[PATCH v5 07/33] KVM: SVM: Don't put/load AVIC when setting virtual APIC mode

From: Sean Christopherson <seanjc@google.com>
To: Sean Christopherson <seanjc@google.com>,
	Paolo Bonzini <pbonzini@redhat.com>
Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
	Alejandro Jimenez <alejandro.j.jimenez@oracle.com>,
	Maxim Levitsky <mlevitsk@redhat.com>,
	Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>,
	Li RongQing <lirongqing@baidu.com>,
	Greg Edwards <gedwards@ddn.com>
Subject: [PATCH v5 07/33] KVM: SVM: Don't put/load AVIC when setting virtual APIC mode
Date: Fri,  6 Jan 2023 01:12:40 +0000	[thread overview]
Message-ID: <20230106011306.85230-8-seanjc@google.com> (raw)
In-Reply-To: <20230106011306.85230-1-seanjc@google.com>

Move the VMCB updates from avic_refresh_apicv_exec_ctrl() into
avic_set_virtual_apic_mode() and invert the dependency being said
functions to avoid calling avic_vcpu_{load,put}() and
avic_set_pi_irte_mode() when "only" setting the virtual APIC mode.

avic_set_virtual_apic_mode() is invoked from common x86 with preemption
enabled, which makes avic_vcpu_{load,put}() unhappy.  Luckily, calling
those and updating IRTE stuff is unnecessary as the only reason
avic_set_virtual_apic_mode() is called is to handle transitions between
xAPIC and x2APIC that don't also toggle APICv activation.  And if
activation doesn't change, there's no need to fiddle with the physical
APIC ID table or update IRTE.

The "full" refresh is guaranteed to be called if activation changes in
this case as the only call to the "set" path is:

	kvm_vcpu_update_apicv(vcpu);
	static_call_cond(kvm_x86_set_virtual_apic_mode)(vcpu);

and kvm_vcpu_update_apicv() invokes the refresh if activation changes:

	if (apic->apicv_active == activate)
		goto out;

	apic->apicv_active = activate;
	kvm_apic_update_apicv(vcpu);
	static_call(kvm_x86_refresh_apicv_exec_ctrl)(vcpu);

Rename the helper to reflect that it is also called during "refresh".

  WARNING: CPU: 183 PID: 49186 at arch/x86/kvm/svm/avic.c:1081 avic_vcpu_put+0xde/0xf0 [kvm_amd]
  CPU: 183 PID: 49186 Comm: stable Tainted: G           O       6.0.0-smp--fcddbca45f0a-sink #34
  Hardware name: Google, Inc. Arcadia_IT_80/Arcadia_IT_80, BIOS 10.48.0 01/27/2022
  RIP: 0010:avic_vcpu_put+0xde/0xf0 [kvm_amd]
   avic_refresh_apicv_exec_ctrl+0x142/0x1c0 [kvm_amd]
   avic_set_virtual_apic_mode+0x5a/0x70 [kvm_amd]
   kvm_lapic_set_base+0x149/0x1a0 [kvm]
   kvm_set_apic_base+0x8f/0xd0 [kvm]
   kvm_set_msr_common+0xa3a/0xdc0 [kvm]
   svm_set_msr+0x364/0x6b0 [kvm_amd]
   __kvm_set_msr+0xb8/0x1c0 [kvm]
   kvm_emulate_wrmsr+0x58/0x1d0 [kvm]
   msr_interception+0x1c/0x30 [kvm_amd]
   svm_invoke_exit_handler+0x31/0x100 [kvm_amd]
   svm_handle_exit+0xfc/0x160 [kvm_amd]
   vcpu_enter_guest+0x21bb/0x23e0 [kvm]
   vcpu_run+0x92/0x450 [kvm]
   kvm_arch_vcpu_ioctl_run+0x43e/0x6e0 [kvm]
   kvm_vcpu_ioctl+0x559/0x620 [kvm]

Fixes: 05c4fe8c1bd9 ("KVM: SVM: Refresh AVIC configuration when changing APIC mode")
Cc: stable@vger.kernel.org
Cc: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
---
 arch/x86/kvm/svm/avic.c | 31 +++++++++++++++----------------
 arch/x86/kvm/svm/svm.c  |  2 +-
 arch/x86/kvm/svm/svm.h  |  2 +-
 3 files changed, 17 insertions(+), 18 deletions(-)

diff --git a/arch/x86/kvm/svm/avic.c b/arch/x86/kvm/svm/avic.c
index 3b2c88b168ba..97ad0661f963 100644
--- a/arch/x86/kvm/svm/avic.c
+++ b/arch/x86/kvm/svm/avic.c
@@ -747,18 +747,6 @@ void avic_apicv_post_state_restore(struct kvm_vcpu *vcpu)
 	avic_handle_ldr_update(vcpu);
 }
 
-void avic_set_virtual_apic_mode(struct kvm_vcpu *vcpu)
-{
-	if (!lapic_in_kernel(vcpu) || avic_mode == AVIC_MODE_NONE)
-		return;
-
-	if (kvm_get_apic_mode(vcpu) == LAPIC_MODE_INVALID) {
-		WARN_ONCE(true, "Invalid local APIC state (vcpu_id=%d)", vcpu->vcpu_id);
-		return;
-	}
-	avic_refresh_apicv_exec_ctrl(vcpu);
-}
-
 static int avic_set_pi_irte_mode(struct kvm_vcpu *vcpu, bool activate)
 {
 	int ret = 0;
@@ -1100,17 +1088,18 @@ void avic_vcpu_put(struct kvm_vcpu *vcpu)
 	WRITE_ONCE(*(svm->avic_physical_id_cache), entry);
 }
 
-
-void avic_refresh_apicv_exec_ctrl(struct kvm_vcpu *vcpu)
+void avic_refresh_virtual_apic_mode(struct kvm_vcpu *vcpu)
 {
 	struct vcpu_svm *svm = to_svm(vcpu);
 	struct vmcb *vmcb = svm->vmcb01.ptr;
-	bool activated = kvm_vcpu_apicv_active(vcpu);
+
+	if (!lapic_in_kernel(vcpu) || avic_mode == AVIC_MODE_NONE)
+		return;
 
 	if (!enable_apicv)
 		return;
 
-	if (activated) {
+	if (kvm_vcpu_apicv_active(vcpu)) {
 		/**
 		 * During AVIC temporary deactivation, guest could update
 		 * APIC ID, DFR and LDR registers, which would not be trapped
@@ -1124,6 +1113,16 @@ void avic_refresh_apicv_exec_ctrl(struct kvm_vcpu *vcpu)
 		avic_deactivate_vmcb(svm);
 	}
 	vmcb_mark_dirty(vmcb, VMCB_AVIC);
+}
+
+void avic_refresh_apicv_exec_ctrl(struct kvm_vcpu *vcpu)
+{
+	bool activated = kvm_vcpu_apicv_active(vcpu);
+
+	if (!enable_apicv)
+		return;
+
+	avic_refresh_virtual_apic_mode(vcpu);
 
 	if (activated)
 		avic_vcpu_load(vcpu, vcpu->cpu);
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index 6ffadbd57744..26044e1d2422 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -4771,7 +4771,7 @@ static struct kvm_x86_ops svm_x86_ops __initdata = {
 	.enable_nmi_window = svm_enable_nmi_window,
 	.enable_irq_window = svm_enable_irq_window,
 	.update_cr8_intercept = svm_update_cr8_intercept,
-	.set_virtual_apic_mode = avic_set_virtual_apic_mode,
+	.set_virtual_apic_mode = avic_refresh_virtual_apic_mode,
 	.refresh_apicv_exec_ctrl = avic_refresh_apicv_exec_ctrl,
 	.check_apicv_inhibit_reasons = avic_check_apicv_inhibit_reasons,
 	.apicv_post_state_restore = avic_apicv_post_state_restore,
diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h
index 4826e6cc611b..d0ed3f595229 100644
--- a/arch/x86/kvm/svm/svm.h
+++ b/arch/x86/kvm/svm/svm.h
@@ -648,7 +648,7 @@ void avic_vcpu_blocking(struct kvm_vcpu *vcpu);
 void avic_vcpu_unblocking(struct kvm_vcpu *vcpu);
 void avic_ring_doorbell(struct kvm_vcpu *vcpu);
 unsigned long avic_vcpu_get_apicv_inhibit_reasons(struct kvm_vcpu *vcpu);
-void avic_set_virtual_apic_mode(struct kvm_vcpu *vcpu);
+void avic_refresh_virtual_apic_mode(struct kvm_vcpu *vcpu);
 
 
 /* sev.c */
-- 
2.39.0.314.g84b9a713c41-goog

