From: "Joerg Roedel" <joerg.roedel-5C7GfCeVMHo@public.gmane.org>
To: "Avi Kivity" <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
Cc: kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
Subject: Re: [PATCH] SVM: forbid guest to execute monitor/mwait
Date: Thu, 22 Mar 2007 13:46:45 +0100 [thread overview]
Message-ID: <20070322124645.GH20139@amd.com> (raw)
In-Reply-To: <460277AE.9040403-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
On Thu, Mar 22, 2007 at 02:33:50PM +0200, Avi Kivity wrote:
> Joerg Roedel wrote:
> >We agree that we should hide the monitor cpuid bit to the guest from the
> >kernel level. Allowing the guest to use mwait if its available on the
> >processor without proper virtualization would cause the processor to
> >idle in the guest mode.
> >
>
> I think it can be safely done from userspace, as long as host integrity is not compromised.
Ok. This way is also most efficient because it does not require any
further patching :) QEmu currently does not set this bit.
--
Joerg Roedel
Operating System Research Center
AMD Saxony LLC & Co. KG
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prev parent reply other threads:[~2007-03-22 12:46 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-21 18:47 [PATCH] SVM: forbid guest to execute monitor/mwait Joerg Roedel
[not found] ` <20070321184700.GA20139-5C7GfCeVMHo@public.gmane.org>
2007-03-22 7:38 ` Avi Kivity
[not found] ` <46023264.4010105-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2007-03-22 9:56 ` Joerg Roedel
[not found] ` <20070322095605.GB20139-5C7GfCeVMHo@public.gmane.org>
2007-03-22 10:06 ` Avi Kivity
[not found] ` <46025528.5010707-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2007-03-22 10:17 ` Joerg Roedel
[not found] ` <20070322101729.GC20139-5C7GfCeVMHo@public.gmane.org>
2007-03-22 10:42 ` Avi Kivity
[not found] ` <46025D94.8050606-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2007-03-22 11:07 ` Joerg Roedel
[not found] ` <20070322110733.GE20139-5C7GfCeVMHo@public.gmane.org>
2007-03-22 11:40 ` Avi Kivity
[not found] ` <46026B2A.2080501-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2007-03-22 11:56 ` Joerg Roedel
[not found] ` <20070322115602.GF20139-5C7GfCeVMHo@public.gmane.org>
2007-03-22 12:01 ` Avi Kivity
[not found] ` <4602700E.1030500-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2007-03-22 12:22 ` Joerg Roedel
[not found] ` <20070322122249.GG20139-5C7GfCeVMHo@public.gmane.org>
2007-03-22 12:33 ` Avi Kivity
[not found] ` <460277AE.9040403-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2007-03-22 12:46 ` Joerg Roedel [this message]
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