[PATCH] KVM: arm64: Retry fault if vma_lookup() results become invalid

[Oliver Upton]

On Mon, 13 Mar 2023 16:54:54 -0700, David Matlack wrote:
> Read mmu_invalidate_seq before dropping the mmap_lock so that KVM can
> detect if the results of vma_lookup() (e.g. vma_shift) become stale
> before it acquires kvm->mmu_lock. This fixes a theoretical bug where a
> VMA could be changed by userspace after vma_lookup() and before KVM
> reads the mmu_invalidate_seq, causing KVM to install page table entries
> based on a (possibly) no-longer-valid vma_shift.
> 
> [...]

Applied to kvmarm/fixes, thanks!

[1/1] KVM: arm64: Retry fault if vma_lookup() results become invalid
      https://git.kernel.org/kvmarm/kvmarm/c/13ec9308a857

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Best,
Oliver