KVM: nVMX: Allow to disable VM_{ENTRY_LOAD,EXIT_SAVE}_DEBUG_CONTROLS
Allow L1 to "leak" its debug controls into L2, i.e. permit cleared VM_{ENTRY_LOAD,EXIT_SAVE}_DEBUG_CONTROLS. This requires to manually transfer the state of DR7 and IA32_DEBUGCTLMSR from L1 into L2 as both run on different VMCS. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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560b7ee12c
commit
2996fca069
1 changed files with 38 additions and 6 deletions
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@ -383,6 +383,9 @@ struct nested_vmx {
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struct hrtimer preemption_timer;
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bool preemption_timer_expired;
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/* to migrate it to L2 if VM_ENTRY_LOAD_DEBUG_CONTROLS is off */
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u64 vmcs01_debugctl;
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};
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#define POSTED_INTR_ON 0
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@ -2243,7 +2246,9 @@ static u32 nested_vmx_true_procbased_ctls_low;
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static u32 nested_vmx_secondary_ctls_low, nested_vmx_secondary_ctls_high;
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static u32 nested_vmx_pinbased_ctls_low, nested_vmx_pinbased_ctls_high;
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static u32 nested_vmx_exit_ctls_low, nested_vmx_exit_ctls_high;
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static u32 nested_vmx_true_exit_ctls_low;
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static u32 nested_vmx_entry_ctls_low, nested_vmx_entry_ctls_high;
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static u32 nested_vmx_true_entry_ctls_low;
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static u32 nested_vmx_misc_low, nested_vmx_misc_high;
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static u32 nested_vmx_ept_caps;
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static __init void nested_vmx_setup_ctls_msrs(void)
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@ -2289,6 +2294,10 @@ static __init void nested_vmx_setup_ctls_msrs(void)
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if (vmx_mpx_supported())
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nested_vmx_exit_ctls_high |= VM_EXIT_CLEAR_BNDCFGS;
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/* We support free control of debug control saving. */
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nested_vmx_true_exit_ctls_low = nested_vmx_exit_ctls_low &
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~VM_EXIT_SAVE_DEBUG_CONTROLS;
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/* entry controls */
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rdmsr(MSR_IA32_VMX_ENTRY_CTLS,
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nested_vmx_entry_ctls_low, nested_vmx_entry_ctls_high);
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@ -2303,6 +2312,10 @@ static __init void nested_vmx_setup_ctls_msrs(void)
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if (vmx_mpx_supported())
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nested_vmx_entry_ctls_high |= VM_ENTRY_LOAD_BNDCFGS;
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/* We support free control of debug control loading. */
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nested_vmx_true_entry_ctls_low = nested_vmx_entry_ctls_low &
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~VM_ENTRY_LOAD_DEBUG_CONTROLS;
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/* cpu-based controls */
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rdmsr(MSR_IA32_VMX_PROCBASED_CTLS,
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nested_vmx_procbased_ctls_low, nested_vmx_procbased_ctls_high);
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@ -2409,11 +2422,17 @@ static int vmx_get_vmx_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
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nested_vmx_procbased_ctls_high);
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break;
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case MSR_IA32_VMX_TRUE_EXIT_CTLS:
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*pdata = vmx_control_msr(nested_vmx_true_exit_ctls_low,
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nested_vmx_exit_ctls_high);
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break;
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case MSR_IA32_VMX_EXIT_CTLS:
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*pdata = vmx_control_msr(nested_vmx_exit_ctls_low,
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nested_vmx_exit_ctls_high);
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break;
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case MSR_IA32_VMX_TRUE_ENTRY_CTLS:
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*pdata = vmx_control_msr(nested_vmx_true_entry_ctls_low,
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nested_vmx_entry_ctls_high);
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break;
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case MSR_IA32_VMX_ENTRY_CTLS:
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*pdata = vmx_control_msr(nested_vmx_entry_ctls_low,
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nested_vmx_entry_ctls_high);
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@ -7836,7 +7855,13 @@ static void prepare_vmcs02(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12)
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vmcs_writel(GUEST_GDTR_BASE, vmcs12->guest_gdtr_base);
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vmcs_writel(GUEST_IDTR_BASE, vmcs12->guest_idtr_base);
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vmcs_write64(GUEST_IA32_DEBUGCTL, vmcs12->guest_ia32_debugctl);
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if (vmcs12->vm_entry_controls & VM_ENTRY_LOAD_DEBUG_CONTROLS) {
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kvm_set_dr(vcpu, 7, vmcs12->guest_dr7);
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vmcs_write64(GUEST_IA32_DEBUGCTL, vmcs12->guest_ia32_debugctl);
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} else {
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kvm_set_dr(vcpu, 7, vcpu->arch.dr7);
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vmcs_write64(GUEST_IA32_DEBUGCTL, vmx->nested.vmcs01_debugctl);
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}
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vmcs_write32(VM_ENTRY_INTR_INFO_FIELD,
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vmcs12->vm_entry_intr_info_field);
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vmcs_write32(VM_ENTRY_EXCEPTION_ERROR_CODE,
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@ -7846,7 +7871,6 @@ static void prepare_vmcs02(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12)
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vmcs_write32(GUEST_INTERRUPTIBILITY_INFO,
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vmcs12->guest_interruptibility_info);
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vmcs_write32(GUEST_SYSENTER_CS, vmcs12->guest_sysenter_cs);
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kvm_set_dr(vcpu, 7, vmcs12->guest_dr7);
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vmx_set_rflags(vcpu, vmcs12->guest_rflags);
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vmcs_writel(GUEST_PENDING_DBG_EXCEPTIONS,
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vmcs12->guest_pending_dbg_exceptions);
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@ -8143,9 +8167,11 @@ static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch)
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!vmx_control_verify(vmcs12->pin_based_vm_exec_control,
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nested_vmx_pinbased_ctls_low, nested_vmx_pinbased_ctls_high) ||
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!vmx_control_verify(vmcs12->vm_exit_controls,
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nested_vmx_exit_ctls_low, nested_vmx_exit_ctls_high) ||
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nested_vmx_true_exit_ctls_low,
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nested_vmx_exit_ctls_high) ||
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!vmx_control_verify(vmcs12->vm_entry_controls,
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nested_vmx_entry_ctls_low, nested_vmx_entry_ctls_high))
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nested_vmx_true_entry_ctls_low,
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nested_vmx_entry_ctls_high))
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{
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nested_vmx_failValid(vcpu, VMXERR_ENTRY_INVALID_CONTROL_FIELD);
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return 1;
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@ -8222,6 +8248,9 @@ static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch)
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vmx->nested.vmcs01_tsc_offset = vmcs_read64(TSC_OFFSET);
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if (!(vmcs12->vm_entry_controls & VM_ENTRY_LOAD_DEBUG_CONTROLS))
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vmx->nested.vmcs01_debugctl = vmcs_read64(GUEST_IA32_DEBUGCTL);
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cpu = get_cpu();
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vmx->loaded_vmcs = vmcs02;
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vmx_vcpu_put(vcpu);
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@ -8399,7 +8428,6 @@ static void prepare_vmcs12(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12,
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vmcs12->guest_cr0 = vmcs12_guest_cr0(vcpu, vmcs12);
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vmcs12->guest_cr4 = vmcs12_guest_cr4(vcpu, vmcs12);
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kvm_get_dr(vcpu, 7, (unsigned long *)&vmcs12->guest_dr7);
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vmcs12->guest_rsp = kvm_register_read(vcpu, VCPU_REGS_RSP);
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vmcs12->guest_rip = kvm_register_read(vcpu, VCPU_REGS_RIP);
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vmcs12->guest_rflags = vmcs_readl(GUEST_RFLAGS);
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@ -8478,9 +8506,13 @@ static void prepare_vmcs12(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12,
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(vmcs12->vm_entry_controls & ~VM_ENTRY_IA32E_MODE) |
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(vm_entry_controls_get(to_vmx(vcpu)) & VM_ENTRY_IA32E_MODE);
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if (vmcs12->vm_exit_controls & VM_EXIT_SAVE_DEBUG_CONTROLS) {
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kvm_get_dr(vcpu, 7, (unsigned long *)&vmcs12->guest_dr7);
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vmcs12->guest_ia32_debugctl = vmcs_read64(GUEST_IA32_DEBUGCTL);
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}
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/* TODO: These cannot have changed unless we have MSR bitmaps and
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* the relevant bit asks not to trap the change */
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vmcs12->guest_ia32_debugctl = vmcs_read64(GUEST_IA32_DEBUGCTL);
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if (vmcs12->vm_exit_controls & VM_EXIT_SAVE_IA32_PAT)
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vmcs12->guest_ia32_pat = vmcs_read64(GUEST_IA32_PAT);
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if (vmcs12->vm_exit_controls & VM_EXIT_SAVE_IA32_EFER)
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