diff mbox series

[v1,12/15] powerpc/kuap: Wire-up KUAP on 40x

Message ID 21fba0d5addd3ec1f90d742c21b86dabc208fc32.1633523837.git.christophe.leroy@csgroup.eu (mailing list archive)
State Superseded
Headers show
Series powerpc: Add KUAP support for BOOKE and 40x | expand
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Commit Message

Christophe Leroy Oct. 6, 2021, 12:43 p.m. UTC 
This adds KUAP support to 40x. This is done by checking
the content of SPRN_PID at the time user pgtable is loaded.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
---
 arch/powerpc/kernel/head_40x.S         | 8 ++++++++
 arch/powerpc/platforms/Kconfig.cputype | 1 +
 2 files changed, 9 insertions(+)
diff mbox series

Patch

diff --git a/arch/powerpc/kernel/head_40x.S b/arch/powerpc/kernel/head_40x.S
index 7d72ee5ab387..87d322dbed94 100644
--- a/arch/powerpc/kernel/head_40x.S
+++ b/arch/powerpc/kernel/head_40x.S
@@ -297,6 +297,10 @@  _ASM_NOKPROBE_SYMBOL(\name\()_virt)
 3:
 	mfspr	r11,SPRN_SPRG_THREAD
 	lwz	r11,PGDIR(r11)
+#ifdef CONFIG_PPC_KUAP
+	rlwinm.	r9, r9, 0, 0xff
+	beq	5f			/* Kuap fault */
+#endif
 4:
 	tophys(r11, r11)
 	rlwimi	r11, r10, 12, 20, 29	/* Create L1 (pgdir/pmd) address */
@@ -377,6 +381,10 @@  _ASM_NOKPROBE_SYMBOL(\name\()_virt)
 3:
 	mfspr	r11,SPRN_SPRG_THREAD
 	lwz	r11,PGDIR(r11)
+#ifdef CONFIG_PPC_KUAP
+	rlwinm.	r9, r9, 0, 0xff
+	beq	5f			/* Kuap fault */
+#endif
 4:
 	tophys(r11, r11)
 	rlwimi	r11, r10, 12, 20, 29	/* Create L1 (pgdir/pmd) address */
diff --git a/arch/powerpc/platforms/Kconfig.cputype b/arch/powerpc/platforms/Kconfig.cputype
index 74e5887abbce..3fdc10bc4aab 100644
--- a/arch/powerpc/platforms/Kconfig.cputype
+++ b/arch/powerpc/platforms/Kconfig.cputype
@@ -53,6 +53,7 @@  config 40x
 	select PPC_UDBG_16550
 	select 4xx_SOC
 	select HAVE_PCI
+	select PPC_HAVE_KUAP
 
 config 44x
 	bool "AMCC 44x, 46x or 47x"