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From: Marcelo Tosatti <mtosatti@redhat.com>
To: kvm@vger.kernel.org
Cc: Paolo Bonzini <pbonzini@redhat.com>,
	Alex Williamson <alex.williamson@redhat.com>,
	Sean Christopherson <seanjc@google.com>,
	Marcelo Tosatti <mtosatti@redhat.com>
Subject: [patch 1/2] KVM: x86: add start_assignment hook to kvm_x86_ops
Date: Thu, 06 May 2021 15:57:33 -0300	[thread overview]
Message-ID: <20210506190419.451446263@redhat.com> (raw)
In-Reply-To: <20210506185732.609010123@redhat.com>

Add a start_assignment hook to kvm_x86_ops, which is called when 
kvm_arch_start_assignment is done.

The hook is required to update the wakeup vector of a sleeping vCPU
when a device is assigned to the guest.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

Index: kvm/arch/x86/include/asm/kvm_host.h
===================================================================
--- kvm.orig/arch/x86/include/asm/kvm_host.h
+++ kvm/arch/x86/include/asm/kvm_host.h
@@ -1322,6 +1322,7 @@ struct kvm_x86_ops {
 
 	int (*update_pi_irte)(struct kvm *kvm, unsigned int host_irq,
 			      uint32_t guest_irq, bool set);
+	void (*start_assignment)(struct kvm *kvm, int device_count);
 	void (*apicv_post_state_restore)(struct kvm_vcpu *vcpu);
 	bool (*dy_apicv_has_pending_interrupt)(struct kvm_vcpu *vcpu);
 
Index: kvm/arch/x86/kvm/svm/svm.c
===================================================================
--- kvm.orig/arch/x86/kvm/svm/svm.c
+++ kvm/arch/x86/kvm/svm/svm.c
@@ -4601,6 +4601,7 @@ static struct kvm_x86_ops svm_x86_ops __
 	.deliver_posted_interrupt = svm_deliver_avic_intr,
 	.dy_apicv_has_pending_interrupt = svm_dy_apicv_has_pending_interrupt,
 	.update_pi_irte = svm_update_pi_irte,
+	.start_assignment = NULL,
 	.setup_mce = svm_setup_mce,
 
 	.smi_allowed = svm_smi_allowed,
Index: kvm/arch/x86/kvm/vmx/vmx.c
===================================================================
--- kvm.orig/arch/x86/kvm/vmx/vmx.c
+++ kvm/arch/x86/kvm/vmx/vmx.c
@@ -7732,6 +7732,7 @@ static struct kvm_x86_ops vmx_x86_ops __
 	.nested_ops = &vmx_nested_ops,
 
 	.update_pi_irte = pi_update_irte,
+	.start_assignment = NULL,
 
 #ifdef CONFIG_X86_64
 	.set_hv_timer = vmx_set_hv_timer,
Index: kvm/arch/x86/kvm/x86.c
===================================================================
--- kvm.orig/arch/x86/kvm/x86.c
+++ kvm/arch/x86/kvm/x86.c
@@ -11295,7 +11295,11 @@ bool kvm_arch_can_dequeue_async_page_pre
 
 void kvm_arch_start_assignment(struct kvm *kvm)
 {
-	atomic_inc(&kvm->arch.assigned_device_count);
+	int ret;
+
+	ret = atomic_inc_return(&kvm->arch.assigned_device_count);
+	if (kvm_x86_ops.start_assignment)
+		kvm_x86_ops.start_assignment(kvm, ret);
 }
 EXPORT_SYMBOL_GPL(kvm_arch_start_assignment);
 



  reply	other threads:[~2021-05-06 19:07 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-06 18:57 [patch 0/2] VMX: configure posted interrupt descriptor when assigning device Marcelo Tosatti
2021-05-06 18:57 ` Marcelo Tosatti [this message]
2021-05-06 19:54   ` [patch 1/2] KVM: x86: add start_assignment hook to kvm_x86_ops Sean Christopherson
2021-05-06 18:57 ` [patch 2/2] KVM: VMX: update vcpu posted-interrupt descriptor when assigning device Marcelo Tosatti
2021-05-06 19:11   ` Marcelo Tosatti
2021-05-06 19:21   ` [patch 2/2 V2] " Marcelo Tosatti
2021-05-06 21:35     ` Sean Christopherson
2021-05-07 12:11       ` Marcelo Tosatti

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