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| author | Juergen Gross <jgross@suse.com> | 2017-04-12 08:27:07 +0200 |
|---|---|---|
| committer | Juergen Gross <jgross@suse.com> | 2017-05-02 11:13:42 +0200 |
| commit | fd9145fd270c7d152853219b8b44210026fa3c02 (patch) | |
| tree | 92b923bbd5770407a78592b6f1b66f297c1e7e4c | |
| parent | x86/xen: don't indicate DCA support in pv domains (diff) | |
| download | linux-fd9145fd270c7d152853219b8b44210026fa3c02.tar.xz linux-fd9145fd270c7d152853219b8b44210026fa3c02.zip | |
x86/xen: use capabilities instead of fake cpuid values for aperf
When running as pv domain xen_cpuid() is being used instead of
native_cpuid(). In xen_cpuid() the aperf/mperf feature is indicated
as not being present by special casing the related cpuid leaf.
Instead of delivering fake cpuid values clear the cpu capability bit
for aperf/mperf instead.
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
| -rw-r--r-- | arch/x86/xen/enlighten_pv.c | 9 |
1 files changed, 1 insertions, 8 deletions
diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c index bd69868909b4..4c8cd7278189 100644 --- a/arch/x86/xen/enlighten_pv.c +++ b/arch/x86/xen/enlighten_pv.c @@ -165,9 +165,6 @@ xen_running_on_version_or_later(unsigned int major, unsigned int minor) return false; } -#define CPUID_THERM_POWER_LEAF 6 -#define APERFMPERF_PRESENT 0 - static __read_mostly unsigned int cpuid_leaf1_edx_mask = ~0; static __read_mostly unsigned int cpuid_leaf1_ecx_mask = ~0; @@ -201,11 +198,6 @@ static void xen_cpuid(unsigned int *ax, unsigned int *bx, *dx = cpuid_leaf5_edx_val; return; - case CPUID_THERM_POWER_LEAF: - /* Disabling APERFMPERF for kernel usage */ - maskecx = ~(1 << APERFMPERF_PRESENT); - break; - case 0xb: /* Suppress extended topology stuff */ maskebx = 0; @@ -332,6 +324,7 @@ static void __init xen_init_capabilities(void) setup_clear_cpu_cap(X86_BUG_SYSRET_SS_ATTRS); setup_force_cpu_cap(X86_FEATURE_XENPV); setup_clear_cpu_cap(X86_FEATURE_DCA); + setup_clear_cpu_cap(X86_FEATURE_APERFMPERF); } static void xen_set_debugreg(int reg, unsigned long val) |