From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from ozlabs.org (ozlabs.org [IPv6:2401:3900:2:1::2]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 3t7XQx61zkzDt31 for ; Wed, 2 Nov 2016 00:39:53 +1100 (AEDT) Received: from mail-pf0-x244.google.com (mail-pf0-x244.google.com [IPv6:2607:f8b0:400e:c00::244]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 3t7XQw72Sdz9t0q for ; Wed, 2 Nov 2016 00:39:52 +1100 (AEDT) Received: by mail-pf0-x244.google.com with SMTP id y68so5866471pfb.1 for ; Tue, 01 Nov 2016 06:39:52 -0700 (PDT) From: Balbir Singh To: linuxppc-dev , Michael Ellerman Subject: [PATCH 1/3] Setup AMOR in HV mode Date: Wed, 2 Nov 2016 00:38:18 +1100 Message-Id: <1478007500-23624-2-git-send-email-bsingharora@gmail.com> In-Reply-To: <1478007500-23624-1-git-send-email-bsingharora@gmail.com> References: <1478007500-23624-1-git-send-email-bsingharora@gmail.com> List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , AMOR should be setup in HV mode, we set it up once and let the generic kernel handle IAMR. This patch is used to enable storage keys in a following patch as defined in ISA 3 Reported-by: Aneesh Kumar K.V Signed-off-by: Balbir Singh --- arch/powerpc/mm/pgtable-radix.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/arch/powerpc/mm/pgtable-radix.c b/arch/powerpc/mm/pgtable-radix.c index ed7bddc..0fdd8ed 100644 --- a/arch/powerpc/mm/pgtable-radix.c +++ b/arch/powerpc/mm/pgtable-radix.c @@ -320,6 +320,25 @@ static void update_hid_for_radix(void) cpu_relax(); } +/* + * In HV mode, we init AMOR so that the hypervisor + * and guest can setup IMAR, enable key 0 and set + * it to 1 + * AMOR = 1100....00 (Mask for key 0 is 11) + */ +static void __init radix_init_amor(void) +{ + unsigned long amor_mask = 0xc000000000000000; + unsigned long amor = mfspr(SPRN_AMOR); + + if (cpu_has_feature(CPU_FTR_POWER9_DD1)) + return; + + amor |= amor_mask; + + mtspr(SPRN_AMOR, amor); +} + void __init radix__early_init_mmu(void) { unsigned long lpcr; @@ -376,6 +395,7 @@ void __init radix__early_init_mmu(void) lpcr = mfspr(SPRN_LPCR); mtspr(SPRN_LPCR, lpcr | LPCR_UPRT | LPCR_HR); radix_init_partition_table(); + radix_init_amor(); } radix_init_pgtable(); -- 2.5.5