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| author |   Boris Ostrovsky <boris.ostrovsky@oracle.com> | 2015-09-21 09:09:28 -0400 |
|---|---|---|
| committer |   David Vrabel <david.vrabel@citrix.com> | 2015-09-28 14:48:52 +0100 |
| commit | 2ecf91b6d8b0ee8ef38aa7ea2a0fe0cd57b6ca50 (patch) | |
| tree | e854923e5165a1f27f9781345bd74c54c9a30a7d /arch/x86/xen | |
| parent | xen: use correct type for HYPERVISOR_memory_op() (diff) | |
| download | linux-dev-2ecf91b6d8b0ee8ef38aa7ea2a0fe0cd57b6ca50.tar.xz linux-dev-2ecf91b6d8b0ee8ef38aa7ea2a0fe0cd57b6ca50.zip | |
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>
Diffstat (limited to 'arch/x86/xen')
| -rw-r--r-- | arch/x86/xen/enlighten.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c index 30d12afe52ed..1f1dbd2949a4 100644 --- a/arch/x86/xen/enlighten.c +++ b/arch/x86/xen/enlighten.c @@ -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)) |