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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: 5c919412fe ("kvm/x86: Hyper-V synthetic interrupt controller")
Signed-off-by: Aaron Lewis <aaronlewis@google.com>
Message-Id: <20220214212950.1776943-1-aaronlewis@google.com>
Cc: stable@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Aaron Lewis 2022-02-14 21:29:51 +00:00 committed by Paolo Bonzini
parent 710c476514
commit 127770ac0d
2 changed files with 2 additions and 1 deletions
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2
Documentation/virt/kvm/api.rst
View File

@ -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

1
arch/x86/kvm/x86.c
View File

@ -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: