linux-kernel - Re: [PATCH] kvm: fix cpuid eax

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Message-ID: <20120501072425.GC22191@redhat.com>
Date:	Tue, 1 May 2012 10:24:25 +0300
From:	Gleb Natapov <gleb@...hat.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	Avi Kivity <avi@...hat.com>, Marcelo Tosatti <mtosatti@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org, davej@...hat.com
Subject: Re: [PATCH] kvm: fix cpuid eax

On Mon, Apr 30, 2012 at 05:39:03PM +0300, Michael S. Tsirkin wrote:
> cpuid eax should return the max leaf so that
> guests can find out the valid range.
> This matches Xen et al.
> 
> Tested using -cpu host.
> 
> Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
Acked-by: Gleb Natapov <gleb@...hat.com>

> ---
>  arch/x86/kvm/cpuid.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
> index 7d00d2d..bda4877 100644
> --- a/arch/x86/kvm/cpuid.c
> +++ b/arch/x86/kvm/cpuid.c
> @@ -397,7 +397,7 @@ static int do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
>  	case KVM_CPUID_SIGNATURE: {
>  		char signature[12] = "KVMKVMKVM\0\0";
>  		u32 *sigptr = (u32 *)signature;
> -		entry->eax = 0;
> +		entry->eax = KVM_CPUID_FEATURES;
>  		entry->ebx = sigptr[0];
>  		entry->ecx = sigptr[1];
>  		entry->edx = sigptr[2];
> -- 
> MST
> --
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--
			Gleb.
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