Re: [PATCH v6 1/3] target-i386: fallback vcpu's TSC rate to value returned by KVM
On Tue, Nov 24, 2015 at 11:33:55AM +0800, Haozhong Zhang wrote: > If no user-specified TSC rate is present, we will try to set > env->tsc_khz to the value returned by KVM_GET_TSC_KHZ. This patch does > not change the current functionality of QEMU and just prepares for later > patches to enable migrating vcpu's TSC rate. > > Signed-off-by: Haozhong ZhangReviewed-by: Eduardo Habkost > --- > target-i386/kvm.c | 14 ++ > 1 file changed, 14 insertions(+) > > diff --git a/target-i386/kvm.c b/target-i386/kvm.c > index 2a9953b..a0fe9d4 100644 > --- a/target-i386/kvm.c > +++ b/target-i386/kvm.c > @@ -832,6 +832,20 @@ int kvm_arch_init_vcpu(CPUState *cs) > } > } > > +/* vcpu's TSC frequency is either specified by user, or following > + * the value used by KVM if the former is not present. In the > + * latter case, we query it from KVM and record in env->tsc_khz, > + * so that vcpu's TSC frequency can be migrated later via this field. > + */ > +if (!env->tsc_khz) { > +r = kvm_check_extension(cs->kvm_state, KVM_CAP_GET_TSC_KHZ) ? > +kvm_vcpu_ioctl(cs, KVM_GET_TSC_KHZ) : > +-ENOTSUP; > +if (r > 0) { > +env->tsc_khz = r; > +} > +} > + > if (has_xsave) { > env->kvm_xsave_buf = qemu_memalign(4096, sizeof(struct kvm_xsave)); > } > -- > 2.4.8 > -- Eduardo -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [PATCH v6 1/3] target-i386: fallback vcpu's TSC rate to value returned by KVM
On Tue, Nov 24, 2015 at 11:33:55AM +0800, Haozhong Zhang wrote: > If no user-specified TSC rate is present, we will try to set > env->tsc_khz to the value returned by KVM_GET_TSC_KHZ. This patch does > not change the current functionality of QEMU and just prepares for later > patches to enable migrating vcpu's TSC rate. > > Signed-off-by: Haozhong ZhangReviewed-by: Eduardo Habkost > --- > target-i386/kvm.c | 14 ++ > 1 file changed, 14 insertions(+) > > diff --git a/target-i386/kvm.c b/target-i386/kvm.c > index 2a9953b..a0fe9d4 100644 > --- a/target-i386/kvm.c > +++ b/target-i386/kvm.c > @@ -832,6 +832,20 @@ int kvm_arch_init_vcpu(CPUState *cs) > } > } > > +/* vcpu's TSC frequency is either specified by user, or following > + * the value used by KVM if the former is not present. In the > + * latter case, we query it from KVM and record in env->tsc_khz, > + * so that vcpu's TSC frequency can be migrated later via this field. > + */ > +if (!env->tsc_khz) { > +r = kvm_check_extension(cs->kvm_state, KVM_CAP_GET_TSC_KHZ) ? > +kvm_vcpu_ioctl(cs, KVM_GET_TSC_KHZ) : > +-ENOTSUP; > +if (r > 0) { > +env->tsc_khz = r; > +} > +} > + > if (has_xsave) { > env->kvm_xsave_buf = qemu_memalign(4096, sizeof(struct kvm_xsave)); > } > -- > 2.4.8 > -- Eduardo -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html