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authorPaolo Bonzini <pbonzini@redhat.com>2022-08-11 12:41:25 -0400
committerPaolo Bonzini <pbonzini@redhat.com>2022-09-01 19:20:59 -0400
commit22c6a0ef6b2631cda406a9c0c26774b0b3463b7b (patch)
tree246ddf94bf8b00929b920c1b92417b61664d963f
parent87693645ae89d9f9779e0bc53606bf228ec36411 (diff)
KVM: x86: check validity of argument to KVM_SET_MP_STATE
An invalid argument to KVM_SET_MP_STATE has no effect other than making the vCPU fail to run at the next KVM_RUN. Since it is extremely unlikely that any userspace is relying on it, fail with -EINVAL just like for other architectures. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
-rw-r--r--arch/x86/kvm/x86.c20
1 files changed, 17 insertions, 3 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 54ee086943c1..43a6a7efc6ec 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -10669,7 +10669,8 @@ static inline int vcpu_block(struct kvm_vcpu *vcpu)
case KVM_MP_STATE_INIT_RECEIVED:
break;
default:
- return -EINTR;
+ WARN_ON_ONCE(1);
+ break;
}
return 1;
}
@@ -11110,9 +11111,22 @@ int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
vcpu_load(vcpu);
- if (!lapic_in_kernel(vcpu) &&
- mp_state->mp_state != KVM_MP_STATE_RUNNABLE)
+ switch (mp_state->mp_state) {
+ case KVM_MP_STATE_UNINITIALIZED:
+ case KVM_MP_STATE_HALTED:
+ case KVM_MP_STATE_AP_RESET_HOLD:
+ case KVM_MP_STATE_INIT_RECEIVED:
+ case KVM_MP_STATE_SIPI_RECEIVED:
+ if (!lapic_in_kernel(vcpu))
+ goto out;
+ break;
+
+ case KVM_MP_STATE_RUNNABLE:
+ break;
+
+ default:
goto out;
+ }
/*
* KVM_MP_STATE_INIT_RECEIVED means the processor is in