[PATCH V11 17/17] RISC-V: paravirt: pvqspinlock: KVM: Implement kvm_sbi_ext_pvlock_kick_cpu()

[guoren at kernel.org]

From: Guo Ren <guoren at linux.alibaba.com>

We only need to call the kvm_vcpu_kick() and bring target_vcpu
from the halt state. No irq raised, no other request, just a pure
vcpu_kick.

Signed-off-by: Guo Ren <guoren at linux.alibaba.com>
Signed-off-by: Guo Ren <guoren at kernel.org>
---
 arch/riscv/kvm/vcpu_sbi_pvlock.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/arch/riscv/kvm/vcpu_sbi_pvlock.c b/arch/riscv/kvm/vcpu_sbi_pvlock.c
index 544a456c5041..914fc58aedfe 100644
--- a/arch/riscv/kvm/vcpu_sbi_pvlock.c
+++ b/arch/riscv/kvm/vcpu_sbi_pvlock.c
@@ -12,6 +12,24 @@
 #include <asm/sbi.h>
 #include <asm/kvm_vcpu_sbi.h>
 
+static int kvm_sbi_ext_pvlock_kick_cpu(struct kvm_vcpu *vcpu)
+{
+	struct kvm_cpu_context *cp = &vcpu->arch.guest_context;
+	struct kvm *kvm = vcpu->kvm;
+	struct kvm_vcpu *target;
+
+	target = kvm_get_vcpu_by_id(kvm, cp->a0);
+	if (!target)
+		return SBI_ERR_INVALID_PARAM;
+
+	kvm_vcpu_kick(target);
+
+	if (READ_ONCE(target->ready))
+		kvm_vcpu_yield_to(target);
+
+	return SBI_SUCCESS;
+}
+
 static int kvm_sbi_ext_pvlock_handler(struct kvm_vcpu *vcpu, struct kvm_run *run,
 				      struct kvm_vcpu_sbi_return *retdata)
 {
@@ -21,6 +39,7 @@ static int kvm_sbi_ext_pvlock_handler(struct kvm_vcpu *vcpu, struct kvm_run *run
 
 	switch (funcid) {
 	case SBI_EXT_PVLOCK_KICK_CPU:
+		ret = kvm_sbi_ext_pvlock_kick_cpu(vcpu);
 		break;
 	default:
 		ret = SBI_ERR_NOT_SUPPORTED;
-- 
2.36.1