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SubjectRe: [RFC Part2 PATCH v3 24/26] KVM: SVM: Clear C-bit from the page fault address
On Mon, Jul 24, 2017 at 03:03:01PM -0500, Brijesh Singh wrote:
> When SEV is active, on #NPF the page fault address will contain C-bit.

"... contain the C-bit."

> We must clear the C-bit before handling the fault.
>
> Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
> ---
> arch/x86/kvm/svm.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
> index 0bbd050..64b9f60 100644
> --- a/arch/x86/kvm/svm.c
> +++ b/arch/x86/kvm/svm.c
> @@ -2321,7 +2321,7 @@ static void svm_set_dr7(struct kvm_vcpu *vcpu, unsigned long value)
>
> static int pf_interception(struct vcpu_svm *svm)
> {
> - u64 fault_address = svm->vmcb->control.exit_info_2;
> + u64 fault_address = __sme_clr(svm->vmcb->control.exit_info_2);
> u64 error_code = svm->vmcb->control.exit_info_1;
>
> return kvm_handle_page_fault(&svm->vcpu, error_code, fault_address,
> --

Otherwise:

Reviewed-by: Borislav Petkov <bp@suse.de>

--
Regards/Gruss,
Boris.

SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
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