lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

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

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

1
arch/x86/xen/enlighten.c
View File

@@ -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 /* Fast syscall setup is all done in hypercalls, so
these are all ignored. Stub them out here to stop these are all ignored. Stub them out here to stop
Xen console noise. */ Xen console noise. */
break;
default: default:
if (!pmu_msr_write(msr, low, high, &ret)) if (!pmu_msr_write(msr, low, high, &ret))