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@xxxxxxxxxx>
---
arch/s390/include/asm/kvm.h | 2 ++
arch/s390/kvm/kvm-s390.c | 7 +++++++
2 files changed, 9 insertions(+), 0 deletions(-)
diff --git a/arch/s390/include/asm/kvm.h b/arch/s390/include/asm/kvm.h
index 325560a..9fc328c 100644
--- a/arch/s390/include/asm/kvm.h
+++ b/arch/s390/include/asm/kvm.h
@@ -41,7 +41,9 @@ struct kvm_debug_exit_arch {
struct kvm_guest_debug_arch {
};
+#define KVM_SYNC_PREFIX (1UL << 0)
/* definition of registers in kvm_run */
struct kvm_sync_regs {
+ __u64 prefix; /* prefix register */
};
#endif
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 @@ int kvm_dev_ioctl_check_extension(long ext)
#ifdef CONFIG_KVM_S390_UCONTROL
case KVM_CAP_S390_UCONTROL:
#endif
+ case KVM_CAP_SYNC_REGS:
r = 1;
break;
default:
@@ -288,6 +289,7 @@ int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
}
vcpu->arch.gmap = vcpu->kvm->arch.gmap;
+ vcpu->run->kvm_valid_regs = KVM_SYNC_PREFIX;
return 0;
}
@@ -572,6 +574,10 @@ rerun_vcpu:
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 @@ rerun_vcpu:
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);
--
1.7.8.2
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