Chris Lalancette wrote:
> Attached is a patch that fixes a guest crash when booting older Linux kernels.
> The problem stems from the fact that we are currently emulating
> MSR_K7_EVNTSEL[0-3], but not emulating MSR_K7_PERFCTR[0-3]. Because of this,
> setup_k7_watchdog() in the Linux kernel receives a GPF when it attempts to
> write
> into MSR_K7_PERFCTR, which causes an OOPs.
>
> The patch fixes it by just "fake" emulating the appropriate MSRs, throwing
> away
> the data in the process. This causes the NMI watchdog to not actually work,
> but
> it's not such a big deal in a virtualized environment.
>
> Tested by myself on a RHEL-4 guest, and Joerg Roedel on a Windows XP 64-bit
> guest.
Avi,
Do you mind applying this patch for me (unless you see something wrong with
it, of course)?
Thanks,
Chris Lalancette
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