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 1DEDEC88E7F for ; Tue, 15 Sep 2026 16:03:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=6qxVBE4Zk8kZe99AN+UCDkJYMmgnn5AY2EHG9aQ5eDc=; b=xLrvfdI4rqKzahOPUtZJdfhUfA VXljg5s5ViuGp3A+76M/lvBST/aMHqq/HIdGXXTklqTYC959dSz52/V8cPIBDDsyVE27D3f6u9evX el6XiPsA8DaNRfyekYBZcQg0dHJ948WtTTDomyen8h/anJQBvD9FFlkBNIuNN/1cpxSmIsElOxgE2 g8KnIzkyMj+cIM5Bwfhd/HTtEHx2Ug8VblBfn1e10cgR0EhaLaECdlLiCAWbHTbAkuzEdudOlCTEX j3tiGq+4wE70XF4zTz3qcrH0IWkX6H8Pl8RaQaOjdSo1Pjv+0i9dCZIzQiXH93+YJtMg0SsoqjJM8 i5g/MdwQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1x6Vcg-00000007Loi-09JC; Tue, 15 Sep 2026 16:03:06 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1x6VcB-00000007LLw-2r4a for linux-arm-kernel@lists.infradead.org; Tue, 15 Sep 2026 16:02:36 +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 88E381570; Tue, 15 Sep 2026 09:02:31 -0700 (PDT) Received: from ewhatever.cambridge.arm.com (ewhatever.cambridge.arm.com [10.2.197.99]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 720E43F882; Tue, 15 Sep 2026 09:02:32 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1789488155; bh=3txRcWQsJihaCMkChZU8QnEkjzabm1OeIAmZ/JVQQZE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Y5vhUav264lnGStYDQ0TrDQfREW9OpKJ195DiEGkUYDHu0TFERlAhLr1bJBeers14 fbsgOkT2O3P7YHJV/Ob3j9ZQ6Y1dUXc3m225l4pacgeBpzLtZ8dsmVh39ueNmoMEzH iz5JZ2FvD2dGagp7aEKsxerDKwiWGv6D9Mty3doQ= From: Suzuki K Poulose To: kvm@vger.kernel.org, kvmarm@lists.linux.dev Cc: maz@kernel.org, will@kernel.org, catalin.marinas@arm.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, steven.price@arm.com, aneesh.kumar@kernel.org, oupton@kernel.org, gshan@redhat.com, joey.gouly@arm.com, tabba@google.com, yuzenghui@huawei.com, linux-coco@lists.linux.dev, gankulkarni@os.amperecomputing.com, sdonthineni@nvidia.com, alpergun@google.com, fj0570is@fujitsu.com, WeiLin.Chang@arm.com, lpieralisi@kernel.org, enju.kohei@fujitsu.com, Suzuki K Poulose Subject: [PATCH v18 14/23] KVM: arm64: CCA: Add a new mode for supporting Realm guests Date: Tue, 15 Sep 2026 17:01:32 +0100 Message-ID: <20260915160141.3543048-15-suzuki.poulose@arm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260915160141.3543048-1-suzuki.poulose@arm.com> References: <20260915160141.3543048-1-suzuki.poulose@arm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260915_090235_768838_A9D12F6D X-CRM114-Status: GOOD ( 11.54 ) 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: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Add an explicit mode to support Arm CCA guests. Signed-off-by: Suzuki K Poulose --- Documentation/admin-guide/kernel-parameters.txt | 3 +++ arch/arm64/include/asm/kvm_host.h | 1 + arch/arm64/kvm/arm.c | 5 +++++ 3 files changed, 9 insertions(+) diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 68647ff4bdd24..1afe3df3b923e 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -3256,6 +3256,9 @@ Kernel parameters nested: VHE-based mode with support for nested virtualization. Requires at least ARMv8.4 hardware (with FEAT_NV2). + rmm: Support for running confidential guests in Realm + world using RMM, as defined by Arm Confidential + Compute Architecture (CCA) Defaults to VHE/nVHE based on hardware support. Setting mode to "protected" will disable kexec and hibernation diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h index 09910b2c61bfb..3cedb71f49ab8 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -69,6 +69,7 @@ enum kvm_mode { KVM_MODE_DEFAULT, KVM_MODE_PROTECTED, KVM_MODE_NV, + KVM_MODE_RMM, KVM_MODE_NONE, }; #ifdef CONFIG_KVM diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c index 42d9385f5e329..ae09d0d9812c5 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -3283,6 +3283,11 @@ static int __init early_kvm_mode_cfg(char *arg) return 0; } + if (strcmp(arg, "rmm") == 0 && !WARN_ON(!is_kernel_in_hyp_mode())) { + kvm_mode = KVM_MODE_RMM; + return 0; + } + return -EINVAL; } early_param("kvm-arm.mode", early_kvm_mode_cfg); -- 2.43.0