github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-09-24 06:24:02 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

LoongArch: KVM: Advertise already-supported capabilities

Browse Source 
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>
This commit is contained in:
Tao Cui 2026-08-10 12:21:50 +08:00 committed by Huacai Chen
parent db2ddb8714
commit a5518ad7ef
1 changed files with 4 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
arch/loongarch/kvm/vm.c
View File

@ -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;