From: Bibo Mao <maobibo@loongson.cn>
To: Tianrui Zhao <zhaotianrui@loongson.cn>,
Huacai Chen <chenhuacai@kernel.org>
Cc: kernel@xen0n.name, kvm@vger.kernel.org,
loongarch@lists.linux.dev, linux-kernel@vger.kernel.org,
Juergen Gross <jgross@suse.com>
Subject: [PATCH v3 1/4] LoongArch: KVM: Add kvm_request_pending checking in kvm_late_check_requests()
Date: Mon, 23 Mar 2026 10:56:10 +0800 [thread overview]
Message-ID: <20260323025613.3260876-2-maobibo@loongson.cn> (raw)
In-Reply-To: <20260323025613.3260876-1-maobibo@loongson.cn>
Add kvm_request_pending() checking firstly in kvm_late_check_requests(),
at most time there is no pending request, the following pending bit
checking can be skipped then.
Also move function kvm_check_pmu() in kvm_late_check_requests(), and put
it after kvm_request_pending() checking.
Signed-off-by: Bibo Mao <maobibo@loongson.cn>
---
arch/loongarch/kvm/vcpu.c | 17 ++++++++---------
1 file changed, 8 insertions(+), 9 deletions(-)
diff --git a/arch/loongarch/kvm/vcpu.c b/arch/loongarch/kvm/vcpu.c
index 8ffd50a470e6..028eb3d5a33b 100644
--- a/arch/loongarch/kvm/vcpu.c
+++ b/arch/loongarch/kvm/vcpu.c
@@ -149,14 +149,6 @@ static void kvm_lose_pmu(struct kvm_vcpu *vcpu)
kvm_restore_host_pmu(vcpu);
}
-static void kvm_check_pmu(struct kvm_vcpu *vcpu)
-{
- if (kvm_check_request(KVM_REQ_PMU, vcpu)) {
- kvm_own_pmu(vcpu);
- vcpu->arch.aux_inuse |= KVM_LARCH_PMU;
- }
-}
-
static void kvm_update_stolen_time(struct kvm_vcpu *vcpu)
{
u32 version;
@@ -232,6 +224,14 @@ static int kvm_check_requests(struct kvm_vcpu *vcpu)
static void kvm_late_check_requests(struct kvm_vcpu *vcpu)
{
lockdep_assert_irqs_disabled();
+ if (!kvm_request_pending(vcpu))
+ return;
+
+ if (kvm_check_request(KVM_REQ_PMU, vcpu)) {
+ kvm_own_pmu(vcpu);
+ vcpu->arch.aux_inuse |= KVM_LARCH_PMU;
+ }
+
if (kvm_check_request(KVM_REQ_TLB_FLUSH_GPA, vcpu))
if (vcpu->arch.flush_gpa != INVALID_GPA) {
kvm_flush_tlb_gpa(vcpu, vcpu->arch.flush_gpa);
@@ -312,7 +312,6 @@ static int kvm_pre_enter_guest(struct kvm_vcpu *vcpu)
/* Make sure the vcpu mode has been written */
smp_store_mb(vcpu->mode, IN_GUEST_MODE);
kvm_check_vpid(vcpu);
- kvm_check_pmu(vcpu);
/*
* Called after function kvm_check_vpid()
--
2.39.3
next prev parent reply other threads:[~2026-03-23 2:56 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-23 2:56 [PATCH v3 0/4] LoongArch: KVM: Some small enhanments Bibo Mao
2026-03-23 2:56 ` Bibo Mao [this message]
2026-03-23 2:56 ` [PATCH v3 2/4] LoongArch: KVM: Move host CSR_EENTRY save and restore in context switch Bibo Mao
2026-03-23 2:56 ` [PATCH v3 3/4] LoongArch: KVM: Move host CSR_GSTAT " Bibo Mao
2026-03-23 2:56 ` [PATCH v3 4/4] LoongArch: KVM: Set vcpu_is_preempted() with macro rather than function Bibo Mao
2026-04-08 10:29 ` [PATCH v3 0/4] LoongArch: KVM: Some small enhanments Huacai Chen
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