Commit 127770ac authored by Aaron Lewis's avatar Aaron Lewis Committed by Paolo Bonzini
Browse files

KVM: x86: Add KVM_CAP_ENABLE_CAP to x86 



Follow the precedent set by other architectures that support the VCPU
ioctl, KVM_ENABLE_CAP, and advertise the VM extension, KVM_CAP_ENABLE_CAP.
This way, userspace can ensure that KVM_ENABLE_CAP is available on a
vcpu before using it.

Fixes: 5c919412 ("kvm/x86: Hyper-V synthetic interrupt controller")
Signed-off-by: default avatarAaron Lewis <aaronlewis@google.com>
Message-Id: <20220214212950.1776943-1-aaronlewis@google.com>
Cc: stable@vger.kernel.org
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 710c4765

Documentation/virt/kvm/api.rst

+1 −1
Original line number Diff line number Diff line
@@ -1394,7 +1394,7 @@ documentation when it pops into existence). 
-------------------



:Capability: KVM_CAP_ENABLE_CAP

:Architectures: mips, ppc, s390

:Architectures: mips, ppc, s390, x86

:Type: vcpu ioctl

:Parameters: struct kvm_enable_cap (in)

:Returns: 0 on success; -1 on error

arch/x86/kvm/x86.c

+1 −0
Original line number Diff line number Diff line
@@ -4233,6 +4233,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) 
	case KVM_CAP_EXIT_ON_EMULATION_FAILURE:

	case KVM_CAP_VCPU_ATTRIBUTES:

	case KVM_CAP_SYS_ATTRIBUTES:

	case KVM_CAP_ENABLE_CAP:

		r = 1;

		break;

	case KVM_CAP_EXIT_HYPERCALL: