Avi, Marcelo,
let me know if you would prefer to reuse another register load/save ioctls
that is still unused for s390 (e.g. XCRS).
From: Christian Borntraeger <borntraeger@xxxxxxxxxx>
For guest relocation and virsh dump qemu needs an interface to
get/set additional registers from kvm. We also need the prefix
register for all guest memory accesses to the prefix pages.
The prefix register could also be set via the KVM_S390_SIGP_SET_PREFIX
interrupt ioctl, but I also added the synchronous operation to have
o symmetry: we want to have the same struct for get/set routine
o the interrupt is only delivered before entering the SIE, we also
want to cover the sequence set prefix/store status at prefix
Signed-off-by: Christian Borntraeger <borntraeger@xxxxxxxxxx>
---
arch/s390/include/asm/kvm.h | 9 +++++++++
arch/s390/kvm/kvm-s390.c | 24 ++++++++++++++++++++++++
include/linux/kvm.h | 4 ++++
3 files changed, 37 insertions(+)
Index: b/arch/s390/include/asm/kvm.h
===================================================================
--- a/arch/s390/include/asm/kvm.h
+++ b/arch/s390/include/asm/kvm.h
@@ -28,6 +28,15 @@ struct kvm_sregs {
__u64 crs[16];
};
+/* for KVM_S390_GET_SREGS2 and KVM_S390_SET_SREGS2 */
+struct kvm_s390_sregs2 {
+ __u64 ckc;
+ __u64 cputm;
+ __u64 gbea;
+ __u32 todpr;
+ __u32 prefix;
+};
+
/* for KVM_GET_FPU and KVM_SET_FPU */
struct kvm_fpu {
__u32 fpc;
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_S390_SREGS2:
r = 1;
break;
default:
@@ -673,6 +674,29 @@ long kvm_arch_vcpu_ioctl(struct file *fi
case KVM_S390_INITIAL_RESET:
r = kvm_arch_vcpu_ioctl_initial_reset(vcpu);
break;
+ case KVM_S390_GET_SREGS2: {
+ struct kvm_s390_sregs2 sregs2;
+
+ sregs2.prefix = vcpu->arch.sie_block->prefix;
+ sregs2.gbea = vcpu->arch.sie_block->gbea;
+ sregs2.cputm = vcpu->arch.sie_block->cputm;
+ sregs2.ckc = vcpu->arch.sie_block->ckc;
+ sregs2.todpr = vcpu->arch.sie_block->todpr;
+ r = copy_to_user(argp, &sregs2, sizeof(sregs2));
+ break;
+ }
+ case KVM_S390_SET_SREGS2: {
+ struct kvm_s390_sregs2 sregs2;
+
+ vcpu->arch.sie_block->prefix = sregs2.prefix;
+ vcpu->arch.sie_block->gbea = sregs2.gbea;
+ vcpu->arch.sie_block->cputm = sregs2.cputm;
+ vcpu->arch.sie_block->ckc = sregs2.ckc;
+ vcpu->arch.sie_block->todpr = sregs2.todpr;
+ r = copy_from_user(&sregs2, argp, sizeof(sregs2));
+ vcpu->arch.sie_block->ihcpu = 0xffff;
+ break;
+ }
default:
r = -EINVAL;
}
Index: b/include/linux/kvm.h
===================================================================
--- a/include/linux/kvm.h
+++ b/include/linux/kvm.h
@@ -557,6 +557,7 @@ struct kvm_ppc_pvinfo {
#define KVM_CAP_MAX_VCPUS 66 /* returns max vcpus per vm */
#define KVM_CAP_PPC_PAPR 68
#define KVM_CAP_S390_GMAP 71
+#define KVM_CAP_S390_SREGS2 72
#ifdef KVM_CAP_IRQ_ROUTING
@@ -762,6 +763,9 @@ struct kvm_clock_data {
#define KVM_CREATE_SPAPR_TCE _IOW(KVMIO, 0xa8, struct kvm_create_spapr_tce)
/* Available with KVM_CAP_RMA */
#define KVM_ALLOCATE_RMA _IOR(KVMIO, 0xa9, struct kvm_allocate_rma)
+/* Available with KVM_CAP_S390_SREGS2 */
+#define KVM_S390_GET_SREGS2 _IOR(KVMIO, 0xaa, struct kvm_s390_sregs2)
+#define KVM_S390_SET_SREGS2 _IOW(KVMIO, 0xab, struct kvm_s390_sregs2)
#define KVM_DEV_ASSIGN_ENABLE_IOMMU (1 << 0)
--
To unsubscribe from this list: send the line "unsubscribe kvm" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
