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From: Joerg Roedel <jroedel@suse.de>
To: speck@linutronix.de
Subject: [MODERATED] Re: ***UNCHECKED*** Re: Re: [PATCH v7 3/5] NX 3
Date: Fri, 25 Oct 2019 11:45:27 +0200	[thread overview]
Message-ID: <20191025094527.GE7069@suse.de> (raw)
In-Reply-To: <201e8590-30ed-ab29-6fc2-bbeab1fb5592@redhat.com>

On Fri, Oct 25, 2019 at 11:08:25AM +0200, speck for Paolo Bonzini wrote:
> diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
> index e7970a2e8eae..8979d5e7b6f5 100644
> --- a/arch/x86/kvm/vmx/vmx.c
> +++ b/arch/x86/kvm/vmx/vmx.c
> @@ -969,17 +969,9 @@ static bool update_transition_efer(struct vcpu_vmx *vmx, int efer_offset)
>  	u64 guest_efer = vmx->vcpu.arch.efer;
>  	u64 ignore_bits = 0;
>  
> -	if (!enable_ept) {
> -		/*
> -		 * NX is needed to handle CR0.WP=1, CR4.SMEP=1.  Testing
> -		 * host CPUID is more efficient than testing guest CPUID
> -		 * or CR4.  Host SMEP is anyway a requirement for guest SMEP.
> -		 */
> -		if (boot_cpu_has(X86_FEATURE_SMEP))
> -			guest_efer |= EFER_NX;
> -		else if (!(guest_efer & EFER_NX))
> -			ignore_bits |= EFER_NX;
> -	}
> +	/* Shadow paging assumes the NX bit to be available.  */
> +	if (!enable_ept)
> +		guest_efer |= EFER_NX;
>  
>  	/*
>  	 * LMA and LME handled by hardware; SCE meaningless outside long mode.

Works with ept on and off, thanks.


	Joerg

  reply	other threads:[~2019-10-25  9:45 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-24 16:34 [MODERATED] [PATCH v7 0/5] NX 0 Paolo Bonzini
2019-10-24 16:34 ` [MODERATED] [PATCH v7 1/5] NX 1 Paolo Bonzini
2019-10-30 18:38   ` [MODERATED] " Josh Poimboeuf
2019-10-31 11:05     ` Paolo Bonzini
2019-10-24 16:34 ` [MODERATED] [PATCH v7 2/5] NX 2 Paolo Bonzini
2019-10-24 16:34 ` [MODERATED] [PATCH v7 3/5] NX 3 Paolo Bonzini
2019-10-25  8:37   ` [MODERATED] Re: ***UNCHECKED*** " Joerg Roedel
2019-10-25  8:48     ` Paolo Bonzini
2019-10-25  9:03       ` [MODERATED] Re: ***UNCHECKED*** " Joerg Roedel
2019-10-25  9:08         ` Paolo Bonzini
2019-10-25  9:45           ` Joerg Roedel [this message]
2019-10-25 10:39             ` [MODERATED] Re: ***UNCHECKED*** " Paolo Bonzini
2019-10-29 20:33               ` mark gross
2019-10-31 11:02                 ` Paolo Bonzini
2019-10-24 16:34 ` [MODERATED] [PATCH v7 4/5] NX 4 Paolo Bonzini
2019-10-24 16:34 ` [MODERATED] [PATCH v7 5/5] NX 5 Paolo Bonzini
2019-10-24 18:27 ` [MODERATED] Re: [PATCH v7 0/5] NX 0 Ben Hutchings
2019-10-24 18:56   ` Paolo Bonzini

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