Re: [Xen-devel] fewer CPUID instructions is monitored/emulated i

To:	"K.C. Lee" <kcl.joseph@xxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject:	Re: [Xen-devel] fewer CPUID instructions is monitored/emulated in xen 4.0.1 than in xen 3.1.0?
From:	Keir Fraser <keir@xxxxxxx>
Date:	Thu, 07 Oct 2010 13:40:50 +0100
Cc:
Delivery-date:	Thu, 07 Oct 2010 05:41:42 -0700
Dkim-signature:	v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:sender:user-agent:date :subject:from:to:message-id:thread-topic:thread-index:in-reply-to :mime-version:content-type:content-transfer-encoding; bh=V+jFwjHOvVH7IE7fngRyrbc0+oU43tGQYAylrVDfbKw=; b=e74THSQDgdrIVgXc/u+ycwN5mLLK5z2UgrRsDrr7ie/sEvKq/37hMvv6Xc0Q282hnQ 9VxGGi0lW1igYSgY6+0RazX6I2Ee4B22NPK+C+oGY65+rpJWmVLYvslWEaLAFhEPgIm/ UmUDAIK9LgaiX5IySlAZ83hF23loAGTVe0ar4=
Domainkey-signature:	a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=sender:user-agent:date:subject:from:to:message-id:thread-topic :thread-index:in-reply-to:mime-version:content-type :content-transfer-encoding; b=PVpMBdg7mSiz7D4PH4rESX+XBcKR3SXsG2oB2/K+2L/QyEEGBtj7GAU//H8Q2tH5br ToXK4m67XQqpebOXi++lDXqpNK0v6kaTFsL2D6n9kBpyznIkXZaY8EIkst0isnoi/fYk 3q67Zrzb2Q41vjDitJ8COCJcmd1o09mhpFJ+8=
Envelope-to:	www-data@xxxxxxxxxxxxxxxxxxx
In-reply-to:	<AANLkTi=ug=2W6Prmqo7EQ0k7Ux_vYe2JsZi3+Z1rVXtX@xxxxxxxxxxxxxx>
List-help:	<mailto:xen-devel-request@lists.xensource.com?subject=help>
List-id:	Xen developer discussion <xen-devel.lists.xensource.com>
List-post:	<mailto:xen-devel@lists.xensource.com>
List-subscribe:	<http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe:	<http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
Sender:	xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
Thread-index:	ActmHN8zKNhve0Wsdk6Z9Xa2sLgXAQ==
Thread-topic:	[Xen-devel] fewer CPUID instructions is monitored/emulated in xen 4.0.1 than in xen 3.1.0?
User-agent:	Microsoft-Entourage/12.26.0.100708

Guest CPUID information gets pushed into the hypervisor from the toolstack
now. See tools/libxc/xc_cpuid_x86.c.

 -- Keir

On 07/10/2010 10:42, "K.C. Lee" <kcl.joseph@xxxxxxxxx> wrote:

> Hi,
> 
> In the function vmx_do_cpuid() of xen 4.0.1, it calls vmx_cpuid_intercept()
> which
> deal with the case where eax is 0x80000001 only,
> much less than the cases in vmx_do_cpuid() of xen 3.1.0.
> 
> Does that mean fewer instructions is monitored in xen 4.0.1? Why?
> 
> Thank you.
> 
> Sincerely,
> 
> K.C.
> 
> 
> 
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-devel



_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel

WARNING - OLD ARCHIVES

xen-devel

Re: [Xen-devel] fewer CPUID instructions is monitored/emulated in xen 4.