From patchwork Thu Jan 12 19:18:31 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Marc Zyngier X-Patchwork-Id: 13098657 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 D7A4EC63797 for ; Thu, 12 Jan 2023 19:27:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240047AbjALT1q (ORCPT ); Thu, 12 Jan 2023 14:27:46 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49700 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231566AbjALT1C (ORCPT ); Thu, 12 Jan 2023 14:27:02 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C95BD8FE5 for ; Thu, 12 Jan 2023 11:21:14 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 7B7A8B82017 for ; Thu, 12 Jan 2023 19:21:13 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3038BC433D2; Thu, 12 Jan 2023 19:21:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1673551272; bh=bqx6jidbc2f+LQLxjJDORJmIUTqcTIYjVPiIBgFGjyA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=D35SiJ5qO+6sOQcBUYIMu59oly1r5exZdxt0apcO5I4g/DFmwwZv3cX/771Zh8YYV F4CgGxPicEbH75M+Jl3uwjxJD1h5Gq0N2i1c53sfusNs3zyVZdFCnjA2NZfLBJZAPX wuDYDOTHTZsV5+8zYUQSXxb0fF71P+0zPDoIPVeBPM7UosTD0khSP4NJCET612T0WW s2K1FixLwLqqzEnN0jJHLkaOBmbxFVu5YIVFu+ozV/kwFKn/Sb+MW47MtHlVy5ggtW 2Dl8qnVOM3vri3dME/x7RrZ2uKktQJRNSMg86NuQHDlsBKRcXlFMGGE2AAhLnOOh8j YOlQ92a7FGe1g== Received: from sofa.misterjones.org ([185.219.108.64] helo=valley-girl.lan) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.95) (envelope-from ) id 1pG36y-001IWu-7M; Thu, 12 Jan 2023 19:19:40 +0000 From: Marc Zyngier To: kvmarm@lists.linux.dev, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: Alexandru Elisei , Andre Przywara , Chase Conklin , Christoffer Dall , Ganapatrao Kulkarni , Jintack Lim , Russell King , James Morse , Suzuki K Poulose , Oliver Upton , Zenghui Yu Subject: [PATCH v7 12/68] KVM: arm64: nv: Add non-VHE-EL2->EL1 translation helpers Date: Thu, 12 Jan 2023 19:18:31 +0000 Message-Id: <20230112191927.1814989-13-maz@kernel.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230112191927.1814989-1-maz@kernel.org> References: <20230112191927.1814989-1-maz@kernel.org> MIME-Version: 1.0 X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: kvmarm@lists.linux.dev, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, alexandru.elisei@arm.com, andre.przywara@arm.com, chase.conklin@arm.com, christoffer.dall@arm.com, gankulkarni@os.amperecomputing.com, jintack@cs.columbia.edu, rmk+kernel@armlinux.org.uk, james.morse@arm.com, suzuki.poulose@arm.com, oliver.upton@linux.dev, yuzenghui@huawei.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Some EL2 system registers immediately affect the current execution of the system, so we need to use their respective EL1 counterparts. For this we need to define a mapping between the two. In general, this only affects non-VHE guest hypervisors, as VHE system registers are compatible with the EL1 counterparts. These helpers will get used in subsequent patches. Co-developed-by: Andre Przywara Signed-off-by: Andre Przywara Signed-off-by: Marc Zyngier --- arch/arm64/include/asm/kvm_nested.h | 48 +++++++++++++++++++++++++++++ 1 file changed, 48 insertions(+) diff --git a/arch/arm64/include/asm/kvm_nested.h b/arch/arm64/include/asm/kvm_nested.h index fd601ea68d13..f7bb1f0d0954 100644 --- a/arch/arm64/include/asm/kvm_nested.h +++ b/arch/arm64/include/asm/kvm_nested.h @@ -2,6 +2,7 @@ #ifndef __ARM64_KVM_NESTED_H #define __ARM64_KVM_NESTED_H +#include #include static inline bool vcpu_has_nv(const struct kvm_vcpu *vcpu) @@ -11,4 +12,51 @@ static inline bool vcpu_has_nv(const struct kvm_vcpu *vcpu) test_bit(KVM_ARM_VCPU_HAS_EL2, vcpu->arch.features)); } +/* Translation helpers from non-VHE EL2 to EL1 */ +static inline u64 tcr_el2_ps_to_tcr_el1_ips(u64 tcr_el2) +{ + return (u64)FIELD_GET(TCR_EL2_PS_MASK, tcr_el2) << TCR_IPS_SHIFT; +} + +static inline u64 translate_tcr_el2_to_tcr_el1(u64 tcr) +{ + return TCR_EPD1_MASK | /* disable TTBR1_EL1 */ + ((tcr & TCR_EL2_TBI) ? TCR_TBI0 : 0) | + tcr_el2_ps_to_tcr_el1_ips(tcr) | + (tcr & TCR_EL2_TG0_MASK) | + (tcr & TCR_EL2_ORGN0_MASK) | + (tcr & TCR_EL2_IRGN0_MASK) | + (tcr & TCR_EL2_T0SZ_MASK); +} + +static inline u64 translate_cptr_el2_to_cpacr_el1(u64 cptr_el2) +{ + u64 cpacr_el1 = 0; + + if (cptr_el2 & CPTR_EL2_TTA) + cpacr_el1 |= CPACR_ELx_TTA; + if (!(cptr_el2 & CPTR_EL2_TFP)) + cpacr_el1 |= CPACR_ELx_FPEN; + if (!(cptr_el2 & CPTR_EL2_TZ)) + cpacr_el1 |= CPACR_ELx_ZEN; + + return cpacr_el1; +} + +static inline u64 translate_sctlr_el2_to_sctlr_el1(u64 val) +{ + /* Only preserve the minimal set of bits we support */ + val &= (SCTLR_ELx_M | SCTLR_ELx_A | SCTLR_ELx_C | SCTLR_ELx_SA | + SCTLR_ELx_I | SCTLR_ELx_IESB | SCTLR_ELx_WXN | SCTLR_ELx_EE); + val |= SCTLR_EL1_RES1; + + return val; +} + +static inline u64 translate_ttbr0_el2_to_ttbr0_el1(u64 ttbr0) +{ + /* Clear the ASID field */ + return ttbr0 & ~GENMASK_ULL(63, 48); +} + #endif /* __ARM64_KVM_NESTED_H */