> The diff is just
>
> diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
> index d6fe958a0403..09ccf6c09435 100644
> --- a/arch/x86/kvm/vmx.c
> +++ b/arch/x86/kvm/vmx.c
> @@ -8305,6 +8305,8 @@ static int nested_vmx_check_msr_switch(struct kvm_vcpu
> *vcpu,
> WARN_ON(1);
> return -EINVAL;
> }
> + if (count == 0)
> + return 0;
> if (!IS_ALIGNED(addr, 16) || addr >> maxphyaddr ||
> (addr + count * sizeof(struct vmx_msr_entry) - 1) >> maxphyaddr) {
> pr_warn_ratelimited(
>
> right?
Yes. Without this check, `nested_vmx_check_msr_switch` returns -EINVAL
for count==0 and addr==0.
--
Eugene
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