[PATCH v3 19/26] KVM: VMX: Fold fallback path into triggering posted IRQ helper

Sean Christopherson
2021-12-08T01:55:52Z

Move the fallback "wake_up" path into the helper to trigger posted
interrupt helper now that the nested and non-nested paths are identical.

No functional change intended.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
---
arch/x86/kvm/vmx/vmx.c | 18 ++++++++++--------
1 file changed, 10 insertions(+), 8 deletions(-)

diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index ff309ebe9f2c..9153f5f5d424 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -3889,7 +3889,7 @@ static void vmx_msr_filter_changed(struct kvm_vcpu *vcpu)
pt_update_intercept_for_msr(vcpu);
}

-static inline bool kvm_vcpu_trigger_posted_interrupt(struct kvm_vcpu *vcpu,
+static inline void kvm_vcpu_trigger_posted_interrupt(struct kvm_vcpu *vcpu,
int pi_vec)
{
#ifdef CONFIG_SMP
@@ -3920,10 +3920,15 @@ static inline bool kvm_vcpu_trigger_posted_interrupt(struct kvm_vcpu *vcpu,
*/

apic->send_IPI_mask(get_cpu_mask(vcpu->cpu), pi_vec);
- return true;
+ return;
}
#endif
- return false;
+ /*
+ * The vCPU isn't in the guest; wake the vCPU in case it is blocking,
+ * otherwise do nothing as KVM will grab the highest priority pending
+ * IRQ via ->sync_pir_to_irr() in vcpu_enter_guest().
+ */
+ kvm_vcpu_wake_up(vcpu);
}

static int vmx_deliver_nested_posted_interrupt(struct kvm_vcpu *vcpu,
@@ -3953,8 +3958,7 @@ static int vmx_deliver_nested_posted_interrupt(struct kvm_vcpu *vcpu,
smp_mb__after_atomic();

/* the PIR and ON have been set by L1. */
- if (!kvm_vcpu_trigger_posted_interrupt(vcpu, POSTED_INTR_NESTED_VECTOR))
- kvm_vcpu_wake_up(vcpu);
+ kvm_vcpu_trigger_posted_interrupt(vcpu, POSTED_INTR_NESTED_VECTOR);
return 0;
}
return -1;
@@ -3991,9 +3995,7 @@ static int vmx_deliver_posted_interrupt(struct kvm_vcpu *vcpu, int vector)
* guaranteed to see PID.ON=1 and sync the PIR to IRR if triggering a
* posted interrupt "fails" because vcpu->mode != IN_GUEST_MODE.
*/
- if (!kvm_vcpu_trigger_posted_interrupt(vcpu, POSTED_INTR_VECTOR))
- kvm_vcpu_wake_up(vcpu);
-
+ kvm_vcpu_trigger_posted_interrupt(vcpu, POSTED_INTR_VECTOR);
return 0;
}

--
2.34.1.400.ga245620fadb-goog