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authorPaolo Bonzini <pbonzini@redhat.com>2014-01-27 14:49:40 +0100
committerPaolo Bonzini <pbonzini@redhat.com>2014-01-29 18:11:54 +0100
commit1c300a40772dae829b91dad634999a6a522c0829 (patch)
tree14707e507380a59196f37d27faa469c473372859 /arch
parent5f66b62095d028b70a322df15e8f9ffcdbcb474c (diff)
downloadlinux-linaro-stable-1c300a40772dae829b91dad634999a6a522c0829.tar.gz
x86, kvm: cache the base of the KVM cpuid leaves
It is unnecessary to go through hypervisor_cpuid_base every time a leaf is found (which will be every time a feature is requested after the next patch). Fixes: 1085ba7f552d84aa8ac0ae903fa8d0cc2ff9f79d Cc: stable@vger.kernel.org Cc: mtosatti@redhat.com Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/include/asm/kvm_para.h22
-rw-r--r--arch/x86/kernel/kvm.c27
2 files changed, 33 insertions, 16 deletions
diff --git a/arch/x86/include/asm/kvm_para.h b/arch/x86/include/asm/kvm_para.h
index 1df115909758..1679cc799b26 100644
--- a/arch/x86/include/asm/kvm_para.h
+++ b/arch/x86/include/asm/kvm_para.h
@@ -85,28 +85,13 @@ static inline long kvm_hypercall4(unsigned int nr, unsigned long p1,
return ret;
}
-static inline uint32_t kvm_cpuid_base(void)
-{
- if (boot_cpu_data.cpuid_level < 0)
- return 0; /* So we don't blow up on old processors */
-
- if (cpu_has_hypervisor)
- return hypervisor_cpuid_base("KVMKVMKVM\0\0\0", 0);
-
- return 0;
-}
-
-static inline bool kvm_para_available(void)
-{
- return kvm_cpuid_base() != 0;
-}
-
static inline unsigned int kvm_arch_para_features(void)
{
return cpuid_eax(KVM_CPUID_FEATURES);
}
#ifdef CONFIG_KVM_GUEST
+bool kvm_para_available(void);
void __init kvm_guest_init(void);
void kvm_async_pf_task_wait(u32 token);
void kvm_async_pf_task_wake(u32 token);
@@ -126,6 +111,11 @@ static inline void kvm_spinlock_init(void)
#define kvm_async_pf_task_wait(T) do {} while(0)
#define kvm_async_pf_task_wake(T) do {} while(0)
+static inline bool kvm_para_available(void)
+{
+ return 0;
+}
+
static inline u32 kvm_read_and_reset_pf_reason(void)
{
return 0;
diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c
index 6dd802c6d780..0823003770fc 100644
--- a/arch/x86/kernel/kvm.c
+++ b/arch/x86/kernel/kvm.c
@@ -500,6 +500,33 @@ void __init kvm_guest_init(void)
#endif
}
+static noinline uint32_t __kvm_cpuid_base(void)
+{
+ if (boot_cpu_data.cpuid_level < 0)
+ return 0; /* So we don't blow up on old processors */
+
+ if (cpu_has_hypervisor)
+ return hypervisor_cpuid_base("KVMKVMKVM\0\0\0", 0);
+
+ return 0;
+}
+
+static inline uint32_t kvm_cpuid_base(void)
+{
+ static int kvm_cpuid_base = -1;
+
+ if (kvm_cpuid_base == -1)
+ kvm_cpuid_base = __kvm_cpuid_base();
+
+ return kvm_cpuid_base;
+}
+
+bool kvm_para_available(void)
+{
+ return kvm_cpuid_base() != 0;
+}
+EXPORT_SYMBOL_GPL(kvm_para_available);
+
static uint32_t __init kvm_detect(void)
{
return kvm_cpuid_base();