KVM: s390: split SIE state guest prefix field

This patch splits the SIE state guest prefix at offset 4
into a prefix bit field. Additionally it provides the
access functions:

 - kvm_s390_get_prefix()
 - kvm_s390_set_prefix()

to access the prefix per vcpu.

Signed-off-by: Michael Mueller <mimu@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h
index dc182a5b02b7..a27f5007062a 100644
--- a/arch/s390/include/asm/kvm_host.h
+++ b/arch/s390/include/asm/kvm_host.h
@@ -82,7 +82,9 @@ struct sca_block {
 
 struct kvm_s390_sie_block {
         atomic_t cpuflags;              /* 0x0000 */
-        __u32   prefix;                 /* 0x0004 */
+        __u32 : 1;                      /* 0x0004 */
+        __u32 prefix : 18;
+        __u32 : 13;
         __u8    reserved08[4];          /* 0x0008 */
 #define PROG_IN_SIE (1<<0)
         __u32   prog0c;                 /* 0x000c */