Commit d6681397 authored Feb 20, 2019 by Christian Borntraeger

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>

parent 13209ad0

arch/s390/kvm/kvm-s390.c

+13 −0

Original line number	Diff line number	Diff line
		@@ -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;

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