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 DB7A3CD4851 for ; Wed, 13 May 2026 13:19:29 +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=P5D25pwVwZCWcCX2/JtJND0go+wiyGT2CNWtxvBru/0=; b=m7PwyaiPHABlNxPo7sknx0TisO qA9DmDIbABLBS+cYQa/EdiL/T7biBFqlQH7NnpxzsLJ6gFObwVSH7NavZtgbu5KtHtzixjTWWRTTY Uce+4RqrB4Pqyo4WkN6a9xr1VHlhDyoymjjS3nny350nr+t03lUy6znX24A3qDBBhf4EW+Qwpyta2 AAnvuYhpl/OmO0OqqIrVR1Q175Uc07+IVbi0Nz37rWsOf8ziD+dHT+pVANrD5FQZi6U2ICQO3zMoj jxGK7Kwk9vAuDUOfrLlK3ujO/6X6slNv7ewt6WtfD0HOkf+j2bTVV20rilJOdrWjEPS94fqMi+k8O N6m6uViw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wN9Uf-00000002exJ-1RlY; Wed, 13 May 2026 13:19:21 +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 1wN9UJ-00000002eRo-1Khr for linux-arm-kernel@lists.infradead.org; Wed, 13 May 2026 13:19:01 +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 A59CD1C14; Wed, 13 May 2026 06:18:52 -0700 (PDT) Received: from e122027.arm.com (unknown [10.57.68.187]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 109993F836; Wed, 13 May 2026 06:18:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1778678337; bh=cG+9RtOTQ3thXfd8j6zA3ANwSbmme4UsvVw8z7/71yk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=HNCsvQpwmOkBeoSKcui3hUmxurM7KnUUNQhk6r+G1ltanJroq5edH5Yg/0zSiqp5c lhYqa4B5RJAuxUGLpBQO8NJQTWTA6bGX5PjH1PVjtc/I9Z/QYnztDLYDSHwlRy4K7W yBASKbLEdu+cEmNH4Xeb+HPslXA4tdSNYpgzZqxk= 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 , Gavin Shan , Shanker Donthineni , Alper Gun , "Aneesh Kumar K . V" , Emi Kisanuki , Vishal Annapurve , WeiLin.Chang@arm.com, Lorenzo.Pieralisi2@arm.com Subject: [PATCH v14 07/44] arm64: RMI: Configure the RMM with the host's page size Date: Wed, 13 May 2026 14:17:15 +0100 Message-ID: <20260513131757.116630-8-steven.price@arm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260513131757.116630-1-steven.price@arm.com> References: <20260513131757.116630-1-steven.price@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-20260513_061859_764735_08974072 X-CRM114-Status: GOOD ( 11.38 ) 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 RMM v2.0 brings the ability to set the RMM's granule size. Check the feature registers and configure the RMM so that it matches the host's page size. This means that operations can be done with a granulatity equal to PAGE_SIZE. Signed-off-by: Steven Price --- Changes since v13: * Moved out of KVM. --- arch/arm64/kernel/rmi.c | 42 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+) diff --git a/arch/arm64/kernel/rmi.c b/arch/arm64/kernel/rmi.c index 99c1ccc35c11..a14ead5dedda 100644 --- a/arch/arm64/kernel/rmi.c +++ b/arch/arm64/kernel/rmi.c @@ -49,6 +49,45 @@ static int rmi_check_version(void) return 0; } +static int rmi_configure(void) +{ + struct rmm_config *config __free(free_page) = NULL; + unsigned long ret; + + config = (struct rmm_config *)get_zeroed_page(GFP_KERNEL); + if (!config) + return -ENOMEM; + + switch (PAGE_SIZE) { + case SZ_4K: + config->rmi_granule_size = RMI_GRANULE_SIZE_4KB; + break; + case SZ_16K: + config->rmi_granule_size = RMI_GRANULE_SIZE_16KB; + break; + case SZ_64K: + config->rmi_granule_size = RMI_GRANULE_SIZE_64KB; + break; + default: + pr_err("Unsupported PAGE_SIZE for RMM\n"); + return -EINVAL; + } + + ret = rmi_rmm_config_set(virt_to_phys(config)); + if (ret) { + pr_err("RMM config set failed\n"); + return -EINVAL; + } + + ret = rmi_rmm_activate(); + if (ret) { + pr_err("RMM activate failed\n"); + return -ENXIO; + } + + return 0; +} + static int __init arm64_init_rmi(void) { /* Continue without realm support if we can't agree on a version */ @@ -60,6 +99,9 @@ static int __init arm64_init_rmi(void) if (WARN_ON(rmi_features(1, &rmm_feat_reg1))) return 0; + if (rmi_configure()) + return 0; + return 0; } subsys_initcall(arm64_init_rmi); -- 2.43.0