On 13/07/2016 11:21, Yang Zhang wrote:
>>
>> +static int handle_desc(struct kvm_vcpu *vcpu)
>> +{
>> + WARN_ON(!(vcpu->arch.cr4 & X86_CR4_UMIP));
>
> I think WARN_ON is too heavy since a malicious guest may trigger it always.
I missed this---how so? Setting the bit is under "if ((cr4 &
X86_CR4_UMIP) && !boot_cpu_has(X86_FEATURE_UMIP))".
Paolo
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