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LoongArch: KVM: Add paravirt preempt feature in hypervisor side

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Feature KVM_FEATURE_PREEMPT is added to show whether vCPU is preempted
or not. It is to help guest OS scheduling or lock checking etc. Here
add KVM_FEATURE_PREEMPT feature and use one byte as preempted flag in
the steal time structure.

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
This commit is contained in:
Bibo Mao
2026-02-06 09:28:01 +08:00
committed by Huacai Chen
parent 2faec60a48
commit 9b486cdd03
6 changed files with 62 additions and 2 deletions
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3
arch/loongarch/kvm/vm.c
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@@ -52,7 +52,9 @@ static void kvm_vm_init_features(struct kvm *kvm)
kvm->arch.pv_features = BIT(KVM_FEATURE_IPI);
kvm->arch.kvm_features = BIT(KVM_LOONGARCH_VM_FEAT_PV_IPI);
if (kvm_pvtime_supported()) {
kvm->arch.pv_features |= BIT(KVM_FEATURE_PREEMPT);
kvm->arch.pv_features |= BIT(KVM_FEATURE_STEAL_TIME);
kvm->arch.kvm_features |= BIT(KVM_LOONGARCH_VM_FEAT_PV_PREEMPT);
kvm->arch.kvm_features |= BIT(KVM_LOONGARCH_VM_FEAT_PV_STEALTIME);
}
}
@@ -154,6 +156,7 @@ static int kvm_vm_feature_has_attr(struct kvm *kvm, struct kvm_device_attr *attr
case KVM_LOONGARCH_VM_FEAT_MSGINT:
case KVM_LOONGARCH_VM_FEAT_PMU:
case KVM_LOONGARCH_VM_FEAT_PV_IPI:
case KVM_LOONGARCH_VM_FEAT_PV_PREEMPT:
case KVM_LOONGARCH_VM_FEAT_PV_STEALTIME:
if (kvm_vm_support(&kvm->arch, attr->attr))
return 0;