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From: Christophe Leroy <christophe.leroy@c-s.fr>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Paul Mackerras <paulus@samba.org>,
	Michael Ellerman <mpe@ellerman.id.au>
Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org
Subject: [PATCH RESEND with Fixes: tag] powerpc/chrp: Fix enter_rtas() with CONFIG_VMAP_STACK
Date: Fri, 14 Feb 2020 08:39:50 +0000 (UTC)	[thread overview]
Message-ID: <d2330584f8c42d3039896e2b56f5d39676dc919c.1581669558.git.christophe.leroy@c-s.fr> (raw)

With CONFIG_VMAP_STACK, data MMU has to be enabled
to read data on the stack.

Fixes: cd08f109e262 ("powerpc/32s: Enable CONFIG_VMAP_STACK")
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
---
 arch/powerpc/kernel/entry_32.S | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S
index 0713daa651d9..bc056d906b51 100644
--- a/arch/powerpc/kernel/entry_32.S
+++ b/arch/powerpc/kernel/entry_32.S
@@ -1354,12 +1354,17 @@ _GLOBAL(enter_rtas)
 	mtspr	SPRN_SRR0,r8
 	mtspr	SPRN_SRR1,r9
 	RFI
-1:	tophys(r9,r1)
+1:	tophys_novmstack r9, r1
+#ifdef CONFIG_VMAP_STACK
+	li	r0, MSR_KERNEL & ~MSR_IR	/* can take DTLB miss */
+	mtmsr	r0
+	isync
+#endif
 	lwz	r8,INT_FRAME_SIZE+4(r9)	/* get return address */
 	lwz	r9,8(r9)	/* original msr value */
 	addi	r1,r1,INT_FRAME_SIZE
 	li	r0,0
-	tophys(r7, r2)
+	tophys_novmstack r7, r2
 	stw	r0, THREAD + RTAS_SP(r7)
 	mtspr	SPRN_SRR0,r8
 	mtspr	SPRN_SRR1,r9
-- 
2.25.0


             reply	other threads:[~2020-02-14  8:41 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-14  8:39 Christophe Leroy [this message]
2020-02-19 12:40 ` [PATCH RESEND with Fixes: tag] powerpc/chrp: Fix enter_rtas() with CONFIG_VMAP_STACK Michael Ellerman

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