Christophe Leroy
ee2631603f
powerpc/44x: Activate KUEP at all time
...
On 44x, KUEP is implemented by clearing SX bit during TLB miss
for user pages. The impact is minimal and not worth neither
boot time nor build time selection.
Activate it at all time.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu >
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au >
Link: https://lore.kernel.org/r/2414d662558e7fb27d1ed41c8e47c591d576acac.1634627931.git.christophe.leroy@csgroup.eu
2021-12-09 22:41:17 +11:00
Christophe Leroy
10248dcba1
powerpc/44x: Implement Kernel Userspace Exec Protection (KUEP)
...
Powerpc 44x has two bits for exec protection in TLBs: one
for user (UX) and one for superviser (SX).
Clear SX on user pages in TLB miss handlers to provide KUEP.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu >
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au >
Link: https://lore.kernel.org/r/169310e08152aa1d96c979770291d165ec6896ae.1622616032.git.christophe.leroy@csgroup.eu
2021-06-17 00:09:07 +10:00
Christophe Leroy
c102f07667
powerpc/vdso: Replace vdso_base by vdso
...
All other architectures but s390 use a void pointer named 'vdso'
to reference the VDSO mapping.
In a following patch, the VDSO data page will be put in front of
text, vdso_base will then not anymore point to VDSO text.
To avoid confusion between vdso_base and VDSO text, rename vdso_base
into vdso and make it a void __user *.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu >
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au >
Link: https://lore.kernel.org/r/8e6cefe474aa4ceba028abb729485cd46c140990.1601197618.git.christophe.leroy@csgroup.eu
2020-12-04 01:01:16 +11:00
Christophe Leroy
6c16816b91
powerpc/44x: use patch_sites for TLB handlers patching
...
Use patch sites and associated helpers to manage TLB handlers
patching instead of hardcoding.
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr >
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au >
2018-12-19 18:56:32 +11:00
Christophe Leroy
994da93d19
powerpc/mm: move platform specific mmu-xxx.h in platform directories
...
The purpose of this patch is to move platform specific
mmu-xxx.h files in platform directories like pte-xxx.h files.
In the meantime this patch creates common nohash and
nohash/32 + nohash/64 mmu.h files for future common parts.
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com >
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr >
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au >
2018-12-04 19:45:01 +11:00
