diff options
| author | Christian Borntraeger <borntraeger@de.ibm.com> | 2019-02-20 03:04:07 -0500 |
|---|---|---|
| committer | Christian Borntraeger <borntraeger@de.ibm.com> | 2019-04-18 12:57:53 +0200 |
| commit | d668139718a9e2260702777bd8d86d71c30b6539 (patch) | |
| tree | b017d221475d876233d27112993b57143067f539 | |
| parent | 13209ad0395c4de7fa48108b1dac72e341d5c089 (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>
| -rw-r--r-- | arch/s390/kvm/kvm-s390.c | 13 |
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; |