[PATCH v3 18/22] powerpc/kuap: Wire-up KUAP on 44x
From: Christophe Leroy <hidden>
Date: 2021-10-19 07:31:38
Also in:
lkml
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Michael Ellerman, Linus Torvalds
This adds KUAP support to 44x. This is done by checking the content of SPRN_PID at the time it is read and written into SPRN_MMUCR. Signed-off-by: Christophe Leroy <redacted> --- arch/powerpc/kernel/head_44x.S | 16 ++++++++++++++++ arch/powerpc/platforms/Kconfig.cputype | 1 + 2 files changed, 17 insertions(+)
diff --git a/arch/powerpc/kernel/head_44x.S b/arch/powerpc/kernel/head_44x.S
index 916f7e91c6de..b73a56466903 100644
--- a/arch/powerpc/kernel/head_44x.S
+++ b/arch/powerpc/kernel/head_44x.S@@ -334,6 +334,10 @@ interrupt_base: mfspr r12,SPRN_MMUCR mfspr r13,SPRN_PID /* Get PID */ rlwimi r12,r13,0,24,31 /* Set TID */ +#ifdef CONFIG_PPC_KUAP + cmpwi r13,0 + beq 2f /* KUAP Fault */ +#endif 4: mtspr SPRN_MMUCR,r12
@@ -444,6 +448,10 @@ interrupt_base: mfspr r12,SPRN_MMUCR mfspr r13,SPRN_PID /* Get PID */ rlwimi r12,r13,0,24,31 /* Set TID */ +#ifdef CONFIG_PPC_KUAP + cmpwi r13,0 + beq 2f /* KUAP Fault */ +#endif 4: mtspr SPRN_MMUCR,r12
@@ -572,6 +580,10 @@ finish_tlb_load_44x: 3: mfspr r11,SPRN_SPRG3 lwz r11,PGDIR(r11) mfspr r12,SPRN_PID /* Get PID */ +#ifdef CONFIG_PPC_KUAP + cmpwi r12,0 + beq 2f /* KUAP Fault */ +#endif 4: mtspr SPRN_MMUCR,r12 /* Set MMUCR */ /* Mask of required permission bits. Note that while we
@@ -669,6 +681,10 @@ finish_tlb_load_44x: 3: mfspr r11,SPRN_SPRG_THREAD lwz r11,PGDIR(r11) mfspr r12,SPRN_PID /* Get PID */ +#ifdef CONFIG_PPC_KUAP + cmpwi r12,0 + beq 2f /* KUAP Fault */ +#endif 4: mtspr SPRN_MMUCR,r12 /* Set MMUCR */ /* Make up the required permissions */
diff --git a/arch/powerpc/platforms/Kconfig.cputype b/arch/powerpc/platforms/Kconfig.cputype
index fad34f28bd3a..e989eeca4c7e 100644
--- a/arch/powerpc/platforms/Kconfig.cputype
+++ b/arch/powerpc/platforms/Kconfig.cputype@@ -64,6 +64,7 @@ config 44x select PHYS_64BIT select PPC_HAVE_KUEP select PPC_KUEP + select PPC_HAVE_KUAP endchoice
--
2.31.1