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x86, amd, xen: Avoid NULL pointer paravirt references
author
Konrad Rzeszutek Wilk
<konrad@darnok.org>
Wed, 30 May 2012 22:23:56 +0000
(18:23 -0400)
committer
Ben Hutchings
<ben@decadent.org.uk>
Sun, 10 Jun 2012 13:41:48 +0000
(14:41 +0100)
commit
1ab46fd319bcf1fcd9fb6311727d532b580e4eba
upstream.
Stub out MSR methods that aren't actually needed. This fixes a crash
as Xen Dom0 on AMD Trinity systems. A bigger patch should be added to
remove the paravirt machinery completely for the methods which
apparently have no users!
Reported-by: Andre Przywara <andre.przywara@amd.com>
Link:
http://lkml.kernel.org/r/20120530222356.GA28417@andromeda.dapyr.net
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
arch/x86/xen/enlighten.c
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diff --git
a/arch/x86/xen/enlighten.c
b/arch/x86/xen/enlighten.c
index
e7c920b
..
cca659e
100644
(file)
--- a/
arch/x86/xen/enlighten.c
+++ b/
arch/x86/xen/enlighten.c
@@
-982,7
+982,10
@@
static const struct pv_cpu_ops xen_cpu_ops __initconst = {
.wbinvd = native_wbinvd,
.read_msr = native_read_msr_safe,
+ .rdmsr_regs = native_rdmsr_safe_regs,
.write_msr = xen_write_msr_safe,
+ .wrmsr_regs = native_wrmsr_safe_regs,
+
.read_tsc = native_read_tsc,
.read_pmc = native_read_pmc,