Messages in this thread | | | Date | Mon, 24 Aug 2020 18:16:50 +0200 | From | Greg KH <> | Subject | Re: [PATCH stable-4.4.y backport] KVM: arm/arm64: Don't reschedule in unmap_stage2_range() |
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On Mon, Aug 24, 2020 at 12:28:54PM +0100, Will Deacon wrote: > Upstream commits fdfe7cbd5880 ("KVM: Pass MMU notifier range flags to > kvm_unmap_hva_range()") and b5331379bc62 ("KVM: arm64: Only reschedule > if MMU_NOTIFIER_RANGE_BLOCKABLE is not set") fix a "sleeping from invalid > context" BUG caused by unmap_stage2_range() attempting to reschedule when > called on the OOM path. > > Unfortunately, these patches rely on the MMU notifier callback being > passed knowledge about whether or not blocking is permitted, which was > introduced in 4.19. Rather than backport this considerable amount of > infrastructure just for KVM on arm, instead just remove the conditional > reschedule. > > Cc: <stable@vger.kernel.org> # v4.4 only > Cc: Marc Zyngier <maz@kernel.org> > Cc: Suzuki K Poulose <suzuki.poulose@arm.com> > Cc: James Morse <james.morse@arm.com> > Signed-off-by: Will Deacon <will@kernel.org>
Thanks for tall the backports, now queued up.
greg k-h
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