[PATCH v5 6/6] LoongArch: KVM: Deliver interrupt after IN_GUEST_MODE is set
From: Bibo Mao
Date: Tue May 26 2026 - 08:56:16 EST
Interrupt delivery should be called after IN_GUEST_MODE is set. Other
threads may be posting interrupt however does not send IPI to the
vCPU, since the vCPU is not in IN_GUEST_MODE.
here move function call with kvm_deliver_intr() after IN_GUEST_MODE
is set, and set mode with OUTSIDE_GUEST_MODE with atomic method.
Signed-off-by: Bibo Mao <maobibo@xxxxxxxxxxx>
---
arch/loongarch/kvm/vcpu.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/loongarch/kvm/vcpu.c b/arch/loongarch/kvm/vcpu.c
index 3c6726e00531..f8ce985dc97b 100644
--- a/arch/loongarch/kvm/vcpu.c
+++ b/arch/loongarch/kvm/vcpu.c
@@ -308,10 +308,10 @@ static int kvm_pre_enter_guest(struct kvm_vcpu *vcpu)
* check vmid before vcpu enter guest
*/
local_irq_disable();
- kvm_deliver_intr(vcpu);
kvm_deliver_exception(vcpu);
/* Make sure the vcpu mode has been written */
smp_store_mb(vcpu->mode, IN_GUEST_MODE);
+ kvm_deliver_intr(vcpu);
kvm_check_vpid(vcpu);
/*
@@ -348,7 +348,7 @@ static int kvm_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu)
u32 intr = estat & CSR_ESTAT_IS;
u32 ecode = (estat & CSR_ESTAT_EXC) >> CSR_ESTAT_EXC_SHIFT;
- vcpu->mode = OUTSIDE_GUEST_MODE;
+ smp_store_mb(vcpu->mode, OUTSIDE_GUEST_MODE);
/* Set a default exit reason */
run->exit_reason = KVM_EXIT_UNKNOWN;
--
2.39.3