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[PATCH 4.9 147/153] powerpc/mm/hash: Always clear UPRT and Host Radix bits when setting up CPU

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  [PATCH 4.9 147/153] powerpc/mm/hash: Always clear UPRT and Host Radix bits when setting up CPU Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-03-10 10:30 +0100

#1596797 — [PATCH 4.9 147/153] powerpc/mm/hash: Always clear UPRT and Host Radix bits when setting up CPU

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

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

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

commit fda2d27db6eae5c2468f9e4657539b72bbc238bb upstream.

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")
Acked-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/powerpc/kernel/cpu_setup_power.S |    4 ++++
 1 file changed, 4 insertions(+)

--- a/arch/powerpc/kernel/cpu_setup_power.S
+++ b/arch/powerpc/kernel/cpu_setup_power.S
@@ -100,6 +100,8 @@ _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
@@ -120,6 +122,8 @@ _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

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