From: Tim Deegan <Tim.Deegan@citrix.com>
To: Christoph Egger <Christoph.Egger@amd.com>
Cc: "xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>
Subject: Re: [PATCH 10/14] Nested Virtualization: svm specific implementation
Date: Tue, 17 Aug 2010 17:57:55 +0100 [thread overview]
Message-ID: <20100817165755.GD20252@whitby.uk.xensource.com> (raw)
In-Reply-To: <201008171749.55377.Christoph.Egger@amd.com>
At 16:49 +0100 on 17 Aug (1282063795), Christoph Egger wrote:
> > Can you explain why we shouldn't sync the vTPR and the vlapic state when
> > the guest is in nested mode?
>
> When the vcpu is in guest mode then v->arch.hvm_svm.vmcb->vintr.fields.tpr
> represents the tpr of the l2 guest. The l2 guest is not allowed to touch the
> l1 guest's vTPR.
Hmmm. I'm not sure I understand exactly what the hardware vTPR should
contain when the L2 is running; I'll have to think back about exactly
what the sync of vtpr <-> vlapic means and whether the L2 guest can
cause surprising things to happen by setting the vTPR.
Tim.
--
Tim Deegan <Tim.Deegan@citrix.com>
Principal Software Engineer, XenServer Engineering
Citrix Systems UK Ltd. (Company #02937203, SL9 0BG)
next prev parent reply other threads:[~2010-08-17 16:57 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-08-05 15:04 [PATCH 10/14] Nested Virtualization: svm specific implementation Christoph Egger
2010-08-09 12:57 ` Tim Deegan
2010-08-17 15:49 ` Christoph Egger
2010-08-17 16:57 ` Tim Deegan [this message]
2010-08-18 7:48 ` Christoph Egger
2010-08-18 10:45 ` Tim Deegan
2010-08-18 10:54 ` Christoph Egger
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