[Xen-changelog] [xen stable-4.3] x86/AMD: feature masking is unavailable on Fam11

[patchbot@xxxxxxx]

commit 363a215887541f104e4ccf33210979e27d119847
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Thu May 8 14:12:43 2014 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Thu May 8 14:12:43 2014 +0200

    x86/AMD: feature masking is unavailable on Fam11
    
    Reported-by: Aravind Gopalakrishnan<aravind.gopalakrishnan@xxxxxxx>
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    master commit: 70e79fad6dc6f533ff83ee23b8d13de5a696d896
    master date: 2014-04-09 16:13:25 +0200
---
 xen/arch/x86/cpu/amd.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/xen/arch/x86/cpu/amd.c b/xen/arch/x86/cpu/amd.c
index 67fa49c..1f080e7 100644
--- a/xen/arch/x86/cpu/amd.c
+++ b/xen/arch/x86/cpu/amd.c
@@ -107,6 +107,10 @@ static void __devinit set_cpuidmask(const struct 
cpuinfo_x86 *c)
        ASSERT((status == not_parsed) && (smp_processor_id() == 0));
        status = no_mask;
 
+       /* Fam11 doesn't support masking at all. */
+       if (c->x86 == 0x11)
+               return;
+
        if (~(opt_cpuid_mask_ecx & opt_cpuid_mask_edx &
              opt_cpuid_mask_ext_ecx & opt_cpuid_mask_ext_edx)) {
                feat_ecx = opt_cpuid_mask_ecx;
@@ -176,7 +180,6 @@ static void __devinit set_cpuidmask(const struct 
cpuinfo_x86 *c)
               extfeat_ecx, extfeat_edx);
 
  setmask:
-       /* FIXME check if processor supports CPUID masking */
        /* AMD processors prior to family 10h required a 32-bit password */
        if (c->x86 >= 0x10) {
                wrmsr(MSR_K8_FEATURE_MASK, feat_edx, feat_ecx);
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.3

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