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authorEduardo Habkost <ehabkost@redhat.com>2014-02-19 11:58:12 -0300
committerAndreas Färber <afaerber@suse.de>2014-03-13 19:01:49 +0100
commitef02ef5f4536dba090b12360a6c862ef0e57e3bc (patch)
tree154e65257df6cb8deaa2bb9fc18cd792fa7680bf /target-i386
parent8fb4f821e93a75431973bf3a11bacd924e43816c (diff)
downloadqemu-arm-ef02ef5f4536dba090b12360a6c862ef0e57e3bc.tar.gz
target-i386: Enable x2apic by default on KVM
When on KVM mode, enable x2apic by default on all CPU models. Normally we try to keep the CPU model definitions as close as the real CPUs as possible, but x2apic can be emulated by KVM without host CPU support for x2apic, and it improves performance by reducing APIC access overhead. x2apic emulation is available on KVM since 2009 (Linux 2.6.32-rc1), there's no reason for not enabling x2apic by default when running KVM. Signed-off-by: Eduardo Habkost <ehabkost@redhat.com> Acked-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Andreas Färber <afaerber@suse.de>
Diffstat (limited to 'target-i386')
-rw-r--r--target-i386/cpu.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/target-i386/cpu.c b/target-i386/cpu.c
index 5f960acad8..ea2033215f 100644
--- a/target-i386/cpu.c
+++ b/target-i386/cpu.c
@@ -369,6 +369,7 @@ static uint32_t kvm_default_features[FEATURE_WORDS] = {
(1 << KVM_FEATURE_STEAL_TIME) |
(1 << KVM_FEATURE_PV_EOI) |
(1 << KVM_FEATURE_CLOCKSOURCE_STABLE_BIT),
+ [FEAT_1_ECX] = CPUID_EXT_X2APIC,
};
void x86_cpu_compat_disable_kvm_features(FeatureWord w, uint32_t features)