From: Christian Borntraeger Date: Wed, 20 Feb 2019 03:04:07 -0500 Subject: KVM: s390: provide query function for instructions returning 32 byte Git-commit: d668139718a9e2260702777bd8d86d71c30b6539 Patch-mainline: v5.2-rc1 References: jsc#SLE-6240 FATE#327380 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 Reviewed-by: Collin Walling Reviewed-by: David Hildenbrand Acked-by: Petr Tesarik --- arch/s390/kvm/kvm-s390.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -302,6 +302,19 @@ static inline int plo_test_bit(unsigned 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;