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 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 5AB1DC4345F for ; Fri, 12 Apr 2024 08:44:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=BFINlhInYhmlsSaItK/igs+9dc3eMtfDTWaf/oUs5vY=; b=wvYKFHmXubgwxA A3XblPwxOQCwLowXK1fcrUSBcXmQM943zxJwyAJoV0cB/rneCvPZ11AsSey5dvdYDdOUmssugtO9V W4z6s12QAzurU0jOwV6wmZBvhjRRSVOOA5iiSBcY1stjv4q49cmkinhhXXGLrAGehn0akgbyn9Rxh PQtFw88MIsGk32vjSxCuayz+LP4XEbpSrzG4b/XwkvDO7/bbHopxBkzGPVmj5CnJxnBk/Iv0hroyW vKc5/lmsuEc9uvv8gRurrgbwpp8BeAIsrQsgolheS/1ZIa0KU4sBA6ueumecHCZX8T68PSlzZxHTj CnoPBX6aOAxRNxwSUMFQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1rvCVg-0000000G83V-0vKv; Fri, 12 Apr 2024 08:43:48 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1rvCUY-0000000G7Gm-3gcv for linux-arm-kernel@lists.infradead.org; Fri, 12 Apr 2024 08:42:40 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 74209339; Fri, 12 Apr 2024 01:43:07 -0700 (PDT) Received: from e112269-lin.cambridge.arm.com (e112269-lin.cambridge.arm.com [10.1.194.51]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 1CDD63F6C4; Fri, 12 Apr 2024 01:42:36 -0700 (PDT) From: Steven Price To: kvm@vger.kernel.org, kvmarm@lists.linux.dev Cc: Steven Price , Catalin Marinas , Marc Zyngier , Will Deacon , James Morse , Oliver Upton , Suzuki K Poulose , Zenghui Yu , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Joey Gouly , Alexandru Elisei , Christoffer Dall , Fuad Tabba , linux-coco@lists.linux.dev, Ganapatrao Kulkarni Subject: [PATCH v2 07/14] arm64: Make the PHYS_MASK_SHIFT dynamic Date: Fri, 12 Apr 2024 09:42:06 +0100 Message-Id: <20240412084213.1733764-8-steven.price@arm.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240412084213.1733764-1-steven.price@arm.com> References: <20240412084056.1733704-1-steven.price@arm.com> <20240412084213.1733764-1-steven.price@arm.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240412_014239_159330_3BF56615 X-CRM114-Status: GOOD ( 13.97 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Make the PHYS_MASK_SHIFT dynamic for Realms. This is only is required for masking the PFN from a pte entry. Elsewhere, we could still use the PA bits configured by the kernel. So, this patch: -> renames PHYS_MASK_SHIFT -> MAX_PHYS_SHIFT as supported by the kernel -> Makes PHYS_MASK_SHIFT -> Dynamic value of the (I)PA bit width -> For a realm: reduces phys_mask_shift if the RMM reports a smaller configured size for the guest. Co-developed-by: Suzuki K Poulose Signed-off-by: Suzuki K Poulose Signed-off-by: Steven Price --- arch/arm64/include/asm/kvm_arm.h | 2 +- arch/arm64/include/asm/pgtable-hwdef.h | 4 ++-- arch/arm64/include/asm/pgtable.h | 5 +++++ arch/arm64/kernel/rsi.c | 5 +++++ 4 files changed, 13 insertions(+), 3 deletions(-) diff --git a/arch/arm64/include/asm/kvm_arm.h b/arch/arm64/include/asm/kvm_arm.h index e01bb5ca13b7..9944aca348bd 100644 --- a/arch/arm64/include/asm/kvm_arm.h +++ b/arch/arm64/include/asm/kvm_arm.h @@ -398,7 +398,7 @@ * bits in PAR are res0. */ #define PAR_TO_HPFAR(par) \ - (((par) & GENMASK_ULL(52 - 1, 12)) >> 8) + (((par) & GENMASK_ULL(MAX_PHYS_MASK_SHIFT - 1, 12)) >> 8) #define ECN(x) { ESR_ELx_EC_##x, #x } diff --git a/arch/arm64/include/asm/pgtable-hwdef.h b/arch/arm64/include/asm/pgtable-hwdef.h index ef207a0d4f0d..90dc292bed5f 100644 --- a/arch/arm64/include/asm/pgtable-hwdef.h +++ b/arch/arm64/include/asm/pgtable-hwdef.h @@ -206,8 +206,8 @@ /* * Highest possible physical address supported. */ -#define PHYS_MASK_SHIFT (CONFIG_ARM64_PA_BITS) -#define PHYS_MASK ((UL(1) << PHYS_MASK_SHIFT) - 1) +#define MAX_PHYS_MASK_SHIFT (CONFIG_ARM64_PA_BITS) +#define MAX_PHYS_MASK ((UL(1) << PHYS_MASK_SHIFT) - 1) #define TTBR_CNP_BIT (UL(1) << 0) diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h index afdd56d26ad7..f5376bd567a1 100644 --- a/arch/arm64/include/asm/pgtable.h +++ b/arch/arm64/include/asm/pgtable.h @@ -39,6 +39,11 @@ #include #include +extern unsigned int phys_mask_shift; + +#define PHYS_MASK_SHIFT (phys_mask_shift) +#define PHYS_MASK ((1UL << PHYS_MASK_SHIFT) - 1) + #ifdef CONFIG_TRANSPARENT_HUGEPAGE #define __HAVE_ARCH_FLUSH_PMD_TLB_RANGE diff --git a/arch/arm64/kernel/rsi.c b/arch/arm64/kernel/rsi.c index b93252ed6fc5..159bc428c77b 100644 --- a/arch/arm64/kernel/rsi.c +++ b/arch/arm64/kernel/rsi.c @@ -12,6 +12,8 @@ struct realm_config __attribute((aligned(PAGE_SIZE))) config; unsigned long prot_ns_shared; EXPORT_SYMBOL(prot_ns_shared); +unsigned int phys_mask_shift = CONFIG_ARM64_PA_BITS; + DEFINE_STATIC_KEY_FALSE_RO(rsi_present); EXPORT_SYMBOL(rsi_present); @@ -62,5 +64,8 @@ void __init arm64_rsi_init(void) return; prot_ns_shared = BIT(config.ipa_bits - 1); + if (config.ipa_bits - 1 < phys_mask_shift) + phys_mask_shift = config.ipa_bits - 1; + static_branch_enable(&rsi_present); } -- 2.34.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel