From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8E144C433DB for ; Wed, 31 Mar 2021 00:41:17 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id C8891619C5 for ; Wed, 31 Mar 2021 00:41:16 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C8891619C5 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=ellerman.id.au Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4F96tz3mhGz3dGZ for ; Wed, 31 Mar 2021 11:41:15 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=ellerman.id.au header.i=@ellerman.id.au header.a=rsa-sha256 header.s=201909 header.b=rAW8B61Z; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=ozlabs.org (client-ip=2401:3900:2:1::2; helo=ozlabs.org; envelope-from=michael@ozlabs.org; receiver=) Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=ellerman.id.au header.i=@ellerman.id.au header.a=rsa-sha256 header.s=201909 header.b=rAW8B61Z; dkim-atps=neutral Received: from ozlabs.org (bilbo.ozlabs.org [IPv6:2401:3900:2:1::2]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4F96rG4KDXz3btW for ; Wed, 31 Mar 2021 11:38:53 +1100 (AEDT) Received: by ozlabs.org (Postfix, from userid 1034) id 4F96rB2BdCz9sW0; Wed, 31 Mar 2021 11:38:50 +1100 (AEDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ellerman.id.au; s=201909; t=1617151130; bh=99RnwgWYdU01/QUL8pRwYrIC6tmqAiczXkDFESHCLUo=; h=From:To:Subject:Date:In-Reply-To:References:From; b=rAW8B61Z/QbpVe6R8PTokzYVZzV1nB4vHKtXmRuILCZOPXUUpCFvtYCCXgEcTFdvS g39dAF/1SNKkfdb5ZiN8qmlJJPKDLZ+/uEFQQg5LzlYltm9rLZu/ROKnB4LhRVoowJ jqytHU8KipaKtzNBCNKUUqV2f++HnhcoseYSXGn3yuYffk0Ry4TmDDT3FIT0nnOt2M Iq69OVq32xaAqkv1zKlrFbwy1Kwwmvx297UjP7EpMJ4T0gENX55ZbZA8K8u329xmuR DfXd/xmdP9GeYKBlOaN0AqZpMT01S2aBSQinanEsCDIY42wyN8Fbl21eqmOI1lqtdy Y0MVwXhxR0eQw== From: Michael Ellerman To: linuxppc-dev@lists.ozlabs.org Subject: [PATCH v2 2/6] powerpc/pseries: Add key to flags in pSeries_lpar_hpte_updateboltedpp() Date: Wed, 31 Mar 2021 11:38:41 +1100 Message-Id: <20210331003845.216246-2-mpe@ellerman.id.au> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210331003845.216246-1-mpe@ellerman.id.au> References: <20210331003845.216246-1-mpe@ellerman.id.au> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" The flags argument to plpar_pte_protect() (aka. H_PROTECT), includes the key in bits 9-13, but currently we always set those bits to zero. In the past that hasn't been a problem because we always used key 0 for the kernel, and updateboltedpp() is only used for kernel mappings. However since commit d94b827e89dc ("powerpc/book3s64/kuap: Use Key 3 for kernel mapping with hash translation") we are now inadvertently changing the key (to zero) when we call plpar_pte_protect(). That hasn't broken anything because updateboltedpp() is only used for STRICT_KERNEL_RWX, which is currently disabled on 64s due to other bugs. But we want to fix that, so first we need to pass the key correctly to plpar_pte_protect(). We can't pass our newpp value directly in, we have to convert it into the form expected by the hcall. The hcall we're using here is H_PROTECT, which is specified in section 14.5.4.1.6 of LoPAPR v1.1. It takes a `flags` parameter, and the description for flags says: * flags: AVPN, pp0, pp1, pp2, key0-key4, n, and for the CMO option: CMO Option flags as defined in Table 189‚ If you then go to the start of the parent section, 14.5.4.1, on page 405, it says: Register Linkage (For hcall() tokens 0x04 - 0x18) * On Call * R3 function call token * R4 flags (see Table 178‚ “Page Frame Table Access flags field definition‚” on page 401) Then you have to go to section 14.5.3, and on page 394 there is a list of hcalls and their tokens (table 176), and there you can see that H_PROTECT == 0x18. Finally you can look at table 178, on page 401, where it specifies the layout of the bits for the key: Bit Function ----------------- 50-54 | key0-key4 Those are big-endian bit numbers, converting to normal bit numbers you get bits 9-13, or 0x3e00. In the kernel we have: #define HPTE_R_KEY_HI ASM_CONST(0x3000000000000000) #define HPTE_R_KEY_LO ASM_CONST(0x0000000000000e00) So the LO bits of newpp are already in the right place, and the HI bits need to be shifted down by 48. Fixes: d94b827e89dc ("powerpc/book3s64/kuap: Use Key 3 for kernel mapping with hash translation") Signed-off-by: Michael Ellerman --- arch/powerpc/platforms/pseries/lpar.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) v2: Expand change log with explanation of where the format of the flags parameter comes from, prompted by dja. diff --git a/arch/powerpc/platforms/pseries/lpar.c b/arch/powerpc/platforms/pseries/lpar.c index 764170fdb0f7..8bbbddff7226 100644 --- a/arch/powerpc/platforms/pseries/lpar.c +++ b/arch/powerpc/platforms/pseries/lpar.c @@ -976,11 +976,13 @@ static void pSeries_lpar_hpte_updateboltedpp(unsigned long newpp, slot = pSeries_lpar_hpte_find(vpn, psize, ssize); BUG_ON(slot == -1); - flags = newpp & 7; + flags = newpp & (HPTE_R_PP | HPTE_R_N); if (mmu_has_feature(MMU_FTR_KERNEL_RO)) /* Move pp0 into bit 8 (IBM 55) */ flags |= (newpp & HPTE_R_PP0) >> 55; + flags |= ((newpp & HPTE_R_KEY_HI) >> 48) | (newpp & HPTE_R_KEY_LO); + lpar_rc = plpar_pte_protect(flags, slot, 0); BUG_ON(lpar_rc != H_SUCCESS); -- 2.25.1