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Date: Tue, 1 Feb 2022 18:02:42 +0700
From: "Suthikulpanit, Suravee" <suravee.suthikulpanit@....com>
To: Sean Christopherson <seanjc@...gle.com>
Cc: linux-kernel@...r.kernel.org, kvm@...r.kernel.org, x86@...nel.org,
pbonzini@...hat.com, joro@...tes.org, mlevitsk@...hat.com,
tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
peterz@...radead.org, hpa@...or.com, thomas.lendacky@....com,
jon.grimm@....com
Subject: Re: [PATCH v3 1/3] KVM: SVM: Refactor AVIC hardware setup logic into
helper function
Hi Sean,
Thanks for the suggestion. I'll update this in v4.
Regards,
Suravee
On 12/31/2021 12:26 AM, Sean Christopherson wrote:
> On Mon, Dec 13, 2021, Suravee Suthikulpanit wrote:
>> To prepare for upcoming AVIC changes. There is no functional change.
>>
>> Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@....com>
>> ---
>> arch/x86/kvm/svm/avic.c | 10 ++++++++++
>> arch/x86/kvm/svm/svm.c | 8 +-------
>> arch/x86/kvm/svm/svm.h | 1 +
>> 3 files changed, 12 insertions(+), 7 deletions(-)
>>
>> diff --git a/arch/x86/kvm/svm/avic.c b/arch/x86/kvm/svm/avic.c
>> index 8052d92069e0..63c3801d1829 100644
>> --- a/arch/x86/kvm/svm/avic.c
>> +++ b/arch/x86/kvm/svm/avic.c
>> @@ -1011,3 +1011,13 @@ void svm_vcpu_unblocking(struct kvm_vcpu *vcpu)
>> kvm_vcpu_update_apicv(vcpu);
>> avic_set_running(vcpu, true);
>> }
>> +
>> +bool avic_hardware_setup(bool avic)
>> +{
>> + if (!avic || !npt_enabled || !boot_cpu_has(X86_FEATURE_AVIC))
>> + return false;
>> +
>> + pr_info("AVIC enabled\n");
>> + amd_iommu_register_ga_log_notifier(&avic_ga_log_notifier);
>> + return true;
>> +}
>> diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
>> index 989685098b3e..e59f663ab8cb 100644
>> --- a/arch/x86/kvm/svm/svm.c
>> +++ b/arch/x86/kvm/svm/svm.c
>> @@ -1031,13 +1031,7 @@ static __init int svm_hardware_setup(void)
>> nrips = false;
>> }
>>
>> - enable_apicv = avic = avic && npt_enabled && boot_cpu_has(X86_FEATURE_AVIC);
>> -
>> - if (enable_apicv) {
>> - pr_info("AVIC enabled\n");
>> -
>> - amd_iommu_register_ga_log_notifier(&avic_ga_log_notifier);
>> - }
>> + enable_apicv = avic = avic_hardware_setup(avic);
>
> Rather than pass in "avic", just do
>
> enable_apicv = avic == avic && avic_hardware_setup();
>
> This also conflicts with changes sitting in kvm/queue to nullify vcpu_(un)blocking
> when AVIC is disabled. But moving AVIC setup to avic.c provides an opportunity for
> further cleanup, as it means vcpu_(un)blocking can be NULL by default and set to
> the AVIC helpers if and only if AVIC is enable. That will allow making the helpers
> static in avic.c. E.g.
>
> ---
> arch/x86/kvm/svm/avic.c | 17 +++++++++++++++--
> arch/x86/kvm/svm/svm.c | 13 +------------
> arch/x86/kvm/svm/svm.h | 3 +--
> 3 files changed, 17 insertions(+), 16 deletions(-)
>
> diff --git a/arch/x86/kvm/svm/avic.c b/arch/x86/kvm/svm/avic.c
> index 90364d02f22a..f5c6cab42d74 100644
> --- a/arch/x86/kvm/svm/avic.c
> +++ b/arch/x86/kvm/svm/avic.c
> @@ -1027,7 +1027,7 @@ void avic_vcpu_put(struct kvm_vcpu *vcpu)
> WRITE_ONCE(*(svm->avic_physical_id_cache), entry);
> }
>
> -void avic_vcpu_blocking(struct kvm_vcpu *vcpu)
> +static void avic_vcpu_blocking(struct kvm_vcpu *vcpu)
> {
> if (!kvm_vcpu_apicv_active(vcpu))
> return;
> @@ -1052,7 +1052,7 @@ void avic_vcpu_blocking(struct kvm_vcpu *vcpu)
> preempt_enable();
> }
>
> -void avic_vcpu_unblocking(struct kvm_vcpu *vcpu)
> +static void avic_vcpu_unblocking(struct kvm_vcpu *vcpu)
> {
> int cpu;
>
> @@ -1066,3 +1066,16 @@ void avic_vcpu_unblocking(struct kvm_vcpu *vcpu)
>
> put_cpu();
> }
> +
> +bool avic_hardware_setup(struct kvm_x86_ops *x86_ops)
> +{
> + if (!npt_enabled || !boot_cpu_has(X86_FEATURE_AVIC))
> + return false;
> +
> + x86_ops->vcpu_blocking = avic_vcpu_blocking,
> + x86_ops->vcpu_unblocking = avic_vcpu_unblocking,
> +
> + pr_info("AVIC enabled\n");
> + amd_iommu_register_ga_log_notifier(&avic_ga_log_notifier);
> + return true;
> +}
> diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
> index 6cb38044a860..6cb0f58238cd 100644
> --- a/arch/x86/kvm/svm/svm.c
> +++ b/arch/x86/kvm/svm/svm.c
> @@ -4390,8 +4390,6 @@ static struct kvm_x86_ops svm_x86_ops __initdata = {
> .prepare_guest_switch = svm_prepare_guest_switch,
> .vcpu_load = svm_vcpu_load,
> .vcpu_put = svm_vcpu_put,
> - .vcpu_blocking = avic_vcpu_blocking,
> - .vcpu_unblocking = avic_vcpu_unblocking,
>
> .update_exception_bitmap = svm_update_exception_bitmap,
> .get_msr_feature = svm_get_msr_feature,
> @@ -4674,16 +4672,7 @@ static __init int svm_hardware_setup(void)
> nrips = false;
> }
>
> - enable_apicv = avic = avic && npt_enabled && boot_cpu_has(X86_FEATURE_AVIC);
> -
> - if (enable_apicv) {
> - pr_info("AVIC enabled\n");
> -
> - amd_iommu_register_ga_log_notifier(&avic_ga_log_notifier);
> - } else {
> - svm_x86_ops.vcpu_blocking = NULL;
> - svm_x86_ops.vcpu_unblocking = NULL;
> - }
> + enable_apicv = avic = avic && avic_hardware_setup(&svm_x86_ops);
>
> if (vls) {
> if (!npt_enabled ||
> diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h
> index daa8ca84afcc..59d91b969bd7 100644
> --- a/arch/x86/kvm/svm/svm.h
> +++ b/arch/x86/kvm/svm/svm.h
> @@ -573,6 +573,7 @@ extern struct kvm_x86_nested_ops svm_nested_ops;
>
> #define VMCB_AVIC_APIC_BAR_MASK 0xFFFFFFFFFF000ULL
>
> +bool avic_hardware_setup(struct kvm_x86_ops *ops);
> int avic_ga_log_notifier(u32 ga_tag);
> void avic_vm_destroy(struct kvm *kvm);
> int avic_vm_init(struct kvm *kvm);
> @@ -593,8 +594,6 @@ int svm_deliver_avic_intr(struct kvm_vcpu *vcpu, int vec);
> bool svm_dy_apicv_has_pending_interrupt(struct kvm_vcpu *vcpu);
> int svm_update_pi_irte(struct kvm *kvm, unsigned int host_irq,
> uint32_t guest_irq, bool set);
> -void avic_vcpu_blocking(struct kvm_vcpu *vcpu);
> -void avic_vcpu_unblocking(struct kvm_vcpu *vcpu);
>
> /* sev.c */
>
> --
>
>
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