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| author | Tao Cui <cuitao@kylinos.cn> | 2026-08-10 12:21:50 +0800 |
|---|---|---|
| committer | Huacai Chen <chenhuacai@loongson.cn> | 2026-08-10 12:21:50 +0800 |
| commit | a5518ad7ef7dc1837258d37ba0a11dcb5d7ecaba (patch) | |
| tree | dd93d95e32fd498cb1e90b6438611855f5040728 | |
| parent | db2ddb87143519e20a95aa36c60b36107b736a58 (diff) | |
| download | linux-stable-a5518ad7ef7dc1837258d37ba0a11dcb5d7ecaba.tar.gz linux-stable-a5518ad7ef7dc1837258d37ba0a11dcb5d7ecaba.zip | |
LoongArch: KVM: Advertise already-supported capabilities
Several LoongArch KVM features are fully implemented but were never
reported through their standard KVM_CHECK_EXTENSION probes, so userspace
cannot discover them. Advertise the ones that already work so as to have
a real consumer:
- KVM_CAP_VCPU_ATTRIBUTES: per-vCPU device-attribute ioctls are
implemented (CPUCFG, PVTIME control); advertise the discovery cap.
- KVM_CAP_STEAL_TIME: steal time works end-to-end (host-side record
plus guest-side paravirt), the probe returns kvm_pvtime_supported().
This doesn't add new functionalities; it only makes existing features
discoverable via the standard probe.
Reviewed-by: Bibo Mao <maobibo@loongson.cn>
Signed-off-by: Tao Cui <cuitao@kylinos.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
| -rw-r--r-- | arch/loongarch/kvm/vm.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/loongarch/kvm/vm.c b/arch/loongarch/kvm/vm.c index 1317c718f896..0a51931d6f6e 100644 --- a/arch/loongarch/kvm/vm.c +++ b/arch/loongarch/kvm/vm.c @@ -122,6 +122,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) case KVM_CAP_IOEVENTFD: case KVM_CAP_MP_STATE: case KVM_CAP_SET_GUEST_DEBUG: + case KVM_CAP_VCPU_ATTRIBUTES: r = 1; break; case KVM_CAP_NR_VCPUS: @@ -136,6 +137,9 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) case KVM_CAP_NR_MEMSLOTS: r = KVM_USER_MEM_SLOTS; break; + case KVM_CAP_STEAL_TIME: + r = kvm_pvtime_supported(); + break; default: r = 0; break; |