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| author | Punit Agrawal <punit.agrawal@arm.com> | 2018-08-13 11:43:51 +0100 |
|---|---|---|
| committer | Marc Zyngier <marc.zyngier@arm.com> | 2018-08-13 15:32:01 +0100 |
| commit | 976d34e2dab10ece5ea8fe7090b7692913f89084 (patch) | |
| tree | 116675a97ba2812fccb4aec6119786eb2b452b1d /virt/kvm/arm/arm.c | |
| parent | 86658b819cd0a9aa584cd84453ed268a6f013770 (diff) | |
| download | linux-976d34e2dab10ece5ea8fe7090b7692913f89084.tar.gz linux-976d34e2dab10ece5ea8fe7090b7692913f89084.tar.bz2 linux-976d34e2dab10ece5ea8fe7090b7692913f89084.zip | |
KVM: arm/arm64: Skip updating PTE entry if no change
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: d5d8184d35c9 ("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>
Diffstat (limited to 'virt/kvm/arm/arm.c')
0 files changed, 0 insertions, 0 deletions