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SubjectRe: [PATCH v15 04/14] KVM: x86: Add #CP support in guest exception dispatch
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On 03/02/21 22:46, Sean Christopherson wrote:
>
> diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
> index dbca1687ae8e..0b6dab6915a3 100644
> --- a/arch/x86/kvm/vmx/nested.c
> +++ b/arch/x86/kvm/vmx/nested.c
> @@ -2811,7 +2811,7 @@ static int nested_check_vm_entry_controls(struct kvm_vcpu *vcpu,
> /* VM-entry interruption-info field: deliver error code */
> should_have_error_code =
> intr_type == INTR_TYPE_HARD_EXCEPTION && prot_mode &&
> - x86_exception_has_error_code(vector);
> + x86_exception_has_error_code(vcpu, vector);
> if (CC(has_error_code != should_have_error_code))
> return -EINVAL;
>
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index 28fea7ff7a86..0288d6a364bd 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -437,17 +437,20 @@ EXPORT_SYMBOL_GPL(kvm_spurious_fault);
> #define EXCPT_CONTRIBUTORY 1
> #define EXCPT_PF 2
>
> -static int exception_class(int vector)
> +static int exception_class(struct kvm_vcpu *vcpu, int vector)
> {
> switch (vector) {
> case PF_VECTOR:
> return EXCPT_PF;
> + case CP_VECTOR:
> + if (vcpu->arch.cr4_guest_rsvd_bits & X86_CR4_CET)
> + return EXCPT_BENIGN;
> + return EXCPT_CONTRIBUTORY;
> case DE_VECTOR:
> case TS_VECTOR:
> case NP_VECTOR:
> case SS_VECTOR:
> case GP_VECTOR:
> - case CP_VECTOR:
> return EXCPT_CONTRIBUTORY;
> default:
> break;
> @@ -588,8 +591,8 @@ static void kvm_multiple_exception(struct kvm_vcpu *vcpu,
> kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu);
> return;
> }
> - class1 = exception_class(prev_nr);
> - class2 = exception_class(nr);
> + class1 = exception_class(vcpu, prev_nr);
> + class2 = exception_class(vcpu, nr);
> if ((class1 == EXCPT_CONTRIBUTORY && class2 == EXCPT_CONTRIBUTORY)
> || (class1 == EXCPT_PF && class2 != EXCPT_BENIGN)) {
> /*
> diff --git a/arch/x86/kvm/x86.h b/arch/x86/kvm/x86.h
> index a14da36a30ed..dce756ffb577 100644
> --- a/arch/x86/kvm/x86.h
> +++ b/arch/x86/kvm/x86.h
> @@ -120,12 +120,16 @@ static inline bool is_la57_mode(struct kvm_vcpu *vcpu)
> #endif
> }
>
> -static inline bool x86_exception_has_error_code(unsigned int vector)
> +static inline bool x86_exception_has_error_code(struct kvm_vcpu *vcpu,
> + unsigned int vector)
> {
> static u32 exception_has_error_code = BIT(DF_VECTOR) | BIT(TS_VECTOR) |
> BIT(NP_VECTOR) | BIT(SS_VECTOR) | BIT(GP_VECTOR) |
> BIT(PF_VECTOR) | BIT(AC_VECTOR) | BIT(CP_VECTOR);
>
> + if (vector == CP_VECTOR && (vcpu->arch.cr4_guest_rsvd_bits & X86_CR4_CET))
> + return false;
> +
> return (1U << vector) & exception_has_error_code;
> }
>
>
>
>

Squashed, thanks. I made a small change to the last hunk:

if (!((1U << vector) & exception_has_error_code))
return false;

if (vector == CP_VECTOR)
return !(vcpu->arch.cr4_guest_rsvd_bits & X86_CR4_CET);

return true;

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