Re: KVM: SVM: Implement LBRV virtualization

Joerg Roedel
2008-02-12T16:01:52Z

On Tue, Feb 12, 2008 at 04:53:44PM +0100, Maciej Kowalczyk wrote:
> On Tue, 12 Feb 2008 16:27:07 +0100, Joerg Roedel <joerg.roedel@amd.com> wrote:
> >This little patchset implements virtualization of the Last Branch Record
> >feature (LBRV) into the KVM-AMD module where this is available in hardware. For
> >every non-LBRV capable hardware it only enables access to the 5 LBR MSRs. Without
> >this access Windows XP 64 bit crashes in the installation routine.
>
> Does it mean that it's impossible to install Windows XP x64 on older AMD processors under KVM?
> Or maybe just newer models crashed during install?
>
>

Installation of XP 64 bit should work now on every AMD system which has
support for KVM. The critical point here was the access to the MSRs.
These MSRs are virtualized in newer AMD processors (Fam10h) and
therefore I implemented this feature in this patchset too.

Joerg

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