Re: [PATCH v6 1/3] target-i386: fallback vcpu's TSC rate to value returned by KVM

[Eduardo Habkost]

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 Zhang 

Reviewed-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
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Re: [PATCH v6 1/3] target-i386: fallback vcpu's TSC rate to value returned by KVM

[Eduardo Habkost]

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 Zhang 

Reviewed-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
> 

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Eduardo
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[PATCH v6 1/3] target-i386: fallback vcpu's TSC rate to value returned by KVM

[Haozhong Zhang]

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 Zhang 
---
 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

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