On Wed, Sep 21, 2016 at 03:06:45PM +0200, Thomas Huth wrote:
> The MMCR2 register is available twice, one time with number 785
> (privileged access), and one time with number 769 (unprivileged,
> but it can be disabled completely). In former times, the Linux
> kernel was using the unprivileged register 769 only, but since
> commit 8dd75ccb571f3c92c ("powerpc: Use privileged SPR number
> for MMCR2"), it uses the privileged register 785 instead.
> The KVM-PR code then of course also switched to use the SPR 785,
> but this is causing older guest kernels to crash, since these
> kernels still access 769 instead. So to support older kernels
> with KVM-PR again, we have to support register 769 in KVM-PR, too.
>
> Fixes: 8dd75ccb571f3c92c48014b3dabd3d51a115ab41
> Cc: stable@xxxxxxxxxxxxxxx # v3.10+
> Signed-off-by: Thomas Huth <thuth@xxxxxxxxxx>
Thanks, applied to kvm-ppc-next.
Paul.
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