Anthony Liguori wrote:
> This patch allows VMA's that contain no backing page to be used for guest
> memory. This is a drop-in replacement for Ben-Ami's first page in his direct
> mmio series. Here, we continue to allow mmio pages to be represented in the
> rmap.
>
>
I like this very much, as it only affects accessors and not the mmu core
itself.
Hollis/Xiantao/Carsten, can you confirm that this approach works for
you? Carsten, I believe you don't have mmio, but at least this
shouldn't interfere.
>
> struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
> {
> - return pfn_to_page(gfn_to_pfn(kvm, gfn));
> + pfn_t pfn;
> +
> + pfn = gfn_to_pfn(kvm, gfn);
> + if (pfn_valid(pfn))
> + return pfn_to_page(pfn);
> +
> + return NULL;
> }
>
You're returning NULL here, not bad_page.
--
Any sufficiently difficult bug is indistinguishable from a feature.
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