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-rw-r--r--arch/mips/kvm/mips.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
index 35d3146895f1..bb68e8d520e8 100644
--- a/arch/mips/kvm/mips.c
+++ b/arch/mips/kvm/mips.c
@@ -880,6 +880,9 @@ static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu,
case KVM_CAP_MIPS_FPU:
vcpu->arch.fpu_enabled = true;
break;
+ case KVM_CAP_MIPS_MSA:
+ vcpu->arch.msa_enabled = true;
+ break;
default:
r = -EINVAL;
break;
@@ -1071,6 +1074,21 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
case KVM_CAP_MIPS_FPU:
r = !!cpu_has_fpu;
break;
+ case KVM_CAP_MIPS_MSA:
+ /*
+ * We don't support MSA vector partitioning yet:
+ * 1) It would require explicit support which can't be tested
+ * yet due to lack of support in current hardware.
+ * 2) It extends the state that would need to be saved/restored
+ * by e.g. QEMU for migration.
+ *
+ * When vector partitioning hardware becomes available, support
+ * could be added by requiring a flag when enabling
+ * KVM_CAP_MIPS_MSA capability to indicate that userland knows
+ * to save/restore the appropriate extra state.
+ */
+ r = cpu_has_msa && !(boot_cpu_data.msa_id & MSA_IR_WRPF);
+ break;
default:
r = 0;
break;