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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>
hifive-unleashed-5.2
Christian Borntraeger 2019-02-20 03:04:07 -05:00
parent 13209ad039
commit d668139718
1 changed files with 13 additions and 0 deletions
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13
arch/s390/kvm/kvm-s390.c
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@ -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;