Commit 2ecf91b6 authored Sep 21, 2015 by Boris Ostrovsky Committed by David Vrabel Sep 28, 2015

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



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>

parent 24f775a6

arch/x86/xen/enlighten.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -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))