| Message ID | 1531905547-25478-20-git-send-email-suzuki.poulose@arm.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h index b6270a3..9a40d82 100644 --- a/include/uapi/linux/kvm.h +++ b/include/uapi/linux/kvm.h @@ -949,6 +949,7 @@ struct kvm_ppc_resize_hpt { #define KVM_CAP_GET_MSR_FEATURES 153 #define KVM_CAP_HYPERV_EVENTFD 154 #define KVM_CAP_HYPERV_TLBFLUSH 155 +#define KVM_CAP_ARM_VM_MAX_PHYS_SHIFT 156 /* returns max IPA shift for a VM */ #ifdef KVM_CAP_IRQ_ROUTING diff --git a/virt/kvm/arm/arm.c b/virt/kvm/arm/arm.c index 135d789..220d886 100644 --- a/virt/kvm/arm/arm.c +++ b/virt/kvm/arm/arm.c @@ -242,6 +242,9 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) */ r = 1; break; + case KVM_CAP_ARM_VM_MAX_PHYS_SHIFT: + r = kvm_ipa_limit; + break; default: r = kvm_arch_dev_ioctl_check_extension(kvm, ext); break;
Advertise the maximum physical address size supported by the host for a VM as a capability (like max_vcpus and memslots). This could be used by the userspace to choose the appropriate size for a given VM. Cc: Christoffer Dall <cdall@kernel.org> Cc: Marc Zyngier <marc.zyngier@arm.com> Cc: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> --- Changes since V3: - Switch to a CAP, that can be checkd via EXTENSIONS on KVM device fd, rather than a dedicated ioctl. --- include/uapi/linux/kvm.h | 1 + virt/kvm/arm/arm.c | 3 +++ 2 files changed, 4 insertions(+)