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Subject[PATCH 3/3] KVM: implement spinlock optimization logic for arm/s390
Date
Implements the kvm_arch_vcpu_spin/preempt_in_kernel() for arm/s390,
they needn't cache the result.

Signed-off-by: Longpeng(Mike) <longpeng2@huawei.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

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