From: Zachary Amsden <zamsden@redhat.com>
To: Joerg Roedel <joerg.roedel@amd.com>
Cc: Joerg Roedel <joro@8bytes.org>, Avi Kivity <avi@redhat.com>,
kvm <kvm@vger.kernel.org>
Subject: Re: Nested SVM and migration
Date: Wed, 24 Feb 2010 10:21:44 -1000 [thread overview]
Message-ID: <4B858A58.3080507@redhat.com> (raw)
In-Reply-To: <20100224152325.GA3168@amd.com>
On 02/24/2010 05:23 AM, Joerg Roedel wrote:
> On Sun, Feb 21, 2010 at 02:09:15PM +0100, Joerg Roedel wrote:
>
>> 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.
>>
> Talked again with a few people about it and the architectural answer is
> a bit different. The right answer to that is:
>
> The cpu is allowed to load the msr permission map to internal state, but
> not required to do it by the architecture. The result of changing the
> msr permission map of a running vmcb is undefined.
>
> So we are fine with the way nested svm does it. And we don't need to
> care about that situation at all and just migrate whats in guest memory.
>
Awesome! Thanks for checking it out.
next prev parent reply other threads:[~2010-02-24 20:21 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
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 [this message]
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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4B858A58.3080507@redhat.com \
--to=zamsden@redhat.com \
--cc=avi@redhat.com \
--cc=joerg.roedel@amd.com \
--cc=joro@8bytes.org \
--cc=kvm@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox