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Re: [Qemu-devel] [PATCH 1/2] Fix real mode guest migration

From: Eric Blake
Subject: Re: [Qemu-devel] [PATCH 1/2] Fix real mode guest migration
Date: Mon, 22 Jul 2013 10:37:03 -0600
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130625 Thunderbird/17.0.7

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.


> +      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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