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From: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
To: benh@kernel.crashing.org, paulus@samba.org, mpe@ellerman.id.au
Cc: linuxppc-dev@lists.ozlabs.org,
	"Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Subject: [PATCH] powerpc/mm/hash: Always clear UPRT and Host Radix bits when setting up CPU
Date: Wed, 22 Feb 2017 10:42:02 +0530	[thread overview]
Message-ID: <1487740322-17755-1-git-send-email-aneesh.kumar@linux.vnet.ibm.com> (raw)

We will set LPCR with correct value for radix during int. This make sure we
start with a sanitized value of LPCR. In case of kexec, cpus can have LPCR
value based on the previous translation mode we were running.

Fixes: fe036a0605d60 ("powerpc/64/kexec: Fix MMU cleanup on radix")
Cc: stable@vger.kernel.org # v4.9+
Acked-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
---
 arch/powerpc/kernel/cpu_setup_power.S | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/powerpc/kernel/cpu_setup_power.S b/arch/powerpc/kernel/cpu_setup_power.S
index 917188615bf5..7fe8c79e6937 100644
--- a/arch/powerpc/kernel/cpu_setup_power.S
+++ b/arch/powerpc/kernel/cpu_setup_power.S
@@ -101,6 +101,8 @@ _GLOBAL(__setup_cpu_power9)
 	mfspr	r3,SPRN_LPCR
 	LOAD_REG_IMMEDIATE(r4, LPCR_PECEDH | LPCR_PECE_HVEE | LPCR_HVICE)
 	or	r3, r3, r4
+	LOAD_REG_IMMEDIATE(r4, LPCR_UPRT | LPCR_HR)
+	andc	r3, r3, r4
 	bl	__init_LPCR
 	bl	__init_HFSCR
 	bl	__init_tlb_power9
@@ -122,6 +124,8 @@ _GLOBAL(__restore_cpu_power9)
 	mfspr   r3,SPRN_LPCR
 	LOAD_REG_IMMEDIATE(r4, LPCR_PECEDH | LPCR_PECE_HVEE | LPCR_HVICE)
 	or	r3, r3, r4
+	LOAD_REG_IMMEDIATE(r4, LPCR_UPRT | LPCR_HR)
+	andc	r3, r3, r4
 	bl	__init_LPCR
 	bl	__init_HFSCR
 	bl	__init_tlb_power9
-- 
2.7.4

             reply	other threads:[~2017-02-22  5:12 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-02-22  5:12 Aneesh Kumar K.V [this message]
2017-02-22  6:16 ` [PATCH] powerpc/mm/hash: Always clear UPRT and Host Radix bits when setting up CPU Balbir Singh
2017-02-22  6:23   ` Aneesh Kumar K.V
2017-02-22  6:24 ` Balbir Singh
2017-02-22  6:40   ` Aneesh Kumar K.V
2017-02-22 21:28 ` Michael Ellerman
2017-02-27 10:11 ` Michael Ellerman

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