hv.c revision b0209501dc7586cbfbf6d023f2dd3ce4621aff2c
13e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen/* 23e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen * Copyright (c) 2009, Microsoft Corporation. 33e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen * 43e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen * This program is free software; you can redistribute it and/or modify it 53e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen * under the terms and conditions of the GNU General Public License, 63e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen * version 2, as published by the Free Software Foundation. 73e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen * 83e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen * This program is distributed in the hope it will be useful, but WITHOUT 93e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 103e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 113e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen * more details. 123e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen * 133e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen * You should have received a copy of the GNU General Public License along with 143e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen * this program; if not, write to the Free Software Foundation, Inc., 59 Temple 153e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen * Place - Suite 330, Boston, MA 02111-1307 USA. 163e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen * 173e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen * Authors: 183e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen * Haiyang Zhang <haiyangz@microsoft.com> 193e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen * Hank Janssen <hjanssen@microsoft.com> 203e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen * 213e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen */ 220a46618d58c90f93e8b8e9a18062d1691b70297eHank Janssen#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 230a46618d58c90f93e8b8e9a18062d1691b70297eHank Janssen 24a0086dc512ba6c2161dcf48195daf177ad0c3615Greg Kroah-Hartman#include <linux/kernel.h> 25a0086dc512ba6c2161dcf48195daf177ad0c3615Greg Kroah-Hartman#include <linux/mm.h> 265a0e3ad6af8660be21ca98a971cd00f331318c05Tejun Heo#include <linux/slab.h> 27b7c947f04888b8bb2dc79832c10ede73c5b8dae2Bill Pemberton#include <linux/vmalloc.h> 2846a971913611a23478283931460a95be962ce329Greg Kroah-Hartman#include <linux/hyperv.h> 2983ba0c4f3f317270dae5597d8044b795d119914cK. Y. Srinivasan#include <linux/version.h> 30db11f12a11c9f04d504510e1cc20775209b0e509K. Y. Srinivasan#include <linux/interrupt.h> 31407dd1644302ea78fa5d740e67a1c09677aa18a4Greg Kroah-Hartman#include <asm/hyperv.h> 320f2a6619eeef158d11832436ce151987f18cb08dK. Y. Srinivasan#include "hyperv_vmbus.h" 333e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen 34454f18a963cf6519bf317e74e6b9781ffef8d253Bill Pemberton/* The one and only */ 356a0aaa185057801343e000183ef0695c2a2b75a9Haiyang Zhangstruct hv_context hv_context = { 366a0aaa185057801343e000183ef0695c2a2b75a9Haiyang Zhang .synic_initialized = false, 376a0aaa185057801343e000183ef0695c2a2b75a9Haiyang Zhang .hypercall_page = NULL, 383e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen}; 393e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen 403e18951955797872558dad615851a4ca63b2770eHank Janssen/* 41d44890c8d2a83116463c230b59b9b9d356aafe85Haiyang Zhang * query_hypervisor_info - Get version info of the windows hypervisor 420831ad041fd3611b31c10b46b9716b3c6289f1a1Greg Kroah-Hartman */ 43d44890c8d2a83116463c230b59b9b9d356aafe85Haiyang Zhangstatic int query_hypervisor_info(void) 440831ad041fd3611b31c10b46b9716b3c6289f1a1Greg Kroah-Hartman{ 450831ad041fd3611b31c10b46b9716b3c6289f1a1Greg Kroah-Hartman unsigned int eax; 460831ad041fd3611b31c10b46b9716b3c6289f1a1Greg Kroah-Hartman unsigned int ebx; 470831ad041fd3611b31c10b46b9716b3c6289f1a1Greg Kroah-Hartman unsigned int ecx; 480831ad041fd3611b31c10b46b9716b3c6289f1a1Greg Kroah-Hartman unsigned int edx; 49b8dfb264f4f9e55f9cf8384cb782dfe5159c413cHaiyang Zhang unsigned int max_leaf; 500831ad041fd3611b31c10b46b9716b3c6289f1a1Greg Kroah-Hartman unsigned int op; 513e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen 520831ad041fd3611b31c10b46b9716b3c6289f1a1Greg Kroah-Hartman /* 530831ad041fd3611b31c10b46b9716b3c6289f1a1Greg Kroah-Hartman * Its assumed that this is called after confirming that Viridian 540831ad041fd3611b31c10b46b9716b3c6289f1a1Greg Kroah-Hartman * is present. Query id and revision. 550831ad041fd3611b31c10b46b9716b3c6289f1a1Greg Kroah-Hartman */ 560831ad041fd3611b31c10b46b9716b3c6289f1a1Greg Kroah-Hartman eax = 0; 570831ad041fd3611b31c10b46b9716b3c6289f1a1Greg Kroah-Hartman ebx = 0; 580831ad041fd3611b31c10b46b9716b3c6289f1a1Greg Kroah-Hartman ecx = 0; 590831ad041fd3611b31c10b46b9716b3c6289f1a1Greg Kroah-Hartman edx = 0; 60f6feebe073db4c97dc10f6fab54f9d4b5816886bHaiyang Zhang op = HVCPUID_VENDOR_MAXFUNCTION; 610831ad041fd3611b31c10b46b9716b3c6289f1a1Greg Kroah-Hartman cpuid(op, &eax, &ebx, &ecx, &edx); 623e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen 63b8dfb264f4f9e55f9cf8384cb782dfe5159c413cHaiyang Zhang max_leaf = eax; 640831ad041fd3611b31c10b46b9716b3c6289f1a1Greg Kroah-Hartman 65b8dfb264f4f9e55f9cf8384cb782dfe5159c413cHaiyang Zhang if (max_leaf >= HVCPUID_VERSION) { 660831ad041fd3611b31c10b46b9716b3c6289f1a1Greg Kroah-Hartman eax = 0; 670831ad041fd3611b31c10b46b9716b3c6289f1a1Greg Kroah-Hartman ebx = 0; 680831ad041fd3611b31c10b46b9716b3c6289f1a1Greg Kroah-Hartman ecx = 0; 690831ad041fd3611b31c10b46b9716b3c6289f1a1Greg Kroah-Hartman edx = 0; 70f6feebe073db4c97dc10f6fab54f9d4b5816886bHaiyang Zhang op = HVCPUID_VERSION; 710831ad041fd3611b31c10b46b9716b3c6289f1a1Greg Kroah-Hartman cpuid(op, &eax, &ebx, &ecx, &edx); 720a46618d58c90f93e8b8e9a18062d1691b70297eHank Janssen pr_info("Hyper-V Host OS Build:%d-%d.%d-%d-%d.%d\n", 730831ad041fd3611b31c10b46b9716b3c6289f1a1Greg Kroah-Hartman eax, 740831ad041fd3611b31c10b46b9716b3c6289f1a1Greg Kroah-Hartman ebx >> 16, 750831ad041fd3611b31c10b46b9716b3c6289f1a1Greg Kroah-Hartman ebx & 0xFFFF, 760831ad041fd3611b31c10b46b9716b3c6289f1a1Greg Kroah-Hartman ecx, 770831ad041fd3611b31c10b46b9716b3c6289f1a1Greg Kroah-Hartman edx >> 24, 780831ad041fd3611b31c10b46b9716b3c6289f1a1Greg Kroah-Hartman edx & 0xFFFFFF); 790831ad041fd3611b31c10b46b9716b3c6289f1a1Greg Kroah-Hartman } 80b8dfb264f4f9e55f9cf8384cb782dfe5159c413cHaiyang Zhang return max_leaf; 810831ad041fd3611b31c10b46b9716b3c6289f1a1Greg Kroah-Hartman} 823e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen 833e18951955797872558dad615851a4ca63b2770eHank Janssen/* 84d44890c8d2a83116463c230b59b9b9d356aafe85Haiyang Zhang * do_hypercall- Invoke the specified hypercall 850831ad041fd3611b31c10b46b9716b3c6289f1a1Greg Kroah-Hartman */ 86d44890c8d2a83116463c230b59b9b9d356aafe85Haiyang Zhangstatic u64 do_hypercall(u64 control, void *input, void *output) 873e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen{ 88530cf2070be30831a371b6c7181d15e5976b6fc7Greg Kroah-Hartman#ifdef CONFIG_X86_64 89b8dfb264f4f9e55f9cf8384cb782dfe5159c413cHaiyang Zhang u64 hv_status = 0; 90b8dfb264f4f9e55f9cf8384cb782dfe5159c413cHaiyang Zhang u64 input_address = (input) ? virt_to_phys(input) : 0; 91b8dfb264f4f9e55f9cf8384cb782dfe5159c413cHaiyang Zhang u64 output_address = (output) ? virt_to_phys(output) : 0; 92dec317fd6accfdba4daff13aa4d9f5abde02b347K. Y. Srinivasan void *hypercall_page = hv_context.hypercall_page; 933e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen 94b8dfb264f4f9e55f9cf8384cb782dfe5159c413cHaiyang Zhang __asm__ __volatile__("mov %0, %%r8" : : "r" (output_address) : "r8"); 95b8dfb264f4f9e55f9cf8384cb782dfe5159c413cHaiyang Zhang __asm__ __volatile__("call *%3" : "=a" (hv_status) : 96b8dfb264f4f9e55f9cf8384cb782dfe5159c413cHaiyang Zhang "c" (control), "d" (input_address), 97b8dfb264f4f9e55f9cf8384cb782dfe5159c413cHaiyang Zhang "m" (hypercall_page)); 983e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen 99b8dfb264f4f9e55f9cf8384cb782dfe5159c413cHaiyang Zhang return hv_status; 1003e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen 1013e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen#else 1023e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen 103b8dfb264f4f9e55f9cf8384cb782dfe5159c413cHaiyang Zhang u32 control_hi = control >> 32; 104b8dfb264f4f9e55f9cf8384cb782dfe5159c413cHaiyang Zhang u32 control_lo = control & 0xFFFFFFFF; 105b8dfb264f4f9e55f9cf8384cb782dfe5159c413cHaiyang Zhang u32 hv_status_hi = 1; 106b8dfb264f4f9e55f9cf8384cb782dfe5159c413cHaiyang Zhang u32 hv_status_lo = 1; 107b8dfb264f4f9e55f9cf8384cb782dfe5159c413cHaiyang Zhang u64 input_address = (input) ? virt_to_phys(input) : 0; 108b8dfb264f4f9e55f9cf8384cb782dfe5159c413cHaiyang Zhang u32 input_address_hi = input_address >> 32; 109b8dfb264f4f9e55f9cf8384cb782dfe5159c413cHaiyang Zhang u32 input_address_lo = input_address & 0xFFFFFFFF; 110b8dfb264f4f9e55f9cf8384cb782dfe5159c413cHaiyang Zhang u64 output_address = (output) ? virt_to_phys(output) : 0; 111b8dfb264f4f9e55f9cf8384cb782dfe5159c413cHaiyang Zhang u32 output_address_hi = output_address >> 32; 112b8dfb264f4f9e55f9cf8384cb782dfe5159c413cHaiyang Zhang u32 output_address_lo = output_address & 0xFFFFFFFF; 113dec317fd6accfdba4daff13aa4d9f5abde02b347K. Y. Srinivasan void *hypercall_page = hv_context.hypercall_page; 1143e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen 115b8dfb264f4f9e55f9cf8384cb782dfe5159c413cHaiyang Zhang __asm__ __volatile__ ("call *%8" : "=d"(hv_status_hi), 116b8dfb264f4f9e55f9cf8384cb782dfe5159c413cHaiyang Zhang "=a"(hv_status_lo) : "d" (control_hi), 117b8dfb264f4f9e55f9cf8384cb782dfe5159c413cHaiyang Zhang "a" (control_lo), "b" (input_address_hi), 118b8dfb264f4f9e55f9cf8384cb782dfe5159c413cHaiyang Zhang "c" (input_address_lo), "D"(output_address_hi), 119b8dfb264f4f9e55f9cf8384cb782dfe5159c413cHaiyang Zhang "S"(output_address_lo), "m" (hypercall_page)); 1203e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen 121b8dfb264f4f9e55f9cf8384cb782dfe5159c413cHaiyang Zhang return hv_status_lo | ((u64)hv_status_hi << 32); 1220831ad041fd3611b31c10b46b9716b3c6289f1a1Greg Kroah-Hartman#endif /* !x86_64 */ 1233e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen} 1243e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen 1253e18951955797872558dad615851a4ca63b2770eHank Janssen/* 126d44890c8d2a83116463c230b59b9b9d356aafe85Haiyang Zhang * hv_init - Main initialization routine. 1270831ad041fd3611b31c10b46b9716b3c6289f1a1Greg Kroah-Hartman * 1280831ad041fd3611b31c10b46b9716b3c6289f1a1Greg Kroah-Hartman * This routine must be called before any other routines in here are called 1290831ad041fd3611b31c10b46b9716b3c6289f1a1Greg Kroah-Hartman */ 130d44890c8d2a83116463c230b59b9b9d356aafe85Haiyang Zhangint hv_init(void) 1313e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen{ 132b8dfb264f4f9e55f9cf8384cb782dfe5159c413cHaiyang Zhang int max_leaf; 133b8dfb264f4f9e55f9cf8384cb782dfe5159c413cHaiyang Zhang union hv_x64_msr_hypercall_contents hypercall_msr; 134b8dfb264f4f9e55f9cf8384cb782dfe5159c413cHaiyang Zhang void *virtaddr = NULL; 1353e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen 13614c1bf8a8920f36f6e0603a2ff920b48eec14387K. Y. Srinivasan memset(hv_context.synic_event_page, 0, sizeof(void *) * NR_CPUS); 1376a0aaa185057801343e000183ef0695c2a2b75a9Haiyang Zhang memset(hv_context.synic_message_page, 0, 13814c1bf8a8920f36f6e0603a2ff920b48eec14387K. Y. Srinivasan sizeof(void *) * NR_CPUS); 139917ea427c78670958488f7f304e4629c325969a4K. Y. Srinivasan memset(hv_context.vp_index, 0, 140917ea427c78670958488f7f304e4629c325969a4K. Y. Srinivasan sizeof(int) * NR_CPUS); 141db11f12a11c9f04d504510e1cc20775209b0e509K. Y. Srinivasan memset(hv_context.event_dpc, 0, 142db11f12a11c9f04d504510e1cc20775209b0e509K. Y. Srinivasan sizeof(void *) * NR_CPUS); 1433e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen 144d44890c8d2a83116463c230b59b9b9d356aafe85Haiyang Zhang max_leaf = query_hypervisor_info(); 1453e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen 14683ba0c4f3f317270dae5597d8044b795d119914cK. Y. Srinivasan /* 14783ba0c4f3f317270dae5597d8044b795d119914cK. Y. Srinivasan * Write our OS ID. 14883ba0c4f3f317270dae5597d8044b795d119914cK. Y. Srinivasan */ 14983ba0c4f3f317270dae5597d8044b795d119914cK. Y. Srinivasan hv_context.guestid = generate_guest_id(0, LINUX_VERSION_CODE, 0); 15083ba0c4f3f317270dae5597d8044b795d119914cK. Y. Srinivasan wrmsrl(HV_X64_MSR_GUEST_OS_ID, hv_context.guestid); 151a73e6b7c508f610eeb315c443d9ac79041124af0Hank Janssen 152454f18a963cf6519bf317e74e6b9781ffef8d253Bill Pemberton /* See if the hypercall page is already set */ 153b8dfb264f4f9e55f9cf8384cb782dfe5159c413cHaiyang Zhang rdmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64); 1543e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen 155df3493e0b3ba72f9b6192a91b24197cac41ce557K. Y. Srinivasan virtaddr = __vmalloc(PAGE_SIZE, GFP_KERNEL, PAGE_KERNEL_EXEC); 1563e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen 15798e087022b611c6f748c74d952193ccf69280f52Hank Janssen if (!virtaddr) 15844939d37cc03af996d93b9d15385ac13de2bd627K. Y. Srinivasan goto cleanup; 1593e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen 160b8dfb264f4f9e55f9cf8384cb782dfe5159c413cHaiyang Zhang hypercall_msr.enable = 1; 161a73e6b7c508f610eeb315c443d9ac79041124af0Hank Janssen 162b8dfb264f4f9e55f9cf8384cb782dfe5159c413cHaiyang Zhang hypercall_msr.guest_physical_address = vmalloc_to_pfn(virtaddr); 163b8dfb264f4f9e55f9cf8384cb782dfe5159c413cHaiyang Zhang wrmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64); 164a73e6b7c508f610eeb315c443d9ac79041124af0Hank Janssen 165a73e6b7c508f610eeb315c443d9ac79041124af0Hank Janssen /* Confirm that hypercall page did get setup. */ 166b8dfb264f4f9e55f9cf8384cb782dfe5159c413cHaiyang Zhang hypercall_msr.as_uint64 = 0; 167b8dfb264f4f9e55f9cf8384cb782dfe5159c413cHaiyang Zhang rdmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64); 168a73e6b7c508f610eeb315c443d9ac79041124af0Hank Janssen 16998e087022b611c6f748c74d952193ccf69280f52Hank Janssen if (!hypercall_msr.enable) 17044939d37cc03af996d93b9d15385ac13de2bd627K. Y. Srinivasan goto cleanup; 1713e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen 172b8dfb264f4f9e55f9cf8384cb782dfe5159c413cHaiyang Zhang hv_context.hypercall_page = virtaddr; 173a73e6b7c508f610eeb315c443d9ac79041124af0Hank Janssen 1745433e00334d3e20f8bff70845c7f44e00cdf2d14K. Y. Srinivasan return 0; 1753e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen 17644939d37cc03af996d93b9d15385ac13de2bd627K. Y. Srinivasancleanup: 177b8dfb264f4f9e55f9cf8384cb782dfe5159c413cHaiyang Zhang if (virtaddr) { 178b8dfb264f4f9e55f9cf8384cb782dfe5159c413cHaiyang Zhang if (hypercall_msr.enable) { 179b8dfb264f4f9e55f9cf8384cb782dfe5159c413cHaiyang Zhang hypercall_msr.as_uint64 = 0; 180b8dfb264f4f9e55f9cf8384cb782dfe5159c413cHaiyang Zhang wrmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64); 1813e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen } 1823e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen 183b8dfb264f4f9e55f9cf8384cb782dfe5159c413cHaiyang Zhang vfree(virtaddr); 1843e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen } 1855433e00334d3e20f8bff70845c7f44e00cdf2d14K. Y. Srinivasan 1865433e00334d3e20f8bff70845c7f44e00cdf2d14K. Y. Srinivasan return -ENOTSUPP; 1873e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen} 1883e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen 1893e18951955797872558dad615851a4ca63b2770eHank Janssen/* 190d44890c8d2a83116463c230b59b9b9d356aafe85Haiyang Zhang * hv_cleanup - Cleanup routine. 1910831ad041fd3611b31c10b46b9716b3c6289f1a1Greg Kroah-Hartman * 1920831ad041fd3611b31c10b46b9716b3c6289f1a1Greg Kroah-Hartman * This routine is called normally during driver unloading or exiting. 1930831ad041fd3611b31c10b46b9716b3c6289f1a1Greg Kroah-Hartman */ 194d44890c8d2a83116463c230b59b9b9d356aafe85Haiyang Zhangvoid hv_cleanup(void) 1953e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen{ 196b8dfb264f4f9e55f9cf8384cb782dfe5159c413cHaiyang Zhang union hv_x64_msr_hypercall_contents hypercall_msr; 1973e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen 19893e5bd06a95343c701361fa009cdc5a653d6ec8eK. Y. Srinivasan /* Reset our OS id */ 19993e5bd06a95343c701361fa009cdc5a653d6ec8eK. Y. Srinivasan wrmsrl(HV_X64_MSR_GUEST_OS_ID, 0); 20093e5bd06a95343c701361fa009cdc5a653d6ec8eK. Y. Srinivasan 2016a0aaa185057801343e000183ef0695c2a2b75a9Haiyang Zhang if (hv_context.hypercall_page) { 202b8dfb264f4f9e55f9cf8384cb782dfe5159c413cHaiyang Zhang hypercall_msr.as_uint64 = 0; 203b8dfb264f4f9e55f9cf8384cb782dfe5159c413cHaiyang Zhang wrmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64); 2046a0aaa185057801343e000183ef0695c2a2b75a9Haiyang Zhang vfree(hv_context.hypercall_page); 2056a0aaa185057801343e000183ef0695c2a2b75a9Haiyang Zhang hv_context.hypercall_page = NULL; 2063e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen } 2073e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen} 2083e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen 2093e18951955797872558dad615851a4ca63b2770eHank Janssen/* 210d44890c8d2a83116463c230b59b9b9d356aafe85Haiyang Zhang * hv_post_message - Post a message using the hypervisor message IPC. 2110831ad041fd3611b31c10b46b9716b3c6289f1a1Greg Kroah-Hartman * 2120831ad041fd3611b31c10b46b9716b3c6289f1a1Greg Kroah-Hartman * This involves a hypercall. 2130831ad041fd3611b31c10b46b9716b3c6289f1a1Greg Kroah-Hartman */ 214415f0a02adaea754dc85cde7b50707f7fbc4cf3fDan Carpenterint hv_post_message(union hv_connection_id connection_id, 215b8dfb264f4f9e55f9cf8384cb782dfe5159c413cHaiyang Zhang enum hv_message_type message_type, 216b8dfb264f4f9e55f9cf8384cb782dfe5159c413cHaiyang Zhang void *payload, size_t payload_size) 2173e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen{ 218b8dfb264f4f9e55f9cf8384cb782dfe5159c413cHaiyang Zhang struct aligned_input { 2190831ad041fd3611b31c10b46b9716b3c6289f1a1Greg Kroah-Hartman u64 alignment8; 220cba4decdd3dcd224b17631572456951aace0a27eGreg Kroah-Hartman struct hv_input_post_message msg; 2213e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen }; 2223e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen 223b8dfb264f4f9e55f9cf8384cb782dfe5159c413cHaiyang Zhang struct hv_input_post_message *aligned_msg; 224034469e6338b8d683419e3ee7f2543419dd5b574Greg Kroah-Hartman u16 status; 225c4b0bc94828a86cfb6a975b0e0d92dc1cd389565Greg Kroah-Hartman unsigned long addr; 2263e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen 227b8dfb264f4f9e55f9cf8384cb782dfe5159c413cHaiyang Zhang if (payload_size > HV_MESSAGE_PAYLOAD_BYTE_COUNT) 22839594abcd47da2f587804dff2fedbd7ada4670d0K. Y. Srinivasan return -EMSGSIZE; 2293e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen 230b8dfb264f4f9e55f9cf8384cb782dfe5159c413cHaiyang Zhang addr = (unsigned long)kmalloc(sizeof(struct aligned_input), GFP_ATOMIC); 2313e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen if (!addr) 23239594abcd47da2f587804dff2fedbd7ada4670d0K. Y. Srinivasan return -ENOMEM; 2333e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen 234b8dfb264f4f9e55f9cf8384cb782dfe5159c413cHaiyang Zhang aligned_msg = (struct hv_input_post_message *) 2357350968193f9b94c4a4b7d14d7a44333a322c5d7Uwe Kleine-König (ALIGN(addr, HV_HYPERCALL_PARAM_ALIGN)); 2363e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen 237b8dfb264f4f9e55f9cf8384cb782dfe5159c413cHaiyang Zhang aligned_msg->connectionid = connection_id; 238b8dfb264f4f9e55f9cf8384cb782dfe5159c413cHaiyang Zhang aligned_msg->message_type = message_type; 239b8dfb264f4f9e55f9cf8384cb782dfe5159c413cHaiyang Zhang aligned_msg->payload_size = payload_size; 240b8dfb264f4f9e55f9cf8384cb782dfe5159c413cHaiyang Zhang memcpy((void *)aligned_msg->payload, payload, payload_size); 2413e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen 242d44890c8d2a83116463c230b59b9b9d356aafe85Haiyang Zhang status = do_hypercall(HVCALL_POST_MESSAGE, aligned_msg, NULL) 243d44890c8d2a83116463c230b59b9b9d356aafe85Haiyang Zhang & 0xFFFF; 2443e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen 2450831ad041fd3611b31c10b46b9716b3c6289f1a1Greg Kroah-Hartman kfree((void *)addr); 2463e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen 2473e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen return status; 2483e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen} 2493e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen 2503e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen 2513e18951955797872558dad615851a4ca63b2770eHank Janssen/* 252d44890c8d2a83116463c230b59b9b9d356aafe85Haiyang Zhang * hv_signal_event - 253d44890c8d2a83116463c230b59b9b9d356aafe85Haiyang Zhang * Signal an event on the specified connection using the hypervisor event IPC. 2540831ad041fd3611b31c10b46b9716b3c6289f1a1Greg Kroah-Hartman * 2550831ad041fd3611b31c10b46b9716b3c6289f1a1Greg Kroah-Hartman * This involves a hypercall. 2560831ad041fd3611b31c10b46b9716b3c6289f1a1Greg Kroah-Hartman */ 2571f42248d724a413baaafd5f83a8f4746bc6f51a5K. Y. Srinivasanu16 hv_signal_event(void *con_id) 2583e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen{ 259034469e6338b8d683419e3ee7f2543419dd5b574Greg Kroah-Hartman u16 status; 2603e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen 2611f42248d724a413baaafd5f83a8f4746bc6f51a5K. Y. Srinivasan status = (do_hypercall(HVCALL_SIGNAL_EVENT, con_id, NULL) & 0xFFFF); 2621f42248d724a413baaafd5f83a8f4746bc6f51a5K. Y. Srinivasan 2633e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen return status; 2643e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen} 2653e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen 2663e18951955797872558dad615851a4ca63b2770eHank Janssen/* 267d44890c8d2a83116463c230b59b9b9d356aafe85Haiyang Zhang * hv_synic_init - Initialize the Synthethic Interrupt Controller. 2680831ad041fd3611b31c10b46b9716b3c6289f1a1Greg Kroah-Hartman * 2690831ad041fd3611b31c10b46b9716b3c6289f1a1Greg Kroah-Hartman * If it is already initialized by another entity (ie x2v shim), we need to 2700831ad041fd3611b31c10b46b9716b3c6289f1a1Greg Kroah-Hartman * retrieve the initialized message and event pages. Otherwise, we create and 2710831ad041fd3611b31c10b46b9716b3c6289f1a1Greg Kroah-Hartman * initialize the message and event pages. 2720831ad041fd3611b31c10b46b9716b3c6289f1a1Greg Kroah-Hartman */ 273d44890c8d2a83116463c230b59b9b9d356aafe85Haiyang Zhangvoid hv_synic_init(void *irqarg) 2743e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen{ 2750831ad041fd3611b31c10b46b9716b3c6289f1a1Greg Kroah-Hartman u64 version; 276eacb1b4d24c2a8b7c1d73bb72e04920980ec8a4fGreg Kroah-Hartman union hv_synic_simp simp; 277eacb1b4d24c2a8b7c1d73bb72e04920980ec8a4fGreg Kroah-Hartman union hv_synic_siefp siefp; 278b8dfb264f4f9e55f9cf8384cb782dfe5159c413cHaiyang Zhang union hv_synic_sint shared_sint; 279eacb1b4d24c2a8b7c1d73bb72e04920980ec8a4fGreg Kroah-Hartman union hv_synic_scontrol sctrl; 280917ea427c78670958488f7f304e4629c325969a4K. Y. Srinivasan u64 vp_index; 281a73e6b7c508f610eeb315c443d9ac79041124af0Hank Janssen 282b8dfb264f4f9e55f9cf8384cb782dfe5159c413cHaiyang Zhang u32 irq_vector = *((u32 *)(irqarg)); 2837692fd4d441afac728cb83fdd33349d5ba07406cGreg Kroah-Hartman int cpu = smp_processor_id(); 2843e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen 2856a0aaa185057801343e000183ef0695c2a2b75a9Haiyang Zhang if (!hv_context.hypercall_page) 2867692fd4d441afac728cb83fdd33349d5ba07406cGreg Kroah-Hartman return; 2873e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen 288454f18a963cf6519bf317e74e6b9781ffef8d253Bill Pemberton /* Check the version */ 289a51ed7d65d62aa5ad8d364aa76af30328c26263fGreg Kroah-Hartman rdmsrl(HV_X64_MSR_SVERSION, version); 2903e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen 291db11f12a11c9f04d504510e1cc20775209b0e509K. Y. Srinivasan hv_context.event_dpc[cpu] = (struct tasklet_struct *) 292db11f12a11c9f04d504510e1cc20775209b0e509K. Y. Srinivasan kmalloc(sizeof(struct tasklet_struct), 293db11f12a11c9f04d504510e1cc20775209b0e509K. Y. Srinivasan GFP_ATOMIC); 294db11f12a11c9f04d504510e1cc20775209b0e509K. Y. Srinivasan if (hv_context.event_dpc[cpu] == NULL) { 295db11f12a11c9f04d504510e1cc20775209b0e509K. Y. Srinivasan pr_err("Unable to allocate event dpc\n"); 296db11f12a11c9f04d504510e1cc20775209b0e509K. Y. Srinivasan goto cleanup; 297db11f12a11c9f04d504510e1cc20775209b0e509K. Y. Srinivasan } 298db11f12a11c9f04d504510e1cc20775209b0e509K. Y. Srinivasan tasklet_init(hv_context.event_dpc[cpu], vmbus_on_event, cpu); 299db11f12a11c9f04d504510e1cc20775209b0e509K. Y. Srinivasan 3006a0aaa185057801343e000183ef0695c2a2b75a9Haiyang Zhang hv_context.synic_message_page[cpu] = 3016a0aaa185057801343e000183ef0695c2a2b75a9Haiyang Zhang (void *)get_zeroed_page(GFP_ATOMIC); 3023e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen 3036a0aaa185057801343e000183ef0695c2a2b75a9Haiyang Zhang if (hv_context.synic_message_page[cpu] == NULL) { 3040a46618d58c90f93e8b8e9a18062d1691b70297eHank Janssen pr_err("Unable to allocate SYNIC message page\n"); 30544939d37cc03af996d93b9d15385ac13de2bd627K. Y. Srinivasan goto cleanup; 306a73e6b7c508f610eeb315c443d9ac79041124af0Hank Janssen } 3073e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen 3086a0aaa185057801343e000183ef0695c2a2b75a9Haiyang Zhang hv_context.synic_event_page[cpu] = 3096a0aaa185057801343e000183ef0695c2a2b75a9Haiyang Zhang (void *)get_zeroed_page(GFP_ATOMIC); 3103e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen 3116a0aaa185057801343e000183ef0695c2a2b75a9Haiyang Zhang if (hv_context.synic_event_page[cpu] == NULL) { 3120a46618d58c90f93e8b8e9a18062d1691b70297eHank Janssen pr_err("Unable to allocate SYNIC event page\n"); 31344939d37cc03af996d93b9d15385ac13de2bd627K. Y. Srinivasan goto cleanup; 314a73e6b7c508f610eeb315c443d9ac79041124af0Hank Janssen } 3153e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen 316a73e6b7c508f610eeb315c443d9ac79041124af0Hank Janssen /* Setup the Synic's message page */ 317f6feebe073db4c97dc10f6fab54f9d4b5816886bHaiyang Zhang rdmsrl(HV_X64_MSR_SIMP, simp.as_uint64); 318f6feebe073db4c97dc10f6fab54f9d4b5816886bHaiyang Zhang simp.simp_enabled = 1; 3196a0aaa185057801343e000183ef0695c2a2b75a9Haiyang Zhang simp.base_simp_gpa = virt_to_phys(hv_context.synic_message_page[cpu]) 320a73e6b7c508f610eeb315c443d9ac79041124af0Hank Janssen >> PAGE_SHIFT; 3213e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen 322f6feebe073db4c97dc10f6fab54f9d4b5816886bHaiyang Zhang wrmsrl(HV_X64_MSR_SIMP, simp.as_uint64); 3233e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen 324a73e6b7c508f610eeb315c443d9ac79041124af0Hank Janssen /* Setup the Synic's event page */ 325f6feebe073db4c97dc10f6fab54f9d4b5816886bHaiyang Zhang rdmsrl(HV_X64_MSR_SIEFP, siefp.as_uint64); 326f6feebe073db4c97dc10f6fab54f9d4b5816886bHaiyang Zhang siefp.siefp_enabled = 1; 3276a0aaa185057801343e000183ef0695c2a2b75a9Haiyang Zhang siefp.base_siefp_gpa = virt_to_phys(hv_context.synic_event_page[cpu]) 328a73e6b7c508f610eeb315c443d9ac79041124af0Hank Janssen >> PAGE_SHIFT; 329a73e6b7c508f610eeb315c443d9ac79041124af0Hank Janssen 330f6feebe073db4c97dc10f6fab54f9d4b5816886bHaiyang Zhang wrmsrl(HV_X64_MSR_SIEFP, siefp.as_uint64); 3310831ad041fd3611b31c10b46b9716b3c6289f1a1Greg Kroah-Hartman 3320831ad041fd3611b31c10b46b9716b3c6289f1a1Greg Kroah-Hartman /* Setup the shared SINT. */ 333b8dfb264f4f9e55f9cf8384cb782dfe5159c413cHaiyang Zhang rdmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64); 3343e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen 335b8dfb264f4f9e55f9cf8384cb782dfe5159c413cHaiyang Zhang shared_sint.as_uint64 = 0; 336b8dfb264f4f9e55f9cf8384cb782dfe5159c413cHaiyang Zhang shared_sint.vector = irq_vector; /* HV_SHARED_SINT_IDT_VECTOR + 0x20; */ 337b8dfb264f4f9e55f9cf8384cb782dfe5159c413cHaiyang Zhang shared_sint.masked = false; 338b0209501dc7586cbfbf6d023f2dd3ce4621aff2cK. Y. Srinivasan shared_sint.auto_eoi = true; 3393e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen 340b8dfb264f4f9e55f9cf8384cb782dfe5159c413cHaiyang Zhang wrmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64); 3413e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen 342454f18a963cf6519bf317e74e6b9781ffef8d253Bill Pemberton /* Enable the global synic bit */ 343f6feebe073db4c97dc10f6fab54f9d4b5816886bHaiyang Zhang rdmsrl(HV_X64_MSR_SCONTROL, sctrl.as_uint64); 344f6feebe073db4c97dc10f6fab54f9d4b5816886bHaiyang Zhang sctrl.enable = 1; 3453e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen 346f6feebe073db4c97dc10f6fab54f9d4b5816886bHaiyang Zhang wrmsrl(HV_X64_MSR_SCONTROL, sctrl.as_uint64); 3473e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen 3486a0aaa185057801343e000183ef0695c2a2b75a9Haiyang Zhang hv_context.synic_initialized = true; 349917ea427c78670958488f7f304e4629c325969a4K. Y. Srinivasan 350917ea427c78670958488f7f304e4629c325969a4K. Y. Srinivasan /* 351917ea427c78670958488f7f304e4629c325969a4K. Y. Srinivasan * Setup the mapping between Hyper-V's notion 352917ea427c78670958488f7f304e4629c325969a4K. Y. Srinivasan * of cpuid and Linux' notion of cpuid. 353917ea427c78670958488f7f304e4629c325969a4K. Y. Srinivasan * This array will be indexed using Linux cpuid. 354917ea427c78670958488f7f304e4629c325969a4K. Y. Srinivasan */ 355917ea427c78670958488f7f304e4629c325969a4K. Y. Srinivasan rdmsrl(HV_X64_MSR_VP_INDEX, vp_index); 356917ea427c78670958488f7f304e4629c325969a4K. Y. Srinivasan hv_context.vp_index[cpu] = (u32)vp_index; 3577692fd4d441afac728cb83fdd33349d5ba07406cGreg Kroah-Hartman return; 3583e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen 35944939d37cc03af996d93b9d15385ac13de2bd627K. Y. Srinivasancleanup: 3606a0aaa185057801343e000183ef0695c2a2b75a9Haiyang Zhang if (hv_context.synic_event_page[cpu]) 361df3493e0b3ba72f9b6192a91b24197cac41ce557K. Y. Srinivasan free_page((unsigned long)hv_context.synic_event_page[cpu]); 3623e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen 3636a0aaa185057801343e000183ef0695c2a2b75a9Haiyang Zhang if (hv_context.synic_message_page[cpu]) 364df3493e0b3ba72f9b6192a91b24197cac41ce557K. Y. Srinivasan free_page((unsigned long)hv_context.synic_message_page[cpu]); 3657692fd4d441afac728cb83fdd33349d5ba07406cGreg Kroah-Hartman return; 3663e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen} 3673e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen 3683e18951955797872558dad615851a4ca63b2770eHank Janssen/* 369d44890c8d2a83116463c230b59b9b9d356aafe85Haiyang Zhang * hv_synic_cleanup - Cleanup routine for hv_synic_init(). 3700831ad041fd3611b31c10b46b9716b3c6289f1a1Greg Kroah-Hartman */ 371d44890c8d2a83116463c230b59b9b9d356aafe85Haiyang Zhangvoid hv_synic_cleanup(void *arg) 3723e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen{ 373b8dfb264f4f9e55f9cf8384cb782dfe5159c413cHaiyang Zhang union hv_synic_sint shared_sint; 374eacb1b4d24c2a8b7c1d73bb72e04920980ec8a4fGreg Kroah-Hartman union hv_synic_simp simp; 375eacb1b4d24c2a8b7c1d73bb72e04920980ec8a4fGreg Kroah-Hartman union hv_synic_siefp siefp; 3767692fd4d441afac728cb83fdd33349d5ba07406cGreg Kroah-Hartman int cpu = smp_processor_id(); 3773e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen 3786a0aaa185057801343e000183ef0695c2a2b75a9Haiyang Zhang if (!hv_context.synic_initialized) 3793e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen return; 3803e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen 381b8dfb264f4f9e55f9cf8384cb782dfe5159c413cHaiyang Zhang rdmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64); 3823e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen 383b8dfb264f4f9e55f9cf8384cb782dfe5159c413cHaiyang Zhang shared_sint.masked = 1; 3843e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen 3857692fd4d441afac728cb83fdd33349d5ba07406cGreg Kroah-Hartman /* Need to correctly cleanup in the case of SMP!!! */ 386454f18a963cf6519bf317e74e6b9781ffef8d253Bill Pemberton /* Disable the interrupt */ 387b8dfb264f4f9e55f9cf8384cb782dfe5159c413cHaiyang Zhang wrmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64); 3883e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen 389f6feebe073db4c97dc10f6fab54f9d4b5816886bHaiyang Zhang rdmsrl(HV_X64_MSR_SIMP, simp.as_uint64); 390f6feebe073db4c97dc10f6fab54f9d4b5816886bHaiyang Zhang simp.simp_enabled = 0; 391f6feebe073db4c97dc10f6fab54f9d4b5816886bHaiyang Zhang simp.base_simp_gpa = 0; 3923e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen 393f6feebe073db4c97dc10f6fab54f9d4b5816886bHaiyang Zhang wrmsrl(HV_X64_MSR_SIMP, simp.as_uint64); 3943e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen 395f6feebe073db4c97dc10f6fab54f9d4b5816886bHaiyang Zhang rdmsrl(HV_X64_MSR_SIEFP, siefp.as_uint64); 396f6feebe073db4c97dc10f6fab54f9d4b5816886bHaiyang Zhang siefp.siefp_enabled = 0; 397f6feebe073db4c97dc10f6fab54f9d4b5816886bHaiyang Zhang siefp.base_siefp_gpa = 0; 3983e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen 399f6feebe073db4c97dc10f6fab54f9d4b5816886bHaiyang Zhang wrmsrl(HV_X64_MSR_SIEFP, siefp.as_uint64); 4003e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen 401df3493e0b3ba72f9b6192a91b24197cac41ce557K. Y. Srinivasan free_page((unsigned long)hv_context.synic_message_page[cpu]); 402df3493e0b3ba72f9b6192a91b24197cac41ce557K. Y. Srinivasan free_page((unsigned long)hv_context.synic_event_page[cpu]); 4033e7ee4902fe6996048f03433dd111426db3cfa92Hank Janssen} 404