This is a note to let you know that I've just added the patch titled
KVM: x86: Add KVM_CAP_ENABLE_CAP to x86
to the 5.16-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
kvm-x86-add-kvm_cap_enable_cap-to-x86.patch
and it can be found in the queue-5.16 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 768f4b6c9d9178cefd0355fde27e1d8aa3d3f89a
Author: Aaron Lewis <aaronlewis@xxxxxxxxxx>
Date: Mon Feb 14 21:29:51 2022 +0000
KVM: x86: Add KVM_CAP_ENABLE_CAP to x86
[ Upstream commit 127770ac0d043435375ab86434f31a93efa88215 ]
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: 5c919412fe61 ("kvm/x86: Hyper-V synthetic interrupt controller")
Signed-off-by: Aaron Lewis <aaronlewis@xxxxxxxxxx>
Message-Id: <20220214212950.1776943-1-aaronlewis@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst
index aeeb071c76881..9df9eadaeb5c2 100644
--- a/Documentation/virt/kvm/api.rst
+++ b/Documentation/virt/kvm/api.rst
@@ -1391,7 +1391,7 @@ 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
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 0714fa0e7ede0..c6eb3e45e3d80 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -4163,6 +4163,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
case KVM_CAP_SREGS2:
case KVM_CAP_EXIT_ON_EMULATION_FAILURE:
case KVM_CAP_VCPU_ATTRIBUTES:
+ case KVM_CAP_ENABLE_CAP:
r = 1;
break;
case KVM_CAP_EXIT_HYPERCALL:
