On Tue, 27 Jun 2023 23:54:05 +0000, Oliver Upton wrote:
> Userspace is allowed to select any PAGE_SIZE aligned hva to back guest
> memory. This is even the case with hugepages, although it is a rather
> suboptimal configuration as PTE level mappings are used at stage-2.
>
> The arm64 page aging handlers have an assumption that the specified
> range is exactly one page/block of memory, which in the aforementioned
> case is not necessarily true. All together this leads to the WARN() in
> kvm_age_gfn() firing.
>
> [...]
Applied to kvmarm/fixes, with Marc's suggestion to add a comment around the
-EAGAIN path to indicate it is impossible while holding the MMU lock for write.
[1/1] KVM: arm64: Correctly handle page aging notifiers for unaligned memslot
https://git.kernel.org/kvmarm/kvmarm/c/df6556adf27b
--
Best,
Oliver
