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authorChristian Borntraeger <borntraeger@de.ibm.com>2019-02-20 03:04:07 -0500
committerChristian Borntraeger <borntraeger@de.ibm.com>2019-04-18 12:57:53 +0200
commitd668139718a9e2260702777bd8d86d71c30b6539 (patch)
treeb017d221475d876233d27112993b57143067f539 /arch/s390/kvm
parent13209ad0395c4de7fa48108b1dac72e341d5c089 (diff)
KVM: s390: provide query function for instructions returning 32 byte
Some of the new features have a 32byte response for the query function. Provide a new wrapper similar to __cpacf_query. We might want to factor this out if other users come up, as of today there is none. So let us keep the function within KVM. Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Reviewed-by: Collin Walling <walling@linux.ibm.com> Reviewed-by: David Hildenbrand <david@redhat.com>
Diffstat (limited to 'arch/s390/kvm')
-rw-r--r--arch/s390/kvm/kvm-s390.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 0dad61ccde3d..336e591d94eb 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -321,6 +321,19 @@ static inline int plo_test_bit(unsigned char nr)
return cc == 0;
}
+static inline void __insn32_query(unsigned int opcode, u8 query[32])
+{
+ register unsigned long r0 asm("0") = 0; /* query function */
+ register unsigned long r1 asm("1") = (unsigned long) query;
+
+ asm volatile(
+ /* Parameter regs are ignored */
+ " .insn rrf,%[opc] << 16,2,4,6,0\n"
+ : "=m" (*query)
+ : "d" (r0), "a" (r1), [opc] "i" (opcode)
+ : "cc");
+}
+
static void kvm_s390_cpu_feat_init(void)
{
int i;