[Xen-changelog] [xen stable-4.4] x86: correctly check for sub-leaf zero of leaf 7 in pv_cpuid()

[patchbot@xxxxxxx]

commit ce36be75fce0d777fec0dc1847254926467a69d3
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Tue Feb 3 12:33:06 2015 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Tue Feb 3 12:33:06 2015 +0100

    x86: correctly check for sub-leaf zero of leaf 7 in pv_cpuid()
    
    Only the low 32 bits are relevant.
    
    For consistency also change a cast on regs->eax to regs->_eax.
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    master commit: ae1edef1ae33f3bcff2580116ae2b7c9ffef42f2
    master date: 2015-01-22 12:48:40 +0100
---
 xen/arch/x86/traps.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/xen/arch/x86/traps.c b/xen/arch/x86/traps.c
index dfff472..9b03c17 100644
--- a/xen/arch/x86/traps.c
+++ b/xen/arch/x86/traps.c
@@ -787,7 +787,7 @@ void pv_cpuid(struct cpu_user_regs *regs)
         __clear_bit(X86_FEATURE_PSE36, &d);
     }
 
-    switch ( (uint32_t)regs->eax )
+    switch ( regs->_eax )
     {
     case 0x00000001:
         /* Modify Feature Information. */
@@ -822,7 +822,7 @@ void pv_cpuid(struct cpu_user_regs *regs)
         break;
 
     case 0x00000007:
-        if ( regs->ecx == 0 )
+        if ( regs->_ecx == 0 )
             b &= (cpufeat_mask(X86_FEATURE_BMI1) |
                   cpufeat_mask(X86_FEATURE_HLE)  |
                   cpufeat_mask(X86_FEATURE_AVX2) |
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.4

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