KVM: s390: provide the prefix register via kvm_run
Add the prefix register to the synced register field in kvm_run.
While we need the prefix register most of the time read-only, this
patch also adds handling for guest dirtying of the prefix register.
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 1868b89..6962c1b 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -132,6 +132,7 @@
#ifdef CONFIG_KVM_S390_UCONTROL
case KVM_CAP_S390_UCONTROL:
#endif
+ case KVM_CAP_SYNC_REGS:
r = 1;
break;
default:
@@ -288,6 +289,7 @@
}
vcpu->arch.gmap = vcpu->kvm->arch.gmap;
+ vcpu->run->kvm_valid_regs = KVM_SYNC_PREFIX;
return 0;
}
@@ -572,6 +574,10 @@
vcpu->arch.sie_block->gpsw.mask = kvm_run->psw_mask;
vcpu->arch.sie_block->gpsw.addr = kvm_run->psw_addr;
+ if (kvm_run->kvm_dirty_regs & KVM_SYNC_PREFIX) {
+ kvm_run->kvm_dirty_regs &= ~KVM_SYNC_PREFIX;
+ kvm_s390_set_prefix(vcpu, kvm_run->s.regs.prefix);
+ }
might_fault();
@@ -620,6 +626,7 @@
kvm_run->psw_mask = vcpu->arch.sie_block->gpsw.mask;
kvm_run->psw_addr = vcpu->arch.sie_block->gpsw.addr;
+ kvm_run->s.regs.prefix = vcpu->arch.sie_block->prefix;
if (vcpu->sigset_active)
sigprocmask(SIG_SETMASK, &sigsaved, NULL);