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From: Eric Blake <eblake@redhat.com>
To: Orit Wasserman <owasserm@redhat.com>
Cc: aliguori@us.ibm.com, ehabkost@redhat.com, gleb@redhat.com,
	mtosatti@redhat.com, qemu-devel@nongnu.org, pbonzini@redhat.com,
	afaerber@suse.de
Subject: Re: [Qemu-devel] [PATCH 1/2] Fix real mode guest migration
Date: Mon, 22 Jul 2013 10:37:03 -0600	[thread overview]
Message-ID: <51ED5FAF.1040309@redhat.com> (raw)
In-Reply-To: <1374475799-18523-1-git-send-email-owasserm@redhat.com>

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On 07/22/2013 12:49 AM, Orit Wasserman wrote:
> Older KVM versions save CS dpl value to an invalid value for real mode guests
> (0x3). This patch detect this situation when loading CPU state and set all the
> segments dpl to zero.
> This will allow migration from older KVM on host without unrestricted guest
> to hosts with restricted guest support.
> For example migration from a Penryn host (with kernel 2.6.32) to
> a Westmere host.

> +    /*
> +      Real mode guest segments register DPL should be zero.
> +      Older KVM version were setting it worngly.

s/worngly/wrongly/

> +      Fixing it will allow live migration from such host that don't have
> +      restricted guest support to an host with unrestricted guest support

s/an host/a host/

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org


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      parent reply	other threads:[~2013-07-22 16:37 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-07-22  6:49 [Qemu-devel] [PATCH 1/2] Fix real mode guest migration Orit Wasserman
2013-07-22  6:49 ` [Qemu-devel] [PATCH 2/2] Fix real mode guest segments dpl value in savevm Orit Wasserman
2013-07-22  9:49 ` [Qemu-devel] [PATCH 1/2] Fix real mode guest migration Paolo Bonzini
2013-07-22  9:58   ` Gleb Natapov
2013-07-22 10:10   ` Orit Wasserman
2013-07-22 10:14     ` Paolo Bonzini
2013-07-22 13:20       ` Eduardo Habkost
2013-07-22 10:33   ` Andreas Färber
2013-07-22 10:50     ` Gleb Natapov
2013-07-22 10:59     ` Orit Wasserman
2013-07-22 12:46       ` Juan Quintela
2013-07-22 17:50   ` Anthony Liguori
2013-07-22 18:50     ` Gleb Natapov
2013-07-22 10:50 ` Juan Quintela
2013-07-22 16:37 ` Eric Blake [this message]

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