On 29/07/2015 21:07, Alex Williamson wrote:
> diff --git a/arch/x86/kvm/mtrr.c b/arch/x86/kvm/mtrr.c
> index e275013..dc0a84a 100644
> --- a/arch/x86/kvm/mtrr.c
> +++ b/arch/x86/kvm/mtrr.c
> @@ -672,15 +672,16 @@ u8 kvm_mtrr_get_guest_memory_type(struct kvm_vcpu
> *vcpu, gfn_t gfn)
> if (iter.mtrr_disabled)
> return mtrr_disabled_type();
>
> - /* It is not covered by MTRRs. */
> - if (iter.partial_map) {
> - /*
> - * We just check one page, partially covered by MTRRs is
> - * impossible.
> - */
> - WARN_ON(type != -1);
> - type = mtrr_default_type(mtrr_state);
> - }
> + /*
> + * We just check one page, partially covered by MTRRs is
> + * impossible.
> + */
> + WARN_ON(iter.partial_map);
> +
> + /* not contained in any MTRRs. */
> + if (type == -1)
> + return mtrr_default_type(mtrr_state);
> +
> return type;
> }
> EXPORT_SYMBOL_GPL(kvm_mtrr_get_guest_memory_type);
>
> The WARN_ON() now comes before the type == -1 test and I hit that at
> *very* high frequency when trying to test device assignment. Restoring
> the ordering to what Xiao originally proposed resolves the problem.
> Thanks,
And I remember testing the change and seeing the warning. So, in short,
I screwed up. Probably I tested on one machine and pushed from another. :/
Paolo
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