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SubjectRe: [RFC PATCH 1/2] KVM: x86: Add a framework for supporting MSR-based features
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On 08/02/2018 23:58, Tom Lendacky wrote:
> +bool kvm_valid_msr_feature(u32 msr, u64 data)
> +{
> + unsigned int i;
> +
> + for (i = 0; i < num_msr_based_features; i++) {
> + struct kvm_msr_based_features *m = msr_based_features + i;
> +
> + if (msr != m->msr)
> + continue;
> +
> + /* Make sure not trying to change unsupported bits */
> + return (data & ~m->mask) ? false : true;
> + }
> +
> + return false;
> +}
> +EXPORT_SYMBOL_GPL(kvm_valid_msr_feature);
> +

This is probably unnecessary too (the allowed values are a bit more
complicated for, you just guessed it, VMX capability MSRs) and you can
just check bits other than LFENCE in svm_set_msr.

Paolo

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