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authorMarcelo Tosatti <mtosatti@redhat.com>2014-04-27 05:30:23 +0400
committerPaolo Bonzini <pbonzini@redhat.com>2014-04-29 17:22:43 +0400
commite4c9a5a17567f8ea975bdcfdd1bf9d63965de6c9 (patch)
tree15e1ab5e94d2f606171fd781029cde2e06cd5247 /arch/x86/kvm/cpuid.c
parente9545b9f8aeb63e05818e4b3250057260bc072aa (diff)
downloadlinux-e4c9a5a17567f8ea975bdcfdd1bf9d63965de6c9.tar.xz
KVM: x86: expose invariant tsc cpuid bit (v2)
Invariant TSC is a property of TSC, no additional support code necessary. Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/cpuid.c')
-rw-r--r--arch/x86/kvm/cpuid.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index f47a104a749c..333b88db22fe 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -495,6 +495,13 @@ static inline int __do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
entry->ecx &= kvm_supported_word6_x86_features;
cpuid_mask(&entry->ecx, 6);
break;
+ case 0x80000007: /* Advanced power management */
+ /* invariant TSC is CPUID.80000007H:EDX[8] */
+ entry->edx &= (1 << 8);
+ /* mask against host */
+ entry->edx &= boot_cpu_data.x86_power;
+ entry->eax = entry->ebx = entry->ecx = 0;
+ break;
case 0x80000008: {
unsigned g_phys_as = (entry->eax >> 16) & 0xff;
unsigned virt_as = max((entry->eax >> 8) & 0xff, 48U);
@@ -525,7 +532,6 @@ static inline int __do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
case 3: /* Processor serial number */
case 5: /* MONITOR/MWAIT */
case 6: /* Thermal management */
- case 0x80000007: /* Advanced power management */
case 0xC0000002:
case 0xC0000003:
case 0xC0000004: