KVM: s390: Multiple Epoch Facility support
Allow for the enablement of MEF and the support for the extended
epoch in SIE and VSIE for the extended guest TOD-Clock.
A new interface is used for getting/setting a guest's extended TOD-Clock
that uses a single ioctl invocation, KVM_S390_VM_TOD_EXT. Since the
host time is a moving target that might see an epoch switch or STP sync
checks we need an atomic ioctl and cannot use the exisiting two
interfaces. The old method of getting and setting the guest TOD-Clock is
still retained and is used when the old ioctls are called.
Signed-off-by: Collin L. Walling <walling@linux.vnet.ibm.com>
Reviewed-by: Janosch Frank <frankja@linux.vnet.ibm.com>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.vnet.ibm.com>
Reviewed-by: Jason J. Herne <jjherne@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h
index a409d59..51375e7 100644
--- a/arch/s390/include/asm/kvm_host.h
+++ b/arch/s390/include/asm/kvm_host.h
@@ -226,7 +226,9 @@ struct kvm_s390_sie_block {
#define ECB3_RI 0x01
__u8 ecb3; /* 0x0063 */
__u32 scaol; /* 0x0064 */
- __u8 reserved68[4]; /* 0x0068 */
+ __u8 reserved68; /* 0x0068 */
+ __u8 epdx; /* 0x0069 */
+ __u8 reserved6a[2]; /* 0x006a */
__u32 todpr; /* 0x006c */
__u8 reserved70[16]; /* 0x0070 */
__u64 mso; /* 0x0080 */
@@ -265,6 +267,7 @@ struct kvm_s390_sie_block {
__u64 cbrlo; /* 0x01b8 */
__u8 reserved1c0[8]; /* 0x01c0 */
#define ECD_HOSTREGMGMT 0x20000000
+#define ECD_MEF 0x08000000
__u32 ecd; /* 0x01c8 */
__u8 reserved1cc[18]; /* 0x01cc */
__u64 pp; /* 0x01de */
@@ -739,6 +742,7 @@ struct kvm_arch{
struct kvm_s390_cpu_model model;
struct kvm_s390_crypto crypto;
struct kvm_s390_vsie vsie;
+ u8 epdx;
u64 epoch;
struct kvm_s390_migration_state *migration_state;
/* subset of available cpu features enabled by user space */