From: Sean Christopherson <seanjc@xxxxxxxxxx>
Since VMX and SVM both would never update the control bits if exits
are disable after vCPUs are created, only allow setting exits
disable flag before vCPU creation.
Fixes: 4d5422cea3b6 ("KVM: X86: Provide a capability to disable MWAIT
intercepts")
Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx>
Signed-off-by: Kechen Lu <kechenl@xxxxxxxxxx>
---
Documentation/virt/kvm/api.rst | 1 +
arch/x86/kvm/x86.c | 6 ++++++
2 files changed, 7 insertions(+)
diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst
index 11e00a46c610..d0d8749591a8 100644
--- a/Documentation/virt/kvm/api.rst
+++ b/Documentation/virt/kvm/api.rst
@@ -6933,6 +6933,7 @@ branch to guests' 0x200 interrupt vector.
:Architectures: x86
:Parameters: args[0] defines which exits are disabled
:Returns: 0 on success, -EINVAL when args[0] contains invalid exits
+ or if any vCPU has already been created
Valid bits in args[0] are::
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 158b2e135efc..3ac6329e6d43 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -6006,6 +6006,10 @@ int kvm_vm_ioctl_enable_cap(struct kvm *kvm,
if (cap->args[0] & ~KVM_X86_DISABLE_VALID_EXITS)
break;
+ mutex_lock(&kvm->lock);
+ if (kvm->created_vcpus)
+ goto disable_exits_unlock;
+
if ((cap->args[0] & KVM_X86_DISABLE_EXITS_MWAIT) &&
kvm_can_mwait_in_guest())
kvm->arch.mwait_in_guest = true;
@@ -6016,6 +6020,8 @@ int kvm_vm_ioctl_enable_cap(struct kvm *kvm,
if (cap->args[0] & KVM_X86_DISABLE_EXITS_CSTATE)
kvm->arch.cstate_in_guest = true;
r = 0;
+disable_exits_unlock:
+ mutex_unlock(&kvm->lock);
break;
case KVM_CAP_MSR_PLATFORM_INFO:
kvm->arch.guest_can_read_msr_platform_info = cap->args[0];
--
2.32.0
