[Xen-changelog] [xen stable-4.5] x86: hide MWAITX from PV domains

[patchbot@xxxxxxx]

commit 0368463ece89a400c2f63800b782929d4b5fb949
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Wed Oct 21 17:31:02 2015 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Wed Oct 21 17:31:02 2015 +0200

    x86: hide MWAITX from PV domains
    
    Since MWAIT is hidden too. (Linux starting with 4.3 is making use of
    that feature, and is checking for it without looking at the MWAIT one.)
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    master commit: 941cd44324db7eddc46cba4596fa13d505066ccf
    master date: 2015-10-13 17:17:52 +0200
---
 xen/arch/x86/traps.c             |    1 +
 xen/include/asm-x86/cpufeature.h |    1 +
 2 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/xen/arch/x86/traps.c b/xen/arch/x86/traps.c
index c037b00..1c3db47 100644
--- a/xen/arch/x86/traps.c
+++ b/xen/arch/x86/traps.c
@@ -904,6 +904,7 @@ void pv_cpuid(struct cpu_user_regs *regs)
         __clear_bit(X86_FEATURE_LWP % 32, &c);
         __clear_bit(X86_FEATURE_NODEID_MSR % 32, &c);
         __clear_bit(X86_FEATURE_TOPOEXT % 32, &c);
+        __clear_bit(X86_FEATURE_MWAITX % 32, &c);
         break;
 
     case 0x00000005: /* MONITOR/MWAIT */
diff --git a/xen/include/asm-x86/cpufeature.h b/xen/include/asm-x86/cpufeature.h
index d3bd14d..4caa4e6 100644
--- a/xen/include/asm-x86/cpufeature.h
+++ b/xen/include/asm-x86/cpufeature.h
@@ -137,6 +137,7 @@
 #define X86_FEATURE_TBM         (6*32+21) /* trailing bit manipulations */
 #define X86_FEATURE_TOPOEXT     (6*32+22) /* topology extensions CPUID leafs */
 #define X86_FEATURE_DBEXT       (6*32+26) /* data breakpoint extension */
+#define X86_FEATURE_MWAITX      (6*32+29) /* MWAIT extension (MONITORX/MWAITX) 
*/
 
 /* Intel-defined CPU features, CPUID level 0x00000007:0 (ebx), word 7 */
 #define X86_FEATURE_FSGSBASE   (7*32+ 0) /* {RD,WR}{FS,GS}BASE instructions */
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.5

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