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KVM: s390: add concurrent-function facility to cpu model

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Adding support for concurrent-functions facility which provides
additional subfunctions.

Signed-off-by: Hendrik Brueckner <brueckner@linux.ibm.com>
Reviewed-by: Christian Borntraeger <borntraeger@linux.ibm.com>
Link: https://lore.kernel.org/r/20241107152319.77816-2-brueckner@linux.ibm.com
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Message-ID: <20241107152319.77816-2-brueckner@linux.ibm.com>
This commit is contained in:
Hendrik Brueckner 2024-11-07 16:23:16 +01:00 • committed by Janosch Frank
parent b638094440
commit 66ff6bf59b
3 changed files with 25 additions and 1 deletions
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3
arch/s390/include/uapi/asm/kvm.h
View file

@ -469,7 +469,8 @@ struct kvm_s390_vm_cpu_subfunc {
__u8 kdsa[16]; /* with MSA9 */
__u8 sortl[32]; /* with STFLE.150 */
__u8 dfltcc[32]; /* with STFLE.151 */
__u8 reserved[1728];
__u8 pfcr[16]; /* with STFLE.201 */
__u8 reserved[1712];
};
#define KVM_S390_VM_CPU_PROCESSOR_UV_FEAT_GUEST 6

22
arch/s390/kvm/kvm-s390.c
View file

@ -348,6 +348,16 @@ static inline int plo_test_bit(unsigned char nr)
return cc == 0;
}
static __always_inline void pfcr_query(u8 (*query)[16])
{
asm volatile(
" lghi 0,0\n"
" .insn rsy,0xeb0000000016,0,0,%[query]\n"
: [query] "=QS" (*query)
:
: "cc", "0");
}
static __always_inline void __sortl_query(u8 (*query)[32])
{
asm volatile(
@ -429,6 +439,9 @@ static void __init kvm_s390_cpu_feat_init(void)
if (test_facility(151)) /* DFLTCC */
__dfltcc_query(&kvm_s390_available_subfunc.dfltcc);
if (test_facility(201)) /* PFCR */
pfcr_query(&kvm_s390_available_subfunc.pfcr);
if (MACHINE_HAS_ESOP)
allow_cpu_feat(KVM_S390_VM_CPU_FEAT_ESOP);
/*
@ -1543,6 +1556,9 @@ static int kvm_s390_set_processor_subfunc(struct kvm *kvm,
((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[1],
((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[2],
((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[3]);
VM_EVENT(kvm, 3, "GET: guest PFCR subfunc 0x%16.16lx.%16.16lx",
((unsigned long *) &kvm_s390_available_subfunc.pfcr)[0],
((unsigned long *) &kvm_s390_available_subfunc.pfcr)[1]);
return 0;
}
@ -1757,6 +1773,9 @@ static int kvm_s390_get_processor_subfunc(struct kvm *kvm,
((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[1],
((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[2],
((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[3]);
VM_EVENT(kvm, 3, "GET: guest PFCR subfunc 0x%16.16lx.%16.16lx",
((unsigned long *) &kvm_s390_available_subfunc.pfcr)[0],
((unsigned long *) &kvm_s390_available_subfunc.pfcr)[1]);
return 0;
}
@ -1825,6 +1844,9 @@ static int kvm_s390_get_machine_subfunc(struct kvm *kvm,
((unsigned long *) &kvm_s390_available_subfunc.dfltcc)[1],
((unsigned long *) &kvm_s390_available_subfunc.dfltcc)[2],
((unsigned long *) &kvm_s390_available_subfunc.dfltcc)[3]);
VM_EVENT(kvm, 3, "GET: host PFCR subfunc 0x%16.16lx.%16.16lx",
((unsigned long *) &kvm_s390_available_subfunc.pfcr)[0],
((unsigned long *) &kvm_s390_available_subfunc.pfcr)[1]);
return 0;
}

1
arch/s390/tools/gen_facilities.c
View file

@ -113,6 +113,7 @@ static struct facility_def facility_defs[] = {
194, /* rdp enhancement facility */
196, /* processor activity instrumentation facility */
197, /* processor activity instrumentation extension 1 */
201, /* concurrent-functions facility */
-1 /* END */
}
},