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authorLiu, Jinsong <jinsong.liu@intel.com>2012-07-03 02:35:10 +0800
committerMarcelo Tosatti <mtosatti@redhat.com>2012-07-03 17:36:32 -0300
commita75b3e0f641a68b7cdd4bbe4ed1b60f963bf2b62 (patch)
tree289b00093dcd217b82b37b93aa47a83bd80ba657 /target-i386/kvm.c
parentbfee7546df51c08e395dc8a7676a5c7f20186fee (diff)
kvm: expose tsc deadline timer feature to guest
This patch exposes tsc deadline timer feature to guest if 1). in-kernel irqchip is used, and 2). kvm has emulated tsc deadline timer, and 3). user authorize the feature exposing via -cpu or +/- tsc-deadline Signed-off-by: Liu, Jinsong <jinsong.liu@intel.com> Reviewed-by: Eduardo Habkost <ehabkost@redhat.com> Acked-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Diffstat (limited to 'target-i386/kvm.c')
-rw-r--r--target-i386/kvm.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/target-i386/kvm.c b/target-i386/kvm.c
index 0d0d8f69d3..52b577fe2b 100644
--- a/target-i386/kvm.c
+++ b/target-i386/kvm.c
@@ -361,8 +361,13 @@ int kvm_arch_init_vcpu(CPUX86State *env)
env->cpuid_features &= kvm_arch_get_supported_cpuid(s, 1, 0, R_EDX);
i = env->cpuid_ext_features & CPUID_EXT_HYPERVISOR;
+ j = env->cpuid_ext_features & CPUID_EXT_TSC_DEADLINE_TIMER;
env->cpuid_ext_features &= kvm_arch_get_supported_cpuid(s, 1, 0, R_ECX);
env->cpuid_ext_features |= i;
+ if (j && kvm_irqchip_in_kernel() &&
+ kvm_check_extension(s, KVM_CAP_TSC_DEADLINE_TIMER)) {
+ env->cpuid_ext_features |= CPUID_EXT_TSC_DEADLINE_TIMER;
+ }
env->cpuid_ext2_features &= kvm_arch_get_supported_cpuid(s, 0x80000001,
0, R_EDX);