diff options
Diffstat (limited to 'drivers/kvm/vmx.c')
| -rw-r--r-- | drivers/kvm/vmx.c | 65 |
1 files changed, 61 insertions, 4 deletions
diff --git a/drivers/kvm/vmx.c b/drivers/kvm/vmx.c index 6c371ea21046..5c2c6e71abf2 100644 --- a/drivers/kvm/vmx.c +++ b/drivers/kvm/vmx.c @@ -170,6 +170,16 @@ static inline int is_external_interrupt(u32 intr_info) == (INTR_TYPE_EXT_INTR | INTR_INFO_VALID_MASK); } +static inline int cpu_has_vmx_tpr_shadow(void) +{ + return (vmcs_config.cpu_based_exec_ctrl & CPU_BASED_TPR_SHADOW); +} + +static inline int vm_need_tpr_shadow(struct kvm *kvm) +{ + return ((cpu_has_vmx_tpr_shadow()) && (irqchip_in_kernel(kvm))); +} + static int __find_msr_index(struct vcpu_vmx *vmx, u32 msr) { int i; @@ -888,10 +898,19 @@ static __init int setup_vmcs_config(struct vmcs_config *vmcs_conf) CPU_BASED_USE_IO_BITMAPS | CPU_BASED_MOV_DR_EXITING | CPU_BASED_USE_TSC_OFFSETING; +#ifdef CONFIG_X86_64 + opt = CPU_BASED_TPR_SHADOW; +#else opt = 0; +#endif if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_PROCBASED_CTLS, &_cpu_based_exec_control) < 0) return -EIO; +#ifdef CONFIG_X86_64 + if ((_cpu_based_exec_control & CPU_BASED_TPR_SHADOW)) + _cpu_based_exec_control &= ~CPU_BASED_CR8_LOAD_EXITING & + ~CPU_BASED_CR8_STORE_EXITING; +#endif min = 0; #ifdef CONFIG_X86_64 @@ -1384,6 +1403,7 @@ static int vmx_vcpu_setup(struct vcpu_vmx *vmx) int ret = 0; unsigned long kvm_vmx_return; u64 msr; + u32 exec_control; if (!init_rmode_tss(vmx->vcpu.kvm)) { ret = -ENOMEM; @@ -1459,8 +1479,16 @@ static int vmx_vcpu_setup(struct vcpu_vmx *vmx) /* Control */ vmcs_write32(PIN_BASED_VM_EXEC_CONTROL, vmcs_config.pin_based_exec_ctrl); - vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, - vmcs_config.cpu_based_exec_ctrl); + + exec_control = vmcs_config.cpu_based_exec_ctrl; + if (!vm_need_tpr_shadow(vmx->vcpu.kvm)) { + exec_control &= ~CPU_BASED_TPR_SHADOW; +#ifdef CONFIG_X86_64 + exec_control |= CPU_BASED_CR8_STORE_EXITING | + CPU_BASED_CR8_LOAD_EXITING; +#endif + } + vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, exec_control); vmcs_write32(PAGE_FAULT_ERROR_CODE_MASK, 0); vmcs_write32(PAGE_FAULT_ERROR_CODE_MATCH, 0); @@ -1532,8 +1560,11 @@ static int vmx_vcpu_setup(struct vcpu_vmx *vmx) vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, 0); /* 22.2.1 */ #ifdef CONFIG_X86_64 - vmcs_writel(VIRTUAL_APIC_PAGE_ADDR, 0); - vmcs_writel(TPR_THRESHOLD, 0); + vmcs_write64(VIRTUAL_APIC_PAGE_ADDR, 0); + if (vm_need_tpr_shadow(vmx->vcpu.kvm)) + vmcs_write64(VIRTUAL_APIC_PAGE_ADDR, + page_to_phys(vmx->vcpu.apic->regs_page)); + vmcs_write32(TPR_THRESHOLD, 0); #endif vmcs_writel(CR0_GUEST_HOST_MASK, ~0UL); @@ -1969,6 +2000,12 @@ static int handle_wrmsr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) return 1; } +static int handle_tpr_below_threshold(struct kvm_vcpu *vcpu, + struct kvm_run *kvm_run) +{ + return 1; +} + static void post_kvm_run_save(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) { @@ -2036,6 +2073,7 @@ static int (*kvm_vmx_exit_handlers[])(struct kvm_vcpu *vcpu, [EXIT_REASON_PENDING_INTERRUPT] = handle_interrupt_window, [EXIT_REASON_HLT] = handle_halt, [EXIT_REASON_VMCALL] = handle_vmcall, + [EXIT_REASON_TPR_BELOW_THRESHOLD] = handle_tpr_below_threshold }; static const int kvm_vmx_max_exit_handlers = @@ -2083,6 +2121,23 @@ static void vmx_flush_tlb(struct kvm_vcpu *vcpu) { } +static void update_tpr_threshold(struct kvm_vcpu *vcpu) +{ + int max_irr, tpr; + + if (!vm_need_tpr_shadow(vcpu->kvm)) + return; + + if (!kvm_lapic_enabled(vcpu) || + ((max_irr = kvm_lapic_find_highest_irr(vcpu)) == -1)) { + vmcs_write32(TPR_THRESHOLD, 0); + return; + } + + tpr = (kvm_lapic_get_cr8(vcpu) & 0x0f) << 4; + vmcs_write32(TPR_THRESHOLD, (max_irr > tpr) ? tpr >> 4 : max_irr >> 4); +} + static void enable_irq_window(struct kvm_vcpu *vcpu) { u32 cpu_based_vm_exec_control; @@ -2097,6 +2152,8 @@ static void vmx_intr_assist(struct kvm_vcpu *vcpu) u32 idtv_info_field, intr_info_field; int has_ext_irq, interrupt_window_open; + update_tpr_threshold(vcpu); + has_ext_irq = kvm_cpu_has_interrupt(vcpu); intr_info_field = vmcs_read32(VM_ENTRY_INTR_INFO_FIELD); idtv_info_field = vmcs_read32(IDT_VECTORING_INFO_FIELD); |