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[2620:137:e000::1:20]) by mx.google.com with ESMTP id bu16-20020a632950000000b0054fe7642adesi9217324pgb.790.2023.07.24.06.34.05; Mon, 24 Jul 2023 06:34:19 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@kernel.org header.s=k20201202 header.b=g5luj1Fm; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231295AbjGXMuM (ORCPT + 99 others); Mon, 24 Jul 2023 08:50:12 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38214 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230447AbjGXMtk (ORCPT ); Mon, 24 Jul 2023 08:49:40 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8A2C9199F; Mon, 24 Jul 2023 05:48:24 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (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 dfw.source.kernel.org (Postfix) with ESMTPS id 6B86161158; Mon, 24 Jul 2023 12:48:24 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id E8046C43215; Mon, 24 Jul 2023 12:48:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1690202903; bh=9XX9E5bnVFdIImff20pSxEMqbLIiek/DMAIXfYv+R4o=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=g5luj1FmydDH077cQIwSyyoHieIwMfmKCK/e93g5iEwilx9smr8BVk1w6xeaL+6mA Q1GRl3c4ApcUsR4GkPHzK7b5whWMHkhcaoBr9sjiEt0zR6k8EsWy15b6rqPOq6LW1q EzNSZgSqvyPU9yuwVH/92zLXDowX8R5WCYIDRtybva1+73HnIBMj0sbWg8Ix+4ND7L tWubSRJhCfudxBLr+mvqx6KQWFxA0XX0TyMnnSn7Pjic+phNSmcJr6AP5y3Dtom/66 XofRC+1mVVQIFKX3T7AsWQletZUCN5ZP8uQsu/3w+mBciZlIcp96AQ9JvJt4yvzC0o WXYL5cpKvNHSg== From: Mark Brown Date: Mon, 24 Jul 2023 13:46:00 +0100 Subject: [PATCH v2 13/35] arm64/el2_setup: Allow GCS usage at EL0 and EL1 MIME-Version: 1.0 Message-Id: <20230724-arm64-gcs-v2-13-dc2c1d44c2eb@kernel.org> References: <20230724-arm64-gcs-v2-0-dc2c1d44c2eb@kernel.org> In-Reply-To: <20230724-arm64-gcs-v2-0-dc2c1d44c2eb@kernel.org> To: Catalin Marinas , Will Deacon , Jonathan Corbet , Andrew Morton , Marc Zyngier , Oliver Upton , James Morse , Suzuki K Poulose , Arnd Bergmann , Oleg Nesterov , Eric Biederman , Kees Cook , Shuah Khan , "Rick P. Edgecombe" , Deepak Gupta , Ard Biesheuvel , Szabolcs Nagy Cc: "H.J. Lu" , Paul Walmsley , Palmer Dabbelt , Albert Ou , linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, kvmarm@lists.linux.dev, linux-fsdevel@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, Mark Brown X-Mailer: b4 0.13-dev-099c9 X-Developer-Signature: v=1; a=openpgp-sha256; l=1466; i=broonie@kernel.org; h=from:subject:message-id; bh=9XX9E5bnVFdIImff20pSxEMqbLIiek/DMAIXfYv+R4o=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBkvnKTRmQLErEFRBBYg+Wbp1aqvIROIrxg58PycEEj 0Ca8O2uJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCZL5ykwAKCRAk1otyXVSH0PeWB/ 43JSGiLX6LknAkLSD0zagOZzi4Y1yVo7nGNH51v7xJ7whHCsfvpoJNdIpvQGPh45crFz//2hx4t1fC BYKaQhm3AjI7TftskMYTu7Zp0PomNd9+8vxQ40d4MXiN0n4s/3EenpAm0P+dHOhzbsvlgftw0G/snF F/BkDxmVhH9JwOsIzECiA/+/WlS3QCsQHozivU2FJcJMbp1+1b5YIAKbqOjudCE7TiYTn/67OYXX10 7Znmss95RUIGq5jrXZqJrlETZfMgTOyqrm2yCaqz/+elkAV+/9+H52fF264XY2aV0HYdKAU09IUDz/ 7rT8PWTrrne0LMXoQ/8PvFeFVSRFKK X-Developer-Key: i=broonie@kernel.org; a=openpgp; fpr=3F2568AAC26998F9E813A1C5C3F436CA30F5D8EB X-Spam-Status: No, score=-7.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_HI, SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1772309088979332737 X-GMAIL-MSGID: 1772309088979332737 There is a control HCRX_EL2.GCSEn which must be set to allow GCS features to take effect at lower ELs and also fine grained traps for GCS usage at EL0 and EL1. Configure all these to allow GCS usage by EL0 and EL1. Signed-off-by: Mark Brown --- arch/arm64/include/asm/el2_setup.h | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/arch/arm64/include/asm/el2_setup.h b/arch/arm64/include/asm/el2_setup.h index 8e5ffb58f83e..45f3a7dcfd95 100644 --- a/arch/arm64/include/asm/el2_setup.h +++ b/arch/arm64/include/asm/el2_setup.h @@ -27,6 +27,14 @@ ubfx x0, x0, #ID_AA64MMFR1_EL1_HCX_SHIFT, #4 cbz x0, .Lskip_hcrx_\@ mov_q x0, HCRX_HOST_FLAGS + + /* Enable GCS if supported */ + mrs_s x1, SYS_ID_AA64PFR1_EL1 + ubfx x1, x1, #ID_AA64PFR1_EL1_GCS_SHIFT, #4 + cbz x1, .Lset_hcrx_\@ + orr x0, x0, #HCRX_EL2_GCSEn + +.Lset_hcrx_\@: msr_s SYS_HCRX_EL2, x0 .Lskip_hcrx_\@: .endm @@ -186,6 +194,15 @@ orr x0, x0, #HFGxTR_EL2_nPIR_EL1 orr x0, x0, #HFGxTR_EL2_nPIRE0_EL1 + /* GCS depends on PIE so we don't check it if PIE is absent */ + mrs_s x1, SYS_ID_AA64PFR1_EL1 + ubfx x1, x1, #ID_AA64PFR1_EL1_GCS_SHIFT, #4 + cbz x1, .Lset_fgt_\@ + + /* Disable traps of access to GCS registers at EL0 and EL1 */ + orr x0, x0, #HFGxTR_EL2_nGCS_EL1_MASK + orr x0, x0, #HFGxTR_EL2_nGCS_EL0_MASK + .Lset_fgt_\@: msr_s SYS_HFGRTR_EL2, x0 msr_s SYS_HFGWTR_EL2, x0