diff mbox series

[29/35] KVM: s390: protvirt: Report CPU state to Ultravisor

Message ID 20200207113958.7320-30-borntraeger@de.ibm.com (mailing list archive)
State New, archived
Headers show
Series KVM: s390: Add support for protected VMs | expand

Commit Message

Christian Borntraeger Feb. 7, 2020, 11:39 a.m. UTC 
From: Janosch Frank <frankja@linux.ibm.com>

VCPU states have to be reported to the ultravisor for SIGP
interpretation.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
[borntraeger@de.ibm.com: patch merging, splitting, fixing]
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
---
 arch/s390/kvm/kvm-s390.c |  5 ++++-
 arch/s390/kvm/pv.c       | 19 +++++++++++++++++++
 2 files changed, 23 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 0be18ac1afb5..ee98799212d3 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -4437,7 +4437,8 @@  void kvm_s390_vcpu_start(struct kvm_vcpu *vcpu)
 		 */
 		__disable_ibs_on_all_vcpus(vcpu->kvm);
 	}
-
+	/* Let's tell the UV that we want to start again */
+	kvm_s390_pv_set_cpu_state(vcpu, PV_CPU_STATE_OPR);
 	kvm_s390_clear_cpuflags(vcpu, CPUSTAT_STOPPED);
 	/*
 	 * Another VCPU might have used IBS while we were offline.
@@ -4465,6 +4466,8 @@  void kvm_s390_vcpu_stop(struct kvm_vcpu *vcpu)
 	kvm_s390_clear_stop_irq(vcpu);
 
 	kvm_s390_set_cpuflags(vcpu, CPUSTAT_STOPPED);
+	/* Let's tell the UV that we successfully stopped the vcpu */
+	kvm_s390_pv_set_cpu_state(vcpu, PV_CPU_STATE_STP);
 	__disable_ibs_on_vcpu(vcpu);
 
 	for (i = 0; i < online_vcpus; i++) {
diff --git a/arch/s390/kvm/pv.c b/arch/s390/kvm/pv.c
index 70e452192468..a58f5106ba5f 100644
--- a/arch/s390/kvm/pv.c
+++ b/arch/s390/kvm/pv.c
@@ -253,3 +253,22 @@  int kvm_s390_pv_unpack(struct kvm *kvm, unsigned long addr, unsigned long size,
 	VM_EVENT(kvm, 3, "PROTVIRT VM UNPACK: finished with rc %x", rc);
 	return rc;
 }
+
+int kvm_s390_pv_set_cpu_state(struct kvm_vcpu *vcpu, u8 state)
+{
+	int rc;
+	struct uv_cb_cpu_set_state uvcb = {
+		.header.cmd	= UVC_CMD_CPU_SET_STATE,
+		.header.len	= sizeof(uvcb),
+		.cpu_handle	= kvm_s390_pv_handle_cpu(vcpu),
+		.state		= state,
+	};
+
+	if (!kvm_s390_pv_handle_cpu(vcpu))
+		return -EINVAL;
+
+	rc = uv_call(0, (u64)&uvcb);
+	if (rc)
+		return -EINVAL;
+	return 0;
+}