[PATCH 6/6] kvm-s390: provide control registers via kvm_run

[Christian Borntraeger <borntraeger@xxxxxxxxxx>]

There are several cases were we need the control registers for
userspace. Lets also provide those in kvm_run.

Signed-off-by: Christian Borntraeger <borntraeger@xxxxxxxxxx>
---
 arch/s390/include/asm/kvm.h |    2 ++
 arch/s390/kvm/kvm-s390.c    |    9 ++++++++-
 2 files changed, 10 insertions(+), 1 deletions(-)

diff --git a/arch/s390/include/asm/kvm.h b/arch/s390/include/asm/kvm.h
index 9acbde4..9607667 100644
--- a/arch/s390/include/asm/kvm.h
+++ b/arch/s390/include/asm/kvm.h
@@ -44,10 +44,12 @@ struct kvm_guest_debug_arch {
 #define KVM_SYNC_PREFIX (1UL << 0)
 #define KVM_SYNC_GPRS   (1UL << 1)
 #define KVM_SYNC_ACRS   (1UL << 2)
+#define KVM_SYNC_CRS    (1UL << 3)
 /* definition of registers in kvm_run */
 struct kvm_sync_regs {
 	__u64 prefix;	/* prefix register */
 	__u64 gprs[16];	/* general purpose registers */
 	__u32 acrs[16];	/* access registers */
+	__u64 crs[16];	/* control registers */
 };
 #endif
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 121316e..cf3c0a9 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -291,7 +291,8 @@ int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
 	vcpu->arch.gmap = vcpu->kvm->arch.gmap;
 	vcpu->run->kvm_valid_regs = KVM_SYNC_PREFIX |
 				    KVM_SYNC_GPRS |
-				    KVM_SYNC_ACRS;
+				    KVM_SYNC_ACRS |
+				    KVM_SYNC_CRS;
 	return 0;
 }
 
@@ -580,6 +581,11 @@ rerun_vcpu:
 		kvm_run->kvm_dirty_regs &= ~KVM_SYNC_PREFIX;
 		kvm_s390_set_prefix(vcpu, kvm_run->s.regs.prefix);
 	}
+	if (kvm_run->kvm_dirty_regs & KVM_SYNC_CRS) {
+		kvm_run->kvm_dirty_regs &= ~KVM_SYNC_CRS;
+		memcpy(&vcpu->arch.sie_block->gcr, &kvm_run->s.regs.crs, 128);
+		kvm_s390_set_prefix(vcpu, kvm_run->s.regs.prefix);
+	}
 
 	might_fault();
 
@@ -629,6 +635,7 @@ 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;
+	memcpy(&kvm_run->s.regs.crs, &vcpu->arch.sie_block->gcr, 128);
 
 	if (vcpu->sigset_active)
 		sigprocmask(SIG_SETMASK, &sigsaved, NULL);
-- 
1.7.9

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