/* * 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 <linux/hyperv.h> #include <asm/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]); }