc513d90df9Konrad Rzeszutek Wilk 539f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk } 540f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk return idx != 0; 541f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk} 542b83c6e55ac482f08984504d61382ecf05f0afe32Randy Dunlapunsigned long __init set_phys_range_identity(unsigned long pfn_s, 543f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk unsigned long pfn_e) 544f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk{ 545f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk unsigned long pfn; 546f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk 547f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk if (unlikely(pfn_s >= MAX_P2M_PFN || pfn_e >= MAX_P2M_PFN)) 548f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk return 0; 549f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk 550f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk if (unlikely(xen_feature(XENFEAT_auto_translated_physmap))) 551f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk return pfn_e - pfn_s; 552f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk 553f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk if (pfn_s > pfn_e) 554f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk return 0; 555f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk 556f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk for (pfn = (pfn_s & ~(P2M_MID_PER_PAGE * P2M_PER_PAGE - 1)); 557f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk pfn < ALIGN(pfn_e, (P2M_MID_PER_PAGE * P2M_PER_PAGE)); 558f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk pfn += P2M_MID_PER_PAGE * P2M_PER_PAGE) 559f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk { 560f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk unsigned topidx = p2m_top_index(pfn); 5618c5950881c3b5e6e350e4b0438a8ccc513d90df9Konrad Rzeszutek Wilk unsigned long *mid_mfn_p; 5628c5950881c3b5e6e350e4b0438a8ccc513d90df9Konrad Rzeszutek Wilk unsigned long **mid; 5638c5950881c3b5e6e350e4b0438a8ccc513d90df9Konrad Rzeszutek Wilk 5648c5950881c3b5e6e350e4b0438a8ccc513d90df9Konrad Rzeszutek Wilk mid = p2m_top[topidx]; 5658c5950881c3b5e6e350e4b0438a8ccc513d90df9Konrad Rzeszutek Wilk mid_mfn_p = p2m_top_mfn_p[topidx]; 5668c5950881c3b5e6e350e4b0438a8ccc513d90df9Konrad Rzeszutek Wilk if (mid == p2m_mid_missing) { 5678c5950881c3b5e6e350e4b0438a8ccc513d90df9Konrad Rzeszutek Wilk mid = extend_brk(PAGE_SIZE, PAGE_SIZE); 568f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk 569f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk p2m_mid_init(mid); 570f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk 571f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk p2m_top[topidx] = mid; 5728c5950881c3b5e6e350e4b0438a8ccc513d90df9Konrad Rzeszutek Wilk 5738c5950881c3b5e6e350e4b0438a8ccc513d90df9Konrad Rzeszutek Wilk BUG_ON(mid_mfn_p != p2m_mid_missing_mfn); 5748c5950881c3b5e6e350e4b0438a8ccc513d90df9Konrad Rzeszutek Wilk } 5758c5950881c3b5e6e350e4b0438a8ccc513d90df9Konrad Rzeszutek Wilk /* And the save/restore P2M tables.. */ 5768c5950881c3b5e6e350e4b0438a8ccc513d90df9Konrad Rzeszutek Wilk if (mid_mfn_p == p2m_mid_missing_mfn) { 5778c5950881c3b5e6e350e4b0438a8ccc513d90df9Konrad Rzeszutek Wilk mid_mfn_p = extend_brk(PAGE_SIZE, PAGE_SIZE); 5788c5950881c3b5e6e350e4b0438a8ccc513d90df9Konrad Rzeszutek Wilk p2m_mid_mfn_init(mid_mfn_p); 5798c5950881c3b5e6e350e4b0438a8ccc513d90df9Konrad Rzeszutek Wilk 5808c5950881c3b5e6e350e4b0438a8ccc513d90df9Konrad Rzeszutek Wilk p2m_top_mfn_p[topidx] = mid_mfn_p; 5818c5950881c3b5e6e350e4b0438a8ccc513d90df9Konrad Rzeszutek Wilk p2m_top_mfn[topidx] = virt_to_mfn(mid_mfn_p); 5828c5950881c3b5e6e350e4b0438a8ccc513d90df9Konrad Rzeszutek Wilk /* Note: we don't set mid_mfn_p[midix] here, 5838c5950881c3b5e6e350e4b0438a8ccc513d90df9Konrad Rzeszutek Wilk * look in __early_alloc_p2m */ 584f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk } 585f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk } 586f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk 587f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk __early_alloc_p2m(pfn_s); 588f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk __early_alloc_p2m(pfn_e); 589f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk 590f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk for (pfn = pfn_s; pfn < pfn_e; pfn++) 591f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk if (!__set_phys_to_machine(pfn, IDENTITY_FRAME(pfn))) 592f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk break; 593f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk 594f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk if (!WARN((pfn - pfn_s) != (pfn_e - pfn_s), 595f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk "Identity mapping failed. We are %ld short of 1-1 mappings!\n", 596f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk (pfn_e - pfn_s) - (pfn - pfn_s))) 597f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk printk(KERN_DEBUG "1-1 mapping on %lx->%lx\n", pfn_s, pfn); 598f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk 599f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk return pfn - pfn_s; 600f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk} 601f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk 602b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge/* Try to install p2m mapping; fail if intermediate bits missing */ 603b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardingebool __set_phys_to_machine(unsigned long pfn, unsigned long mfn) 604b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge{ 605b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge unsigned topidx, mididx, idx; 606b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 6076eaa412f2753d98566b777836a98c6e7f672a3bbKonrad Rzeszutek Wilk if (unlikely(xen_feature(XENFEAT_auto_translated_physmap))) { 6086eaa412f2753d98566b777836a98c6e7f672a3bbKonrad Rzeszutek Wilk BUG_ON(pfn != mfn && mfn != INVALID_P2M_ENTRY); 6096eaa412f2753d98566b777836a98c6e7f672a3bbKonrad Rzeszutek Wilk return true; 6106eaa412f2753d98566b777836a98c6e7f672a3bbKonrad Rzeszutek Wilk } 611b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge if (unlikely(pfn >= MAX_P2M_PFN)) { 612b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge BUG_ON(mfn != INVALID_P2M_ENTRY); 613b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge return true; 614b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge } 615b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 616b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge topidx = p2m_top_index(pfn); 617b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge mididx = p2m_mid_index(pfn); 618b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge idx = p2m_index(pfn); 619b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 620f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk /* For sparse holes were the p2m leaf has real PFN along with 621f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk * PCI holes, stick in the PFN as the MFN value. 622f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk */ 623f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk if (mfn != INVALID_P2M_ENTRY && (mfn & IDENTITY_FRAME_BIT)) { 624f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk if (p2m_top[topidx][mididx] == p2m_identity) 625f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk return true; 626f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk 627f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk /* Swap over from MISSING to IDENTITY if needed. */ 628f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk if (p2m_top[topidx][mididx] == p2m_missing) { 629c7617798771ad588d585986d896197c04b737621Konrad Rzeszutek Wilk WARN_ON(cmpxchg(&p2m_top[topidx][mididx], p2m_missing, 630c7617798771ad588d585986d896197c04b737621Konrad Rzeszutek Wilk p2m_identity) != p2m_missing); 631f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk return true; 632f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk } 633f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk } 634f4cec35b0d4b90d96e3770a3d1e68ea882e7a7c8Konrad Rzeszutek Wilk 635b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge if (p2m_top[topidx][mididx] == p2m_missing) 636b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge return mfn == INVALID_P2M_ENTRY; 637b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 638b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge p2m_top[topidx][mididx][idx] = mfn; 639b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 640b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge return true; 641b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge} 642b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 643b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardingebool set_phys_to_machine(unsigned long pfn, unsigned long mfn) 644b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge{ 645b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge if (unlikely(!__set_phys_to_machine(pfn, mfn))) { 646b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge if (!alloc_p2m(pfn)) 647b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge return false; 648b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 649b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge if (!__set_phys_to_machine(pfn, mfn)) 650b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge return false; 651b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge } 652b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge 653b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge return true; 654b5eafe924bb054d7c56e6ebd18106352e8a3f916Jeremy Fitzhardinge} 655448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge 656448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge#define M2P_OVERRIDE_HASH_SHIFT 10 657448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge#define M2P_OVERRIDE_HASH (1 << M2P_OVERRIDE_HASH_SHIFT) 658448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge 659448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardingestatic RESERVE_BRK_ARRAY(struct list_head, m2p_overrides, M2P_OVERRIDE_HASH); 660448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardingestatic DEFINE_SPINLOCK(m2p_override_lock); 661448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge 662448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardingestatic void __init m2p_override_init(void) 663448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge{ 664448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge unsigned i; 665448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge 666448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge m2p_overrides = extend_brk(sizeof(*m2p_overrides) * M2P_OVERRIDE_HASH, 667448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge sizeof(unsigned long)); 668448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge 669448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge for (i = 0; i < M2P_OVERRIDE_HASH; i++) 670448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge INIT_LIST_HEAD(&m2p_overrides[i]); 671448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge} 672448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge 673448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardingestatic unsigned long mfn_hash(unsigned long mfn) 674448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge{ 675448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge return hash_long(mfn, M2P_OVERRIDE_HASH_SHIFT); 676448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge} 677448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge 678448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge/* Add an MFN override for a particular page */ 67987f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardingeint m2p_add_override(unsigned long mfn, struct page *page) 680448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge{ 681448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge unsigned long flags; 68287f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge unsigned long pfn; 6836b08cfebd3bd346d8a2fd68a2265fc7736849802Ian Campbell unsigned long uninitialized_var(address); 68487f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge unsigned level; 68587f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge pte_t *ptep = NULL; 68687f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge 68787f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge pfn = page_to_pfn(page); 68887f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge if (!PageHighMem(page)) { 68987f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge address = (unsigned long)__va(pfn << PAGE_SHIFT); 69087f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge ptep = lookup_address(address, &level); 69187f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge 69287f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge if (WARN(ptep == NULL || level != PG_LEVEL_4K, 69387f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge "m2p_add_override: pfn %lx not mapped", pfn)) 69487f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge return -EINVAL; 69587f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge } 69687f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge 697448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge page->private = mfn; 6989b705f0e98c489b18ba22a6eab9d694b546c8552Stefano Stabellini page->index = pfn_to_mfn(pfn); 699448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge 700b254244d2682fe975630f176c25a4444cc4e088dDaniel De Graaf if (unlikely(!set_phys_to_machine(pfn, FOREIGN_FRAME(mfn)))) 701b254244d2682fe975630f176c25a4444cc4e088dDaniel De Graaf return -ENOMEM; 702b254244d2682fe975630f176c25a4444cc4e088dDaniel De Graaf 70387f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge if (!PageHighMem(page)) 70487f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge /* Just zap old mapping for now */ 70587f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge pte_clear(&init_mm, address, ptep); 70687f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge 707448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge spin_lock_irqsave(&m2p_override_lock, flags); 708448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge list_add(&page->lru, &m2p_overrides[mfn_hash(mfn)]); 709448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge spin_unlock_irqrestore(&m2p_override_lock, flags); 71087f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge 71187f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge return 0; 712448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge} 713448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge 71487f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardingeint m2p_remove_override(struct page *page) 715448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge{ 716448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge unsigned long flags; 7179b705f0e98c489b18ba22a6eab9d694b546c8552Stefano Stabellini unsigned long mfn; 7189b705f0e98c489b18ba22a6eab9d694b546c8552Stefano Stabellini unsigned long pfn; 7196b08cfebd3bd346d8a2fd68a2265fc7736849802Ian Campbell unsigned long uninitialized_var(address); 72087f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge unsigned level; 72187f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge pte_t *ptep = NULL; 7229b705f0e98c489b18ba22a6eab9d694b546c8552Stefano Stabellini 7239b705f0e98c489b18ba22a6eab9d694b546c8552Stefano Stabellini pfn = page_to_pfn(page); 7249b705f0e98c489b18ba22a6eab9d694b546c8552Stefano Stabellini mfn = get_phys_to_machine(pfn); 7259b705f0e98c489b18ba22a6eab9d694b546c8552Stefano Stabellini if (mfn == INVALID_P2M_ENTRY || !(mfn & FOREIGN_FRAME_BIT)) 72687f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge return -EINVAL; 72787f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge 72887f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge if (!PageHighMem(page)) { 72987f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge address = (unsigned long)__va(pfn << PAGE_SHIFT); 73087f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge ptep = lookup_address(address, &level); 73187f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge 73287f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge if (WARN(ptep == NULL || level != PG_LEVEL_4K, 73387f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge "m2p_remove_override: pfn %lx not mapped", pfn)) 73487f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge return -EINVAL; 73587f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge } 7369b705f0e98c489b18ba22a6eab9d694b546c8552Stefano Stabellini 737448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge spin_lock_irqsave(&m2p_override_lock, flags); 738448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge list_del(&page->lru); 739448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge spin_unlock_irqrestore(&m2p_override_lock, flags); 740b254244d2682fe975630f176c25a4444cc4e088dDaniel De Graaf set_phys_to_machine(pfn, page->index); 74187f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge 74287f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge if (!PageHighMem(page)) 74387f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge set_pte_at(&init_mm, address, ptep, 74487f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge pfn_pte(pfn, PAGE_KERNEL)); 74587f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge /* No tlb flush necessary because the caller already 74687f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge * left the pte unmapped. */ 74787f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge 74887f1d40a706bdebdc8f959b9ac291d0d8fdfcc7eJeremy Fitzhardinge return 0; 749448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge} 750448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge 751448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardingestruct page *m2p_find_override(unsigned long mfn) 752448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge{ 753448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge unsigned long flags; 754448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge struct list_head *bucket = &m2p_overrides[mfn_hash(mfn)]; 755448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge struct page *p, *ret; 756448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge 757448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge ret = NULL; 758448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge 759448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge spin_lock_irqsave(&m2p_override_lock, flags); 760448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge 761448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge list_for_each_entry(p, bucket, lru) { 762448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge if (p->private == mfn) { 763448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge ret = p; 764448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge break; 765448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge } 766448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge } 767448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge 768448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge spin_unlock_irqrestore(&m2p_override_lock, flags); 769448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge 770448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge return ret; 771448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge} 772448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge 773448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardingeunsigned long m2p_find_override_pfn(unsigned long mfn, unsigned long pfn) 774448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge{ 775448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge struct page *p = m2p_find_override(mfn); 776448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge unsigned long ret = pfn; 777448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge 778448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge if (p) 779448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge ret = page_to_pfn(p); 780448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge 781448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge return ret; 782448f2831934381e9d3c4d93e700ba7bbe14612dcJeremy Fitzhardinge} 783e1b478e4ec4477520767d1a920433626263a2a6bKonrad Rzeszutek WilkEXPORT_SYMBOL_GPL(m2p_find_override_pfn); 7842222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk 7852222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk#ifdef CONFIG_XEN_DEBUG_FS 7862222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk 7872222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilkint p2m_dump_show(struct seq_file *m, void *v) 7882222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk{ 7892222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk static const char * const level_name[] = { "top", "middle", 7902222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk "entry", "abnormal" }; 7912222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk static const char * const type_name[] = { "identity", "missing", 7922222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk "pfn", "abnormal"}; 7932222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk#define TYPE_IDENTITY 0 7942222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk#define TYPE_MISSING 1 7952222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk#define TYPE_PFN 2 7962222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk#define TYPE_UNKNOWN 3 7972222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk unsigned long pfn, prev_pfn_type = 0, prev_pfn_level = 0; 7982222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk unsigned int uninitialized_var(prev_level); 7992222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk unsigned int uninitialized_var(prev_type); 8002222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk 8012222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk if (!p2m_top) 8022222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk return 0; 8032222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk 8042222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk for (pfn = 0; pfn < MAX_DOMAIN_PAGES; pfn++) { 8052222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk unsigned topidx = p2m_top_index(pfn); 8062222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk unsigned mididx = p2m_mid_index(pfn); 8072222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk unsigned idx = p2m_index(pfn); 8082222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk unsigned lvl, type; 8092222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk 8102222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk lvl = 4; 8112222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk type = TYPE_UNKNOWN; 8122222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk if (p2m_top[topidx] == p2m_mid_missing) { 8132222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk lvl = 0; type = TYPE_MISSING; 8142222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk } else if (p2m_top[topidx] == NULL) { 8152222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk lvl = 0; type = TYPE_UNKNOWN; 8162222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk } else if (p2m_top[topidx][mididx] == NULL) { 8172222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk lvl = 1; type = TYPE_UNKNOWN; 8182222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk } else if (p2m_top[topidx][mididx] == p2m_identity) { 8192222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk lvl = 1; type = TYPE_IDENTITY; 8202222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk } else if (p2m_top[topidx][mididx] == p2m_missing) { 8212222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk lvl = 1; type = TYPE_MISSING; 8222222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk } else if (p2m_top[topidx][mididx][idx] == 0) { 8232222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk lvl = 2; type = TYPE_UNKNOWN; 8242222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk } else if (p2m_top[topidx][mididx][idx] == IDENTITY_FRAME(pfn)) { 8252222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk lvl = 2; type = TYPE_IDENTITY; 8262222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk } else if (p2m_top[topidx][mididx][idx] == INVALID_P2M_ENTRY) { 8272222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk lvl = 2; type = TYPE_MISSING; 8282222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk } else if (p2m_top[topidx][mididx][idx] == pfn) { 8292222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk lvl = 2; type = TYPE_PFN; 8302222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk } else if (p2m_top[topidx][mididx][idx] != pfn) { 8312222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk lvl = 2; type = TYPE_PFN; 8322222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk } 8332222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk if (pfn == 0) { 8342222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk prev_level = lvl; 8352222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk prev_type = type; 8362222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk } 8372222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk if (pfn == MAX_DOMAIN_PAGES-1) { 8382222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk lvl = 3; 8392222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk type = TYPE_UNKNOWN; 8402222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk } 8412222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk if (prev_type != type) { 8422222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk seq_printf(m, " [0x%lx->0x%lx] %s\n", 8432222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk prev_pfn_type, pfn, type_name[prev_type]); 8442222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk prev_pfn_type = pfn; 8452222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk prev_type = type; 8462222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk } 8472222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk if (prev_level != lvl) { 8482222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk seq_printf(m, " [0x%lx->0x%lx] level %s\n", 8492222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk prev_pfn_level, pfn, level_name[prev_level]); 8502222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk prev_pfn_level = pfn; 8512222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk prev_level = lvl; 8522222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk } 8532222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk } 8542222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk return 0; 8552222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk#undef TYPE_IDENTITY 8562222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk#undef TYPE_MISSING 8572222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk#undef TYPE_PFN 8582222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk#undef TYPE_UNKNOWN 8592222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk} 8602222e71bd6eff7b2ad026d4ee663b6327c5a49f5Konrad Rzeszutek Wilk#endif 861