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| author |   Christophe Leroy <christophe.leroy@csgroup.eu> | 2021-10-19 09:29:14 +0200 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2021-12-09 22:41:17 +1100 |
| commit | ee2631603fdbab6f76e86ea87f7a03ebc3a1ef85 (patch) | |
| tree | ced744dfae078e06f100c6f381e4e7989263f6d1 /arch/powerpc/kernel/head_44x.S | |
| parent | powerpc/8xx: Activate KUEP at all time (diff) | |
| download | linux-dev-ee2631603fdbab6f76e86ea87f7a03ebc3a1ef85.tar.xz linux-dev-ee2631603fdbab6f76e86ea87f7a03ebc3a1ef85.zip | |
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
Diffstat (limited to 'arch/powerpc/kernel/head_44x.S')
| -rw-r--r-- | arch/powerpc/kernel/head_44x.S | 10 |
1 files changed, 2 insertions, 8 deletions
diff --git a/arch/powerpc/kernel/head_44x.S b/arch/powerpc/kernel/head_44x.S index 02d2928d1e01..916f7e91c6de 100644 --- a/arch/powerpc/kernel/head_44x.S +++ b/arch/powerpc/kernel/head_44x.S @@ -532,10 +532,7 @@ finish_tlb_load_44x: andi. r10,r12,_PAGE_USER /* User page ? */ beq 1f /* nope, leave U bits empty */ rlwimi r11,r11,3,26,28 /* yes, copy S bits to U */ -#ifdef CONFIG_PPC_KUEP -0: rlwinm r11,r11,0,~PPC44x_TLB_SX /* Clear SX if User page */ - patch_site 0b, patch__tlb_44x_kuep -#endif + rlwinm r11,r11,0,~PPC44x_TLB_SX /* Clear SX if User page */ 1: tlbwe r11,r13,PPC44x_TLB_ATTRIB /* Write ATTRIB */ /* Done...restore registers and get out of here. @@ -747,10 +744,7 @@ finish_tlb_load_47x: andi. r10,r12,_PAGE_USER /* User page ? */ beq 1f /* nope, leave U bits empty */ rlwimi r11,r11,3,26,28 /* yes, copy S bits to U */ -#ifdef CONFIG_PPC_KUEP -0: rlwinm r11,r11,0,~PPC47x_TLB2_SX /* Clear SX if User page */ - patch_site 0b, patch__tlb_47x_kuep -#endif + rlwinm r11,r11,0,~PPC47x_TLB2_SX /* Clear SX if User page */ 1: tlbwe r11,r13,2 /* Done...restore registers and get out of here. |