diff options
Diffstat (limited to 'target/arm/kvm64.c')
| -rw-r--r-- | target/arm/kvm64.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/target/arm/kvm64.c b/target/arm/kvm64.c index c93bbee425..876184b8fe 100644 --- a/target/arm/kvm64.c +++ b/target/arm/kvm64.c @@ -488,7 +488,9 @@ bool kvm_arm_get_host_cpu_features(ARMHostCPUFeatures *ahcf) * and then query that CPU for the relevant ID registers. */ int fdarray[3]; + bool sve_supported; uint64_t features = 0; + uint64_t t; int err; /* Old kernels may not know about the PREFERRED_TARGET ioctl: however @@ -578,13 +580,23 @@ bool kvm_arm_get_host_cpu_features(ARMHostCPUFeatures *ahcf) ARM64_SYS_REG(3, 0, 0, 3, 2)); } + sve_supported = ioctl(fdarray[0], KVM_CHECK_EXTENSION, KVM_CAP_ARM_SVE) > 0; + kvm_arm_destroy_scratch_host_vcpu(fdarray); if (err < 0) { return false; } - /* We can assume any KVM supporting CPU is at least a v8 + /* Add feature bits that can't appear until after VCPU init. */ + if (sve_supported) { + t = ahcf->isar.id_aa64pfr0; + t = FIELD_DP64(t, ID_AA64PFR0, SVE, 1); + ahcf->isar.id_aa64pfr0 = t; + } + + /* + * We can assume any KVM supporting CPU is at least a v8 * with VFPv4+Neon; this in turn implies most of the other * feature bits. */ |