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

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Message-ID: <4F9EF8C2.7030103@zytor.com>
Date:	Mon, 30 Apr 2012 13:40:34 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Anthony Liguori <anthony@...emonkey.ws>
CC:	"Michael S. Tsirkin" <mst@...hat.com>, Avi Kivity <avi@...hat.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org, davej@...hat.com
Subject: Re: [PATCH] kvm: fix cpuid eax

On 04/30/2012 01:37 PM, Anthony Liguori wrote:
> On 04/30/2012 09:39 AM, 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.
> 
> What KVM does here predates Xen and Hyper-V.
> 
> This is an ABI breaker.
> 

What Intel and AMD have done here predates KVM...

What exactly relies on a zero here?

	-hpa

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