From 269e829f48a0d0d27667abe25ca5c9e5b6ab08e2 Mon Sep 17 00:00:00 2001 From: "Aneesh Kumar K.V" Date: Sun, 26 Jul 2020 18:55:17 +0530 Subject: [PATCH] powerpc/book3s64/pkey: Disable pkey on POWER6 and before POWER6 only supports AMR update via privileged mode (MSR[PR] = 0, SPRN_AMR=29) The PR=1 (userspace) alias for that SPR (SPRN_AMR=13) was only supported from POWER7. Since we don't allow userspace modifying of AMR value we should disable pkey support on P6 and before. The hypervisor will still report pkey support via "ibm,processor-storage-keys". Hence also check for P7 CPU_FTR bit to decide on pkey support. Fixes: f491fe3fb41e ("powerpc/book3s64/pkeys: Simplify the key initialization") Reported-by: Michael Ellerman Signed-off-by: Aneesh Kumar K.V Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20200726132517.399076-1-aneesh.kumar@linux.ibm.com --- arch/powerpc/mm/book3s64/pkeys.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/powerpc/mm/book3s64/pkeys.c b/arch/powerpc/mm/book3s64/pkeys.c index 792b36aa9619..69a6b87f2bb4 100644 --- a/arch/powerpc/mm/book3s64/pkeys.c +++ b/arch/powerpc/mm/book3s64/pkeys.c @@ -73,6 +73,12 @@ static int scan_pkey_feature(void) if (early_radix_enabled()) return 0; + /* + * Only P7 and above supports SPRN_AMR update with MSR[PR] = 1 + */ + if (!early_cpu_has_feature(CPU_FTR_ARCH_206)) + return 0; + ret = of_scan_flat_dt(dt_scan_storage_keys, &pkeys_total); if (ret == 0) { /* -- 2.25.1