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xen/x86: Don't try to write syscall-related MSRs for PV guests

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For PV guests these registers are set up by hypervisor and thus
should not be written by the guest. The comment in xen_write_msr_safe()
says so but we still write the MSRs, causing the hypervisor to
print a warning.

Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
This commit is contained in:
Boris Ostrovsky 2015-09-21 09:09:28 -04:00 committed by David Vrabel
parent 24f775a660
commit 2ecf91b6d8
1 changed files with 1 additions and 0 deletions
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arch/x86/xen/enlighten.c
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@ -1077,6 +1077,7 @@ static int xen_write_msr_safe(unsigned int msr, unsigned low, unsigned high)
/* Fast syscall setup is all done in hypercalls, so
these are all ignored. Stub them out here to stop
Xen console noise. */
break;
default:
if (!pmu_msr_write(msr, low, high, &ret))