diff options
Diffstat (limited to 'drivers/kvm/x86.c')
| -rw-r--r-- | drivers/kvm/x86.c | 3148 |
1 files changed, 0 insertions, 3148 deletions
diff --git a/drivers/kvm/x86.c b/drivers/kvm/x86.c deleted file mode 100644 index b37c0093..0000000 --- a/drivers/kvm/x86.c +++ /dev/null @@ -1,3148 +0,0 @@ -/* - * Kernel-based Virtual Machine driver for Linux - * - * derived from drivers/kvm/kvm_main.c - * - * Copyright (C) 2006 Qumranet, Inc. - * - * Authors: - * Avi Kivity <avi@qumranet.com> - * Yaniv Kamay <yaniv@qumranet.com> - * - * This work is licensed under the terms of the GNU GPL, version 2. See - * the COPYING file in the top-level directory. - * - */ - -#include "kvm.h" -#include "x86.h" -#include "x86_emulate.h" -#include "segment_descriptor.h" -#include "irq.h" -#include "mmu.h" - -#include <linux/kvm.h> -#include <linux/fs.h> -#include <linux/vmalloc.h> -#include <linux/module.h> -#include <linux/mman.h> -#include <linux/highmem.h> - -#include <asm/uaccess.h> -#include <asm/msr.h> - -#define MAX_IO_MSRS 256 -#define CR0_RESERVED_BITS \ - (~(unsigned long)(X86_CR0_PE | X86_CR0_MP | X86_CR0_EM | X86_CR0_TS \ - | X86_CR0_ET | X86_CR0_NE | X86_CR0_WP | X86_CR0_AM \ - | X86_CR0_NW | X86_CR0_CD | X86_CR0_PG)) -#define CR4_RESERVED_BITS \ - (~(unsigned long)(X86_CR4_VME | X86_CR4_PVI | X86_CR4_TSD | X86_CR4_DE\ - | X86_CR4_PSE | X86_CR4_PAE | X86_CR4_MCE \ - | X86_CR4_PGE | X86_CR4_PCE | X86_CR4_OSFXSR \ - | X86_CR4_OSXMMEXCPT | X86_CR4_VMXE)) - -#define CR8_RESERVED_BITS (~(unsigned long)X86_CR8_TPR) -#define EFER_RESERVED_BITS 0xfffffffffffff2fe - -#define VM_STAT(x) offsetof(struct kvm, stat.x), KVM_STAT_VM -#define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU - -struct kvm_x86_ops *kvm_x86_ops; - -struct kvm_stats_debugfs_item debugfs_entries[] = { - { "pf_fixed", VCPU_STAT(pf_fixed) }, - { "pf_guest", VCPU_STAT(pf_guest) }, - { "tlb_flush", VCPU_STAT(tlb_flush) }, - { "invlpg", VCPU_STAT(invlpg) }, - { "exits", VCPU_STAT(exits) }, - { "io_exits", VCPU_STAT(io_exits) }, - { "mmio_exits", VCPU_STAT(mmio_exits) }, - { "signal_exits", VCPU_STAT(signal_exits) }, - { "irq_window", VCPU_STAT(irq_window_exits) }, - { "halt_exits", VCPU_STAT(halt_exits) }, - { "halt_wakeup", VCPU_STAT(halt_wakeup) }, - { "request_irq", VCPU_STAT(request_irq_exits) }, - { "irq_exits", VCPU_STAT(irq_exits) }, - { "host_state_reload", VCPU_STAT(host_state_reload) }, - { "efer_reload", VCPU_STAT(efer_reload) }, - { "fpu_reload", VCPU_STAT(fpu_reload) }, - { "insn_emulation", VCPU_STAT(insn_emulation) }, - { "insn_emulation_fail", VCPU_STAT(insn_emulation_fail) }, - { "mmu_shadow_zapped", VM_STAT(mmu_shadow_zapped) }, - { "mmu_pte_write", VM_STAT(mmu_pte_write) }, - { "mmu_pte_updated", VM_STAT(mmu_pte_updated) }, - { "mmu_pde_zapped", VM_STAT(mmu_pde_zapped) }, - { "mmu_flooded", VM_STAT(mmu_flooded) }, - { "mmu_recycled", VM_STAT(mmu_recycled) }, - { "remote_tlb_flush", VM_STAT(remote_tlb_flush) }, - { NULL } -}; - - -unsigned long segment_base(u16 selector) -{ - struct descriptor_table gdt; - struct segment_descriptor *d; - unsigned long table_base; - unsigned long v; - - if (selector == 0) - return 0; - - asm("sgdt %0" : "=m"(gdt)); - table_base = gdt.base; - - if (selector & 4) { /* from ldt */ - u16 ldt_selector; - - asm("sldt %0" : "=g"(ldt_selector)); - table_base = segment_base(ldt_selector); - } - d = (struct segment_descriptor *)(table_base + (selector & ~7)); - v = d->base_low | ((unsigned long)d->base_mid << 16) | - ((unsigned long)d->base_high << 24); -#ifdef CONFIG_X86_64 - if (d->system == 0 && (d->type == 2 || d->type == 9 || d->type == 11)) - v |= ((unsigned long) \ - ((struct segment_descriptor_64 *)d)->base_higher) << 32; -#endif - return v; -} -EXPORT_SYMBOL_GPL(segment_base); - -u64 kvm_get_apic_base(struct kvm_vcpu *vcpu) -{ - if (irqchip_in_kernel(vcpu->kvm)) - return vcpu->arch.apic_base; - else - return vcpu->arch.apic_base; -} -EXPORT_SYMBOL_GPL(kvm_get_apic_base); - -void kvm_set_apic_base(struct kvm_vcpu *vcpu, u64 data) -{ - /* TODO: reserve bits check */ - if (irqchip_in_kernel(vcpu->kvm)) - kvm_lapic_set_base(vcpu, data); - else - vcpu->arch.apic_base = data; -} -EXPORT_SYMBOL_GPL(kvm_set_apic_base); - -void kvm_queue_exception(struct kvm_vcpu *vcpu, unsigned nr) -{ - WARN_ON(vcpu->arch.exception.pending); - vcpu->arch.exception.pending = true; - vcpu->arch.exception.has_error_code = false; - vcpu->arch.exception.nr = nr; -} -EXPORT_SYMBOL_GPL(kvm_queue_exception); - -void kvm_inject_page_fault(struct kvm_vcpu *vcpu, unsigned long addr, - u32 error_code) -{ - ++vcpu->stat.pf_guest; - if (vcpu->arch.exception.pending && vcpu->arch.exception.nr == PF_VECTOR) { - printk(KERN_DEBUG "kvm: inject_page_fault:" - " double fault 0x%lx\n", addr); - vcpu->arch.exception.nr = DF_VECTOR; - vcpu->arch.exception.error_code = 0; - return; - } - vcpu->arch.cr2 = addr; - kvm_queue_exception_e(vcpu, PF_VECTOR, error_code); -} - -void kvm_queue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code) -{ - WARN_ON(vcpu->arch.exception.pending); - vcpu->arch.exception.pending = true; - vcpu->arch.exception.has_error_code = true; - vcpu->arch.exception.nr = nr; - vcpu->arch.exception.error_code = error_code; -} -EXPORT_SYMBOL_GPL(kvm_queue_exception_e); - -static void __queue_exception(struct kvm_vcpu *vcpu) -{ - kvm_x86_ops->queue_exception(vcpu, vcpu->arch.exception.nr, - vcpu->arch.exception.has_error_code, - vcpu->arch.exception.error_code); -} - -/* - * Load the pae pdptrs. Return true is they are all valid. - */ -int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3) -{ - gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT; - unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2; - int i; - int ret; - u64 pdpte[ARRAY_SIZE(vcpu->arch.pdptrs)]; - - mutex_lock(&vcpu->kvm->lock); - ret = kvm_read_guest_page(vcpu->kvm, pdpt_gfn, pdpte, - offset * sizeof(u64), sizeof(pdpte)); - if (ret < 0) { - ret = 0; - goto out; - } - for (i = 0; i < ARRAY_SIZE(pdpte); ++i) { - if ((pdpte[i] & 1) && (pdpte[i] & 0xfffffff0000001e6ull)) { - ret = 0; - goto out; - } - } - ret = 1; - - memcpy(vcpu->arch.pdptrs, pdpte, sizeof(vcpu->arch.pdptrs)); -out: - mutex_unlock(&vcpu->kvm->lock); - - return ret; -} - -static bool pdptrs_changed(struct kvm_vcpu *vcpu) -{ - u64 pdpte[ARRAY_SIZE(vcpu->arch.pdptrs)]; - bool changed = true; - int r; - - if (is_long_mode(vcpu) || !is_pae(vcpu)) - return false; - - mutex_lock(&vcpu->kvm->lock); - r = kvm_read_guest(vcpu->kvm, vcpu->arch.cr3 & ~31u, pdpte, sizeof(pdpte)); - if (r < 0) - goto out; - changed = memcmp(pdpte, vcpu->arch.pdptrs, sizeof(pdpte)) != 0; -out: - mutex_unlock(&vcpu->kvm->lock); - - return changed; -} - -void set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0) -{ - if (cr0 & CR0_RESERVED_BITS) { - printk(KERN_DEBUG "set_cr0: 0x%lx #GP, reserved bits 0x%lx\n", - cr0, vcpu->arch.cr0); - kvm_inject_gp(vcpu, 0); - return; - } - - if ((cr0 & X86_CR0_NW) && !(cr0 & X86_CR0_CD)) { - printk(KERN_DEBUG "set_cr0: #GP, CD == 0 && NW == 1\n"); - kvm_inject_gp(vcpu, 0); - return; - } - - if ((cr0 & X86_CR0_PG) && !(cr0 & X86_CR0_PE)) { - printk(KERN_DEBUG "set_cr0: #GP, set PG flag " - "and a clear PE flag\n"); - kvm_inject_gp(vcpu, 0); - return; - } - - if (!is_paging(vcpu) && (cr0 & X86_CR0_PG)) { -#ifdef CONFIG_X86_64 - if ((vcpu->arch.shadow_efer & EFER_LME)) { - int cs_db, cs_l; - - if (!is_pae(vcpu)) { - printk(KERN_DEBUG "set_cr0: #GP, start paging " - "in long mode while PAE is disabled\n"); - kvm_inject_gp(vcpu, 0); - return; - } - kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l); - if (cs_l) { - printk(KERN_DEBUG "set_cr0: #GP, start paging " - "in long mode while CS.L == 1\n"); - kvm_inject_gp(vcpu, 0); - return; - - } - } else -#endif - if (is_pae(vcpu) && !load_pdptrs(vcpu, vcpu->arch.cr3)) { - printk(KERN_DEBUG "set_cr0: #GP, pdptrs " - "reserved bits\n"); - kvm_inject_gp(vcpu, 0); - return; - } - - } - - kvm_x86_ops->set_cr0(vcpu, cr0); - vcpu->arch.cr0 = cr0; - - mutex_lock(&vcpu->kvm->lock); - kvm_mmu_reset_context(vcpu); - mutex_unlock(&vcpu->kvm->lock); - return; -} -EXPORT_SYMBOL_GPL(set_cr0); - -void lmsw(struct kvm_vcpu *vcpu, unsigned long msw) -{ - set_cr0(vcpu, (vcpu->arch.cr0 & ~0x0ful) | (msw & 0x0f)); -} -EXPORT_SYMBOL_GPL(lmsw); - -void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4) -{ - if (cr4 & CR4_RESERVED_BITS) { - printk(KERN_DEBUG "set_cr4: #GP, reserved bits\n"); - kvm_inject_gp(vcpu, 0); - return; - } - - if (is_long_mode(vcpu)) { - if (!(cr4 & X86_CR4_PAE)) { - printk(KERN_DEBUG "set_cr4: #GP, clearing PAE while " - "in long mode\n"); - kvm_inject_gp(vcpu, 0); - return; - } - } else if (is_paging(vcpu) && !is_pae(vcpu) && (cr4 & X86_CR4_PAE) - && !load_pdptrs(vcpu, vcpu->arch.cr3)) { - printk(KERN_DEBUG "set_cr4: #GP, pdptrs reserved bits\n"); - kvm_inject_gp(vcpu, 0); - return; - } - - if (cr4 & X86_CR4_VMXE) { - printk(KERN_DEBUG "set_cr4: #GP, setting VMXE\n"); - kvm_inject_gp(vcpu, 0); - return; - } - kvm_x86_ops->set_cr4(vcpu, cr4); - vcpu->arch.cr4 = cr4; - mutex_lock(&vcpu->kvm->lock); - kvm_mmu_reset_context(vcpu); - mutex_unlock(&vcpu->kvm->lock); -} -EXPORT_SYMBOL_GPL(set_cr4); - -void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3) -{ - if (cr3 == vcpu->arch.cr3 && !pdptrs_changed(vcpu)) { - kvm_mmu_flush_tlb(vcpu); - return; - } - - if (is_long_mode(vcpu)) { - if (cr3 & CR3_L_MODE_RESERVED_BITS) { - printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n"); - kvm_inject_gp(vcpu, 0); - return; - } - } else { - if (is_pae(vcpu)) { - if (cr3 & CR3_PAE_RESERVED_BITS) { - printk(KERN_DEBUG - "set_cr3: #GP, reserved bits\n"); - kvm_inject_gp(vcpu, 0); - return; - } - if (is_paging(vcpu) && !load_pdptrs(vcpu, cr3)) { - printk(KERN_DEBUG "set_cr3: #GP, pdptrs " - "reserved bits\n"); - kvm_inject_gp(vcpu, 0); - return; - } - } - /* - * We don't check reserved bits in nonpae mode, because - * this isn't enforced, and VMware depends on this. - */ - } - - mutex_lock(&vcpu->kvm->lock); - /* - * Does the new cr3 value map to physical memory? (Note, we - * catch an invalid cr3 even in real-mode, because it would - * cause trouble later on when we turn on paging anyway.) - * - * A real CPU would silently accept an invalid cr3 and would - * attempt to use it - with largely undefined (and often hard - * to debug) behavior on the guest side. - */ - if (unlikely(!gfn_to_memslot(vcpu->kvm, cr3 >> PAGE_SHIFT))) - kvm_inject_gp(vcpu, 0); - else { - vcpu->arch.cr3 = cr3; - vcpu->arch.mmu.new_cr3(vcpu); - } - mutex_unlock(&vcpu->kvm->lock); -} -EXPORT_SYMBOL_GPL(set_cr3); - -void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8) -{ - if (cr8 & CR8_RESERVED_BITS) { - printk(KERN_DEBUG "set_cr8: #GP, reserved bits 0x%lx\n", cr8); - kvm_inject_gp(vcpu, 0); - return; - } - if (irqchip_in_kernel(vcpu->kvm)) - kvm_lapic_set_tpr(vcpu, cr8); - else - vcpu->arch.cr8 = cr8; -} -EXPORT_SYMBOL_GPL(set_cr8); - -unsigned long get_cr8(struct kvm_vcpu *vcpu) -{ - if (irqchip_in_kernel(vcpu->kvm)) - return kvm_lapic_get_cr8(vcpu); - else - return vcpu->arch.cr8; -} -EXPORT_SYMBOL_GPL(get_cr8); - -/* - * List of msr numbers which we expose to userspace through KVM_GET_MSRS - * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST. - * - * This list is modified at module load time to reflect the - * capabilities of the host cpu. - */ -static u32 msrs_to_save[] = { - MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP, - MSR_K6_STAR, -#ifdef CONFIG_X86_64 - MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR, -#endif - MSR_IA32_TIME_STAMP_COUNTER, -}; - -static unsigned num_msrs_to_save; - -static u32 emulated_msrs[] = { - MSR_IA32_MISC_ENABLE, -}; - -#ifdef CONFIG_X86_64 - -static void set_efer(struct kvm_vcpu *vcpu, u64 efer) -{ - if (efer & EFER_RESERVED_BITS) { - printk(KERN_DEBUG "set_efer: 0x%llx #GP, reserved bits\n", - efer); - kvm_inject_gp(vcpu, 0); - return; - } - - if (is_paging(vcpu) - && (vcpu->arch.shadow_efer & EFER_LME) != (efer & EFER_LME)) { - printk(KERN_DEBUG "set_efer: #GP, change LME while paging\n"); - kvm_inject_gp(vcpu, 0); - return; - } - - kvm_x86_ops->set_efer(vcpu, efer); - - efer &= ~EFER_LMA; - efer |= vcpu->arch.shadow_efer & EFER_LMA; - - vcpu->arch.shadow_efer = efer; -} - -#endif - -/* - * Writes msr value into into the appropriate "register". - * Returns 0 on success, non-0 otherwise. - * Assumes vcpu_load() was already called. - */ -int kvm_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data) -{ - return kvm_x86_ops->set_msr(vcpu, msr_index, data); -} - -/* - * Adapt set_msr() to msr_io()'s calling convention - */ -static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data) -{ - return kvm_set_msr(vcpu, index, *data); -} - - -int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data) -{ - switch (msr) { -#ifdef CONFIG_X86_64 - case MSR_EFER: - set_efer(vcpu, data); - break; -#endif - case MSR_IA32_MC0_STATUS: - pr_unimpl(vcpu, "%s: MSR_IA32_MC0_STATUS 0x%llx, nop\n", - __FUNCTION__, data); - break; - case MSR_IA32_MCG_STATUS: - pr_unimpl(vcpu, "%s: MSR_IA32_MCG_STATUS 0x%llx, nop\n", - __FUNCTION__, data); - break; - case MSR_IA32_UCODE_REV: - case MSR_IA32_UCODE_WRITE: - case 0x200 ... 0x2ff: /* MTRRs */ - break; - case MSR_IA32_APICBASE: - kvm_set_apic_base(vcpu, data); - break; - case MSR_IA32_MISC_ENABLE: - vcpu->arch.ia32_misc_enable_msr = data; - break; - default: - pr_unimpl(vcpu, "unhandled wrmsr: 0x%x\n", msr); - return 1; - } - return 0; -} -EXPORT_SYMBOL_GPL(kvm_set_msr_common); - - -/* - * Reads an msr value (of 'msr_index') into 'pdata'. - * Returns 0 on success, non-0 otherwise. - * Assumes vcpu_load() was already called. - */ -int kvm_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata) -{ - return kvm_x86_ops->get_msr(vcpu, msr_index, pdata); -} - -int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata) -{ - u64 data; - - switch (msr) { - case 0xc0010010: /* SYSCFG */ - case 0xc0010015: /* HWCR */ - case MSR_IA32_PLATFORM_ID: - case MSR_IA32_P5_MC_ADDR: - case MSR_IA32_P5_MC_TYPE: - case MSR_IA32_MC0_CTL: - case MSR_IA32_MCG_STATUS: - case MSR_IA32_MCG_CAP: - case MSR_IA32_MC0_MISC: - case MSR_IA32_MC0_MISC+4: - case MSR_IA32_MC0_MISC+8: - case MSR_IA32_MC0_MISC+12: - case MSR_IA32_MC0_MISC+16: - case MSR_IA32_UCODE_REV: - case MSR_IA32_PERF_STATUS: - case MSR_IA32_EBL_CR_POWERON: - /* MTRR registers */ - case 0xfe: - case 0x200 ... 0x2ff: - data = 0; - break; - case 0xcd: /* fsb frequency */ - data = 3; - break; - case MSR_IA32_APICBASE: - data = kvm_get_apic_base(vcpu); - break; - case MSR_IA32_MISC_ENABLE: - data = vcpu->arch.ia32_misc_enable_msr; - break; -#ifdef CONFIG_X86_64 - case MSR_EFER: - data = vcpu->arch.shadow_efer; - break; -#endif - default: - pr_unimpl(vcpu, "unhandled rdmsr: 0x%x\n", msr); - return 1; - } - *pdata = data; - return 0; -} -EXPORT_SYMBOL_GPL(kvm_get_msr_common); - -/* - * Read or write a bunch of msrs. All parameters are kernel addresses. - * - * @return number of msrs set successfully. - */ -static int __msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs *msrs, - struct kvm_msr_entry *entries, - int (*do_msr)(struct kvm_vcpu *vcpu, - unsigned index, u64 *data)) -{ - int i; - - vcpu_load(vcpu); - - for (i = 0; i < msrs->nmsrs; ++i) - if (do_msr(vcpu, entries[i].index, &entries[i].data)) - break; - - vcpu_put(vcpu); - - return i; -} - -/* - * Read or write a bunch of msrs. Parameters are user addresses. - * - * @return number of msrs set successfully. - */ -static int msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs __user *user_msrs, - int (*do_msr)(struct kvm_vcpu *vcpu, - unsigned index, u64 *data), - int writeback) -{ - struct kvm_msrs msrs; - struct kvm_msr_entry *entries; - int r, n; - unsigned size; - - r = -EFAULT; - if (copy_from_user(&msrs, user_msrs, sizeof msrs)) - goto out; - - r = -E2BIG; - if (msrs.nmsrs >= MAX_IO_MSRS) - goto out; - - r = -ENOMEM; - size = sizeof(struct kvm_msr_entry) * msrs.nmsrs; - entries = vmalloc(size); - if (!entries) - goto out; - - r = -EFAULT; - if (copy_from_user(entries, user_msrs->entries, size)) - goto out_free; - - r = n = __msr_io(vcpu, &msrs, entries, do_msr); - if (r < 0) - goto out_free; - - r = -EFAULT; - if (writeback && copy_to_user(user_msrs->entries, entries, size)) - goto out_free; - - r = n; - -out_free: - vfree(entries); -out: - return r; -} - -/* - * Make sure that a cpu that is being hot-unplugged does not have any vcpus - * cached on it. - */ -void decache_vcpus_on_cpu(int cpu) -{ - struct kvm *vm; - struct kvm_vcpu *vcpu; - int i; - - spin_lock(&kvm_lock); - list_for_each_entry(vm, &vm_list, vm_list) - for (i = 0; i < KVM_MAX_VCPUS; ++i) { - vcpu = vm->vcpus[i]; - if (!vcpu) - continue; - /* - * If the vcpu is locked, then it is running on some - * other cpu and therefore it is not cached on the - * cpu in question. - * - * If it's not locked, check the last cpu it executed - * on. - */ - if (mutex_trylock(&vcpu->mutex)) { - if (vcpu->cpu == cpu) { - kvm_x86_ops->vcpu_decache(vcpu); - vcpu->cpu = -1; - } - mutex_unlock(&vcpu->mutex); - } - } - spin_unlock(&kvm_lock); -} - -int kvm_dev_ioctl_check_extension(long ext) -{ - int r; - - switch (ext) { - case KVM_CAP_IRQCHIP: - case KVM_CAP_HLT: - case KVM_CAP_MMU_SHADOW_CACHE_CONTROL: - case KVM_CAP_USER_MEMORY: - case KVM_CAP_SET_TSS_ADDR: - case KVM_CAP_EXT_CPUID: - r = 1; - break; - default: - r = 0; - break; - } - return r; - -} - -long kvm_arch_dev_ioctl(struct file *filp, - unsigned int ioctl, unsigned long arg) -{ - void __user *argp = (void __user *)arg; - long r; - - switch (ioctl) { - case KVM_GET_MSR_INDEX_LIST: { - struct kvm_msr_list __user *user_msr_list = argp; - struct kvm_msr_list msr_list; - unsigned n; - - r = -EFAULT; - if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list)) - goto out; - n = msr_list.nmsrs; - msr_list.nmsrs = num_msrs_to_save + ARRAY_SIZE(emulated_msrs); - if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list)) - goto out; - r = -E2BIG; - if (n < num_msrs_to_save) - goto out; - r = -EFAULT; - if (copy_to_user(user_msr_list->indices, &msrs_to_save, - num_msrs_to_save * sizeof(u32))) - goto out; - if (copy_to_user(user_msr_list->indices - + num_msrs_to_save * sizeof(u32), - &emulated_msrs, - ARRAY_SIZE(emulated_msrs) * sizeof(u32))) - goto out; - r = 0; - break; - } - default: - r = -EINVAL; - } -out: - return r; -} - -void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) -{ - kvm_x86_ops->vcpu_load(vcpu, cpu); -} - -void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu) -{ - kvm_x86_ops->vcpu_put(vcpu); - kvm_put_guest_fpu(vcpu); -} - -static int is_efer_nx(void) -{ - u64 efer; - - rdmsrl(MSR_EFER, efer); - return efer & EFER_NX; -} - -static void cpuid_fix_nx_cap(struct kvm_vcpu *vcpu) -{ - int i; - struct kvm_cpuid_entry2 *e, *entry; - - entry = NULL; - for (i = 0; i < vcpu->arch.cpuid_nent; ++i) { - e = &vcpu->arch.cpuid_entries[i]; - if (e->function == 0x80000001) { - entry = e; - break; - } - } - if (entry && (entry->edx & (1 << 20)) && !is_efer_nx()) { - entry->edx &= ~(1 << 20); - printk(KERN_INFO "kvm: guest NX capability removed\n"); - } -} - -/* when an old userspace process fills a new kernel module */ -static int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu, - struct kvm_cpuid *cpuid, - struct kvm_cpuid_entry __user *entries) -{ - int r, i; - struct kvm_cpuid_entry *cpuid_entries; - - r = -E2BIG; - if (cpuid->nent > KVM_MAX_CPUID_ENTRIES) - goto out; - r = -ENOMEM; - cpuid_entries = vmalloc(sizeof(struct kvm_cpuid_entry) * cpuid->nent); - if (!cpuid_entries) - goto out; - r = -EFAULT; - if (copy_from_user(cpuid_entries, entries, - cpuid->nent * sizeof(struct kvm_cpuid_entry))) - goto out_free; - for (i = 0; i < cpuid->nent; i++) { - vcpu->arch.cpuid_entries[i].function = cpuid_entries[i].function; - vcpu->arch.cpuid_entries[i].eax = cpuid_entries[i].eax; - vcpu->arch.cpuid_entries[i].ebx = cpuid_entries[i].ebx; - vcpu->arch.cpuid_entries[i].ecx = cpuid_entries[i].ecx; - vcpu->arch.cpuid_entries[i].edx = cpuid_entries[i].edx; - vcpu->arch.cpuid_entries[i].index = 0; - vcpu->arch.cpuid_entries[i].flags = 0; - vcpu->arch.cpuid_entries[i].padding[0] = 0; - vcpu->arch.cpuid_entries[i].padding[1] = 0; - vcpu->arch.cpuid_entries[i].padding[2] = 0; - } - vcpu->arch.cpuid_nent = cpuid->nent; - cpuid_fix_nx_cap(vcpu); - r = 0; - -out_free: - vfree(cpuid_entries); -out: - return r; -} - -static int kvm_vcpu_ioctl_set_cpuid2(struct kvm_vcpu *vcpu, - struct kvm_cpuid2 *cpuid, - struct kvm_cpuid_entry2 __user *entries) -{ - int r; - - r = -E2BIG; - if (cpuid->nent > KVM_MAX_CPUID_ENTRIES) - goto out; - r = -EFAULT; - if (copy_from_user(&vcpu->arch.cpuid_entries, entries, - cpuid->nent * sizeof(struct kvm_cpuid_entry2))) - goto out; - vcpu->arch.cpuid_nent = cpuid->nent; - return 0; - -out: - return r; -} - -static int kvm_vcpu_ioctl_get_cpuid2(struct kvm_vcpu *vcpu, - struct kvm_cpuid2 *cpuid, - struct kvm_cpuid_entry2 __user *entries) -{ - int r; - - r = -E2BIG; - if (cpuid->nent < vcpu->arch.cpuid_nent) - goto out; - r = -EFAULT; - if (copy_to_user(entries, &vcpu->arch.cpuid_entries, - vcpu->arch.cpuid_nent * sizeof(struct kvm_cpuid_entry2))) - goto out; - return 0; - -out: - cpuid->nent = vcpu->arch.cpuid_nent; - return r; -} - -static inline u32 bit(int bitno) -{ - return 1 << (bitno & 31); -} - -static void do_cpuid_1_ent(struct kvm_cpuid_entry2 *entry, u32 function, - u32 index) -{ - entry->function = function; - entry->index = index; - cpuid_count(entry->function, entry->index, - &entry->eax, &entry->ebx, &entry->ecx, &entry->edx); - entry->flags = 0; -} - -static void do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function, - u32 index, int *nent, int maxnent) -{ - const u32 kvm_supported_word0_x86_features = bit(X86_FEATURE_FPU) | - bit(X86_FEATURE_VME) | bit(X86_FEATURE_DE) | - bit(X86_FEATURE_PSE) | bit(X86_FEATURE_TSC) | - bit(X86_FEATURE_MSR) | bit(X86_FEATURE_PAE) | - bit(X86_FEATURE_CX8) | bit(X86_FEATURE_APIC) | - bit(X86_FEATURE_SEP) | bit(X86_FEATURE_PGE) | - bit(X86_FEATURE_CMOV) | bit(X86_FEATURE_PSE36) | - bit(X86_FEATURE_CLFLSH) | bit(X86_FEATURE_MMX) | - bit(X86_FEATURE_FXSR) | bit(X86_FEATURE_XMM) | - bit(X86_FEATURE_XMM2) | bit(X86_FEATURE_SELFSNOOP); - const u32 kvm_supported_word1_x86_features = bit(X86_FEATURE_FPU) | - bit(X86_FEATURE_VME) | bit(X86_FEATURE_DE) | - bit(X86_FEATURE_PSE) | bit(X86_FEATURE_TSC) | - bit(X86_FEATURE_MSR) | bit(X86_FEATURE_PAE) | - bit(X86_FEATURE_CX8) | bit(X86_FEATURE_APIC) | - bit(X86_FEATURE_PGE) | - bit(X86_FEATURE_CMOV) | bit(X86_FEATURE_PSE36) | - bit(X86_FEATURE_MMX) | bit(X86_FEATURE_FXSR) | - bit(X86_FEATURE_SYSCALL) | - (bit(X86_FEATURE_NX) && is_efer_nx()) | -#ifdef CONFIG_X86_64 - bit(X86_FEATURE_LM) | -#endif - bit(X86_FEATURE_MMXEXT) | - bit(X86_FEATURE_3DNOWEXT) | - bit(X86_FEATURE_3DNOW); - const u32 kvm_supported_word3_x86_features = - bit(X86_FEATURE_XMM3) | bit(X86_FEATURE_CX16); - const u32 kvm_supported_word6_x86_features = - bit(X86_FEATURE_LAHF_LM) | bit(X86_FEATURE_CMP_LEGACY); - - /* all func 2 cpuid_count() should be called on the same cpu */ - get_cpu(); - do_cpuid_1_ent(entry, function, index); - ++*nent; - - switch (function) { - case 0: - entry->eax = min(entry->eax, (u32)0xb); - break; - case 1: - entry->edx &= kvm_supported_word0_x86_features; - entry->ecx &= kvm_supported_word3_x86_features; - break; - /* function 2 entries are STATEFUL. That is, repeated cpuid commands - * may return different values. This forces us to get_cpu() before - * issuing the first command, and also to emulate this annoying behavior - * in kvm_emulate_cpuid() using KVM_CPUID_FLAG_STATE_READ_NEXT */ - case 2: { - int t, times = entry->eax & 0xff; - - entry->flags |= KVM_CPUID_FLAG_STATEFUL_FUNC; - for (t = 1; t < times && *nent < maxnent; ++t) { - do_cpuid_1_ent(&entry[t], function, 0); - entry[t].flags |= KVM_CPUID_FLAG_STATEFUL_FUNC; - ++*nent; - } - break; - } - /* function 4 and 0xb have additional index. */ - case 4: { - int index, cache_type; - - entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX; - /* read more entries until cache_type is zero */ - for (index = 1; *nent < maxnent; ++index) { - cache_type = entry[index - 1].eax & 0x1f; - if (!cache_type) - break; - do_cpuid_1_ent(&entry[index], function, index); - entry[index].flags |= - KVM_CPUID_FLAG_SIGNIFCANT_INDEX; - ++*nent; - } - break; - } - case 0xb: { - int index, level_type; - - entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX; - /* read more entries until level_type is zero */ - for (index = 1; *nent < maxnent; ++index) { - level_type = entry[index - 1].ecx & 0xff; - if (!level_type) - break; - do_cpuid_1_ent(&entry[index], function, index); - entry[index].flags |= - KVM_CPUID_FLAG_SIGNIFCANT_INDEX; - ++*nent; - } - break; - } - case 0x80000000: - entry->eax = min(entry->eax, 0x8000001a); - break; - case 0x80000001: - entry->edx &= kvm_supported_word1_x86_features; - entry->ecx &= kvm_supported_word6_x86_features; - break; - } - put_cpu(); -} - -static int kvm_vm_ioctl_get_supported_cpuid(struct kvm *kvm, - struct kvm_cpuid2 *cpuid, - struct kvm_cpuid_entry2 __user *entries) -{ - struct kvm_cpuid_entry2 *cpuid_entries; - int limit, nent = 0, r = -E2BIG; - u32 func; - - if (cpuid->nent < 1) - goto out; - r = -ENOMEM; - cpuid_entries = vmalloc(sizeof(struct kvm_cpuid_entry2) * cpuid->nent); - if (!cpuid_entries) - goto out; - - do_cpuid_ent(&cpuid_entries[0], 0, 0, &nent, cpuid->nent); - limit = cpuid_entries[0].eax; - for (func = 1; func <= limit && nent < cpuid->nent; ++func) - do_cpuid_ent(&cpuid_entries[nent], func, 0, - &nent, cpuid->nent); - r = -E2BIG; - if (nent >= cpuid->nent) - goto out_free; - - do_cpuid_ent(&cpuid_entries[nent], 0x80000000, 0, &nent, cpuid->nent); - limit = cpuid_entries[nent - 1].eax; - for (func = 0x80000001; func <= limit && nent < cpuid->nent; ++func) - do_cpuid_ent(&cpuid_entries[nent], func, 0, - &nent, cpuid->nent); - r = -EFAULT; - if (copy_to_user(entries, cpuid_entries, - nent * sizeof(struct kvm_cpuid_entry2))) - goto out_free; - cpuid->nent = nent; - r = 0; - -out_free: - vfree(cpuid_entries); -out: - return r; -} - -static int kvm_vcpu_ioctl_get_lapic(struct kvm_vcpu *vcpu, - struct kvm_lapic_state *s) -{ - vcpu_load(vcpu); - memcpy(s->regs, vcpu->arch.apic->regs, sizeof *s); - vcpu_put(vcpu); - - return 0; -} - -static int kvm_vcpu_ioctl_set_lapic(struct kvm_vcpu *vcpu, - struct kvm_lapic_state *s) -{ - vcpu_load(vcpu); - memcpy(vcpu->arch.apic->regs, s->regs, sizeof *s); - kvm_apic_post_state_restore(vcpu); - vcpu_put(vcpu); - - return 0; -} - -static int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, - struct kvm_interrupt *irq) -{ - if (irq->irq < 0 || irq->irq >= 256) - return -EINVAL; - if (irqchip_in_kernel(vcpu->kvm)) - return -ENXIO; - vcpu_load(vcpu); - - set_bit(irq->irq, vcpu->arch.irq_pending); - set_bit(irq->irq / BITS_PER_LONG, &vcpu->arch.irq_summary); - - vcpu_put(vcpu); - - return 0; -} - -long kvm_arch_vcpu_ioctl(struct file *filp, - unsigned int ioctl, unsigned long arg) -{ - struct kvm_vcpu *vcpu = filp->private_data; - void __user *argp = (void __user *)arg; - int r; - - switch (ioctl) { - case KVM_GET_LAPIC: { - struct kvm_lapic_state lapic; - - memset(&lapic, 0, sizeof lapic); - r = kvm_vcpu_ioctl_get_lapic(vcpu, &lapic); - if (r) - goto out; - r = -EFAULT; - if (copy_to_user(argp, &lapic, sizeof lapic)) - goto out; - r = 0; - break; - } - case KVM_SET_LAPIC: { - struct kvm_lapic_state lapic; - - r = -EFAULT; - if (copy_from_user(&lapic, argp, sizeof lapic)) - goto out; - r = kvm_vcpu_ioctl_set_lapic(vcpu, &lapic);; - if (r) - goto out; - r = 0; - break; - } - case KVM_INTERRUPT: { - struct kvm_interrupt irq; - - r = -EFAULT; - if (copy_from_user(&irq, argp, sizeof irq)) - goto out; - r = kvm_vcpu_ioctl_interrupt(vcpu, &irq); - if (r) - goto out; - r = 0; - break; - } - case KVM_SET_CPUID: { - struct kvm_cpuid __user *cpuid_arg = argp; - struct kvm_cpuid cpuid; - - r = -EFAULT; - if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid)) - goto out; - r = kvm_vcpu_ioctl_set_cpuid(vcpu, &cpuid, cpuid_arg->entries); - if (r) - goto out; - break; - } - case KVM_SET_CPUID2: { - struct kvm_cpuid2 __user *cpuid_arg = argp; - struct kvm_cpuid2 cpuid; - - r = -EFAULT; - if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid)) - goto out; - r = kvm_vcpu_ioctl_set_cpuid2(vcpu, &cpuid, - cpuid_arg->entries); - if (r) - goto out; - break; - } - case KVM_GET_CPUID2: { - struct kvm_cpuid2 __user *cpuid_arg = argp; - struct kvm_cpuid2 cpuid; - - r = -EFAULT; - if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid)) - goto out; - r = kvm_vcpu_ioctl_get_cpuid2(vcpu, &cpuid, - cpuid_arg->entries); - if (r) - goto out; - r = -EFAULT; - if (copy_to_user(cpuid_arg, &cpuid, sizeof cpuid)) - goto out; - r = 0; - break; - } - case KVM_GET_MSRS: - r = msr_io(vcpu, argp, kvm_get_msr, 1); - break; - case KVM_SET_MSRS: - r = msr_io(vcpu, argp, do_set_msr, 0); - break; - default: - r = -EINVAL; - } -out: - return r; -} - -static int kvm_vm_ioctl_set_tss_addr(struct kvm *kvm, unsigned long addr) -{ - int ret; - - if (addr > (unsigned int)(-3 * PAGE_SIZE)) - return -1; - ret = kvm_x86_ops->set_tss_addr(kvm, addr); - return ret; -} - -static int kvm_vm_ioctl_set_nr_mmu_pages(struct kvm *kvm, - u32 kvm_nr_mmu_pages) -{ - if (kvm_nr_mmu_pages < KVM_MIN_ALLOC_MMU_PAGES) - return -EINVAL; - - mutex_lock(&kvm->lock); - - kvm_mmu_change_mmu_pages(kvm, kvm_nr_mmu_pages); - kvm->arch.n_requested_mmu_pages = kvm_nr_mmu_pages; - - mutex_unlock(&kvm->lock); - return 0; -} - -static int kvm_vm_ioctl_get_nr_mmu_pages(struct kvm *kvm) -{ - return kvm->arch.n_alloc_mmu_pages; -} - -gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn) -{ - int i; - struct kvm_mem_alias *alias; - - for (i = 0; i < kvm->arch.naliases; ++i) { - alias = &kvm->arch.aliases[i]; - if (gfn >= alias->base_gfn - && gfn < alias->base_gfn + alias->npages) - return alias->target_gfn + gfn - alias->base_gfn; - } - return gfn; -} - -/* - * Set a new alias region. Aliases map a portion of physical memory into - * another portion. This is useful for memory windows, for example the PC - * VGA region. - */ -static int kvm_vm_ioctl_set_memory_alias(struct kvm *kvm, - struct kvm_memory_alias *alias) -{ - int r, n; - struct kvm_mem_alias *p; - - r = -EINVAL; - /* General sanity checks */ - if (alias->memory_size & (PAGE_SIZE - 1)) - goto out; - if (alias->guest_phys_addr & (PAGE_SIZE - 1)) - goto out; - if (alias->slot >= KVM_ALIAS_SLOTS) - goto out; - if (alias->guest_phys_addr + alias->memory_size - < alias->guest_phys_addr) - goto out; - if (alias->target_phys_addr + alias->memory_size - < alias->target_phys_addr) - goto out; - - mutex_lock(&kvm->lock); - - p = &kvm->arch.aliases[alias->slot]; - p->base_gfn = alias->guest_phys_addr >> PAGE_SHIFT; - p->npages = alias->memory_size >> PAGE_SHIFT; - p->target_gfn = alias->target_phys_addr >> PAGE_SHIFT; - - for (n = KVM_ALIAS_SLOTS; n > 0; --n) - if (kvm->arch.aliases[n - 1].npages) - break; - kvm->arch.naliases = n; - - kvm_mmu_zap_all(kvm); - - mutex_unlock(&kvm->lock); - - return 0; - -out: - return r; -} - -static int kvm_vm_ioctl_get_irqchip(struct kvm *kvm, struct kvm_irqchip *chip) -{ - int r; - - r = 0; - switch (chip->chip_id) { - case KVM_IRQCHIP_PIC_MASTER: - memcpy(&chip->chip.pic, - &pic_irqchip(kvm)->pics[0], - sizeof(struct kvm_pic_state)); - break; - case KVM_IRQCHIP_PIC_SLAVE: - memcpy(&chip->chip.pic, - &pic_irqchip(kvm)->pics[1], - sizeof(struct kvm_pic_state)); - break; - case KVM_IRQCHIP_IOAPIC: - memcpy(&chip->chip.ioapic, - ioapic_irqchip(kvm), - sizeof(struct kvm_ioapic_state)); - break; - default: - r = -EINVAL; - break; - } - return r; -} - -static int kvm_vm_ioctl_set_irqchip(struct kvm *kvm, struct kvm_irqchip *chip) -{ - int r; - - r = 0; - switch (chip->chip_id) { - case KVM_IRQCHIP_PIC_MASTER: - memcpy(&pic_irqchip(kvm)->pics[0], - &chip->chip.pic, - sizeof(struct kvm_pic_state)); - break; - case KVM_IRQCHIP_PIC_SLAVE: - memcpy(&pic_irqchip(kvm)->pics[1], - &chip->chip.pic, - sizeof(struct kvm_pic_state)); - break; - case KVM_IRQCHIP_IOAPIC: - memcpy(ioapic_irqchip(kvm), - &chip->chip.ioapic, - sizeof(struct kvm_ioapic_state)); - break; - default: - r = -EINVAL; - break; - } - kvm_pic_update_irq(pic_irqchip(kvm)); - return r; -} - -/* - * Get (and clear) the dirty memory log for a memory slot. - */ -int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, - struct kvm_dirty_log *log) -{ - int r; - int n; - struct kvm_memory_slot *memslot; - int is_dirty = 0; - - mutex_lock(&kvm->lock); - - r = kvm_get_dirty_log(kvm, log, &is_dirty); - if (r) - goto out; - - /* If nothing is dirty, don't bother messing with page tables. */ - if (is_dirty) { - kvm_mmu_slot_remove_write_access(kvm, log->slot); - kvm_flush_remote_tlbs(kvm); - memslot = &kvm->memslots[log->slot]; - n = ALIGN(memslot->npages, BITS_PER_LONG) / 8; - memset(memslot->dirty_bitmap, 0, n); - } - r = 0; -out: - mutex_unlock(&kvm->lock); - return r; -} - -long kvm_arch_vm_ioctl(struct file *filp, - unsigned int ioctl, unsigned long arg) -{ - struct kvm *kvm = filp->private_data; - void __user *argp = (void __user *)arg; - int r = -EINVAL; - - switch (ioctl) { - case KVM_SET_TSS_ADDR: - r = kvm_vm_ioctl_set_tss_addr(kvm, arg); - if (r < 0) - goto out; - break; - case KVM_SET_MEMORY_REGION: { - struct kvm_memory_region kvm_mem; - struct kvm_userspace_memory_region kvm_userspace_mem; - - r = -EFAULT; - if (copy_from_user(&kvm_mem, argp, sizeof kvm_mem)) - goto out; - kvm_userspace_mem.slot = kvm_mem.slot; - kvm_userspace_mem.flags = kvm_mem.flags; - kvm_userspace_mem.guest_phys_addr = kvm_mem.guest_phys_addr; - kvm_userspace_mem.memory_size = kvm_mem.memory_size; - r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 0); - if (r) - goto out; - break; - } - case KVM_SET_NR_MMU_PAGES: - r = kvm_vm_ioctl_set_nr_mmu_pages(kvm, arg); - if (r) - goto out; - break; - case KVM_GET_NR_MMU_PAGES: - r = kvm_vm_ioctl_get_nr_mmu_pages(kvm); - break; - case KVM_SET_MEMORY_ALIAS: { - struct kvm_memory_alias alias; - - r = -EFAULT; - if (copy_from_user(&alias, argp, sizeof alias)) - goto out; - r = kvm_vm_ioctl_set_memory_alias(kvm, &alias); - if (r) - goto out; - break; - } - case KVM_CREATE_IRQCHIP: - r = -ENOMEM; - kvm->arch.vpic = kvm_create_pic(kvm); - if (kvm->arch.vpic) { - r = kvm_ioapic_init(kvm); - if (r) { - kfree(kvm->arch.vpic); - kvm->arch.vpic = NULL; - goto out; - } - } else - goto out; - break; - case KVM_IRQ_LINE: { - struct kvm_irq_level irq_event; - - r = -EFAULT; - if (copy_from_user(&irq_event, argp, sizeof irq_event)) - goto out; - if (irqchip_in_kernel(kvm)) { - mutex_lock(&kvm->lock); - if (irq_event.irq < 16) - kvm_pic_set_irq(pic_irqchip(kvm), - irq_event.irq, - irq_event.level); - kvm_ioapic_set_irq(kvm->arch.vioapic, - irq_event.irq, - irq_event.level); - mutex_unlock(&kvm->lock); - r = 0; - } - break; - } - case KVM_GET_IRQCHIP: { - /* 0: PIC master, 1: PIC slave, 2: IOAPIC */ - struct kvm_irqchip chip; - - r = -EFAULT; - if (copy_from_user(&chip, argp, sizeof chip)) - goto out; - r = -ENXIO; - if (!irqchip_in_kernel(kvm)) - goto out; - r = kvm_vm_ioctl_get_irqchip(kvm, &chip); - if (r) - goto out; - r = -EFAULT; - if (copy_to_user(argp, &chip, sizeof chip)) - goto out; - r = 0; - break; - } - case KVM_SET_IRQCHIP: { - /* 0: PIC master, 1: PIC slave, 2: IOAPIC */ - struct kvm_irqchip chip; - - r = -EFAULT; - if (copy_from_user(&chip, argp, sizeof chip)) - goto out; - r = -ENXIO; - if (!irqchip_in_kernel(kvm)) - goto out; - r = kvm_vm_ioctl_set_irqchip(kvm, &chip); - if (r) - goto out; - r = 0; - break; - } - case KVM_GET_SUPPORTED_CPUID: { - struct kvm_cpuid2 __user *cpuid_arg = argp; - struct kvm_cpuid2 cpuid; - - r = -EFAULT; - if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid)) - goto out; - r = kvm_vm_ioctl_get_supported_cpuid(kvm, &cpuid, - cpuid_arg->entries); - if (r) - goto out; - - r = -EFAULT; - if (copy_to_user(cpuid_arg, &cpuid, sizeof cpuid)) - goto out; - r = 0; - break; - } - default: - ; - } -out: - return r; -} - -static void kvm_init_msr_list(void) -{ - u32 dummy[2]; - unsigned i, j; - - for (i = j = 0; i < ARRAY_SIZE(msrs_to_save); i++) { - if (rdmsr_safe(msrs_to_save[i], &dummy[0], &dummy[1]) < 0) - continue; - if (j < i) - msrs_to_save[j] = msrs_to_save[i]; - j++; - } - num_msrs_to_save = j; -} - -/* - * Only apic need an MMIO device hook, so shortcut now.. - */ -static struct kvm_io_device *vcpu_find_pervcpu_dev(struct kvm_vcpu *vcpu, - gpa_t addr) -{ - struct kvm_io_device *dev; - - if (vcpu->arch.apic) { - dev = &vcpu->arch.apic->dev; - if (dev->in_range(dev, addr)) - return dev; - } - return NULL; -} - - -static struct kvm_io_device *vcpu_find_mmio_dev(struct kvm_vcpu *vcpu, - gpa_t addr) -{ - struct kvm_io_device *dev; - - dev = vcpu_find_pervcpu_dev(vcpu, addr); - if (dev == NULL) - dev = kvm_io_bus_find_dev(&vcpu->kvm->mmio_bus, addr); - return dev; -} - -int emulator_read_std(unsigned long addr, - void *val, - unsigned int bytes, - struct kvm_vcpu *vcpu) -{ - void *data = val; - - while (bytes) { - gpa_t gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, addr); - unsigned offset = addr & (PAGE_SIZE-1); - unsigned tocopy = min(bytes, (unsigned)PAGE_SIZE - offset); - int ret; - - if (gpa == UNMAPPED_GVA) - return X86EMUL_PROPAGATE_FAULT; - ret = kvm_read_guest(vcpu->kvm, gpa, data, tocopy); - if (ret < 0) - return X86EMUL_UNHANDLEABLE; - - bytes -= tocopy; - data += tocopy; - addr += tocopy; - } - - return X86EMUL_CONTINUE; -} -EXPORT_SYMBOL_GPL(emulator_read_std); - -static int emulator_read_emulated(unsigned long addr, - void *val, - unsigned int bytes, - struct kvm_vcpu *vcpu) -{ - struct kvm_io_device *mmio_dev; - gpa_t gpa; - - if (vcpu->mmio_read_completed) { - memcpy(val, vcpu->mmio_data, bytes); - vcpu->mmio_read_completed = 0; - return X86EMUL_CONTINUE; - } - - gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, addr); - - /* For APIC access vmexit */ - if ((gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE) - goto mmio; - - if (emulator_read_std(addr, val, bytes, vcpu) - == X86EMUL_CONTINUE) - return X86EMUL_CONTINUE; - if (gpa == UNMAPPED_GVA) - return X86EMUL_PROPAGATE_FAULT; - -mmio: - /* - * Is this MMIO handled locally? - */ - mmio_dev = vcpu_find_mmio_dev(vcpu, gpa); - if (mmio_dev) { - kvm_iodevice_read(mmio_dev, gpa, bytes, val); - return X86EMUL_CONTINUE; - } - - vcpu->mmio_needed = 1; - vcpu->mmio_phys_addr = gpa; - vcpu->mmio_size = bytes; - vcpu->mmio_is_write = 0; - - return X86EMUL_UNHANDLEABLE; -} - -static int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa, - const void *val, int bytes) -{ - int ret; - - ret = kvm_write_guest(vcpu->kvm, gpa, val, bytes); - if (ret < 0) - return 0; - kvm_mmu_pte_write(vcpu, gpa, val, bytes); - return 1; -} - -static int emulator_write_emulated_onepage(unsigned long addr, - const void *val, - unsigned int bytes, - struct kvm_vcpu *vcpu) -{ - struct kvm_io_device *mmio_dev; - gpa_t gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, addr); - - if (gpa == UNMAPPED_GVA) { - kvm_inject_page_fault(vcpu, addr, 2); - return X86EMUL_PROPAGATE_FAULT; - } - - /* For APIC access vmexit */ - if ((gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE) - goto mmio; - - if (emulator_write_phys(vcpu, gpa, val, bytes)) - return X86EMUL_CONTINUE; - -mmio: - /* - * Is this MMIO handled locally? - */ - mmio_dev = vcpu_find_mmio_dev(vcpu, gpa); - if (mmio_dev) { - kvm_iodevice_write(mmio_dev, gpa, bytes, val); - return X86EMUL_CONTINUE; - } - - vcpu->mmio_needed = 1; - vcpu->mmio_phys_addr = gpa; - vcpu->mmio_size = bytes; - vcpu->mmio_is_write = 1; - memcpy(vcpu->mmio_data, val, bytes); - - return X86EMUL_CONTINUE; -} - -int emulator_write_emulated(unsigned long addr, - const void *val, - unsigned int bytes, - struct kvm_vcpu *vcpu) -{ - /* Crossing a page boundary? */ - if (((addr + bytes - 1) ^ addr) & PAGE_MASK) { - int rc, now; - - now = -addr & ~PAGE_MASK; - rc = emulator_write_emulated_onepage(addr, val, now, vcpu); - if (rc != X86EMUL_CONTINUE) - return rc; - addr += now; - val += now; - bytes -= now; - } - return emulator_write_emulated_onepage(addr, val, bytes, vcpu); -} -EXPORT_SYMBOL_GPL(emulator_write_emulated); - -static int emulator_cmpxchg_emulated(unsigned long addr, - const void *old, - const void *new, - unsigned int bytes, - struct kvm_vcpu *vcpu) -{ - static int reported; - - if (!reported) { - reported = 1; - printk(KERN_WARNING "kvm: emulating exchange as write\n"); - } -#ifndef CONFIG_X86_64 - /* guests cmpxchg8b have to be emulated atomically */ - if (bytes == 8) { - gpa_t gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, addr); - struct page *page; - char *addr; - u64 val; - - if (gpa == UNMAPPED_GVA || - (gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE) - goto emul_write; - - if (((gpa + bytes - 1) & PAGE_MASK) != (gpa & PAGE_MASK)) - goto emul_write; - - val = *(u64 *)new; - page = gfn_to_page(vcpu->kvm, gpa >> PAGE_SHIFT); - addr = kmap_atomic(page, KM_USER0); - set_64bit((u64 *)(addr + offset_in_page(gpa)), val); - kunmap_atomic(addr, KM_USER0); - kvm_release_page_dirty(page); - } -emul_write: -#endif - - return emulator_write_emulated(addr, new, bytes, vcpu); -} - -static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg) -{ - return kvm_x86_ops->get_segment_base(vcpu, seg); -} - -int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address) -{ - return X86EMUL_CONTINUE; -} - -int emulate_clts(struct kvm_vcpu *vcpu) -{ - kvm_x86_ops->set_cr0(vcpu, vcpu->arch.cr0 & ~X86_CR0_TS); - return X86EMUL_CONTINUE; -} - -int emulator_get_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long *dest) -{ - struct kvm_vcpu *vcpu = ctxt->vcpu; - - switch (dr) { - case 0 ... 3: - *dest = kvm_x86_ops->get_dr(vcpu, dr); - return X86EMUL_CONTINUE; - default: - pr_unimpl(vcpu, "%s: unexpected dr %u\n", __FUNCTION__, dr); - return X86EMUL_UNHANDLEABLE; - } -} - -int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long value) -{ - unsigned long mask = (ctxt->mode == X86EMUL_MODE_PROT64) ? ~0ULL : ~0U; - int exception; - - kvm_x86_ops->set_dr(ctxt->vcpu, dr, value & mask, &exception); - if (exception) { - /* FIXME: better handling */ - return X86EMUL_UNHANDLEABLE; - } - return X86EMUL_CONTINUE; -} - -void kvm_report_emulation_failure(struct kvm_vcpu *vcpu, const char *context) -{ - static int reported; - u8 opcodes[4]; - unsigned long rip = vcpu->arch.rip; - unsigned long rip_linear; - - rip_linear = rip + get_segment_base(vcpu, VCPU_SREG_CS); - - if (reported) - return; - - emulator_read_std(rip_linear, (void *)opcodes, 4, vcpu); - - printk(KERN_ERR "emulation failed (%s) rip %lx %02x %02x %02x %02x\n", - context, rip, opcodes[0], opcodes[1], opcodes[2], opcodes[3]); - reported = 1; -} -EXPORT_SYMBOL_GPL(kvm_report_emulation_failure); - -struct x86_emulate_ops emulate_ops = { - .read_std = emulator_read_std, - .read_emulated = emulator_read_emulated, - .write_emulated = emulator_write_emulated, - .cmpxchg_emulated = emulator_cmpxchg_emulated, -}; - -int emulate_instruction(struct kvm_vcpu *vcpu, - struct kvm_run *run, - unsigned long cr2, - u16 error_code, - int no_decode) -{ - int r; - - vcpu->arch.mmio_fault_cr2 = cr2; - kvm_x86_ops->cache_regs(vcpu); - - vcpu->mmio_is_write = 0; - vcpu->arch.pio.string = 0; - - if (!no_decode) { - int cs_db, cs_l; - kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l); - - vcpu->arch.emulate_ctxt.vcpu = vcpu; - vcpu->arch.emulate_ctxt.eflags = kvm_x86_ops->get_rflags(vcpu); - vcpu->arch.emulate_ctxt.mode = - (vcpu->arch.emulate_ctxt.eflags & X86_EFLAGS_VM) - ? X86EMUL_MODE_REAL : cs_l - ? X86EMUL_MODE_PROT64 : cs_db - ? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16; - - if (vcpu->arch.emulate_ctxt.mode == X86EMUL_MODE_PROT64) { - vcpu->arch.emulate_ctxt.cs_base = 0; - vcpu->arch.emulate_ctxt.ds_base = 0; - vcpu->arch.emulate_ctxt.es_base = 0; - vcpu->arch.emulate_ctxt.ss_base = 0; - } else { - vcpu->arch.emulate_ctxt.cs_base = - get_segment_base(vcpu, VCPU_SREG_CS); - vcpu->arch.emulate_ctxt.ds_base = - get_segment_base(vcpu, VCPU_SREG_DS); - vcpu->arch.emulate_ctxt.es_base = - get_segment_base(vcpu, VCPU_SREG_ES); - vcpu->arch.emulate_ctxt.ss_base = - get_segment_base(vcpu, VCPU_SREG_SS); - } - - vcpu->arch.emulate_ctxt.gs_base = - get_segment_base(vcpu, VCPU_SREG_GS); - vcpu->arch.emulate_ctxt.fs_base = - get_segment_base(vcpu, VCPU_SREG_FS); - - r = x86_decode_insn(&vcpu->arch.emulate_ctxt, &emulate_ops); - ++vcpu->stat.insn_emulation; - if (r) { - ++vcpu->stat.insn_emulation_fail; - if (kvm_mmu_unprotect_page_virt(vcpu, cr2)) - return EMULATE_DONE; - return EMULATE_FAIL; - } - } - - r = x86_emulate_insn(&vcpu->arch.emulate_ctxt, &emulate_ops); - - if (vcpu->arch.pio.string) - return EMULATE_DO_MMIO; - - if ((r || vcpu->mmio_is_write) && run) { - run->exit_reason = KVM_EXIT_MMIO; - run->mmio.phys_addr = vcpu->mmio_phys_addr; - memcpy(run->mmio.data, vcpu->mmio_data, 8); - run->mmio.len = vcpu->mmio_size; - run->mmio.is_write = vcpu->mmio_is_write; - } - - if (r) { - if (kvm_mmu_unprotect_page_virt(vcpu, cr2)) - return EMULATE_DONE; - if (!vcpu->mmio_needed) { - kvm_report_emulation_failure(vcpu, "mmio"); - return EMULATE_FAIL; - } - return EMULATE_DO_MMIO; - } - - kvm_x86_ops->decache_regs(vcpu); - kvm_x86_ops->set_rflags(vcpu, vcpu->arch.emulate_ctxt.eflags); - - if (vcpu->mmio_is_write) { - vcpu->mmio_needed = 0; - return EMULATE_DO_MMIO; - } - - return EMULATE_DONE; -} -EXPORT_SYMBOL_GPL(emulate_instruction); - -static void free_pio_guest_pages(struct kvm_vcpu *vcpu) -{ - int i; - - for (i = 0; i < ARRAY_SIZE(vcpu->arch.pio.guest_pages); ++i) - if (vcpu->arch.pio.guest_pages[i]) { - kvm_release_page_dirty(vcpu->arch.pio.guest_pages[i]); - vcpu->arch.pio.guest_pages[i] = NULL; - } -} - -static int pio_copy_data(struct kvm_vcpu *vcpu) -{ - void *p = vcpu->arch.pio_data; - void *q; - unsigned bytes; - int nr_pages = vcpu->arch.pio.guest_pages[1] ? 2 : 1; - - q = vmap(vcpu->arch.pio.guest_pages, nr_pages, VM_READ|VM_WRITE, - PAGE_KERNEL); - if (!q) { - free_pio_guest_pages(vcpu); - return -ENOMEM; - } - q += vcpu->arch.pio.guest_page_offset; - bytes = vcpu->arch.pio.size * vcpu->arch.pio.cur_count; - if (vcpu->arch.pio.in) - memcpy(q, p, bytes); - else - memcpy(p, q, bytes); - q -= vcpu->arch.pio.guest_page_offset; - vunmap(q); - free_pio_guest_pages(vcpu); - return 0; -} - -int complete_pio(struct kvm_vcpu *vcpu) -{ - struct kvm_pio_request *io = &vcpu->arch.pio; - long delta; - int r; - - kvm_x86_ops->cache_regs(vcpu); - - if (!io->string) { - if (io->in) - memcpy(&vcpu->arch.regs[VCPU_REGS_RAX], vcpu->arch.pio_data, - io->size); - } else { - if (io->in) { - r = pio_copy_data(vcpu); - if (r) { - kvm_x86_ops->cache_regs(vcpu); - return r; - } - } - - delta = 1; - if (io->rep) { - delta *= io->cur_count; - /* - * The size of the register should really depend on - * current address size. - */ - vcpu->arch.regs[VCPU_REGS_RCX] -= delta; - } - if (io->down) - delta = -delta; - delta *= io->size; - if (io->in) - vcpu->arch.regs[VCPU_REGS_RDI] += delta; - else - vcpu->arch.regs[VCPU_REGS_RSI] += delta; - } - - kvm_x86_ops->decache_regs(vcpu); - - io->count -= io->cur_count; - io->cur_count = 0; - - return 0; -} - -static void kernel_pio(struct kvm_io_device *pio_dev, - struct kvm_vcpu *vcpu, - void *pd) -{ - /* TODO: String I/O for in kernel device */ - - mutex_lock(&vcpu->kvm->lock); - if (vcpu->arch.pio.in) - kvm_iodevice_read(pio_dev, vcpu->arch.pio.port, - vcpu->arch.pio.size, - pd); - else - kvm_iodevice_write(pio_dev, vcpu->arch.pio.port, - vcpu->arch.pio.size, - pd); - mutex_unlock(&vcpu->kvm->lock); -} - -static void pio_string_write(struct kvm_io_device *pio_dev, - struct kvm_vcpu *vcpu) -{ - struct kvm_pio_request *io = &vcpu->arch.pio; - void *pd = vcpu->arch.pio_data; - int i; - - mutex_lock(&vcpu->kvm->lock); - for (i = 0; i < io->cur_count; i++) { - kvm_iodevice_write(pio_dev, io->port, - io->size, - pd); - pd += io->size; - } - mutex_unlock(&vcpu->kvm->lock); -} - -static struct kvm_io_device *vcpu_find_pio_dev(struct kvm_vcpu *vcpu, - gpa_t addr) -{ - return kvm_io_bus_find_dev(&vcpu->kvm->pio_bus, addr); -} - -int kvm_emulate_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in, - int size, unsigned port) -{ - struct kvm_io_device *pio_dev; - - vcpu->run->exit_reason = KVM_EXIT_IO; - vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT; - vcpu->run->io.size = vcpu->arch.pio.size = size; - vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE; - vcpu->run->io.count = vcpu->arch.pio.count = vcpu->arch.pio.cur_count = 1; - vcpu->run->io.port = vcpu->arch.pio.port = port; - vcpu->arch.pio.in = in; - vcpu->arch.pio.string = 0; - vcpu->arch.pio.down = 0; - vcpu->arch.pio.guest_page_offset = 0; - vcpu->arch.pio.rep = 0; - - kvm_x86_ops->cache_regs(vcpu); - memcpy(vcpu->arch.pio_data, &vcpu->arch.regs[VCPU_REGS_RAX], 4); - kvm_x86_ops->decache_regs(vcpu); - - kvm_x86_ops->skip_emulated_instruction(vcpu); - - pio_dev = vcpu_find_pio_dev(vcpu, port); - if (pio_dev) { - kernel_pio(pio_dev, vcpu, vcpu->arch.pio_data); - complete_pio(vcpu); - return 1; - } - return 0; -} -EXPORT_SYMBOL_GPL(kvm_emulate_pio); - -int kvm_emulate_pio_string(struct kvm_vcpu *vcpu, struct kvm_run *run, int in, - int size, unsigned long count, int down, - gva_t address, int rep, unsigned port) -{ - unsigned now, in_page; - int i, ret = 0; - int nr_pages = 1; - struct page *page; - struct kvm_io_device *pio_dev; - - vcpu->run->exit_reason = KVM_EXIT_IO; - vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT; - vcpu->run->io.size = vcpu->arch.pio.size = size; - vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE; - vcpu->run->io.count = vcpu->arch.pio.count = vcpu->arch.pio.cur_count = count; - vcpu->run->io.port = vcpu->arch.pio.port = port; - vcpu->arch.pio.in = in; - vcpu->arch.pio.string = 1; - vcpu->arch.pio.down = down; - vcpu->arch.pio.guest_page_offset = offset_in_page(address); - vcpu->arch.pio.rep = rep; - - if (!count) { - kvm_x86_ops->skip_emulated_instruction(vcpu); - return 1; - } - - if (!down) - in_page = PAGE_SIZE - offset_in_page(address); - else - in_page = offset_in_page(address) + size; - now = min(count, (unsigned long)in_page / size); - if (!now) { - /* - * String I/O straddles page boundary. Pin two guest pages - * so that we satisfy atomicity constraints. Do just one - * transaction to avoid complexity. - */ - nr_pages = 2; - now = 1; - } - if (down) { - /* - * String I/O in reverse. Yuck. Kill the guest, fix later. - */ - pr_unimpl(vcpu, "guest string pio down\n"); - kvm_inject_gp(vcpu, 0); - return 1; - } - vcpu->run->io.count = now; - vcpu->arch.pio.cur_count = now; - - if (vcpu->arch.pio.cur_count == vcpu->arch.pio.count) - kvm_x86_ops->skip_emulated_instruction(vcpu); - - for (i = 0; i < nr_pages; ++i) { - mutex_lock(&vcpu->kvm->lock); - page = gva_to_page(vcpu, address + i * PAGE_SIZE); - vcpu->arch.pio.guest_pages[i] = page; - mutex_unlock(&vcpu->kvm->lock); - if (!page) { - kvm_inject_gp(vcpu, 0); - free_pio_guest_pages(vcpu); - return 1; - } - } - - pio_dev = vcpu_find_pio_dev(vcpu, port); - if (!vcpu->arch.pio.in) { - /* string PIO write */ - ret = pio_copy_data(vcpu); - if (ret >= 0 && pio_dev) { - pio_string_write(pio_dev, vcpu); - complete_pio(vcpu); - if (vcpu->arch.pio.count == 0) - ret = 1; - } - } else if (pio_dev) - pr_unimpl(vcpu, "no string pio read support yet, " - "port %x size %d count %ld\n", - port, size, count); - - return ret; -} -EXPORT_SYMBOL_GPL(kvm_emulate_pio_string); - -int kvm_arch_init(void *opaque) -{ - int r; - struct kvm_x86_ops *ops = (struct kvm_x86_ops *)opaque; - - r = kvm_mmu_module_init(); - if (r) - goto out_fail; - - kvm_init_msr_list(); - - if (kvm_x86_ops) { - printk(KERN_ERR "kvm: already loaded the other module\n"); - r = -EEXIST; - goto out; - } - - if (!ops->cpu_has_kvm_support()) { - printk(KERN_ERR "kvm: no hardware support\n"); - r = -EOPNOTSUPP; - goto out; - } - if (ops->disabled_by_bios()) { - printk(KERN_ERR "kvm: disabled by bios\n"); - r = -EOPNOTSUPP; - goto out; - } - - kvm_x86_ops = ops; - kvm_mmu_set_nonpresent_ptes(0ull, 0ull); - return 0; - -out: - kvm_mmu_module_exit(); -out_fail: - return r; -} - -void kvm_arch_exit(void) -{ - kvm_x86_ops = NULL; - kvm_mmu_module_exit(); -} - -int kvm_emulate_halt(struct kvm_vcpu *vcpu) -{ - ++vcpu->stat.halt_exits; - if (irqchip_in_kernel(vcpu->kvm)) { - vcpu->arch.mp_state = VCPU_MP_STATE_HALTED; - kvm_vcpu_block(vcpu); - if (vcpu->arch.mp_state != VCPU_MP_STATE_RUNNABLE) - return -EINTR; - return 1; - } else { - vcpu->run->exit_reason = KVM_EXIT_HLT; - return 0; - } -} -EXPORT_SYMBOL_GPL(kvm_emulate_halt); - -int kvm_emulate_hypercall(struct kvm_vcpu *vcpu) -{ - unsigned long nr, a0, a1, a2, a3, ret; - - kvm_x86_ops->cache_regs(vcpu); - - nr = vcpu->arch.regs[VCPU_REGS_RAX]; - a0 = vcpu->arch.regs[VCPU_REGS_RBX]; - a1 = vcpu->arch.regs[VCPU_REGS_RCX]; - a2 = vcpu->arch.regs[VCPU_REGS_RDX]; - a3 = vcpu->arch.regs[VCPU_REGS_RSI]; - - if (!is_long_mode(vcpu)) { - nr &= 0xFFFFFFFF; - a0 &= 0xFFFFFFFF; - a1 &= 0xFFFFFFFF; - a2 &= 0xFFFFFFFF; - a3 &= 0xFFFFFFFF; - } - - switch (nr) { - default: - ret = -KVM_ENOSYS; - break; - } - vcpu->arch.regs[VCPU_REGS_RAX] = ret; - kvm_x86_ops->decache_regs(vcpu); - return 0; -} -EXPORT_SYMBOL_GPL(kvm_emulate_hypercall); - -int kvm_fix_hypercall(struct kvm_vcpu *vcpu) -{ - char instruction[3]; - int ret = 0; - - mutex_lock(&vcpu->kvm->lock); - - /* - * Blow out the MMU to ensure that no other VCPU has an active mapping - * to ensure that the updated hypercall appears atomically across all - * VCPUs. - */ - kvm_mmu_zap_all(vcpu->kvm); - - kvm_x86_ops->cache_regs(vcpu); - kvm_x86_ops->patch_hypercall(vcpu, instruction); - if (emulator_write_emulated(vcpu->arch.rip, instruction, 3, vcpu) - != X86EMUL_CONTINUE) - ret = -EFAULT; - - mutex_unlock(&vcpu->kvm->lock); - - return ret; -} - -static u64 mk_cr_64(u64 curr_cr, u32 new_val) -{ - return (curr_cr & ~((1ULL << 32) - 1)) | new_val; -} - -void realmode_lgdt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base) -{ - struct descriptor_table dt = { limit, base }; - - kvm_x86_ops->set_gdt(vcpu, &dt); -} - -void realmode_lidt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base) -{ - struct descriptor_table dt = { limit, base }; - - kvm_x86_ops->set_idt(vcpu, &dt); -} - -void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw, - unsigned long *rflags) -{ - lmsw(vcpu, msw); - *rflags = kvm_x86_ops->get_rflags(vcpu); -} - -unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr) -{ - kvm_x86_ops->decache_cr4_guest_bits(vcpu); - switch (cr) { - case 0: - return vcpu->arch.cr0; - case 2: - return vcpu->arch.cr2; - case 3: - return vcpu->arch.cr3; - case 4: - return vcpu->arch.cr4; - case 8: - return get_cr8(vcpu); - default: - vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr); - return 0; - } -} - -void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long val, - unsigned long *rflags) -{ - switch (cr) { - case 0: - set_cr0(vcpu, mk_cr_64(vcpu->arch.cr0, val)); - *rflags = kvm_x86_ops->get_rflags(vcpu); - break; - case 2: - vcpu->arch.cr2 = val; - break; - case 3: - set_cr3(vcpu, val); - break; - case 4: - set_cr4(vcpu, mk_cr_64(vcpu->arch.cr4, val)); - break; - case 8: - set_cr8(vcpu, val & 0xfUL); - break; - default: - vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr); - } -} - -static int move_to_next_stateful_cpuid_entry(struct kvm_vcpu *vcpu, int i) -{ - struct kvm_cpuid_entry2 *e = &vcpu->arch.cpuid_entries[i]; - int j, nent = vcpu->arch.cpuid_nent; - - e->flags &= ~KVM_CPUID_FLAG_STATE_READ_NEXT; - /* when no next entry is found, the current entry[i] is reselected */ - for (j = i + 1; j == i; j = (j + 1) % nent) { - struct kvm_cpuid_entry2 *ej = &vcpu->arch.cpuid_entries[j]; - if (ej->function == e->function) { - ej->flags |= KVM_CPUID_FLAG_STATE_READ_NEXT; - return j; - } - } - return 0; /* silence gcc, even though control never reaches here */ -} - -/* find an entry with matching function, matching index (if needed), and that - * should be read next (if it's stateful) */ -static int is_matching_cpuid_entry(struct kvm_cpuid_entry2 *e, - u32 function, u32 index) -{ - if (e->function != function) - return 0; - if ((e->flags & KVM_CPUID_FLAG_SIGNIFCANT_INDEX) && e->index != index) - return 0; - if ((e->flags & KVM_CPUID_FLAG_STATEFUL_FUNC) && - !(e->flags & KVM_CPUID_FLAG_STATE_READ_NEXT)) - return 0; - return 1; -} - -void kvm_emulate_cpuid(struct kvm_vcpu *vcpu) -{ - int i; - u32 function, index; - struct kvm_cpuid_entry2 *e, *best; - - kvm_x86_ops->cache_regs(vcpu); - function = vcpu->arch.regs[VCPU_REGS_RAX]; - index = vcpu->arch.regs[VCPU_REGS_RCX]; - vcpu->arch.regs[VCPU_REGS_RAX] = 0; - vcpu->arch.regs[VCPU_REGS_RBX] = 0; - vcpu->arch.regs[VCPU_REGS_RCX] = 0; - vcpu->arch.regs[VCPU_REGS_RDX] = 0; - best = NULL; - for (i = 0; i < vcpu->arch.cpuid_nent; ++i) { - e = &vcpu->arch.cpuid_entries[i]; - if (is_matching_cpuid_entry(e, function, index)) { - if (e->flags & KVM_CPUID_FLAG_STATEFUL_FUNC) - move_to_next_stateful_cpuid_entry(vcpu, i); - best = e; - break; - } - /* - * Both basic or both extended? - */ - if (((e->function ^ function) & 0x80000000) == 0) - if (!best || e->function > best->function) - best = e; - } - if (best) { - vcpu->arch.regs[VCPU_REGS_RAX] = best->eax; - vcpu->arch.regs[VCPU_REGS_RBX] = best->ebx; - vcpu->arch.regs[VCPU_REGS_RCX] = best->ecx; - vcpu->arch.regs[VCPU_REGS_RDX] = best->edx; - } - kvm_x86_ops->decache_regs(vcpu); - kvm_x86_ops->skip_emulated_instruction(vcpu); -} -EXPORT_SYMBOL_GPL(kvm_emulate_cpuid); - -/* - * Check if userspace requested an interrupt window, and that the - * interrupt window is open. - * - * No need to exit to userspace if we already have an interrupt queued. - */ -static int dm_request_for_irq_injection(struct kvm_vcpu *vcpu, - struct kvm_run *kvm_run) -{ - return (!vcpu->arch.irq_summary && - kvm_run->request_interrupt_window && - vcpu->arch.interrupt_window_open && - (kvm_x86_ops->get_rflags(vcpu) & X86_EFLAGS_IF)); -} - -static void post_kvm_run_save(struct kvm_vcpu *vcpu, - struct kvm_run *kvm_run) -{ - kvm_run->if_flag = (kvm_x86_ops->get_rflags(vcpu) & X86_EFLAGS_IF) != 0; - kvm_run->cr8 = get_cr8(vcpu); - kvm_run->apic_base = kvm_get_apic_base(vcpu); - if (irqchip_in_kernel(vcpu->kvm)) - kvm_run->ready_for_interrupt_injection = 1; - else - kvm_run->ready_for_interrupt_injection = - (vcpu->arch.interrupt_window_open && - vcpu->arch.irq_summary == 0); -} - -static int __vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) -{ - int r; - - if (unlikely(vcpu->arch.mp_state == VCPU_MP_STATE_SIPI_RECEIVED)) { - pr_debug("vcpu %d received sipi with vector # %x\n", - vcpu->vcpu_id, vcpu->arch.sipi_vector); - kvm_lapic_reset(vcpu); - r = kvm_x86_ops->vcpu_reset(vcpu); - if (r) - return r; - vcpu->arch.mp_state = VCPU_MP_STATE_RUNNABLE; - } - -preempted: - if (vcpu->guest_debug.enabled) - kvm_x86_ops->guest_debug_pre(vcpu); - -again: - r = kvm_mmu_reload(vcpu); - if (unlikely(r)) - goto out; - - kvm_inject_pending_timer_irqs(vcpu); - - preempt_disable(); - - kvm_x86_ops->prepare_guest_switch(vcpu); - kvm_load_guest_fpu(vcpu); - - local_irq_disable(); - - if (signal_pending(current)) { - local_irq_enable(); - preempt_enable(); - r = -EINTR; - kvm_run->exit_reason = KVM_EXIT_INTR; - ++vcpu->stat.signal_exits; - goto out; - } - - if (vcpu->arch.exception.pending) - __queue_exception(vcpu); - else if (irqchip_in_kernel(vcpu->kvm)) - kvm_x86_ops->inject_pending_irq(vcpu); - else - kvm_x86_ops->inject_pending_vectors(vcpu, kvm_run); - - vcpu->guest_mode = 1; - kvm_guest_enter(); - - if (vcpu->requests) - if (test_and_clear_bit(KVM_REQ_TLB_FLUSH, &vcpu->requests)) - kvm_x86_ops->tlb_flush(vcpu); - - kvm_x86_ops->run(vcpu, kvm_run); - - vcpu->guest_mode = 0; - local_irq_enable(); - - ++vcpu->stat.exits; - - /* - * We must have an instruction between local_irq_enable() and - * kvm_guest_exit(), so the timer interrupt isn't delayed by - * the interrupt shadow. The stat.exits increment will do nicely. - * But we need to prevent reordering, hence this barrier(): - */ - barrier(); - - kvm_guest_exit(); - - preempt_enable(); - - /* - * Profile KVM exit RIPs: - */ - if (unlikely(prof_on == KVM_PROFILING)) { - kvm_x86_ops->cache_regs(vcpu); - profile_hit(KVM_PROFILING, (void *)vcpu->arch.rip); - } - - if (vcpu->arch.exception.pending && kvm_x86_ops->exception_injected(vcpu)) - vcpu->arch.exception.pending = false; - - r = kvm_x86_ops->handle_exit(kvm_run, vcpu); - - if (r > 0) { - if (dm_request_for_irq_injection(vcpu, kvm_run)) { - r = -EINTR; - kvm_run->exit_reason = KVM_EXIT_INTR; - ++vcpu->stat.request_irq_exits; - goto out; - } - if (!need_resched()) - goto again; - } - -out: - if (r > 0) { - kvm_resched(vcpu); - goto preempted; - } - - post_kvm_run_save(vcpu, kvm_run); - - return r; -} - -int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) -{ - int r; - sigset_t sigsaved; - - vcpu_load(vcpu); - - if (unlikely(vcpu->arch.mp_state == VCPU_MP_STATE_UNINITIALIZED)) { - kvm_vcpu_block(vcpu); - vcpu_put(vcpu); - return -EAGAIN; - } - - if (vcpu->sigset_active) - sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved); - - /* re-sync apic's tpr */ - if (!irqchip_in_kernel(vcpu->kvm)) - set_cr8(vcpu, kvm_run->cr8); - - if (vcpu->arch.pio.cur_count) { - r = complete_pio(vcpu); - if (r) - goto out; - } -#if CONFIG_HAS_IOMEM - if (vcpu->mmio_needed) { - memcpy(vcpu->mmio_data, kvm_run->mmio.data, 8); - vcpu->mmio_read_completed = 1; - vcpu->mmio_needed = 0; - r = emulate_instruction(vcpu, kvm_run, - vcpu->arch.mmio_fault_cr2, 0, 1); - if (r == EMULATE_DO_MMIO) { - /* - * Read-modify-write. Back to userspace. - */ - r = 0; - goto out; - } - } -#endif - if (kvm_run->exit_reason == KVM_EXIT_HYPERCALL) { - kvm_x86_ops->cache_regs(vcpu); - vcpu->arch.regs[VCPU_REGS_RAX] = kvm_run->hypercall.ret; - kvm_x86_ops->decache_regs(vcpu); - } - - r = __vcpu_run(vcpu, kvm_run); - -out: - if (vcpu->sigset_active) - sigprocmask(SIG_SETMASK, &sigsaved, NULL); - - vcpu_put(vcpu); - return r; -} - -int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) -{ - vcpu_load(vcpu); - - kvm_x86_ops->cache_regs(vcpu); - - regs->rax = vcpu->arch.regs[VCPU_REGS_RAX]; - regs->rbx = vcpu->arch.regs[VCPU_REGS_RBX]; - regs->rcx = vcpu->arch.regs[VCPU_REGS_RCX]; - regs->rdx = vcpu->arch.regs[VCPU_REGS_RDX]; - regs->rsi = vcpu->arch.regs[VCPU_REGS_RSI]; - regs->rdi = vcpu->arch.regs[VCPU_REGS_RDI]; - regs->rsp = vcpu->arch.regs[VCPU_REGS_RSP]; - regs->rbp = vcpu->arch.regs[VCPU_REGS_RBP]; -#ifdef CONFIG_X86_64 - regs->r8 = vcpu->arch.regs[VCPU_REGS_R8]; - regs->r9 = vcpu->arch.regs[VCPU_REGS_R9]; - regs->r10 = vcpu->arch.regs[VCPU_REGS_R10]; - regs->r11 = vcpu->arch.regs[VCPU_REGS_R11]; - regs->r12 = vcpu->arch.regs[VCPU_REGS_R12]; - regs->r13 = vcpu->arch.regs[VCPU_REGS_R13]; - regs->r14 = vcpu->arch.regs[VCPU_REGS_R14]; - regs->r15 = vcpu->arch.regs[VCPU_REGS_R15]; -#endif - - regs->rip = vcpu->arch.rip; - regs->rflags = kvm_x86_ops->get_rflags(vcpu); - - /* - * Don't leak debug flags in case they were set for guest debugging - */ - if (vcpu->guest_debug.enabled && vcpu->guest_debug.singlestep) - regs->rflags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF); - - vcpu_put(vcpu); - - return 0; -} - -int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) -{ - vcpu_load(vcpu); - - vcpu->arch.regs[VCPU_REGS_RAX] = regs->rax; - vcpu->arch.regs[VCPU_REGS_RBX] = regs->rbx; - vcpu->arch.regs[VCPU_REGS_RCX] = regs->rcx; - vcpu->arch.regs[VCPU_REGS_RDX] = regs->rdx; - vcpu->arch.regs[VCPU_REGS_RSI] = regs->rsi; - vcpu->arch.regs[VCPU_REGS_RDI] = regs->rdi; - vcpu->arch.regs[VCPU_REGS_RSP] = regs->rsp; - vcpu->arch.regs[VCPU_REGS_RBP] = regs->rbp; -#ifdef CONFIG_X86_64 - vcpu->arch.regs[VCPU_REGS_R8] = regs->r8; - vcpu->arch.regs[VCPU_REGS_R9] = regs->r9; - vcpu->arch.regs[VCPU_REGS_R10] = regs->r10; - vcpu->arch.regs[VCPU_REGS_R11] = regs->r11; - vcpu->arch.regs[VCPU_REGS_R12] = regs->r12; - vcpu->arch.regs[VCPU_REGS_R13] = regs->r13; - vcpu->arch.regs[VCPU_REGS_R14] = regs->r14; - vcpu->arch.regs[VCPU_REGS_R15] = regs->r15; -#endif - - vcpu->arch.rip = regs->rip; - kvm_x86_ops->set_rflags(vcpu, regs->rflags); - - kvm_x86_ops->decache_regs(vcpu); - - vcpu_put(vcpu); - - return 0; -} - -static void get_segment(struct kvm_vcpu *vcpu, - struct kvm_segment *var, int seg) -{ - return kvm_x86_ops->get_segment(vcpu, var, seg); -} - -void kvm_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l) -{ - struct kvm_segment cs; - - get_segment(vcpu, &cs, VCPU_SREG_CS); - *db = cs.db; - *l = cs.l; -} -EXPORT_SYMBOL_GPL(kvm_get_cs_db_l_bits); - -int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu, - struct kvm_sregs *sregs) -{ - struct descriptor_table dt; - int pending_vec; - - vcpu_load(vcpu); - - get_segment(vcpu, &sregs->cs, VCPU_SREG_CS); - get_segment(vcpu, &sregs->ds, VCPU_SREG_DS); - get_segment(vcpu, &sregs->es, VCPU_SREG_ES); - get_segment(vcpu, &sregs->fs, VCPU_SREG_FS); - get_segment(vcpu, &sregs->gs, VCPU_SREG_GS); - get_segment(vcpu, &sregs->ss, VCPU_SREG_SS); - - get_segment(vcpu, &sregs->tr, VCPU_SREG_TR); - get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR); - - kvm_x86_ops->get_idt(vcpu, &dt); - sregs->idt.limit = dt.limit; - sregs->idt.base = dt.base; - kvm_x86_ops->get_gdt(vcpu, &dt); - sregs->gdt.limit = dt.limit; - sregs->gdt.base = dt.base; - - kvm_x86_ops->decache_cr4_guest_bits(vcpu); - sregs->cr0 = vcpu->arch.cr0; - sregs->cr2 = vcpu->arch.cr2; - sregs->cr3 = vcpu->arch.cr3; - sregs->cr4 = vcpu->arch.cr4; - sregs->cr8 = get_cr8(vcpu); - sregs->efer = vcpu->arch.shadow_efer; - sregs->apic_base = kvm_get_apic_base(vcpu); - - if (irqchip_in_kernel(vcpu->kvm)) { - memset(sregs->interrupt_bitmap, 0, - sizeof sregs->interrupt_bitmap); - pending_vec = kvm_x86_ops->get_irq(vcpu); - if (pending_vec >= 0) - set_bit(pending_vec, - (unsigned long *)sregs->interrupt_bitmap); - } else - memcpy(sregs->interrupt_bitmap, vcpu->arch.irq_pending, - sizeof sregs->interrupt_bitmap); - - vcpu_put(vcpu); - - return 0; -} - -static void set_segment(struct kvm_vcpu *vcpu, - struct kvm_segment *var, int seg) -{ - return kvm_x86_ops->set_segment(vcpu, var, seg); -} - -int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu, - struct kvm_sregs *sregs) -{ - int mmu_reset_needed = 0; - int i, pending_vec, max_bits; - struct descriptor_table dt; - - vcpu_load(vcpu); - - dt.limit = sregs->idt.limit; - dt.base = sregs->idt.base; - kvm_x86_ops->set_idt(vcpu, &dt); - dt.limit = sregs->gdt.limit; - dt.base = sregs->gdt.base; - kvm_x86_ops->set_gdt(vcpu, &dt); - - vcpu->arch.cr2 = sregs->cr2; - mmu_reset_needed |= vcpu->arch.cr3 != sregs->cr3; - vcpu->arch.cr3 = sregs->cr3; - - set_cr8(vcpu, sregs->cr8); - - mmu_reset_needed |= vcpu->arch.shadow_efer != sregs->efer; -#ifdef CONFIG_X86_64 - kvm_x86_ops->set_efer(vcpu, sregs->efer); -#endif - kvm_set_apic_base(vcpu, sregs->apic_base); - - kvm_x86_ops->decache_cr4_guest_bits(vcpu); - - mmu_reset_needed |= vcpu->arch.cr0 != sregs->cr0; - vcpu->arch.cr0 = sregs->cr0; - kvm_x86_ops->set_cr0(vcpu, sregs->cr0); - - mmu_reset_needed |= vcpu->arch.cr4 != sregs->cr4; - kvm_x86_ops->set_cr4(vcpu, sregs->cr4); - if (!is_long_mode(vcpu) && is_pae(vcpu)) - load_pdptrs(vcpu, vcpu->arch.cr3); - - if (mmu_reset_needed) - kvm_mmu_reset_context(vcpu); - - if (!irqchip_in_kernel(vcpu->kvm)) { - memcpy(vcpu->arch.irq_pending, sregs->interrupt_bitmap, - sizeof vcpu->arch.irq_pending); - vcpu->arch.irq_summary = 0; - for (i = 0; i < ARRAY_SIZE(vcpu->arch.irq_pending); ++i) - if (vcpu->arch.irq_pending[i]) - __set_bit(i, &vcpu->arch.irq_summary); - } else { - max_bits = (sizeof sregs->interrupt_bitmap) << 3; - pending_vec = find_first_bit( - (const unsigned long *)sregs->interrupt_bitmap, - max_bits); - /* Only pending external irq is handled here */ - if (pending_vec < max_bits) { - kvm_x86_ops->set_irq(vcpu, pending_vec); - pr_debug("Set back pending irq %d\n", - pending_vec); - } - } - - set_segment(vcpu, &sregs->cs, VCPU_SREG_CS); - set_segment(vcpu, &sregs->ds, VCPU_SREG_DS); - set_segment(vcpu, &sregs->es, VCPU_SREG_ES); - set_segment(vcpu, &sregs->fs, VCPU_SREG_FS); - set_segment(vcpu, &sregs->gs, VCPU_SREG_GS); - set_segment(vcpu, &sregs->ss, VCPU_SREG_SS); - - set_segment(vcpu, &sregs->tr, VCPU_SREG_TR); - set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR); - - vcpu_put(vcpu); - - return 0; -} - -int kvm_arch_vcpu_ioctl_debug_guest(struct kvm_vcpu *vcpu, - struct kvm_debug_guest *dbg) -{ - int r; - - vcpu_load(vcpu); - - r = kvm_x86_ops->set_guest_debug(vcpu, dbg); - - vcpu_put(vcpu); - - return r; -} - -/* - * fxsave fpu state. Taken from x86_64/processor.h. To be killed when - * we have asm/x86/processor.h - */ -struct fxsave { - u16 cwd; - u16 swd; - u16 twd; - u16 fop; - u64 rip; - u64 rdp; - u32 mxcsr; - u32 mxcsr_mask; - u32 st_space[32]; /* 8*16 bytes for each FP-reg = 128 bytes */ -#ifdef CONFIG_X86_64 - u32 xmm_space[64]; /* 16*16 bytes for each XMM-reg = 256 bytes */ -#else - u32 xmm_space[32]; /* 8*16 bytes for each XMM-reg = 128 bytes */ -#endif -}; - -/* - * Translate a guest virtual address to a guest physical address. - */ -int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu, - struct kvm_translation *tr) -{ - unsigned long vaddr = tr->linear_address; - gpa_t gpa; - - vcpu_load(vcpu); - mutex_lock(&vcpu->kvm->lock); - gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, vaddr); - tr->physical_address = gpa; - tr->valid = gpa != UNMAPPED_GVA; - tr->writeable = 1; - tr->usermode = 0; - mutex_unlock(&vcpu->kvm->lock); - vcpu_put(vcpu); - - return 0; -} - -int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) -{ - struct fxsave *fxsave = (struct fxsave *)&vcpu->arch.guest_fx_image; - - vcpu_load(vcpu); - - memcpy(fpu->fpr, fxsave->st_space, 128); - fpu->fcw = fxsave->cwd; - fpu->fsw = fxsave->swd; - fpu->ftwx = fxsave->twd; - fpu->last_opcode = fxsave->fop; - fpu->last_ip = fxsave->rip; - fpu->last_dp = fxsave->rdp; - memcpy(fpu->xmm, fxsave->xmm_space, sizeof fxsave->xmm_space); - - vcpu_put(vcpu); - - return 0; -} - -int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) -{ - struct fxsave *fxsave = (struct fxsave *)&vcpu->arch.guest_fx_image; - - vcpu_load(vcpu); - - memcpy(fxsave->st_space, fpu->fpr, 128); - fxsave->cwd = fpu->fcw; - fxsave->swd = fpu->fsw; - fxsave->twd = fpu->ftwx; - fxsave->fop = fpu->last_opcode; - fxsave->rip = fpu->last_ip; - fxsave->rdp = fpu->last_dp; - memcpy(fxsave->xmm_space, fpu->xmm, sizeof fxsave->xmm_space); - - vcpu_put(vcpu); - - return 0; -} - -void fx_init(struct kvm_vcpu *vcpu) -{ - unsigned after_mxcsr_mask; - - /* Initialize guest FPU by resetting ours and saving into guest's */ - preempt_disable(); - fx_save(&vcpu->arch.host_fx_image); - fpu_init(); - fx_save(&vcpu->arch.guest_fx_image); - fx_restore(&vcpu->arch.host_fx_image); - preempt_enable(); - - vcpu->arch.cr0 |= X86_CR0_ET; - after_mxcsr_mask = offsetof(struct i387_fxsave_struct, st_space); - vcpu->arch.guest_fx_image.mxcsr = 0x1f80; - memset((void *)&vcpu->arch.guest_fx_image + after_mxcsr_mask, - 0, sizeof(struct i387_fxsave_struct) - after_mxcsr_mask); -} -EXPORT_SYMBOL_GPL(fx_init); - -void kvm_load_guest_fpu(struct kvm_vcpu *vcpu) -{ - if (!vcpu->fpu_active || vcpu->guest_fpu_loaded) - return; - - vcpu->guest_fpu_loaded = 1; - fx_save(&vcpu->arch.host_fx_image); - fx_restore(&vcpu->arch.guest_fx_image); -} -EXPORT_SYMBOL_GPL(kvm_load_guest_fpu); - -void kvm_put_guest_fpu(struct kvm_vcpu *vcpu) -{ - if (!vcpu->guest_fpu_loaded) - return; - - vcpu->guest_fpu_loaded = 0; - fx_save(&vcpu->arch.guest_fx_image); - fx_restore(&vcpu->arch.host_fx_image); - ++vcpu->stat.fpu_reload; -} -EXPORT_SYMBOL_GPL(kvm_put_guest_fpu); - -void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu) -{ - kvm_x86_ops->vcpu_free(vcpu); -} - -struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, - unsigned int id) -{ - return kvm_x86_ops->vcpu_create(kvm, id); -} - -int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu) -{ - int r; - - /* We do fxsave: this must be aligned. */ - BUG_ON((unsigned long)&vcpu->arch.host_fx_image & 0xF); - - vcpu_load(vcpu); - r = kvm_arch_vcpu_reset(vcpu); - if (r == 0) - r = kvm_mmu_setup(vcpu); - vcpu_put(vcpu); - if (r < 0) - goto free_vcpu; - - return 0; -free_vcpu: - kvm_x86_ops->vcpu_free(vcpu); - return r; -} - -void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu) -{ - vcpu_load(vcpu); - kvm_mmu_unload(vcpu); - vcpu_put(vcpu); - - kvm_x86_ops->vcpu_free(vcpu); -} - -int kvm_arch_vcpu_reset(struct kvm_vcpu *vcpu) -{ - return kvm_x86_ops->vcpu_reset(vcpu); -} - -void kvm_arch_hardware_enable(void *garbage) -{ - kvm_x86_ops->hardware_enable(garbage); -} - -void kvm_arch_hardware_disable(void *garbage) -{ - kvm_x86_ops->hardware_disable(garbage); -} - -int kvm_arch_hardware_setup(void) -{ - return kvm_x86_ops->hardware_setup(); -} - -void kvm_arch_hardware_unsetup(void) -{ - kvm_x86_ops->hardware_unsetup(); -} - -void kvm_arch_check_processor_compat(void *rtn) -{ - kvm_x86_ops->check_processor_compatibility(rtn); -} - -int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu) -{ - struct page *page; - struct kvm *kvm; - int r; - - BUG_ON(vcpu->kvm == NULL); - kvm = vcpu->kvm; - - vcpu->arch.mmu.root_hpa = INVALID_PAGE; - if (!irqchip_in_kernel(kvm) || vcpu->vcpu_id == 0) - vcpu->arch.mp_state = VCPU_MP_STATE_RUNNABLE; - else - vcpu->arch.mp_state = VCPU_MP_STATE_UNINITIALIZED; - - page = alloc_page(GFP_KERNEL | __GFP_ZERO); - if (!page) { - r = -ENOMEM; - goto fail; - } - vcpu->arch.pio_data = page_address(page); - - r = kvm_mmu_create(vcpu); - if (r < 0) - goto fail_free_pio_data; - - if (irqchip_in_kernel(kvm)) { - r = kvm_create_lapic(vcpu); - if (r < 0) - goto fail_mmu_destroy; - } - - return 0; - -fail_mmu_destroy: - kvm_mmu_destroy(vcpu); -fail_free_pio_data: - free_page((unsigned long)vcpu->arch.pio_data); -fail: - return r; -} - -void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) -{ - kvm_free_lapic(vcpu); - kvm_mmu_destroy(vcpu); - free_page((unsigned long)vcpu->arch.pio_data); -} - -struct kvm *kvm_arch_create_vm(void) -{ - struct kvm *kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL); - - if (!kvm) - return ERR_PTR(-ENOMEM); - - INIT_LIST_HEAD(&kvm->arch.active_mmu_pages); - - return kvm; -} - -static void kvm_unload_vcpu_mmu(struct kvm_vcpu *vcpu) -{ - vcpu_load(vcpu); - kvm_mmu_unload(vcpu); - vcpu_put(vcpu); -} - -static void kvm_free_vcpus(struct kvm *kvm) -{ - unsigned int i; - - /* - * Unpin any mmu pages first. - */ - for (i = 0; i < KVM_MAX_VCPUS; ++i) - if (kvm->vcpus[i]) - kvm_unload_vcpu_mmu(kvm->vcpus[i]); - for (i = 0; i < KVM_MAX_VCPUS; ++i) { - if (kvm->vcpus[i]) { - kvm_arch_vcpu_free(kvm->vcpus[i]); - kvm->vcpus[i] = NULL; - } - } - -} - -void kvm_arch_destroy_vm(struct kvm *kvm) -{ - kfree(kvm->arch.vpic); - kfree(kvm->arch.vioapic); - kvm_free_vcpus(kvm); - kvm_free_physmem(kvm); - kfree(kvm); -} - -int kvm_arch_set_memory_region(struct kvm *kvm, - struct kvm_userspace_memory_region *mem, - struct kvm_memory_slot old, - int user_alloc) -{ - int npages = mem->memory_size >> PAGE_SHIFT; - struct kvm_memory_slot *memslot = &kvm->memslots[mem->slot]; - - /*To keep backward compatibility with older userspace, - *x86 needs to hanlde !user_alloc case. - */ - if (!user_alloc) { - if (npages && !old.rmap) { - down_write(¤t->mm->mmap_sem); - memslot->userspace_addr = do_mmap(NULL, 0, - npages * PAGE_SIZE, - PROT_READ | PROT_WRITE, - MAP_SHARED | MAP_ANONYMOUS, - 0); - up_write(¤t->mm->mmap_sem); - - if (IS_ERR((void *)memslot->userspace_addr)) - return PTR_ERR((void *)memslot->userspace_addr); - } else { - if (!old.user_alloc && old.rmap) { - int ret; - - down_write(¤t->mm->mmap_sem); - ret = do_munmap(current->mm, old.userspace_addr, - old.npages * PAGE_SIZE); - up_write(¤t->mm->mmap_sem); - if (ret < 0) - printk(KERN_WARNING - "kvm_vm_ioctl_set_memory_region: " - "failed to munmap memory\n"); - } - } - } - - if (!kvm->arch.n_requested_mmu_pages) { - unsigned int nr_mmu_pages = kvm_mmu_calculate_mmu_pages(kvm); - kvm_mmu_change_mmu_pages(kvm, nr_mmu_pages); - } - - kvm_mmu_slot_remove_write_access(kvm, mem->slot); - kvm_flush_remote_tlbs(kvm); - - return 0; -} - -int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu) -{ - return vcpu->arch.mp_state == VCPU_MP_STATE_RUNNABLE - || vcpu->arch.mp_state == VCPU_MP_STATE_SIPI_RECEIVED; -} |
