From patchwork Mon Jul 1 09:54:54 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Steven Price X-Patchwork-Id: 13717715 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 8CF1C1448E1; Mon, 1 Jul 2024 09:55:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1719827734; cv=none; b=rp6VAp7KyRWDbwKweQEK89UJp7e9P9F7DUyEMyayLHB3hFVxutfU0MjeqS3S9FUIRMaCs+CEH6MIshm05QphMEn6BpZz2u7yTMDvQOp2qT06U6VaVQTwsoGQsaNNS3am4Fgu9DtbXgCt+OsvpAGoGvRLdi39YT78b0UDx62+eB0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1719827734; c=relaxed/simple; bh=qDdEwFYZEnS4OuyvwmRD/Bk40RHQhIMxPRWL03n70D4=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=iMJvant/ZAk31oVRoduppjw5Q4XYWrZHG77qL/W7OJiOlXIDgnf6g7prPYkUkap3PexazMXoPg7nokhdt5lN4gyY1IUSW+O9YBDJBjBZzYNHARZECsB3SXY90b9iRk9CAi7oS7J/xZHA/1Zh43R4XfOlHWMGZnrVMZ0EsRUwdxA= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com 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 D67E2367; Mon, 1 Jul 2024 02:55:56 -0700 (PDT) Received: from e122027.arm.com (unknown [10.57.44.170]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 90FA73F762; Mon, 1 Jul 2024 02:55:28 -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 v4 04/15] arm64: realm: Query IPA size from the RMM Date: Mon, 1 Jul 2024 10:54:54 +0100 Message-Id: <20240701095505.165383-5-steven.price@arm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240701095505.165383-1-steven.price@arm.com> References: <20240701095505.165383-1-steven.price@arm.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 The top bit of the configured IPA size is used as an attribute to control whether the address is protected or shared. Query the configuration from the RMM to assertain which bit this is. Co-developed-by: Suzuki K Poulose Signed-off-by: Suzuki K Poulose Signed-off-by: Steven Price --- Changes since v2: * Drop unneeded extra brackets from PROT_NS_SHARED. * Drop the explicit alignment from 'config' as struct realm_config now specifies the alignment. --- arch/arm64/include/asm/pgtable-prot.h | 3 +++ arch/arm64/kernel/rsi.c | 8 ++++++++ 2 files changed, 11 insertions(+) diff --git a/arch/arm64/include/asm/pgtable-prot.h b/arch/arm64/include/asm/pgtable-prot.h index b11cfb9fdd37..6c29f3b32eba 100644 --- a/arch/arm64/include/asm/pgtable-prot.h +++ b/arch/arm64/include/asm/pgtable-prot.h @@ -70,6 +70,9 @@ #include extern bool arm64_use_ng_mappings; +extern unsigned long prot_ns_shared; + +#define PROT_NS_SHARED (prot_ns_shared) #define PTE_MAYBE_NG (arm64_use_ng_mappings ? PTE_NG : 0) #define PMD_MAYBE_NG (arm64_use_ng_mappings ? PMD_SECT_NG : 0) diff --git a/arch/arm64/kernel/rsi.c b/arch/arm64/kernel/rsi.c index f01bff9dab04..231c1a3ecdeb 100644 --- a/arch/arm64/kernel/rsi.c +++ b/arch/arm64/kernel/rsi.c @@ -8,6 +8,11 @@ #include #include +struct realm_config config; + +unsigned long prot_ns_shared; +EXPORT_SYMBOL(prot_ns_shared); + DEFINE_STATIC_KEY_FALSE_RO(rsi_present); EXPORT_SYMBOL(rsi_present); @@ -71,6 +76,9 @@ void __init arm64_rsi_init(void) return; if (!rsi_version_matches()) return; + if (rsi_get_realm_config(&config)) + return; + prot_ns_shared = BIT(config.ipa_bits - 1); static_branch_enable(&rsi_present); }