| /* |
| * Copyright (c) 2009, Microsoft Corporation. |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms and conditions of the GNU General Public License, |
| * version 2, as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| * more details. |
| * |
| * You should have received a copy of the GNU General Public License along with |
| * this program; if not, write to the Free Software Foundation, Inc., 59 Temple |
| * Place - Suite 330, Boston, MA 02111-1307 USA. |
| * |
| * Authors: |
| * Haiyang Zhang <haiyangz@microsoft.com> |
| * Hank Janssen <hjanssen@microsoft.com> |
| * |
| */ |
| #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| |
| #include <linux/kernel.h> |
| #include <linux/mm.h> |
| #include <linux/slab.h> |
| #include <linux/vmalloc.h> |
| |
| #include "hyperv.h" |
| #include "hyperv_vmbus.h" |
| |
| /* The one and only */ |
| struct hv_context hv_context = { |
| .synic_initialized = false, |
| .hypercall_page = NULL, |
| .signal_event_param = NULL, |
| .signal_event_buffer = NULL, |
| }; |
| |
| /* |
| * query_hypervisor_presence |
| * - Query the cpuid for presence of windows hypervisor |
| */ |
| static int query_hypervisor_presence(void) |
| { |
| unsigned int eax; |
| unsigned int ebx; |
| unsigned int ecx; |
| unsigned int edx; |
| unsigned int op; |
| |
| eax = 0; |
| ebx = 0; |
| ecx = 0; |
| edx = 0; |
| op = HVCPUID_VERSION_FEATURES; |
| cpuid(op, &eax, &ebx, &ecx, &edx); |
| |
| return ecx & HV_PRESENT_BIT; |
| } |
| |
| /* |
| * query_hypervisor_info - Get version info of the windows hypervisor |
| */ |
| static int query_hypervisor_info(void) |
| { |
| unsigned int eax; |
| unsigned int ebx; |
| unsigned int ecx; |
| unsigned int edx; |
| unsigned int max_leaf; |
| unsigned int op; |
| |
| /* |
| * Its assumed that this is called after confirming that Viridian |
| * is present. Query id and revision. |
| */ |
| eax = 0; |
| ebx = 0; |
| ecx = 0; |
| edx = 0; |
| op = HVCPUID_VENDOR_MAXFUNCTION; |
| cpuid(op, &eax, &ebx, &ecx, &edx); |
| |
| max_leaf = eax; |
| |
| if (max_leaf >= HVCPUID_VERSION) { |
| eax = 0; |
| ebx = 0; |
| ecx = 0; |
| edx = 0; |
| op = HVCPUID_VERSION; |
| cpuid(op, &eax, &ebx, &ecx, &edx); |
| pr_info("Hyper-V Host OS Build:%d-%d.%d-%d-%d.%d\n", |
| eax, |
| ebx >> 16, |
| ebx & 0xFFFF, |
| ecx, |
| edx >> 24, |
| edx & 0xFFFFFF); |
| } |
| return max_leaf; |
| } |
| |
| /* |
| * do_hypercall- Invoke the specified hypercall |
| */ |
| static u64 do_hypercall(u64 control, void *input, void *output) |
| { |
| #ifdef CONFIG_X86_64 |
| u64 hv_status = 0; |
| u64 input_address = (input) ? virt_to_phys(input) : 0; |
| u64 output_address = (output) ? virt_to_phys(output) : 0; |
| void *hypercall_page = hv_context.hypercall_page; |
| |
| __asm__ __volatile__("mov %0, %%r8" : : "r" (output_address) : "r8"); |
| __asm__ __volatile__("call *%3" : "=a" (hv_status) : |
| "c" (control), "d" (input_address), |
| "m" (hypercall_page)); |
| |
| return hv_status; |
| |
| #else |
| |
| u32 control_hi = control >> 32; |
| u32 control_lo = control & 0xFFFFFFFF; |
| u32 hv_status_hi = 1; |
| u32 hv_status_lo = 1; |
| u64 input_address = (input) ? virt_to_phys(input) : 0; |
| u32 input_address_hi = input_address >> 32; |
| u32 input_address_lo = input_address & 0xFFFFFFFF; |
| u64 output_address = (output) ? virt_to_phys(output) : 0; |
| u32 output_address_hi = output_address >> 32; |
| u32 output_address_lo = output_address & 0xFFFFFFFF; |
| void *hypercall_page = hv_context.hypercall_page; |
| |
| __asm__ __volatile__ ("call *%8" : "=d"(hv_status_hi), |
| "=a"(hv_status_lo) : "d" (control_hi), |
| "a" (control_lo), "b" (input_address_hi), |
| "c" (input_address_lo), "D"(output_address_hi), |
| "S"(output_address_lo), "m" (hypercall_page)); |
| |
| return hv_status_lo | ((u64)hv_status_hi << 32); |
| #endif /* !x86_64 */ |
| } |
| |
| /* |
| * hv_init - Main initialization routine. |
| * |
| * This routine must be called before any other routines in here are called |
| */ |
| int hv_init(void) |
| { |
| int max_leaf; |
| union hv_x64_msr_hypercall_contents hypercall_msr; |
| void *virtaddr = NULL; |
| |
| memset(hv_context.synic_event_page, 0, sizeof(void *) * MAX_NUM_CPUS); |
| memset(hv_context.synic_message_page, 0, |
| sizeof(void *) * MAX_NUM_CPUS); |
| |
| if (!query_hypervisor_presence()) |
| goto cleanup; |
| |
| max_leaf = query_hypervisor_info(); |
| |
| rdmsrl(HV_X64_MSR_GUEST_OS_ID, hv_context.guestid); |
| |
| if (hv_context.guestid != 0) |
| goto cleanup; |
| |
| /* Write our OS info */ |
| wrmsrl(HV_X64_MSR_GUEST_OS_ID, HV_LINUX_GUEST_ID); |
| hv_context.guestid = HV_LINUX_GUEST_ID; |
| |
| /* See if the hypercall page is already set */ |
| rdmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64); |
| |
| virtaddr = __vmalloc(PAGE_SIZE, GFP_KERNEL, PAGE_KERNEL_EXEC); |
| |
| if (!virtaddr) |
| goto cleanup; |
| |
| hypercall_msr.enable = 1; |
| |
| hypercall_msr.guest_physical_address = vmalloc_to_pfn(virtaddr); |
| wrmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64); |
| |
| /* Confirm that hypercall page did get setup. */ |
| hypercall_msr.as_uint64 = 0; |
| rdmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64); |
| |
| if (!hypercall_msr.enable) |
| goto cleanup; |
| |
| hv_context.hypercall_page = virtaddr; |
| |
| /* Setup the global signal event param for the signal event hypercall */ |
| hv_context.signal_event_buffer = |
| kmalloc(sizeof(struct hv_input_signal_event_buffer), |
| GFP_KERNEL); |
| if (!hv_context.signal_event_buffer) |
| goto cleanup; |
| |
| hv_context.signal_event_param = |
| (struct hv_input_signal_event *) |
| (ALIGN((unsigned long) |
| hv_context.signal_event_buffer, |
| HV_HYPERCALL_PARAM_ALIGN)); |
| hv_context.signal_event_param->connectionid.asu32 = 0; |
| hv_context.signal_event_param->connectionid.u.id = |
| VMBUS_EVENT_CONNECTION_ID; |
| hv_context.signal_event_param->flag_number = 0; |
| hv_context.signal_event_param->rsvdz = 0; |
| |
| return 0; |
| |
| cleanup: |
| if (virtaddr) { |
| if (hypercall_msr.enable) { |
| hypercall_msr.as_uint64 = 0; |
| wrmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64); |
| } |
| |
| vfree(virtaddr); |
| } |
| |
| return -ENOTSUPP; |
| } |
| |
| /* |
| * hv_cleanup - Cleanup routine. |
| * |
| * This routine is called normally during driver unloading or exiting. |
| */ |
| void hv_cleanup(void) |
| { |
| union hv_x64_msr_hypercall_contents hypercall_msr; |
| |
| kfree(hv_context.signal_event_buffer); |
| hv_context.signal_event_buffer = NULL; |
| hv_context.signal_event_param = NULL; |
| |
| if (hv_context.hypercall_page) { |
| hypercall_msr.as_uint64 = 0; |
| wrmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64); |
| vfree(hv_context.hypercall_page); |
| hv_context.hypercall_page = NULL; |
| } |
| } |
| |
| /* |
| * hv_post_message - Post a message using the hypervisor message IPC. |
| * |
| * This involves a hypercall. |
| */ |
| u16 hv_post_message(union hv_connection_id connection_id, |
| enum hv_message_type message_type, |
| void *payload, size_t payload_size) |
| { |
| struct aligned_input { |
| u64 alignment8; |
| struct hv_input_post_message msg; |
| }; |
| |
| struct hv_input_post_message *aligned_msg; |
| u16 status; |
| unsigned long addr; |
| |
| if (payload_size > HV_MESSAGE_PAYLOAD_BYTE_COUNT) |
| return -EMSGSIZE; |
| |
| addr = (unsigned long)kmalloc(sizeof(struct aligned_input), GFP_ATOMIC); |
| if (!addr) |
| return -ENOMEM; |
| |
| aligned_msg = (struct hv_input_post_message *) |
| (ALIGN(addr, HV_HYPERCALL_PARAM_ALIGN)); |
| |
| aligned_msg->connectionid = connection_id; |
| aligned_msg->message_type = message_type; |
| aligned_msg->payload_size = payload_size; |
| memcpy((void *)aligned_msg->payload, payload, payload_size); |
| |
| status = do_hypercall(HVCALL_POST_MESSAGE, aligned_msg, NULL) |
| & 0xFFFF; |
| |
| kfree((void *)addr); |
| |
| return status; |
| } |
| |
| |
| /* |
| * hv_signal_event - |
| * Signal an event on the specified connection using the hypervisor event IPC. |
| * |
| * This involves a hypercall. |
| */ |
| u16 hv_signal_event(void) |
| { |
| u16 status; |
| |
| status = do_hypercall(HVCALL_SIGNAL_EVENT, |
| hv_context.signal_event_param, |
| NULL) & 0xFFFF; |
| return status; |
| } |
| |
| /* |
| * hv_synic_init - Initialize the Synthethic Interrupt Controller. |
| * |
| * If it is already initialized by another entity (ie x2v shim), we need to |
| * retrieve the initialized message and event pages. Otherwise, we create and |
| * initialize the message and event pages. |
| */ |
| void hv_synic_init(void *irqarg) |
| { |
| u64 version; |
| union hv_synic_simp simp; |
| union hv_synic_siefp siefp; |
| union hv_synic_sint shared_sint; |
| union hv_synic_scontrol sctrl; |
| |
| u32 irq_vector = *((u32 *)(irqarg)); |
| int cpu = smp_processor_id(); |
| |
| if (!hv_context.hypercall_page) |
| return; |
| |
| /* Check the version */ |
| rdmsrl(HV_X64_MSR_SVERSION, version); |
| |
| hv_context.synic_message_page[cpu] = |
| (void *)get_zeroed_page(GFP_ATOMIC); |
| |
| if (hv_context.synic_message_page[cpu] == NULL) { |
| pr_err("Unable to allocate SYNIC message page\n"); |
| goto cleanup; |
| } |
| |
| hv_context.synic_event_page[cpu] = |
| (void *)get_zeroed_page(GFP_ATOMIC); |
| |
| if (hv_context.synic_event_page[cpu] == NULL) { |
| pr_err("Unable to allocate SYNIC event page\n"); |
| goto cleanup; |
| } |
| |
| /* Setup the Synic's message page */ |
| rdmsrl(HV_X64_MSR_SIMP, simp.as_uint64); |
| simp.simp_enabled = 1; |
| simp.base_simp_gpa = virt_to_phys(hv_context.synic_message_page[cpu]) |
| >> PAGE_SHIFT; |
| |
| wrmsrl(HV_X64_MSR_SIMP, simp.as_uint64); |
| |
| /* Setup the Synic's event page */ |
| rdmsrl(HV_X64_MSR_SIEFP, siefp.as_uint64); |
| siefp.siefp_enabled = 1; |
| siefp.base_siefp_gpa = virt_to_phys(hv_context.synic_event_page[cpu]) |
| >> PAGE_SHIFT; |
| |
| wrmsrl(HV_X64_MSR_SIEFP, siefp.as_uint64); |
| |
| /* Setup the shared SINT. */ |
| rdmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64); |
| |
| shared_sint.as_uint64 = 0; |
| shared_sint.vector = irq_vector; /* HV_SHARED_SINT_IDT_VECTOR + 0x20; */ |
| shared_sint.masked = false; |
| shared_sint.auto_eoi = false; |
| |
| wrmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64); |
| |
| /* Enable the global synic bit */ |
| rdmsrl(HV_X64_MSR_SCONTROL, sctrl.as_uint64); |
| sctrl.enable = 1; |
| |
| wrmsrl(HV_X64_MSR_SCONTROL, sctrl.as_uint64); |
| |
| hv_context.synic_initialized = true; |
| return; |
| |
| cleanup: |
| if (hv_context.synic_event_page[cpu]) |
| free_page((unsigned long)hv_context.synic_event_page[cpu]); |
| |
| if (hv_context.synic_message_page[cpu]) |
| free_page((unsigned long)hv_context.synic_message_page[cpu]); |
| return; |
| } |
| |
| /* |
| * hv_synic_cleanup - Cleanup routine for hv_synic_init(). |
| */ |
| void hv_synic_cleanup(void *arg) |
| { |
| union hv_synic_sint shared_sint; |
| union hv_synic_simp simp; |
| union hv_synic_siefp siefp; |
| int cpu = smp_processor_id(); |
| |
| if (!hv_context.synic_initialized) |
| return; |
| |
| rdmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64); |
| |
| shared_sint.masked = 1; |
| |
| /* Need to correctly cleanup in the case of SMP!!! */ |
| /* Disable the interrupt */ |
| wrmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64); |
| |
| rdmsrl(HV_X64_MSR_SIMP, simp.as_uint64); |
| simp.simp_enabled = 0; |
| simp.base_simp_gpa = 0; |
| |
| wrmsrl(HV_X64_MSR_SIMP, simp.as_uint64); |
| |
| rdmsrl(HV_X64_MSR_SIEFP, siefp.as_uint64); |
| siefp.siefp_enabled = 0; |
| siefp.base_siefp_gpa = 0; |
| |
| wrmsrl(HV_X64_MSR_SIEFP, siefp.as_uint64); |
| |
| free_page((unsigned long)hv_context.synic_message_page[cpu]); |
| free_page((unsigned long)hv_context.synic_event_page[cpu]); |
| } |