diff options
| author | Punit Agrawal <punit.agrawal@arm.com> | 2018-08-13 11:43:51 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-09-05 09:18:38 +0200 |
| commit | 24fa4a211e2655ba71f0da7e351475bb8f752e93 (patch) | |
| tree | 6d1bfc0c52b369253ba32b7774c698d6341b43a0 /crypto/crypto_null.c | |
| parent | 355cccb6593f87329940d411894bd9de30286b97 (diff) | |
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 'crypto/crypto_null.c')
0 files changed, 0 insertions, 0 deletions