From: Janosch Frank <frankja@xxxxxxxxxxxxx>
For protected VMs, the VCPU resets are done by the Ultravisor, as KVM
has no access to the VCPU registers.
As the Ultravisor will only accept a call for the reset that is
needed, we need to fence the UV calls when chaining resets.
Signed-off-by: Janosch Frank <frankja@xxxxxxxxxxxxx>
---
arch/s390/kvm/kvm-s390.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 3e4716b3fc02..f7a3f84be064 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -4699,6 +4699,7 @@ long kvm_arch_vcpu_ioctl(struct file *filp,
void __user *argp = (void __user *)arg;
int idx;
long r;
+ u32 ret;
vcpu_load(vcpu);
@@ -4720,14 +4721,33 @@ long kvm_arch_vcpu_ioctl(struct file *filp,
case KVM_S390_CLEAR_RESET:
r = 0;
kvm_arch_vcpu_ioctl_clear_reset(vcpu);
+ if (kvm_s390_pv_handle_cpu(vcpu)) {
+ r = uv_cmd_nodata(kvm_s390_pv_handle_cpu(vcpu),
+ UVC_CMD_CPU_RESET_CLEAR, &ret);
+ VCPU_EVENT(vcpu, 3, "PROTVIRT RESET CLEAR VCPU: cpu %d rc %x rrc %x",
+ vcpu->vcpu_id, ret >> 16, ret & 0x0000ffff);
+ }
break;
case KVM_S390_INITIAL_RESET:
r = 0;
kvm_arch_vcpu_ioctl_initial_reset(vcpu);
+ if (kvm_s390_pv_handle_cpu(vcpu)) {
+ r = uv_cmd_nodata(kvm_s390_pv_handle_cpu(vcpu),
+ UVC_CMD_CPU_RESET_INITIAL,
+ &ret);
+ VCPU_EVENT(vcpu, 3, "PROTVIRT RESET INITIAL VCPU: cpu %d rc %x rrc %x",
+ vcpu->vcpu_id, ret >> 16, ret & 0x0000ffff);
+ }
break;
case KVM_S390_NORMAL_RESET:
r = 0;
kvm_arch_vcpu_ioctl_normal_reset(vcpu);
+ if (kvm_s390_pv_handle_cpu(vcpu)) {
+ r = uv_cmd_nodata(kvm_s390_pv_handle_cpu(vcpu),
+ UVC_CMD_CPU_RESET, &ret);
+ VCPU_EVENT(vcpu, 3, "PROTVIRT RESET NORMAL VCPU: cpu %d rc %x rrc %x",
+ vcpu->vcpu_id, ret >> 16, ret & 0x0000ffff);
+ }
break;
case KVM_SET_ONE_REG:
case KVM_GET_ONE_REG: {
--
2.24.0
