From: Radim Krčmář <rkrc...@redhat.com>
Assume that KVM would have returned the same on subsequent runs.
Abstract the memoizaiton pattern into macros and call it memorize as
adding the r makes it less obscure.
Reviewed-by: Igor Mammedov <imamm...@redhat.com>
Signed-off-by: Radim Krčmář <rkrc...@redhat.com>
Signed-off-by: Eduardo Habkost <ehabk...@redhat.com>
---
target-i386/kvm.c | 17 +++++++++++++++--
1 file changed, 15 insertions(+), 2 deletions(-)
diff --git a/target-i386/kvm.c b/target-i386/kvm.c
index 0fd6646..0472f45 100644
--- a/target-i386/kvm.c
+++ b/target-i386/kvm.c
@@ -129,10 +129,23 @@ static bool kvm_x2apic_api_set_flags(uint64_t flags)
return !kvm_vm_enable_cap(s, KVM_CAP_X2APIC_API, 0, flags);
}
+#define MEMORIZE(fn) \
+ ({ \
+ static typeof(fn) _result; \
+ static bool _memorized; \
+ \
+ if (_memorized) { \
+ return _result; \
+ } \
+ _memorized = true; \
+ _result = fn; \
+ })
+
bool kvm_enable_x2apic(void)
{
- return kvm_x2apic_api_set_flags(KVM_X2APIC_API_USE_32BIT_IDS |
- KVM_X2APIC_API_DISABLE_BROADCAST_QUIRK);
+ return MEMORIZE(
+ kvm_x2apic_api_set_flags(KVM_X2APIC_API_USE_32BIT_IDS |
+ KVM_X2APIC_API_DISABLE_BROADCAST_QUIRK));
}
static int kvm_get_tsc(CPUState *cs)
--
2.7.4
