[RFC PATCH kvmtool 4/5] ARM: Add a helper to re-init a vCPU

[Oliver Upton]

Create a helper that can be called to reinitialize a particular vCPU, or
in other words issue the KVM_ARM_VCPU_INIT and KVM_ARM_VCPU_FINALIZE
ioctls accordingly.

Make use of the helper from kvm_cpu__arch_init() after the correct
target/feature set have been identified. Calling KVM_ARM_VCPU_INIT with
the same target more than once is benign.

Signed-off-by: Oliver Upton <oupton at google.com>
---
 arm/kvm-cpu.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/arm/kvm-cpu.c b/arm/kvm-cpu.c
index 1ea56bb..164e399 100644
--- a/arm/kvm-cpu.c
+++ b/arm/kvm-cpu.c
@@ -35,6 +35,15 @@ int kvm_cpu__register_kvm_arm_target(struct kvm_arm_target *target)
 	return -ENOSPC;
 }
 
+static void kvm_cpu__arch_reinit(struct kvm_cpu *vcpu)
+{
+	if (ioctl(vcpu->vcpu_fd, KVM_ARM_VCPU_INIT, &vcpu->init) < 0)
+		die("KVM_ARM_VCPU_INIT failed");
+
+	if (kvm_cpu__configure_features(vcpu))
+		die("Unable to configure requested vcpu features");
+}
+
 struct kvm_cpu *kvm_cpu__arch_init(struct kvm *kvm, unsigned long cpu_id)
 {
 	struct kvm_arm_target *target;
@@ -132,8 +141,7 @@ struct kvm_cpu *kvm_cpu__arch_init(struct kvm *kvm, unsigned long cpu_id)
 	vcpu->cpu_compatible	= target->compatible;
 	vcpu->is_running	= true;
 
-	if (kvm_cpu__configure_features(vcpu))
-		die("Unable to configure requested vcpu features");
+	kvm_cpu__arch_reinit(vcpu);
 
 	return vcpu;
 }
-- 
2.35.1.723.g4982287a31-goog