From: Keir Fraser <keir@xensource.com>
To: Jan Beulich <jbeulich@novell.com>, xen-devel@lists.xensource.com
Subject: Re: VMX: emulated guest use SYSENTER MSRs
Date: Fri, 06 Jul 2007 13:52:37 +0100 [thread overview]
Message-ID: <C2B3F9A5.11FDC%keir@xensource.com> (raw)
In-Reply-To: <468E548C.76E4.0078.0@novell.com>
Probably because the existing code must remain anyway (since not all VMX
CPUs support the MSR bitmap), and the benefit of avoiding the intercepts on
CPUs that do support it would have entirely negligible performance benefit,
since the MSRs are written only at start of day. We could add calls to avoid
the intercepts anyway though, if you want to provide a patch.
-- Keir
On 6/7/07 13:41, "Jan Beulich" <jbeulich@novell.com> wrote:
> What is the reason for not simply clearing the MSR bitmap bits for these three
> MSRs, and rather handling the reads/writes in software?
>
> Jan
>
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xensource.com
> http://lists.xensource.com/xen-devel
next prev parent reply other threads:[~2007-07-06 12:52 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-07-06 12:41 VMX: emulated guest use SYSENTER MSRs Jan Beulich
2007-07-06 12:52 ` Keir Fraser [this message]
2007-07-07 7:48 ` Li, Xin B
2007-07-07 8:52 ` Keir Fraser
2007-07-07 8:57 ` Li, Xin B
2007-07-09 9:05 ` Jan Beulich
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