linux-kernel - [PATCH 4.10 014/129] powerpc/mm: Fixup wrong LPCR

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Date:   Thu, 11 May 2017 16:11:02 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Ram Pai <linuxram@...ibm.com>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
        Jia He <hejianet@...il.com>,
        Paul Mackerras <paulus@...abs.org>,
        Michael Ellerman <mpe@...erman.id.au>
Subject: [PATCH 4.10 014/129] powerpc/mm: Fixup wrong LPCR_VRMASD value

4.10-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>

commit 4ab2537c4204b976e4ca350bbdc193b4649cad28 upstream.

In commit a4b349540a26af ("powerpc/mm: Cleanup LPCR defines") we updated
LPCR_VRMASD wrongly as below.

-#define   LPCR_VRMASD  (0x1ful << (63-16))
+#define   LPCR_VRMASD_SH       47
+#define   LPCR_VRMASD          (ASM_CONST(1) << LPCR_VRMASD_SH)

We initialize the VRMA bits in LPCR to 0x00 in kvm. Hence using a
different mask value as above while updating lpcr should not have any
impact.

This patch updates it to the correct value.

Fixes: a4b349540a26 ("powerpc/mm: Cleanup LPCR defines")
Reported-by: Ram Pai <linuxram@...ibm.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>
Signed-off-by: Jia He <hejianet@...il.com>
Acked-by: Paul Mackerras <paulus@...abs.org>
Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/powerpc/include/asm/reg.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/powerpc/include/asm/reg.h
+++ b/arch/powerpc/include/asm/reg.h
@@ -338,7 +338,7 @@
 #define   LPCR_DPFD_SH		52
 #define   LPCR_DPFD		(ASM_CONST(7) << LPCR_DPFD_SH)
 #define   LPCR_VRMASD_SH	47
-#define   LPCR_VRMASD		(ASM_CONST(1) << LPCR_VRMASD_SH)
+#define   LPCR_VRMASD		(ASM_CONST(0x1f) << LPCR_VRMASD_SH)
 #define   LPCR_VRMA_L		ASM_CONST(0x0008000000000000)
 #define   LPCR_VRMA_LP0		ASM_CONST(0x0001000000000000)
 #define   LPCR_VRMA_LP1		ASM_CONST(0x0000800000000000)