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Will Deacon f99d76865a KVM: arm/arm64: Don't reschedule in unmap_stage2_range()

Upstream commits fdfe7cbd58 ("KVM: Pass MMU notifier range flags to
kvm_unmap_hva_range()") and b5331379bc ("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> # v4.9 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>
Acked-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2023-05-16 08:55:15 +09:00

hyp

ARM: KVM: Add SMCCC_ARCH_WORKAROUND_1 fast handling

2023-05-15 09:33:10 +09:00

arm.c

KVM: arm/arm64: Ensure vcpu target is unset on reset failure

2023-05-15 12:53:30 +09:00

coproc_a7.c

arm/arm64: KVM: Use set/way op trapping to track the state of the caches

2015-01-29 23:24:56 +01:00

coproc_a15.c

arm/arm64: KVM: Use set/way op trapping to track the state of the caches