Re: [PATCH] KVM: nEPT: reset PDPTR register cache on nested vmentry emulation

[Paolo Bonzini <pbonzini@redhat.com>]

Il 02/09/2013 14:25, Gleb Natapov ha scritto:
> After nested vmentry stale cache can be used to reload L2 PDPTR pointers
> which will cause L2 guest to fail. Fix it by invalidating cache on nested
> vmentry emulation.
> 
> https://bugzilla.kernel.org/show_bug.cgi?id=60830
> 
> Signed-off-by: Gleb Natapov <gleb@redhat.com>
> diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
> index 57b4e12..6f69aac 100644
> --- a/arch/x86/kvm/vmx.c
> +++ b/arch/x86/kvm/vmx.c
> @@ -7765,6 +7765,10 @@ static void prepare_vmcs02(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12)
>  		vmcs_write64(GUEST_PDPTR1, vmcs12->guest_pdptr1);
>  		vmcs_write64(GUEST_PDPTR2, vmcs12->guest_pdptr2);
>  		vmcs_write64(GUEST_PDPTR3, vmcs12->guest_pdptr3);
> +		__clear_bit(VCPU_EXREG_PDPTR,
> +				(unsigned long *)&vcpu->arch.regs_avail);
> +		__clear_bit(VCPU_EXREG_PDPTR,
> +				(unsigned long *)&vcpu->arch.regs_dirty);
>  	}
>  
>  	kvm_register_write(vcpu, VCPU_REGS_RSP, vmcs12->guest_rsp);
> --
> 			Gleb.
> --
> To unsubscribe from this list: send the line "unsubscribe kvm" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> 

Applied to kvm/queue for 3.12, thanks.

Paolo