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| author |   Michael Mueller <mimu@linux.vnet.ibm.com> | 2015-03-16 16:05:41 +0100 |
|---|---|---|
| committer |   Christian Borntraeger <borntraeger@de.ibm.com> | 2015-03-17 16:33:14 +0100 |
| commit | 18280d8b4bcd4a2b174ee3cd748166c6190acacb (patch) | |
| tree | ff82ed01c51560e596d7321ca27d3353e3bc7c93 /arch/s390/kvm/kvm-s390.h | |
| parent | KVM: s390: drop SIMD bit from kvm_s390_fac_list_mask (diff) | |
| download | linux-dev-18280d8b4bcd4a2b174ee3cd748166c6190acacb.tar.xz linux-dev-18280d8b4bcd4a2b174ee3cd748166c6190acacb.zip | |
KVM: s390: represent SIMD cap in kvm facility
The patch represents capability KVM_CAP_S390_VECTOR_REGISTERS by means
of the SIMD facility bit. This allows to a) disable the use of SIMD when
used in conjunction with a not-SIMD-aware QEMU, b) to enable SIMD when
used with a SIMD-aware version of QEMU and c) finally by means of a QEMU
version using the future cpu model ioctls.
Signed-off-by: Michael Mueller <mimu@linux.vnet.ibm.com>
Reviewed-by: Eric Farman <farman@linux.vnet.ibm.com>
Tested-by: Eric Farman <farman@linux.vnet.ibm.com>
Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Diffstat (limited to 'arch/s390/kvm/kvm-s390.h')
| -rw-r--r-- | arch/s390/kvm/kvm-s390.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/s390/kvm/kvm-s390.h b/arch/s390/kvm/kvm-s390.h index 5d54191e573e..c5aefef158e5 100644 --- a/arch/s390/kvm/kvm-s390.h +++ b/arch/s390/kvm/kvm-s390.h @@ -149,6 +149,17 @@ static inline int test_kvm_facility(struct kvm *kvm, unsigned long nr) __test_facility(nr, kvm->arch.model.fac->list); } +static inline int set_kvm_facility(u64 *fac_list, unsigned long nr) +{ + unsigned char *ptr; + + if (nr >= MAX_FACILITY_BIT) + return -EINVAL; + ptr = (unsigned char *) fac_list + (nr >> 3); + *ptr |= (0x80UL >> (nr & 7)); + return 0; +} + /* are cpu states controlled by user space */ static inline int kvm_s390_user_cpu_state_ctrl(struct kvm *kvm) { |