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From: Maran Wilson <maran.wilson@oracle.com>
To: Liran Alon <liran.alon@oracle.com>, qemu-devel@nongnu.org
Cc: ehabkost@redhat.com, kvm@vger.kernel.org, mtosatti@redhat.com,
	dgilbert@redhat.com, pbonzini@redhat.com, rth@twiddle.net,
	jmattson@google.com
Subject: Re: [Qemu-devel] [QEMU PATCH v3 9/9] KVM: i386: Remove VMX migration blocker
Date: Tue, 18 Jun 2019 15:17:00 -0700
Message-ID: <907faf19-aaff-1d1a-422e-739ee5aa7d12@oracle.com> (raw)
In-Reply-To: <20190617175658.135869-10-liran.alon@oracle.com>

On 6/17/2019 10:56 AM, Liran Alon wrote:
> This effectively reverts d98f26073beb ("target/i386: kvm: add VMX migration blocker").
> This can now be done because previous commits added support for Intel VMX migration.
>
> AMD SVM migration is still blocked. This is because kernel
> KVM_CAP_{GET,SET}_NESTED_STATE in case of AMD SVM is not
> implemented yet. Therefore, required vCPU nested state is still
> missing in order to perform valid migration for vCPU exposed with SVM.
>
> Signed-off-by: Liran Alon <liran.alon@oracle.com>
> ---
>   target/i386/kvm.c | 12 ++++++------
>   1 file changed, 6 insertions(+), 6 deletions(-)
>
> diff --git a/target/i386/kvm.c b/target/i386/kvm.c
> index 797f8ac46435..772c8619efc4 100644
> --- a/target/i386/kvm.c
> +++ b/target/i386/kvm.c
> @@ -948,7 +948,7 @@ static int hyperv_init_vcpu(X86CPU *cpu)
>   }
>   
>   static Error *invtsc_mig_blocker;
> -static Error *nested_virt_mig_blocker;
> +static Error *svm_mig_blocker;
>   
>   #define KVM_MAX_CPUID_ENTRIES  100
>   
> @@ -1313,13 +1313,13 @@ int kvm_arch_init_vcpu(CPUState *cs)
>                                     !!(c->ecx & CPUID_EXT_SMX);
>       }
>   
> -    if (cpu_has_nested_virt(env) && !nested_virt_mig_blocker) {
> -        error_setg(&nested_virt_mig_blocker,
> -                   "Nested virtualization does not support live migration yet");
> -        r = migrate_add_blocker(nested_virt_mig_blocker, &local_err);
> +    if (cpu_has_svm(env) && !svm_mig_blocker) {
> +        error_setg(&svm_mig_blocker,
> +                   "AMD SVM does not support live migration yet");
> +        r = migrate_add_blocker(svm_mig_blocker, &local_err);
>           if (local_err) {
>               error_report_err(local_err);
> -            error_free(nested_virt_mig_blocker);
> +            error_free(svm_mig_blocker);
>               return r;
>           }
>       }

Reviewed-by: Maran Wilson <maran.wilson@oracle.com>

Thanks,
-Maran

      reply index

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-17 17:56 [QEMU PATCH v3 0/9]: KVM: i386: Add support for save and restore of nested state Liran Alon
2019-06-17 17:56 ` [QEMU PATCH v3 1/9] KVM: Introduce kvm_arch_destroy_vcpu() Liran Alon
2019-06-18 22:15   ` [Qemu-devel] " Maran Wilson
2019-06-17 17:56 ` [QEMU PATCH v3 2/9] KVM: i386: Use symbolic constant for #DB/#BP exception constants Liran Alon
2019-06-17 17:56 ` [QEMU PATCH v3 3/9] KVM: i386: Re-inject #DB to guest with updated DR6 Liran Alon
2019-06-17 17:56 ` [QEMU PATCH v3 4/9] KVM: i386: Block migration for vCPUs exposed with nested virtualization Liran Alon
2019-06-18  8:44   ` Dr. David Alan Gilbert
2019-06-18 22:16   ` [Qemu-devel] " Maran Wilson
2019-06-17 17:56 ` [QEMU PATCH v3 5/9] linux-headers: i386: Modify struct kvm_nested_state to have explicit fields for data Liran Alon
2019-06-18 22:16   ` [Qemu-devel] " Maran Wilson
2019-06-17 17:56 ` [QEMU PATCH v3 6/9] vmstate: Add support for kernel integer types Liran Alon
2019-06-18  8:55   ` Dr. David Alan Gilbert
2019-06-18 15:36     ` Liran Alon
2019-06-18 15:42       ` Dr. David Alan Gilbert
2019-06-18 16:44         ` Paolo Bonzini
2019-06-17 17:56 ` [QEMU PATCH v3 7/9] KVM: i386: Add support for save and restore nested state Liran Alon
2019-06-18  9:03   ` Dr. David Alan Gilbert
2019-06-18 15:40     ` Liran Alon
2019-06-18 15:48       ` Dr. David Alan Gilbert
2019-06-18 15:50         ` Liran Alon
2019-06-18 16:16         ` Paolo Bonzini
2019-06-18 22:16   ` [Qemu-devel] " Maran Wilson
2019-06-17 17:56 ` [QEMU PATCH v3 8/9] KVM: i386: Add support for KVM_CAP_EXCEPTION_PAYLOAD Liran Alon
2019-06-18  9:07   ` Dr. David Alan Gilbert
2019-06-18 15:45     ` Liran Alon
2019-06-17 17:56 ` [QEMU PATCH v3 9/9] KVM: i386: Remove VMX migration blocker Liran Alon
2019-06-18 22:17   ` Maran Wilson [this message]

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