From: Joerg Roedel <joro@8bytes.org>
To: Avi Kivity <avi@redhat.com>
Cc: Zachary Amsden <zamsden@redhat.com>,
Joerg Roedel <joerg.roedel@amd.com>, kvm <kvm@vger.kernel.org>
Subject: Re: Nested SVM and migration
Date: Sun, 21 Feb 2010 14:09:15 +0100 [thread overview]
Message-ID: <20100221130915.GB26465@8bytes.org> (raw)
In-Reply-To: <4B812CE9.2070107@redhat.com>
On Sun, Feb 21, 2010 at 02:54:01PM +0200, Avi Kivity wrote:
> So, if some other cpu (or the guest itself, with appropriate
> permissions) modifies the msr permission bitmap, svm will not notice
> this? svm loads the bitmap during entry?
Yes.
> I don't think you can tell, unless the host cpu modifying the vmcb is
> synchronized with the guest (or the guest modifies its own vmcb). But
> this is all academic.
Hmm, another thing comes to mind. We would need some redesign of the
nested_svm code to allow userspace to put a vcpu directly into nested
state. With the MSR approach, all userspace does is to write MSRs into
the vcpu before the first run?
Joerg
next prev parent reply other threads:[~2010-02-21 13:09 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-20 19:14 Nested SVM and migration Zachary Amsden
2010-02-20 20:18 ` Joerg Roedel
2010-02-20 23:26 ` Zachary Amsden
2010-02-21 12:10 ` Joerg Roedel
2010-02-21 12:24 ` Avi Kivity
2010-02-21 12:41 ` Joerg Roedel
2010-02-21 12:54 ` Avi Kivity
2010-02-21 13:09 ` Joerg Roedel [this message]
2010-02-21 13:14 ` Avi Kivity
[not found] ` <4B8137E7.4030001@redhat.com>
[not found] ` <20100221144352.GC26465@8bytes.org>
2010-02-22 16:54 ` Zachary Amsden
[not found] ` <4B814C41.7010105@redhat.com>
[not found] ` <20100221155624.GD26465@8bytes.org>
2010-02-22 16:56 ` Zachary Amsden
2010-02-22 16:59 ` Avi Kivity
2010-02-22 16:46 ` Zachary Amsden
2010-02-22 17:07 ` Joerg Roedel
2010-02-24 15:23 ` Joerg Roedel
2010-02-24 20:21 ` Zachary Amsden
2010-02-22 16:42 ` Zachary Amsden
2010-02-22 16:44 ` Avi Kivity
2010-02-22 17:00 ` Zachary Amsden
2010-02-22 17:02 ` Avi Kivity
2010-02-22 17:07 ` Zachary Amsden
2010-02-22 17:11 ` Avi Kivity
2010-02-22 17:24 ` Zachary Amsden
2010-02-22 16:39 ` Zachary Amsden
2010-02-21 7:23 ` Avi Kivity
2010-02-21 7:46 ` Gleb Natapov
2010-02-21 8:12 ` Avi Kivity
2010-02-21 12:18 ` Joerg Roedel
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