Introduce a new capability KVM_CAP_ARM_ID_REG_WRITABLE to indicate that ID registers are writable by userspace. Signed-off-by: Reiji Watanabe <reijiw@xxxxxxxxxx> --- Documentation/virt/kvm/api.rst | 8 ++++++++ arch/arm64/kvm/arm.c | 1 + include/uapi/linux/kvm.h | 1 + 3 files changed, 10 insertions(+) diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst index a6729c8cf063..f7dfb5127310 100644 --- a/Documentation/virt/kvm/api.rst +++ b/Documentation/virt/kvm/api.rst @@ -7265,3 +7265,11 @@ The argument to KVM_ENABLE_CAP is also a bitmask, and must be a subset of the result of KVM_CHECK_EXTENSION. KVM will forward to userspace the hypercalls whose corresponding bit is in the argument, and return ENOSYS for the others. + +8.35 KVM_CAP_ARM_ID_REG_WRITABLE +-------------------------------- + +:Architectures: arm64 + +This capability indicates that userspace can modify the ID registers +via KVM_SET_ONE_REG ioctl. diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c index 528058920b64..87b8432f5719 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -197,6 +197,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) case KVM_CAP_SET_GUEST_DEBUG: case KVM_CAP_VCPU_ATTRIBUTES: case KVM_CAP_PTP_KVM: + case KVM_CAP_ARM_ID_REG_WRITABLE: r = 1; break; case KVM_CAP_SET_GUEST_DEBUG2: diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h index a067410ebea5..3345a57f05a6 100644 --- a/include/uapi/linux/kvm.h +++ b/include/uapi/linux/kvm.h @@ -1112,6 +1112,7 @@ struct kvm_ppc_resize_hpt { #define KVM_CAP_BINARY_STATS_FD 203 #define KVM_CAP_EXIT_ON_EMULATION_FAILURE 204 #define KVM_CAP_ARM_MTE 205 +#define KVM_CAP_ARM_ID_REG_WRITABLE 206 #ifdef KVM_CAP_IRQ_ROUTING -- 2.33.1.1089.g2158813163f-goog _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/mailman/listinfo/kvmarm