From: Christian Borntraeger <borntraeger@xxxxxxxxxx>
The prefix register is a read-mostly value that is necessary to emulate
memory accesses in an architecture compliant-way. Avoid an additional
ioctl by providing the prefix content in the r/o section of kvm_run.
Signed-off-by: Christian Borntraeger <borntraeger@xxxxxxxxxx>
---
arch/s390/include/asm/kvm.h | 1 +
arch/s390/kvm/kvm-s390.c | 2 ++
2 files changed, 3 insertions(+)
Index: b/arch/s390/include/asm/kvm.h
===================================================================
--- a/arch/s390/include/asm/kvm.h
+++ b/arch/s390/include/asm/kvm.h
@@ -43,6 +43,7 @@ struct kvm_guest_debug_arch {
/* definition of registers in kvm_run */
struct sync_ro_regs {
+ __u32 prefix; /* prefix register */
};
struct sync_rw_regs {
Index: b/arch/s390/kvm/kvm-s390.c
===================================================================
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -129,6 +129,7 @@ int kvm_dev_ioctl_check_extension(long e
case KVM_CAP_S390_PSW:
case KVM_CAP_S390_GMAP:
case KVM_CAP_SYNC_MMU:
+ case KVM_CAP_SYNC_REGS:
r = 1;
break;
default:
@@ -556,6 +557,7 @@ rerun_vcpu:
kvm_run->psw_mask = vcpu->arch.sie_block->gpsw.mask;
kvm_run->psw_addr = vcpu->arch.sie_block->gpsw.addr;
+ kvm_run->sync_ro_regs.prefix = vcpu->arch.sie_block->prefix;
if (vcpu->sigset_active)
sigprocmask(SIG_SETMASK, &sigsaved, NULL);
--
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