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SubjectRe: [PATCH v6 2/3] KVM: nVMX: Validate the IA32_BNDCFGS on nested VM-entry
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On 06/11/2017 01:54, Wanpeng Li wrote:
> From: Wanpeng Li <wanpeng.li@hotmail.com>
>
> According to the SDM, if the "load IA32_BNDCFGS" VM-entry controls is 1, the
> following checks are performed on the field for the IA32_BNDCFGS MSR:
> - Bits reserved in the IA32_BNDCFGS MSR must be 0.
> - The linear address in bits 63:12 must be canonical.
>
> Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
> Cc: Paolo Bonzini <pbonzini@redhat.com>
> Cc: Radim Krčmář <rkrcmar@redhat.com>
> Cc: Jim Mattson <jmattson@google.com>
> Signed-off-by: Wanpeng Li <wanpeng.li@hotmail.com>
> ---
> v5 -> v6:
> * keep the right conjunct
> v3 -> v4:
> * simply condition
> * use && instead of nested "if"s
>
> arch/x86/kvm/vmx.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
> index e6c8ffa..6cf3972 100644
> --- a/arch/x86/kvm/vmx.c
> +++ b/arch/x86/kvm/vmx.c
> @@ -10805,6 +10805,11 @@ static int check_vmentry_postreqs(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12,
> return 1;
> }
>
> + if ((vmcs12->vm_entry_controls & VM_ENTRY_LOAD_BNDCFGS) &&
> + (is_noncanonical_address(vmcs12->guest_bndcfgs & PAGE_MASK, vcpu) ||
> + (vmcs12->guest_bndcfgs & MSR_IA32_BNDCFGS_RSVD)))
> + return 1;
> +
> return 0;
> }
>
>

Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>

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