linux-kernel - [PATCH 3/3] KVM: implement spinlock optimization logic for arm/s390

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Date:   Mon, 7 Aug 2017 16:44:26 +0800
From:   "Longpeng(Mike)" <longpeng2@...wei.com>
To:     <pbonzini@...hat.com>, <rkrcmar@...hat.com>
CC:     <agraf@...e.com>, <borntraeger@...ibm.com>, <cohuck@...hat.com>,
        <christoffer.dall@...aro.org>, <marc.zyngier@....com>,
        <james.hogan@...tec.com>, <kvm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <weidong.huang@...wei.com>,
        <arei.gonglei@...wei.com>, <wangxinxin.wang@...wei.com>,
        <longpeng.mike@...il.com>, <david@...hat.com>,
        "Longpeng(Mike)" <longpeng2@...wei.com>
Subject: [PATCH 3/3] KVM: implement spinlock optimization logic for arm/s390

Implements the kvm_arch_vcpu_spin/preempt_in_kernel() for arm/s390,
they needn't cache the result.

Signed-off-by: Longpeng(Mike) <longpeng2@...wei.com>
---
 arch/s390/kvm/kvm-s390.c | 4 ++--
 virt/kvm/arm/arm.c       | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index f78cdc2..49b9178 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -2449,12 +2449,12 @@ int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
 
 bool kvm_arch_vcpu_spin_in_kernel(struct kvm_vcpu *vcpu)
 {
-	return false;
+	return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE);
 }
 
 bool kvm_arch_vcpu_preempt_in_kernel(struct kvm_vcpu *vcpu)
 {
-	return false;
+	return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE);
 }
 
 void kvm_s390_vcpu_block(struct kvm_vcpu *vcpu)
diff --git a/virt/kvm/arm/arm.c b/virt/kvm/arm/arm.c
index e45f780..956f025 100644
--- a/virt/kvm/arm/arm.c
+++ b/virt/kvm/arm/arm.c
@@ -418,12 +418,12 @@ int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
 
 bool kvm_arch_vcpu_spin_in_kernel(struct kvm_vcpu *vcpu)
 {
-	return false;
+	return vcpu_mode_priv(vcpu);
 }
 
 bool kvm_arch_vcpu_preempt_in_kernel(struct kvm_vcpu *vcpu)
 {
-	return false;
+	return vcpu_mode_priv(vcpu);
 }
 
 /* Just ensure a guest exit from a particular CPU */
-- 
1.8.3.1