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[Qemu-devel] [PATCH v4 8/8] target-i386/kvm: cache the return value of k
From: |
Radim Krčmář |
Subject: |
[Qemu-devel] [PATCH v4 8/8] target-i386/kvm: cache the return value of kvm_enable_x2apic() |
Date: |
Wed, 5 Oct 2016 15:06:57 +0200 |
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.
Signed-off-by: Radim Krčmář <address@hidden>
---
v4:
* changed the name to memorize [Igor]
* remove useless underscores in macro arguments
* merge the two macros, as it seems that the deleted one wouldn't get
other users anytime soon
---
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 0fd664648665..0472f45fd092 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)
--
2.10.0
- Re: [Qemu-devel] [PATCH v4 7/8] intel_iommu: keep buggy EIM enabled in 2.7 machine type, (continued)
- Re: [Qemu-devel] [PATCH v4 7/8] intel_iommu: keep buggy EIM enabled in 2.7 machine type, Eduardo Habkost, 2016/10/06
- Re: [Qemu-devel] [PATCH v4 7/8] intel_iommu: keep buggy EIM enabled in 2.7 machine type, Michael S. Tsirkin, 2016/10/06
- Re: [Qemu-devel] [PATCH v4 7/8] intel_iommu: keep buggy EIM enabled in 2.7 machine type, Radim Krčmář, 2016/10/06
- [Qemu-devel] Deprecating old machine-types (was Re: [PATCH v4 7/8] intel_iommu: keep buggy EIM enabled in 2.7 machine type), Eduardo Habkost, 2016/10/10
- Re: [Qemu-devel] Deprecating old machine-types (was Re: [PATCH v4 7/8] intel_iommu: keep buggy EIM enabled in 2.7 machine type), Paolo Bonzini, 2016/10/11
- Re: [Qemu-devel] Deprecating old machine-types (was Re: [PATCH v4 7/8] intel_iommu: keep buggy EIM enabled in 2.7 machine type), Daniel P. Berrange, 2016/10/11
- Re: [Qemu-devel] Deprecating old machine-types (was Re: [PATCH v4 7/8] intel_iommu: keep buggy EIM enabled in 2.7 machine type), Paolo Bonzini, 2016/10/11
- Re: [Qemu-devel] Deprecating old machine-types (was Re: [PATCH v4 7/8] intel_iommu: keep buggy EIM enabled in 2.7 machine type), Eduardo Habkost, 2016/10/14
- Re: [Qemu-devel] [PATCH v4 7/8] intel_iommu: keep buggy EIM enabled in 2.7 machine type, Radim Krčmář, 2016/10/06
- Re: [Qemu-devel] [PATCH v4 7/8] intel_iommu: keep buggy EIM enabled in 2.7 machine type, Michael S. Tsirkin, 2016/10/09
[Qemu-devel] [PATCH v4 8/8] target-i386/kvm: cache the return value of kvm_enable_x2apic(),
Radim Krčmář <=