diff options
Diffstat (limited to 'arch/x86/kvm/x86.c')
-rw-r--r-- | arch/x86/kvm/x86.c | 403 |
1 files changed, 237 insertions, 166 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index dce75b76..1eefebe 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -246,20 +246,14 @@ static void drop_user_return_notifiers(void *ignore) 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; + 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; + kvm_lapic_set_base(vcpu, data); } EXPORT_SYMBOL_GPL(kvm_set_apic_base); @@ -698,6 +692,18 @@ unsigned long kvm_get_cr8(struct kvm_vcpu *vcpu) } EXPORT_SYMBOL_GPL(kvm_get_cr8); +static void kvm_update_dr7(struct kvm_vcpu *vcpu) +{ + unsigned long dr7; + + if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) + dr7 = vcpu->arch.guest_debug_dr7; + else + dr7 = vcpu->arch.dr7; + kvm_x86_ops->set_dr7(vcpu, dr7); + vcpu->arch.switch_db_regs = (dr7 & DR7_BP_EN_MASK); +} + static int __kvm_set_dr(struct kvm_vcpu *vcpu, int dr, unsigned long val) { switch (dr) { @@ -723,10 +729,7 @@ static int __kvm_set_dr(struct kvm_vcpu *vcpu, int dr, unsigned long val) if (val & 0xffffffff00000000ULL) return -1; /* #GP */ vcpu->arch.dr7 = (val & DR7_VOLATILE) | DR7_FIXED_1; - if (!(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)) { - kvm_x86_ops->set_dr7(vcpu, vcpu->arch.dr7); - vcpu->arch.switch_db_regs = (val & DR7_BP_EN_MASK); - } + kvm_update_dr7(vcpu); break; } @@ -823,7 +826,7 @@ static u32 msrs_to_save[] = { static unsigned num_msrs_to_save; -static u32 emulated_msrs[] = { +static const u32 emulated_msrs[] = { MSR_IA32_TSCDEADLINE, MSR_IA32_MISC_ENABLE, MSR_IA32_MCG_STATUS, @@ -1097,7 +1100,7 @@ void kvm_write_tsc(struct kvm_vcpu *vcpu, u64 data) * For each generation, we track the original measured * nanosecond time, offset, and write, so if TSCs are in * sync, we can match exact offset, and if not, we can match - * exact software computaion in compute_guest_tsc() + * exact software computation in compute_guest_tsc() * * These values are tracked in kvm->arch.cur_xxx variables. */ @@ -1140,6 +1143,7 @@ static int kvm_guest_time_update(struct kvm_vcpu *v) unsigned long this_tsc_khz; s64 kernel_ns, max_kernel_ns; u64 tsc_timestamp; + u8 pvclock_flags; /* Keep irq disabled to prevent changes to the clock */ local_irq_save(flags); @@ -1221,7 +1225,14 @@ static int kvm_guest_time_update(struct kvm_vcpu *v) vcpu->hv_clock.system_time = kernel_ns + v->kvm->arch.kvmclock_offset; vcpu->last_kernel_ns = kernel_ns; vcpu->last_guest_tsc = tsc_timestamp; - vcpu->hv_clock.flags = 0; + + pvclock_flags = 0; + if (vcpu->pvclock_set_guest_stopped_request) { + pvclock_flags |= PVCLOCK_GUEST_STOPPED; + vcpu->pvclock_set_guest_stopped_request = false; + } + + vcpu->hv_clock.flags = pvclock_flags; /* * The interface expects us to write an even number signaling that the @@ -1504,7 +1515,7 @@ static int kvm_pv_enable_async_pf(struct kvm_vcpu *vcpu, u64 data) { gpa_t gpa = data & ~0x3f; - /* Bits 2:5 are resrved, Should be zero */ + /* Bits 2:5 are reserved, Should be zero */ if (data & 0x3c) return 1; @@ -1639,10 +1650,9 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data) vcpu->arch.time_page = gfn_to_page(vcpu->kvm, data >> PAGE_SHIFT); - if (is_error_page(vcpu->arch.time_page)) { - kvm_release_page_clean(vcpu->arch.time_page); + if (is_error_page(vcpu->arch.time_page)) vcpu->arch.time_page = NULL; - } + break; } case MSR_KVM_ASYNC_PF_EN: @@ -1727,7 +1737,7 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data) * Ignore all writes to this no longer documented MSR. * Writes are only relevant for old K7 processors, * all pre-dating SVM, but a recommended workaround from - * AMD for these chips. It is possible to speicify the + * AMD for these chips. It is possible to specify the * affected processor models on the command line, hence * the need to ignore the workaround. */ @@ -2000,6 +2010,9 @@ int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata) case MSR_KVM_STEAL_TIME: data = vcpu->arch.st.msr_val; break; + case MSR_KVM_PV_EOI_EN: + data = vcpu->arch.pv_eoi.msr_val; + break; case MSR_IA32_P5_MC_ADDR: case MSR_IA32_P5_MC_TYPE: case MSR_IA32_MCG_CAP: @@ -2174,6 +2187,8 @@ int kvm_dev_ioctl_check_extension(long ext) case KVM_CAP_GET_TSC_KHZ: case KVM_CAP_PCI_2_3: case KVM_CAP_KVMCLOCK_CTRL: + case KVM_CAP_READONLY_MEM: + case KVM_CAP_IRQFD_RESAMPLE: r = 1; break; case KVM_CAP_COALESCED_MMIO: @@ -2355,8 +2370,7 @@ static int kvm_vcpu_ioctl_get_lapic(struct kvm_vcpu *vcpu, static int kvm_vcpu_ioctl_set_lapic(struct kvm_vcpu *vcpu, struct kvm_lapic_state *s) { - memcpy(vcpu->arch.apic->regs, s->regs, sizeof *s); - kvm_apic_post_state_restore(vcpu); + kvm_apic_post_state_restore(vcpu, s); update_cr8_intercept(vcpu); return 0; @@ -2365,7 +2379,7 @@ static int kvm_vcpu_ioctl_set_lapic(struct kvm_vcpu *vcpu, static int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq) { - if (irq->irq < 0 || irq->irq >= 256) + if (irq->irq < 0 || irq->irq >= KVM_NR_INTERRUPTS) return -EINVAL; if (irqchip_in_kernel(vcpu->kvm)) return -ENXIO; @@ -2632,11 +2646,9 @@ static int kvm_vcpu_ioctl_x86_set_xcrs(struct kvm_vcpu *vcpu, */ static int kvm_set_guest_paused(struct kvm_vcpu *vcpu) { - struct pvclock_vcpu_time_info *src = &vcpu->arch.hv_clock; if (!vcpu->arch.time_page) return -EINVAL; - src->flags |= PVCLOCK_GUEST_STOPPED; - mark_page_dirty(vcpu->kvm, vcpu->arch.time >> PAGE_SHIFT); + vcpu->arch.pvclock_set_guest_stopped_request = true; kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu); return 0; } @@ -3087,7 +3099,7 @@ static int kvm_vm_ioctl_reinject(struct kvm *kvm, if (!kvm->arch.vpit) return -ENXIO; mutex_lock(&kvm->arch.vpit->pit_state.lock); - kvm->arch.vpit->pit_state.pit_timer.reinject = control->pit_reinject; + kvm->arch.vpit->pit_state.reinject = control->pit_reinject; mutex_unlock(&kvm->arch.vpit->pit_state.lock); return 0; } @@ -3170,6 +3182,16 @@ out: return r; } +int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_event) +{ + if (!irqchip_in_kernel(kvm)) + return -ENXIO; + + irq_event->status = kvm_set_irq(kvm, KVM_USERSPACE_IRQ_SOURCE_ID, + irq_event->irq, irq_event->level); + return 0; +} + long kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg) { @@ -3276,29 +3298,6 @@ long kvm_arch_vm_ioctl(struct file *filp, create_pit_unlock: mutex_unlock(&kvm->slots_lock); break; - case KVM_IRQ_LINE_STATUS: - case KVM_IRQ_LINE: { - struct kvm_irq_level irq_event; - - r = -EFAULT; - if (copy_from_user(&irq_event, argp, sizeof irq_event)) - goto out; - r = -ENXIO; - if (irqchip_in_kernel(kvm)) { - __s32 status; - status = kvm_set_irq(kvm, KVM_USERSPACE_IRQ_SOURCE_ID, - irq_event.irq, irq_event.level); - if (ioctl == KVM_IRQ_LINE_STATUS) { - r = -EFAULT; - irq_event.status = status; - if (copy_to_user(argp, &irq_event, - sizeof irq_event)) - goto out; - } - r = 0; - } - break; - } case KVM_GET_IRQCHIP: { /* 0: PIC master, 1: PIC slave, 2: IOAPIC */ struct kvm_irqchip *chip; @@ -3686,20 +3685,17 @@ static int vcpu_mmio_gva_to_gpa(struct kvm_vcpu *vcpu, unsigned long gva, gpa_t *gpa, struct x86_exception *exception, bool write) { - u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0; + u32 access = ((kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0) + | (write ? PFERR_WRITE_MASK : 0); - if (vcpu_match_mmio_gva(vcpu, gva) && - check_write_user_access(vcpu, write, access, - vcpu->arch.access)) { + if (vcpu_match_mmio_gva(vcpu, gva) + && !permission_fault(vcpu->arch.walk_mmu, vcpu->arch.access, access)) { *gpa = vcpu->arch.mmio_gfn << PAGE_SHIFT | (gva & (PAGE_SIZE - 1)); trace_vcpu_match_mmio(gva, *gpa, write, false); return 1; } - if (write) - access |= PFERR_WRITE_MASK; - *gpa = vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, access, exception); if (*gpa == UNMAPPED_GVA) @@ -3787,14 +3783,14 @@ static int write_exit_mmio(struct kvm_vcpu *vcpu, gpa_t gpa, return X86EMUL_CONTINUE; } -static struct read_write_emulator_ops read_emultor = { +static const struct read_write_emulator_ops read_emultor = { .read_write_prepare = read_prepare, .read_write_emulate = read_emulate, .read_write_mmio = vcpu_mmio_read, .read_write_exit_mmio = read_exit_mmio, }; -static struct read_write_emulator_ops write_emultor = { +static const struct read_write_emulator_ops write_emultor = { .read_write_emulate = write_emulate, .read_write_mmio = write_mmio, .read_write_exit_mmio = write_exit_mmio, @@ -3805,7 +3801,7 @@ static int emulator_read_write_onepage(unsigned long addr, void *val, unsigned int bytes, struct x86_exception *exception, struct kvm_vcpu *vcpu, - struct read_write_emulator_ops *ops) + const struct read_write_emulator_ops *ops) { gpa_t gpa; int handled, ret; @@ -3854,7 +3850,7 @@ mmio: int emulator_read_write(struct x86_emulate_ctxt *ctxt, unsigned long addr, void *val, unsigned int bytes, struct x86_exception *exception, - struct read_write_emulator_ops *ops) + const struct read_write_emulator_ops *ops) { struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); gpa_t gpa; @@ -3959,10 +3955,8 @@ static int emulator_cmpxchg_emulated(struct x86_emulate_ctxt *ctxt, goto emul_write; page = gfn_to_page(vcpu->kvm, gpa >> PAGE_SHIFT); - if (is_error_page(page)) { - kvm_release_page_clean(page); + if (is_error_page(page)) goto emul_write; - } kaddr = kmap_atomic(page); kaddr += offset_in_page(gpa); @@ -4329,7 +4323,19 @@ static void emulator_get_cpuid(struct x86_emulate_ctxt *ctxt, kvm_cpuid(emul_to_vcpu(ctxt), eax, ebx, ecx, edx); } -static struct x86_emulate_ops emulate_ops = { +static ulong emulator_read_gpr(struct x86_emulate_ctxt *ctxt, unsigned reg) +{ + return kvm_register_read(emul_to_vcpu(ctxt), reg); +} + +static void emulator_write_gpr(struct x86_emulate_ctxt *ctxt, unsigned reg, ulong val) +{ + kvm_register_write(emul_to_vcpu(ctxt), reg, val); +} + +static const struct x86_emulate_ops emulate_ops = { + .read_gpr = emulator_read_gpr, + .write_gpr = emulator_write_gpr, .read_std = kvm_read_guest_virt_system, .write_std = kvm_write_guest_virt_system, .fetch = kvm_fetch_guest_virt, @@ -4364,14 +4370,6 @@ static struct x86_emulate_ops emulate_ops = { .get_cpuid = emulator_get_cpuid, }; -static void cache_all_regs(struct kvm_vcpu *vcpu) -{ - kvm_register_read(vcpu, VCPU_REGS_RAX); - kvm_register_read(vcpu, VCPU_REGS_RSP); - kvm_register_read(vcpu, VCPU_REGS_RIP); - vcpu->arch.regs_dirty = ~0; -} - static void toggle_interruptibility(struct kvm_vcpu *vcpu, u32 mask) { u32 int_shadow = kvm_x86_ops->get_interrupt_shadow(vcpu, mask); @@ -4398,12 +4396,10 @@ static void inject_emulated_exception(struct kvm_vcpu *vcpu) kvm_queue_exception(vcpu, ctxt->exception.vector); } -static void init_decode_cache(struct x86_emulate_ctxt *ctxt, - const unsigned long *regs) +static void init_decode_cache(struct x86_emulate_ctxt *ctxt) { memset(&ctxt->twobyte, 0, - (void *)&ctxt->regs - (void *)&ctxt->twobyte); - memcpy(ctxt->regs, regs, sizeof(ctxt->regs)); + (void *)&ctxt->_regs - (void *)&ctxt->twobyte); ctxt->fetch.start = 0; ctxt->fetch.end = 0; @@ -4418,14 +4414,6 @@ static void init_emulate_ctxt(struct kvm_vcpu *vcpu) struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt; int cs_db, cs_l; - /* - * TODO: fix emulate.c to use guest_read/write_register - * instead of direct ->regs accesses, can save hundred cycles - * on Intel for instructions that don't read/change RSP, for - * for example. - */ - cache_all_regs(vcpu); - kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l); ctxt->eflags = kvm_get_rflags(vcpu); @@ -4437,7 +4425,7 @@ static void init_emulate_ctxt(struct kvm_vcpu *vcpu) X86EMUL_MODE_PROT16; ctxt->guest_mode = is_guest_mode(vcpu); - init_decode_cache(ctxt, vcpu->arch.regs); + init_decode_cache(ctxt); vcpu->arch.emulate_regs_need_sync_from_vcpu = false; } @@ -4457,7 +4445,6 @@ int kvm_inject_realmode_interrupt(struct kvm_vcpu *vcpu, int irq, int inc_eip) return EMULATE_FAIL; ctxt->eip = ctxt->_eip; - memcpy(vcpu->arch.regs, ctxt->regs, sizeof ctxt->regs); kvm_rip_write(vcpu, ctxt->eip); kvm_set_rflags(vcpu, ctxt->eflags); @@ -4490,13 +4477,14 @@ static int handle_emulation_failure(struct kvm_vcpu *vcpu) static bool reexecute_instruction(struct kvm_vcpu *vcpu, gva_t gva) { gpa_t gpa; + pfn_t pfn; if (tdp_enabled) return false; /* * if emulation was due to access to shadowed page table - * and it failed try to unshadow page and re-entetr the + * and it failed try to unshadow page and re-enter the * guest to let CPU execute the instruction. */ if (kvm_mmu_unprotect_page_virt(vcpu, gva)) @@ -4507,8 +4495,17 @@ static bool reexecute_instruction(struct kvm_vcpu *vcpu, gva_t gva) if (gpa == UNMAPPED_GVA) return true; /* let cpu generate fault */ - if (!kvm_is_error_hva(gfn_to_hva(vcpu->kvm, gpa >> PAGE_SHIFT))) + /* + * Do not retry the unhandleable instruction if it faults on the + * readonly host memory, otherwise it will goto a infinite loop: + * retry instruction -> write #PF -> emulation fail -> retry + * instruction -> ... + */ + pfn = gfn_to_pfn(vcpu->kvm, gpa_to_gfn(gpa)); + if (!is_error_pfn(pfn)) { + kvm_release_pfn_clean(pfn); return true; + } return false; } @@ -4557,6 +4554,9 @@ static bool retry_instruction(struct x86_emulate_ctxt *ctxt, return true; } +static int complete_emulated_mmio(struct kvm_vcpu *vcpu); +static int complete_emulated_pio(struct kvm_vcpu *vcpu); + int x86_emulate_instruction(struct kvm_vcpu *vcpu, unsigned long cr2, int emulation_type, @@ -4605,7 +4605,7 @@ int x86_emulate_instruction(struct kvm_vcpu *vcpu, changes registers values during IO operation */ if (vcpu->arch.emulate_regs_need_sync_from_vcpu) { vcpu->arch.emulate_regs_need_sync_from_vcpu = false; - memcpy(ctxt->regs, vcpu->arch.regs, sizeof ctxt->regs); + emulator_invalidate_register_cache(ctxt); } restart: @@ -4627,13 +4627,16 @@ restart: } else if (vcpu->arch.pio.count) { if (!vcpu->arch.pio.in) vcpu->arch.pio.count = 0; - else + else { writeback = false; + vcpu->arch.complete_userspace_io = complete_emulated_pio; + } r = EMULATE_DO_MMIO; } else if (vcpu->mmio_needed) { if (!vcpu->mmio_is_write) writeback = false; r = EMULATE_DO_MMIO; + vcpu->arch.complete_userspace_io = complete_emulated_mmio; } else if (r == EMULATION_RESTART) goto restart; else @@ -4643,7 +4646,6 @@ restart: toggle_interruptibility(vcpu, ctxt->interruptibility); kvm_set_rflags(vcpu, ctxt->eflags); kvm_make_request(KVM_REQ_EVENT, vcpu); - memcpy(vcpu->arch.regs, ctxt->regs, sizeof ctxt->regs); vcpu->arch.emulate_regs_need_sync_to_vcpu = false; kvm_rip_write(vcpu, ctxt->eip); } else @@ -4926,6 +4928,7 @@ int kvm_arch_init(void *opaque) if (cpu_has_xsave) host_xcr0 = xgetbv(XCR_XFEATURE_ENABLED_MASK); + kvm_lapic_init(); return 0; out: @@ -5110,17 +5113,20 @@ static void post_kvm_run_save(struct kvm_vcpu *vcpu) !kvm_event_needs_reinjection(vcpu); } -static void vapic_enter(struct kvm_vcpu *vcpu) +static int vapic_enter(struct kvm_vcpu *vcpu) { struct kvm_lapic *apic = vcpu->arch.apic; struct page *page; if (!apic || !apic->vapic_addr) - return; + return 0; page = gfn_to_page(vcpu->kvm, apic->vapic_addr >> PAGE_SHIFT); + if (is_error_page(page)) + return -EFAULT; vcpu->arch.apic->vapic_page = page; + return 0; } static void vapic_exit(struct kvm_vcpu *vcpu) @@ -5427,7 +5433,11 @@ static int __vcpu_run(struct kvm_vcpu *vcpu) } vcpu->srcu_idx = srcu_read_lock(&kvm->srcu); - vapic_enter(vcpu); + r = vapic_enter(vcpu); + if (r) { + srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx); + return r; + } r = 1; while (r > 0) { @@ -5489,6 +5499,24 @@ static int __vcpu_run(struct kvm_vcpu *vcpu) return r; } +static inline int complete_emulated_io(struct kvm_vcpu *vcpu) +{ + int r; + vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); + r = emulate_instruction(vcpu, EMULTYPE_NO_DECODE); + srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx); + if (r != EMULATE_DONE) + return 0; + return 1; +} + +static int complete_emulated_pio(struct kvm_vcpu *vcpu) +{ + BUG_ON(!vcpu->arch.pio.count); + + return complete_emulated_io(vcpu); +} + /* * Implements the following, as a state machine: * @@ -5505,47 +5533,37 @@ static int __vcpu_run(struct kvm_vcpu *vcpu) * copy data * exit */ -static int complete_mmio(struct kvm_vcpu *vcpu) +static int complete_emulated_mmio(struct kvm_vcpu *vcpu) { struct kvm_run *run = vcpu->run; struct kvm_mmio_fragment *frag; - int r; - if (!(vcpu->arch.pio.count || vcpu->mmio_needed)) - return 1; + BUG_ON(!vcpu->mmio_needed); - if (vcpu->mmio_needed) { - /* Complete previous fragment */ - frag = &vcpu->mmio_fragments[vcpu->mmio_cur_fragment++]; - if (!vcpu->mmio_is_write) - memcpy(frag->data, run->mmio.data, frag->len); - if (vcpu->mmio_cur_fragment == vcpu->mmio_nr_fragments) { - vcpu->mmio_needed = 0; - if (vcpu->mmio_is_write) - return 1; - vcpu->mmio_read_completed = 1; - goto done; - } - /* Initiate next fragment */ - ++frag; - run->exit_reason = KVM_EXIT_MMIO; - run->mmio.phys_addr = frag->gpa; + /* Complete previous fragment */ + frag = &vcpu->mmio_fragments[vcpu->mmio_cur_fragment++]; + if (!vcpu->mmio_is_write) + memcpy(frag->data, run->mmio.data, frag->len); + if (vcpu->mmio_cur_fragment == vcpu->mmio_nr_fragments) { + vcpu->mmio_needed = 0; if (vcpu->mmio_is_write) - memcpy(run->mmio.data, frag->data, frag->len); - run->mmio.len = frag->len; - run->mmio.is_write = vcpu->mmio_is_write; - return 0; - - } -done: - vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); - r = emulate_instruction(vcpu, EMULTYPE_NO_DECODE); - srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx); - if (r != EMULATE_DONE) - return 0; - return 1; + return 1; + vcpu->mmio_read_completed = 1; + return complete_emulated_io(vcpu); + } + /* Initiate next fragment */ + ++frag; + run->exit_reason = KVM_EXIT_MMIO; + run->mmio.phys_addr = frag->gpa; + if (vcpu->mmio_is_write) + memcpy(run->mmio.data, frag->data, frag->len); + run->mmio.len = frag->len; + run->mmio.is_write = vcpu->mmio_is_write; + vcpu->arch.complete_userspace_io = complete_emulated_mmio; + return 0; } + int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) { int r; @@ -5572,9 +5590,14 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) } } - r = complete_mmio(vcpu); - if (r <= 0) - goto out; + if (unlikely(vcpu->arch.complete_userspace_io)) { + int (*cui)(struct kvm_vcpu *) = vcpu->arch.complete_userspace_io; + vcpu->arch.complete_userspace_io = NULL; + r = cui(vcpu); + if (r <= 0) + goto out; + } else + WARN_ON(vcpu->arch.pio.count || vcpu->mmio_needed); r = __vcpu_run(vcpu); @@ -5592,12 +5615,11 @@ int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) /* * We are here if userspace calls get_regs() in the middle of * instruction emulation. Registers state needs to be copied - * back from emulation context to vcpu. Usrapace shouldn't do + * back from emulation context to vcpu. Userspace shouldn't do * that usually, but some bad designed PV devices (vmware * backdoor interface) need this to work */ - struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt; - memcpy(vcpu->arch.regs, ctxt->regs, sizeof ctxt->regs); + emulator_writeback_register_cache(&vcpu->arch.emulate_ctxt); vcpu->arch.emulate_regs_need_sync_to_vcpu = false; } regs->rax = kvm_register_read(vcpu, VCPU_REGS_RAX); @@ -5737,7 +5759,6 @@ int kvm_task_switch(struct kvm_vcpu *vcpu, u16 tss_selector, int idt_index, if (ret) return EMULATE_FAIL; - memcpy(vcpu->arch.regs, ctxt->regs, sizeof ctxt->regs); kvm_rip_write(vcpu, ctxt->eip); kvm_set_rflags(vcpu, ctxt->eflags); kvm_make_request(KVM_REQ_EVENT, vcpu); @@ -5789,7 +5810,7 @@ int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu, if (mmu_reset_needed) kvm_mmu_reset_context(vcpu); - max_bits = (sizeof sregs->interrupt_bitmap) << 3; + max_bits = KVM_NR_INTERRUPTS; pending_vec = find_first_bit( (const unsigned long *)sregs->interrupt_bitmap, max_bits); if (pending_vec < max_bits) { @@ -5849,13 +5870,12 @@ int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu, if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) { for (i = 0; i < KVM_NR_DB_REGS; ++i) vcpu->arch.eff_db[i] = dbg->arch.debugreg[i]; - vcpu->arch.switch_db_regs = - (dbg->arch.debugreg[7] & DR7_BP_EN_MASK); + vcpu->arch.guest_debug_dr7 = dbg->arch.debugreg[7]; } else { for (i = 0; i < KVM_NR_DB_REGS; i++) vcpu->arch.eff_db[i] = vcpu->arch.db[i]; - vcpu->arch.switch_db_regs = (vcpu->arch.dr7 & DR7_BP_EN_MASK); } + kvm_update_dr7(vcpu); if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP) vcpu->arch.singlestep_rip = kvm_rip_read(vcpu) + @@ -5867,7 +5887,7 @@ int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu, */ kvm_set_rflags(vcpu, rflags); - kvm_x86_ops->set_guest_debug(vcpu, dbg); + kvm_x86_ops->update_db_bp_intercept(vcpu); r = 0; @@ -5969,7 +5989,7 @@ void kvm_load_guest_fpu(struct kvm_vcpu *vcpu) */ kvm_put_guest_xcr0(vcpu); vcpu->guest_fpu_loaded = 1; - unlazy_fpu(current); + __kernel_fpu_begin(); fpu_restore_checking(&vcpu->arch.guest_fpu); trace_kvm_fpu(1); } @@ -5983,6 +6003,7 @@ void kvm_put_guest_fpu(struct kvm_vcpu *vcpu) vcpu->guest_fpu_loaded = 0; fpu_save_init(&vcpu->arch.guest_fpu); + __kernel_fpu_end(); ++vcpu->stat.fpu_reload; kvm_make_request(KVM_REQ_DEACTIVATE_FPU, vcpu); trace_kvm_fpu(0); @@ -6012,7 +6033,9 @@ int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu) int r; vcpu->arch.mtrr_state.have_fixed = 1; - vcpu_load(vcpu); + r = vcpu_load(vcpu); + if (r) + return r; r = kvm_arch_vcpu_reset(vcpu); if (r == 0) r = kvm_mmu_setup(vcpu); @@ -6023,9 +6046,11 @@ int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu) void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu) { + int r; vcpu->arch.apf.msr_val = 0; - vcpu_load(vcpu); + r = vcpu_load(vcpu); + BUG_ON(r); kvm_mmu_unload(vcpu); vcpu_put(vcpu); @@ -6039,10 +6064,10 @@ int kvm_arch_vcpu_reset(struct kvm_vcpu *vcpu) vcpu->arch.nmi_pending = 0; vcpu->arch.nmi_injected = false; - vcpu->arch.switch_db_regs = 0; memset(vcpu->arch.db, 0, sizeof(vcpu->arch.db)); vcpu->arch.dr6 = DR6_FIXED_1; vcpu->arch.dr7 = DR7_FIXED_1; + kvm_update_dr7(vcpu); kvm_make_request(KVM_REQ_EVENT, vcpu); vcpu->arch.apf.msr_val = 0; @@ -6121,7 +6146,7 @@ int kvm_arch_hardware_enable(void *garbage) * as we reset last_host_tsc on all VCPUs to stop this from being * called multiple times (one for each physical CPU bringup). * - * Platforms with unnreliable TSCs don't have to deal with this, they + * Platforms with unreliable TSCs don't have to deal with this, they * will be compensated by the logic in vcpu_load, which sets the TSC to * catchup mode. This will catchup all VCPUs to real time, but cannot * guarantee that they stay in perfect synchronization. @@ -6174,6 +6199,8 @@ bool kvm_vcpu_compatible(struct kvm_vcpu *vcpu) return irqchip_in_kernel(vcpu->kvm) == (vcpu->arch.apic != NULL); } +struct static_key kvm_no_apic_vcpu __read_mostly; + int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu) { struct page *page; @@ -6206,7 +6233,8 @@ int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu) r = kvm_create_lapic(vcpu); if (r < 0) goto fail_mmu_destroy; - } + } else + static_key_slow_inc(&kvm_no_apic_vcpu); vcpu->arch.mce_banks = kzalloc(KVM_MAX_MCE_BANKS * sizeof(u64) * 4, GFP_KERNEL); @@ -6246,6 +6274,8 @@ void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) kvm_mmu_destroy(vcpu); srcu_read_unlock(&vcpu->kvm->srcu, idx); free_page((unsigned long)vcpu->arch.pio_data); + if (!irqchip_in_kernel(vcpu->kvm)) + static_key_slow_dec(&kvm_no_apic_vcpu); } int kvm_arch_init_vm(struct kvm *kvm, unsigned long type) @@ -6258,15 +6288,21 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type) /* Reserve bit 0 of irq_sources_bitmap for userspace irq source */ set_bit(KVM_USERSPACE_IRQ_SOURCE_ID, &kvm->arch.irq_sources_bitmap); + /* Reserve bit 1 of irq_sources_bitmap for irqfd-resampler */ + set_bit(KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID, + &kvm->arch.irq_sources_bitmap); raw_spin_lock_init(&kvm->arch.tsc_write_lock); + mutex_init(&kvm->arch.apic_map_lock); return 0; } static void kvm_unload_vcpu_mmu(struct kvm_vcpu *vcpu) { - vcpu_load(vcpu); + int r; + r = vcpu_load(vcpu); + BUG_ON(r); kvm_mmu_unload(vcpu); vcpu_put(vcpu); } @@ -6310,6 +6346,7 @@ void kvm_arch_destroy_vm(struct kvm *kvm) put_page(kvm->arch.apic_access_page); if (kvm->arch.ept_identity_pagetable) put_page(kvm->arch.ept_identity_pagetable); + kfree(rcu_dereference_check(kvm->arch.apic_map, 1)); } void kvm_arch_free_memslot(struct kvm_memory_slot *free, @@ -6317,10 +6354,18 @@ void kvm_arch_free_memslot(struct kvm_memory_slot *free, { int i; - for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) { - if (!dont || free->arch.lpage_info[i] != dont->arch.lpage_info[i]) { - kvm_kvfree(free->arch.lpage_info[i]); - free->arch.lpage_info[i] = NULL; + for (i = 0; i < KVM_NR_PAGE_SIZES; ++i) { + if (!dont || free->arch.rmap[i] != dont->arch.rmap[i]) { + kvm_kvfree(free->arch.rmap[i]); + free->arch.rmap[i] = NULL; + } + if (i == 0) + continue; + + if (!dont || free->arch.lpage_info[i - 1] != + dont->arch.lpage_info[i - 1]) { + kvm_kvfree(free->arch.lpage_info[i - 1]); + free->arch.lpage_info[i - 1] = NULL; } } } @@ -6329,23 +6374,30 @@ int kvm_arch_create_memslot(struct kvm_memory_slot *slot, unsigned long npages) { int i; - for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) { + for (i = 0; i < KVM_NR_PAGE_SIZES; ++i) { unsigned long ugfn; int lpages; - int level = i + 2; + int level = i + 1; lpages = gfn_to_index(slot->base_gfn + npages - 1, slot->base_gfn, level) + 1; - slot->arch.lpage_info[i] = - kvm_kvzalloc(lpages * sizeof(*slot->arch.lpage_info[i])); - if (!slot->arch.lpage_info[i]) + slot->arch.rmap[i] = + kvm_kvzalloc(lpages * sizeof(*slot->arch.rmap[i])); + if (!slot->arch.rmap[i]) + goto out_free; + if (i == 0) + continue; + + slot->arch.lpage_info[i - 1] = kvm_kvzalloc(lpages * + sizeof(*slot->arch.lpage_info[i - 1])); + if (!slot->arch.lpage_info[i - 1]) goto out_free; if (slot->base_gfn & (KVM_PAGES_PER_HPAGE(level) - 1)) - slot->arch.lpage_info[i][0].write_count = 1; + slot->arch.lpage_info[i - 1][0].write_count = 1; if ((slot->base_gfn + npages) & (KVM_PAGES_PER_HPAGE(level) - 1)) - slot->arch.lpage_info[i][lpages - 1].write_count = 1; + slot->arch.lpage_info[i - 1][lpages - 1].write_count = 1; ugfn = slot->userspace_addr >> PAGE_SHIFT; /* * If the gfn and userspace address are not aligned wrt each @@ -6357,16 +6409,21 @@ int kvm_arch_create_memslot(struct kvm_memory_slot *slot, unsigned long npages) unsigned long j; for (j = 0; j < lpages; ++j) - slot->arch.lpage_info[i][j].write_count = 1; + slot->arch.lpage_info[i - 1][j].write_count = 1; } } return 0; out_free: - for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) { - kvm_kvfree(slot->arch.lpage_info[i]); - slot->arch.lpage_info[i] = NULL; + for (i = 0; i < KVM_NR_PAGE_SIZES; ++i) { + kvm_kvfree(slot->arch.rmap[i]); + slot->arch.rmap[i] = NULL; + if (i == 0) + continue; + + kvm_kvfree(slot->arch.lpage_info[i - 1]); + slot->arch.lpage_info[i - 1] = NULL; } return -ENOMEM; } @@ -6385,10 +6442,10 @@ int kvm_arch_prepare_memory_region(struct kvm *kvm, map_flags = MAP_SHARED | MAP_ANONYMOUS; /*To keep backward compatibility with older userspace, - *x86 needs to hanlde !user_alloc case. + *x86 needs to handle !user_alloc case. */ if (!user_alloc) { - if (npages && !old.rmap) { + if (npages && !old.npages) { unsigned long userspace_addr; userspace_addr = vm_mmap(NULL, 0, @@ -6416,7 +6473,7 @@ void kvm_arch_commit_memory_region(struct kvm *kvm, int nr_mmu_pages = 0, npages = mem->memory_size >> PAGE_SHIFT; - if (!user_alloc && !old.user_alloc && old.rmap && !npages) { + if (!user_alloc && !old.user_alloc && old.npages && !npages) { int ret; ret = vm_munmap(old.userspace_addr, @@ -6435,14 +6492,28 @@ void kvm_arch_commit_memory_region(struct kvm *kvm, kvm_mmu_change_mmu_pages(kvm, nr_mmu_pages); kvm_mmu_slot_remove_write_access(kvm, mem->slot); spin_unlock(&kvm->mmu_lock); + /* + * If memory slot is created, or moved, we need to clear all + * mmio sptes. + */ + if (npages && old.base_gfn != mem->guest_phys_addr >> PAGE_SHIFT) { + kvm_mmu_zap_all(kvm); + kvm_reload_remote_mmus(kvm); + } } -void kvm_arch_flush_shadow(struct kvm *kvm) +void kvm_arch_flush_shadow_all(struct kvm *kvm) { kvm_mmu_zap_all(kvm); kvm_reload_remote_mmus(kvm); } +void kvm_arch_flush_shadow_memslot(struct kvm *kvm, + struct kvm_memory_slot *slot) +{ + kvm_arch_flush_shadow_all(kvm); +} + int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu) { return (vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE && |