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

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

-- Best, Oliver