From patchwork Mon Aug 7 22:00:18 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 13345111 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id E7054C04FE0 for ; Mon, 7 Aug 2023 22:04:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231225AbjHGWEO (ORCPT ); Mon, 7 Aug 2023 18:04:14 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42796 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230267AbjHGWDq (ORCPT ); Mon, 7 Aug 2023 18:03:46 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D89C5E53; Mon, 7 Aug 2023 15:02:52 -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 68D70622B1; Mon, 7 Aug 2023 22:02:52 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1F93EC43395; Mon, 7 Aug 2023 22:02:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1691445771; bh=S97P7xSs7G2VtUJIV0J+B0XZVXkpwW1tCMSo+ZYUeDw=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=LmByAeAoBQ6Sp+qeln7IRkPK8b8wrlI6vP0ofLetjqcYdI6c9SbhWyBuSYq2RoSwN 3JO0aAXKdoRD23voxo/lqdNaqV57fxooeda4xnKjr+wxZMXRxhLSwT+Hbj5gtWUnjx jcnvujnN9lwpXcPbHCmcgom37ArWn78GbgkBNUaTWEcASiIxCK5juxR+QU6y+Kc2Ie ODoPlpYmz279tMnFraV0cvT/MNMrXmEqJDxYzbicOy1+2iSSFUfgVRsbtBQmHqrzl5 mptrmONoM/Fx4ZkkVJSzCKJ0RK86o7Ht6ePo21JzNnm6bong7aocdDash7K7cQThJ0 JXlxq+OTI4P9g== From: Mark Brown Date: Mon, 07 Aug 2023 23:00:18 +0100 Subject: [PATCH v4 13/36] arm64/gcs: Allow GCS usage at EL0 and EL1 MIME-Version: 1.0 Message-Id: <20230807-arm64-gcs-v4-13-68cfa37f9069@kernel.org> References: <20230807-arm64-gcs-v4-0-68cfa37f9069@kernel.org> In-Reply-To: <20230807-arm64-gcs-v4-0-68cfa37f9069@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-034f2 X-Developer-Signature: v=1; a=openpgp-sha256; l=2248; i=broonie@kernel.org; h=from:subject:message-id; bh=S97P7xSs7G2VtUJIV0J+B0XZVXkpwW1tCMSo+ZYUeDw=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBk0Wmid4tbAShf3/PL65tMRoJhAzK985+MbY4zQtG4 AWS8TpmJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCZNFpogAKCRAk1otyXVSH0CFGB/ 42uOHFOxkOrcFRMVwpLJPgCLRzodl3cgSROjQsafe2+XD0+fK02+FgoeVHgdLqtPqq5N3sdA2m1NFC wKkpNYS34teaHEl9hOZ0klAa3BxjU0mX8SkxQJs42+1wjLmkrDfqn27T8AU7+TwyMyEfw8yYhl54k2 P3snTqZ5i361G8meD0Aj6L3se3eWta4/vr/VfdRFPdYtq6Nhlyrr+CahCp26Cif+4KISBrWrxkESkd 0UX9I+tKDTWYEBnx+8P7Acc54KBHUof2annb0trLelaSOAmRXdcwMrbujlRLpqVY1gWF1kibG9ytG1 pKhWa7ssyTMMZyk+OqAVU/vr6HACcs X-Developer-Key: i=broonie@kernel.org; a=openpgp; fpr=3F2568AAC26998F9E813A1C5C3F436CA30F5D8EB Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org 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 +++++++++++++++++ arch/arm64/include/asm/kvm_arm.h | 4 ++-- 2 files changed, 19 insertions(+), 2 deletions(-) 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 diff --git a/arch/arm64/include/asm/kvm_arm.h b/arch/arm64/include/asm/kvm_arm.h index 58e5eb27da68..9c84e200217b 100644 --- a/arch/arm64/include/asm/kvm_arm.h +++ b/arch/arm64/include/asm/kvm_arm.h @@ -94,8 +94,8 @@ #define HCR_HOST_NVHE_PROTECTED_FLAGS (HCR_HOST_NVHE_FLAGS | HCR_TSC) #define HCR_HOST_VHE_FLAGS (HCR_RW | HCR_TGE | HCR_E2H) -#define HCRX_GUEST_FLAGS (HCRX_EL2_SMPME | HCRX_EL2_TCR2En) -#define HCRX_HOST_FLAGS (HCRX_EL2_MSCEn | HCRX_EL2_TCR2En) +#define HCRX_GUEST_FLAGS (HCRX_EL2_SMPME | HCRX_EL2_TCR2En | HCRX_EL2_GCSEn) +#define HCRX_HOST_FLAGS (HCRX_EL2_MSCEn | HCRX_EL2_TCR2En | HCRX_EL2_GCSEn) /* TCR_EL2 Registers bits */ #define TCR_EL2_RES1 ((1U << 31) | (1 << 23))