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KVM: s390: represent SIMD cap in kvm facility

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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>
This commit is contained in:
Michael Mueller 2015-03-16 16:05:41 +01:00 committed by Christian Borntraeger
parent 400ac6cd73
commit 18280d8b4b
3 changed files with 22 additions and 9 deletions
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1
arch/s390/include/asm/kvm_host.h
View File

@ -562,7 +562,6 @@ struct kvm_arch{
int css_support;
int use_irqchip;
int use_cmma;
int use_vectors;
int user_cpu_state_ctrl;
int user_sigp;
int user_stsi;

19
arch/s390/kvm/kvm-s390.c
View File

@ -278,8 +278,12 @@ static int kvm_vm_ioctl_enable_cap(struct kvm *kvm, struct kvm_enable_cap *cap)
r = 0;
break;
case KVM_CAP_S390_VECTOR_REGISTERS:
kvm->arch.use_vectors = MACHINE_HAS_VX;
r = MACHINE_HAS_VX ? 0 : -EINVAL;
if (MACHINE_HAS_VX) {
set_kvm_facility(kvm->arch.model.fac->mask, 129);
set_kvm_facility(kvm->arch.model.fac->list, 129);
r = 0;
} else
r = -EINVAL;
break;
case KVM_CAP_S390_USER_STSI:
kvm->arch.user_stsi = 1;
@ -1084,7 +1088,6 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
kvm->arch.css_support = 0;
kvm->arch.use_irqchip = 0;
kvm->arch.use_vectors = 0;
kvm->arch.epoch = 0;
spin_lock_init(&kvm->arch.start_stop_lock);
@ -1186,12 +1189,12 @@ int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
{
save_fp_ctl(&vcpu->arch.host_fpregs.fpc);
if (vcpu->kvm->arch.use_vectors)
if (test_kvm_facility(vcpu->kvm, 129))
save_vx_regs((__vector128 *)&vcpu->arch.host_vregs->vrs);
else
save_fp_regs(vcpu->arch.host_fpregs.fprs);
save_access_regs(vcpu->arch.host_acrs);
if (vcpu->kvm->arch.use_vectors) {
if (test_kvm_facility(vcpu->kvm, 129)) {
restore_fp_ctl(&vcpu->run->s.regs.fpc);
restore_vx_regs((__vector128 *)&vcpu->run->s.regs.vrs);
} else {
@ -1207,7 +1210,7 @@ void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
{
atomic_clear_mask(CPUSTAT_RUNNING, &vcpu->arch.sie_block->cpuflags);
gmap_disable(vcpu->arch.gmap);
if (vcpu->kvm->arch.use_vectors) {
if (test_kvm_facility(vcpu->kvm, 129)) {
save_fp_ctl(&vcpu->run->s.regs.fpc);
save_vx_regs((__vector128 *)&vcpu->run->s.regs.vrs);
} else {
@ -1216,7 +1219,7 @@ void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
}
save_access_regs(vcpu->run->s.regs.acrs);
restore_fp_ctl(&vcpu->arch.host_fpregs.fpc);
if (vcpu->kvm->arch.use_vectors)
if (test_kvm_facility(vcpu->kvm, 129))
restore_vx_regs((__vector128 *)&vcpu->arch.host_vregs->vrs);
else
restore_fp_regs(vcpu->arch.host_fpregs.fprs);
@ -1316,7 +1319,7 @@ int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
vcpu->arch.sie_block->eca |= 1;
if (sclp_has_sigpif())
vcpu->arch.sie_block->eca |= 0x10000000U;
if (vcpu->kvm->arch.use_vectors) {
if (test_kvm_facility(vcpu->kvm, 129)) {
vcpu->arch.sie_block->eca |= 0x00020000;
vcpu->arch.sie_block->ecd |= 0x20000000;
}

11
arch/s390/kvm/kvm-s390.h
View File

@ -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)
{