Punit Agrawal 1d0bd8c923 KVM: arm/arm64: Skip updating PTE entry if no change ...

commit 976d34e2da upstream.

When there is contention on faulting in a particular page table entry
at stage 2, the break-before-make requirement of the architecture can
lead to additional refaulting due to TLB invalidation.

Avoid this by skipping a page table update if the new value of the PTE
matches the previous value.

Cc: stable@vger.kernel.org
Fixes: d5d8184d35 ("KVM: ARM: Memory virtualization setup")
Reviewed-by: Suzuki Poulose <suzuki.poulose@arm.com>
Acked-by: Christoffer Dall <christoffer.dall@arm.com>
Signed-off-by: Punit Agrawal <punit.agrawal@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2018-09-05 09:29:43 +02:00

..

kvm

KVM: arm/arm64: Skip updating PTE entry if no change

2018-09-05 09:29:43 +02:00

lib

KVM: eventfd: fix NULL deref irqbypass consumer

2017-01-12 14:42:34 +01:00

Makefile

virt: Add virt directory to the top Makefile

2015-10-01 15:06:44 +02:00