linux-kernel - [PATCH 4.16 059/196] powerpc/64s: Fix pkey support in dt_cpu_ftrs, add CPU_FTR

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Date:   Sun, 22 Apr 2018 15:51:19 +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>,
        Nicholas Piggin <npiggin@...il.com>,
        Michael Ellerman <mpe@...erman.id.au>
Subject: [PATCH 4.16 059/196] powerpc/64s: Fix pkey support in dt_cpu_ftrs, add CPU_FTR_PKEY bit

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

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

From: Nicholas Piggin <npiggin@...il.com>

commit c130153e453cba0f37ad10fa18a1aa9c9a598a59 upstream.

The pkey code added a CPU_FTR_PKEY bit, but did not add it to the
dt_cpu_ftrs feature set. Although capability is supported by all
processors in the base dt_cpu_ftrs set for 64s, it's a significant
and sufficiently well defined feature to make it optional. So add
it as a quirk for now, which can be versioned out then controlled
by the firmware (once dt_cpu_ftrs gains versioning support).

Fixes: cf43d3b26452 ("powerpc: Enable pkey subsystem")
Cc: stable@...r.kernel.org # v4.16+
Cc: Ram Pai <linuxram@...ibm.com>
Signed-off-by: Nicholas Piggin <npiggin@...il.com>
Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/powerpc/kernel/dt_cpu_ftrs.c |    7 +++++++
 1 file changed, 7 insertions(+)

--- a/arch/powerpc/kernel/dt_cpu_ftrs.c
+++ b/arch/powerpc/kernel/dt_cpu_ftrs.c
@@ -658,6 +658,13 @@ static void __init cpufeatures_setup_sta
 		cur_cpu_spec->cpu_features |= CPU_FTR_ARCH_300;
 		cur_cpu_spec->cpu_user_features2 |= PPC_FEATURE2_ARCH_3_00;
 	}
+
+	/*
+	 * PKEY was not in the initial base or feature node
+	 * specification, but it should become optional in the next
+	 * cpu feature version sequence.
+	 */
+	cur_cpu_spec->cpu_features |= CPU_FTR_PKEY;
 }
 
 static bool __init cpufeatures_process_feature(struct dt_cpu_feature *f)