KVM: s390: MSA8 feature for guests

- Detect all function codes for KMA and export the features
   for use in the cpu model
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Merge tag 'kvm-s390-next-4.12-3' of git://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux into HEAD

KVM: s390: MSA8 feature for guests

- Detect all function codes for KMA and export the features
  for use in the cpu model

Documentation/virtual/kvm/devices/vm.txt

@@ -140,7 +140,8 @@ struct kvm_s390_vm_cpu_subfunc {
        u8 kmo[16];           # valid with Message-Security-Assist-Extension 4
        u8 pcc[16];           # valid with Message-Security-Assist-Extension 4
        u8 ppno[16];          # valid with Message-Security-Assist-Extension 5
-       u8 reserved[1824];    # reserved for future instructions
+       u8 kma[16];           # valid with Message-Security-Assist-Extension 8
+       u8 reserved[1808];    # reserved for future instructions
 };
 
 Parameters: address of a buffer to load the subfunction blocks from.

arch/s390/include/asm/cpacf.h

@@ -26,6 +26,7 @@
 #define CPACF_PCC		0xb92c		/* MSA4 */
 #define CPACF_KMCTR		0xb92d		/* MSA4 */
 #define CPACF_PPNO		0xb93c		/* MSA5 */
+#define CPACF_KMA		0xb929		/* MSA8 */
 
 /*
  * En/decryption modifier bits
@@ -149,8 +150,8 @@ static inline void __cpacf_query(unsigned int opcode, cpacf_mask_t *mask)
 
 	asm volatile(
 		"	spm 0\n" /* pckmo doesn't change the cc */
-		/* Parameter registers are ignored, but may not be 0 */
-		"0:	.insn	rrf,%[opc] << 16,2,2,2,0\n"
+		/* Parameter regs are ignored, but must be nonzero and unique */
+		"0:	.insn	rrf,%[opc] << 16,2,4,6,0\n"
 		"	brc	1,0b\n"	/* handle partial completion */
 		: "=m" (*mask)
 		: [fc] "d" (r0), [pba] "a" (r1), [opc] "i" (opcode)

arch/s390/include/uapi/asm/kvm.h

@@ -141,7 +141,8 @@ struct kvm_s390_vm_cpu_subfunc {
 	__u8 kmo[16];		/* with MSA4 */
 	__u8 pcc[16];		/* with MSA4 */
 	__u8 ppno[16];		/* with MSA5 */
-	__u8 reserved[1824];
+	__u8 kma[16];		/* with MSA8 */
+	__u8 reserved[1808];
 };
 
 /* kvm attributes for crypto */

arch/s390/kvm/kvm-s390.c

@@ -276,6 +276,10 @@ static void kvm_s390_cpu_feat_init(void)
 		__cpacf_query(CPACF_PPNO, (cpacf_mask_t *)
 			      kvm_s390_available_subfunc.ppno);
 
+	if (test_facility(146)) /* MSA8 */
+		__cpacf_query(CPACF_KMA, (cpacf_mask_t *)
+			      kvm_s390_available_subfunc.kma);
+
 	if (MACHINE_HAS_ESOP)
 		allow_cpu_feat(KVM_S390_VM_CPU_FEAT_ESOP);
 	/*

arch/s390/tools/gen_facilities.c

@@ -82,6 +82,7 @@ static struct facility_def facility_defs[] = {
 			78, /* enhanced-DAT 2 */
 			130, /* instruction-execution-protection */
 			131, /* enhanced-SOP 2 and side-effect */
+			146, /* msa extension 8 */
 			-1  /* END */
 		}
 	},

tools/arch/s390/include/uapi/asm/kvm.h

@@ -131,7 +131,8 @@ struct kvm_s390_vm_cpu_subfunc {
 	__u8 kmo[16];		/* with MSA4 */
 	__u8 pcc[16];		/* with MSA4 */
 	__u8 ppno[16];		/* with MSA5 */
-	__u8 reserved[1824];
+	__u8 kma[16];		/* with MSA8 */
+	__u8 reserved[1808];
 };
 
 /* kvm attributes for crypto */