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KVM: Add a comment explaining the directed yield pending interrupt logic
author
Sean Christopherson
<seanjc@google.com>
Wed, 10 Jan 2024 00:39:38 +0000
(16:39 -0800)
committer
Sean Christopherson
<seanjc@google.com>
Fri, 23 Feb 2024 00:27:41 +0000
(16:27 -0800)
Add a comment to explain why KVM treats vCPUs with pending interrupts as
in-kernel when a vCPU wants to yield to a vCPU that was preempted while
running in kernel mode.
Link:
https://lore.kernel.org/r/20240110003938.490206-5-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
virt/kvm/kvm_main.c
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diff --git
a/virt/kvm/kvm_main.c
b/virt/kvm/kvm_main.c
index 9b92858c8b72acfac046b4fe86193042be32c971..c0c2fcdabe1b3b0a369e3e1f9e675c32c9bdf592 100644
(file)
--- a/
virt/kvm/kvm_main.c
+++ b/
virt/kvm/kvm_main.c
@@
-4090,6
+4090,13
@@
void kvm_vcpu_on_spin(struct kvm_vcpu *me, bool yield_to_kernel_mode)
continue;
if (kvm_vcpu_is_blocking(vcpu) && !vcpu_dy_runnable(vcpu))
continue;
+
+ /*
+ * Treat the target vCPU as being in-kernel if it has a
+ * pending interrupt, as the vCPU trying to yield may
+ * be spinning waiting on IPI delivery, i.e. the target
+ * vCPU is in-kernel for the purposes of directed yield.
+ */
if (READ_ONCE(vcpu->preempted) && yield_to_kernel_mode &&
!kvm_arch_dy_has_pending_interrupt(vcpu) &&
!kvm_arch_vcpu_preempted_in_kernel(vcpu))