arm64: mm: Use non-global mappings for kernel space

Browse source

Commit e046eb0c9b upstream.

In preparation for unmapping the kernel whilst running in userspace,
make the kernel mappings non-global so we can avoid expensive TLB
invalidation on kernel exit to userspace.

Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Tested-by: Laura Abbott <labbott@redhat.com>
Tested-by: Shanker Donthineni <shankerd@codeaurora.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

This commit is contained in:

Will Deacon 2017-08-10 12:56:18 +01:00 • committed by Greg Kroah-Hartman

parent 63380839c5

commit 78299fafcd

2 changed files with 25 additions and 8 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

12

arch/arm64/include/asm/kernel-pgtable.h

View file

21

arch/arm64/include/asm/pgtable-prot.h

View file