linux-kernel - Re: [PATCH 1/4] KVM: TDX: Move apicv_pre_state_restore to posted

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Message-ID: <24ada86a-131f-4624-8333-baa37e2a4a67@linux.intel.com>
Date: Fri, 14 Mar 2025 10:36:43 +0800
From: Binbin Wu <binbin.wu@...ux.intel.com>
To: Vishal Verma <vishal.l.verma@...el.com>,
 Sean Christopherson <seanjc@...gle.com>, Paolo Bonzini <pbonzini@...hat.com>
Cc: kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
 Rick Edgecombe <rick.p.edgecombe@...el.com>
Subject: Re: [PATCH 1/4] KVM: TDX: Move apicv_pre_state_restore to
 posted_intr.c



On 3/14/2025 3:30 AM, Vishal Verma wrote:
> In preparation for a cleanup of the x86_ops struct for TDX, which turns
> several of the ops definitions to macros, move the
> vt_apicv_pre_state_restore() helper into posted_intr.c.
>
> Based on a patch by Sean Christopherson <seanjc@...gle.com>
>
> Link: https://lore.kernel.org/kvm/Z6v9yjWLNTU6X90d@google.com/
> Cc: Sean Christopherson <seanjc@...gle.com>
> Cc: Rick Edgecombe <rick.p.edgecombe@...el.com>
> Signed-off-by: Vishal Verma <vishal.l.verma@...el.com>

Reviewed-by: Binbin Wu <binbin.wu@...xu.intel.com>

> ---
>   arch/x86/kvm/vmx/posted_intr.h |  1 +
>   arch/x86/kvm/vmx/main.c        | 10 +---------
>   arch/x86/kvm/vmx/posted_intr.c |  8 ++++++++
>   3 files changed, 10 insertions(+), 9 deletions(-)
>
> diff --git a/arch/x86/kvm/vmx/posted_intr.h b/arch/x86/kvm/vmx/posted_intr.h
> index 68605ca7ef68..9d0677a2ba0e 100644
> --- a/arch/x86/kvm/vmx/posted_intr.h
> +++ b/arch/x86/kvm/vmx/posted_intr.h
> @@ -11,6 +11,7 @@ void vmx_vcpu_pi_load(struct kvm_vcpu *vcpu, int cpu);
>   void vmx_vcpu_pi_put(struct kvm_vcpu *vcpu);
>   void pi_wakeup_handler(void);
>   void __init pi_init_cpu(int cpu);
> +void pi_apicv_pre_state_restore(struct kvm_vcpu *vcpu);
>   bool pi_has_pending_interrupt(struct kvm_vcpu *vcpu);
>   int vmx_pi_update_irte(struct kvm *kvm, unsigned int host_irq,
>   		       uint32_t guest_irq, bool set);
> diff --git a/arch/x86/kvm/vmx/main.c b/arch/x86/kvm/vmx/main.c
> index 320c96e1e80a..9d201ddb794a 100644
> --- a/arch/x86/kvm/vmx/main.c
> +++ b/arch/x86/kvm/vmx/main.c
> @@ -315,14 +315,6 @@ static void vt_set_virtual_apic_mode(struct kvm_vcpu *vcpu)
>   	return vmx_set_virtual_apic_mode(vcpu);
>   }
>   
> -static void vt_apicv_pre_state_restore(struct kvm_vcpu *vcpu)
> -{
> -	struct pi_desc *pi = vcpu_to_pi_desc(vcpu);
> -
> -	pi_clear_on(pi);
> -	memset(pi->pir, 0, sizeof(pi->pir));
> -}
> -
>   static void vt_hwapic_isr_update(struct kvm_vcpu *vcpu, int max_isr)
>   {
>   	if (is_td_vcpu(vcpu))
> @@ -983,7 +975,7 @@ struct kvm_x86_ops vt_x86_ops __initdata = {
>   	.set_apic_access_page_addr = vt_set_apic_access_page_addr,
>   	.refresh_apicv_exec_ctrl = vt_refresh_apicv_exec_ctrl,
>   	.load_eoi_exitmap = vt_load_eoi_exitmap,
> -	.apicv_pre_state_restore = vt_apicv_pre_state_restore,
> +	.apicv_pre_state_restore = pi_apicv_pre_state_restore,
>   	.required_apicv_inhibits = VMX_REQUIRED_APICV_INHIBITS,
>   	.hwapic_isr_update = vt_hwapic_isr_update,
>   	.sync_pir_to_irr = vt_sync_pir_to_irr,
> diff --git a/arch/x86/kvm/vmx/posted_intr.c b/arch/x86/kvm/vmx/posted_intr.c
> index f2ca37b3f606..a140af060bb8 100644
> --- a/arch/x86/kvm/vmx/posted_intr.c
> +++ b/arch/x86/kvm/vmx/posted_intr.c
> @@ -241,6 +241,14 @@ void __init pi_init_cpu(int cpu)
>   	raw_spin_lock_init(&per_cpu(wakeup_vcpus_on_cpu_lock, cpu));
>   }
>   
> +void pi_apicv_pre_state_restore(struct kvm_vcpu *vcpu)
> +{
> +	struct pi_desc *pi = vcpu_to_pi_desc(vcpu);
> +
> +	pi_clear_on(pi);
> +	memset(pi->pir, 0, sizeof(pi->pir));
> +}
> +
>   bool pi_has_pending_interrupt(struct kvm_vcpu *vcpu)
>   {
>   	struct pi_desc *pi_desc = vcpu_to_pi_desc(vcpu);
>