[RFC PATCH v6 48/92] kvm: add kvm_vcpu_kick_and_wait()
From: Adalbert Lazăr <hidden>
Date: 2019-08-09 16:03:22
Also in:
kvm, linux-mm
Subsystem:
kernel virtual machine (kvm), the rest · Maintainers:
Paolo Bonzini, Linus Torvalds
This function is needed for the KVMI_PAUSE_VCPU command. There are cases when it is easier for the introspection tool if it knows that the vCPU doesn't run guest code when the command is completed, without waiting for the KVMI_EVENT_PAUSE_VCPU event. Signed-off-by: Adalbert Lazăr <redacted> --- include/linux/kvm_host.h | 1 + virt/kvm/kvm_main.c | 10 ++++++++++ 2 files changed, 11 insertions(+)
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index ae4106aae16e..09bc06747642 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h@@ -738,6 +738,7 @@ void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu); void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu); bool kvm_vcpu_wake_up(struct kvm_vcpu *vcpu); void kvm_vcpu_kick(struct kvm_vcpu *vcpu); +void kvm_vcpu_kick_and_wait(struct kvm_vcpu *vcpu); int kvm_vcpu_yield_to(struct kvm_vcpu *target); void kvm_vcpu_on_spin(struct kvm_vcpu *vcpu, bool usermode_vcpu_not_eligible);
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 2e11069b9565..5256d7321d0e 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c@@ -2370,6 +2370,16 @@ void kvm_vcpu_kick(struct kvm_vcpu *vcpu) EXPORT_SYMBOL_GPL(kvm_vcpu_kick); #endif /* !CONFIG_S390 */ +void kvm_vcpu_kick_and_wait(struct kvm_vcpu *vcpu) +{ + if (kvm_vcpu_wake_up(vcpu)) + return; + + if (kvm_request_needs_ipi(vcpu, KVM_REQUEST_WAIT)) + smp_call_function_single(vcpu->cpu, ack_flush, NULL, 1); +} +EXPORT_SYMBOL_GPL(kvm_vcpu_kick_and_wait); + int kvm_vcpu_yield_to(struct kvm_vcpu *target) { struct pid *pid;
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