From f41c8bdbbdbe73343d4842e580c6ab9db9d84171 Mon Sep 17 00:00:00 2001
From: Tianrui Zhao <zhaotianrui@loongson.cn>
Date: Mon, 2 Oct 2023 10:01:28 +0800
Subject: [PATCH] LoongArch: KVM: Implement handle idle exception
Implement kvm handle LoongArch vcpu idle exception, using kvm_vcpu_block
to emulate it.
Reviewed-by: Bibo Mao <maobibo@loongson.cn>
Tested-by: Huacai Chen <chenhuacai@loongson.cn>
Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
---
arch/loongarch/kvm/exit.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/arch/loongarch/kvm/exit.c b/arch/loongarch/kvm/exit.c
index 7e729dd9e915..d4d7e74f72af 100644
--- a/arch/loongarch/kvm/exit.c
+++ b/arch/loongarch/kvm/exit.c
@@ -194,3 +194,23 @@ int kvm_complete_iocsr_read(struct kvm_vcpu *vcpu, struct kvm_run *run)
return er;
}
+
+int kvm_emu_idle(struct kvm_vcpu *vcpu)
+{
+ ++vcpu->stat.idle_exits;
+ trace_kvm_exit_idle(vcpu, KVM_TRACE_EXIT_IDLE);
+
+ if (!kvm_arch_vcpu_runnable(vcpu)) {
+ /*
+ * Switch to the software timer before halt-polling/blocking as
+ * the guest's timer may be a break event for the vCPU, and the
+ * hypervisor timer runs only when the CPU is in guest mode.
+ * Switch before halt-polling so that KVM recognizes an expired
+ * timer before blocking.
+ */
+ kvm_save_timer(vcpu);
+ kvm_vcpu_block(vcpu);
+ }
+
+ return EMULATE_DONE;
+}
--
2.30.9