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x86, amd, xen: Avoid NULL pointer paravirt references 

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>
Cc: <stable@vger.kernel.org>
This commit is contained in:
Konrad Rzeszutek Wilk 2012-05-30 18:23:56 -04:00 committed by H. Peter Anvin
parent 2da06af810
commit 1ab46fd319
1 changed files with 3 additions and 0 deletions
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3
arch/x86/xen/enlighten.c
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@ -1116,7 +1116,10 @@ static const struct pv_cpu_ops xen_cpu_ops __initconst = {
.wbinvd = native_wbinvd, .wbinvd = native_wbinvd,
.read_msr = native_read_msr_safe, .read_msr = native_read_msr_safe,
.rdmsr_regs = native_rdmsr_safe_regs,
.write_msr = xen_write_msr_safe, .write_msr = xen_write_msr_safe,
.wrmsr_regs = native_wrmsr_safe_regs,
.read_tsc = native_read_tsc, .read_tsc = native_read_tsc,
.read_pmc = native_read_pmc, .read_pmc = native_read_pmc,