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| author | Punit Agrawal <punit.agrawal@arm.com> | 2018-08-13 13:43:51 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-09-05 10:26:36 +0300 |
| commit | 4a06fdf2c490666e7e8d2a3c17adfff3f0354441 (patch) | |
| tree | 79cf9dcf49b1af3ef9cf10ce2a99451675a45dcb /arch/s390 | |
| parent | 792a039415dc4562918abff4740ed04c2034f55b (diff) | |
| download | linux-4a06fdf2c490666e7e8d2a3c17adfff3f0354441.tar.xz | |
KVM: arm/arm64: Skip updating PTE entry if no change
commit 976d34e2dab10ece5ea8fe7090b7692913f89084 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: 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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/s390')
0 files changed, 0 insertions, 0 deletions