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 88072CD4851 for ; Wed, 13 May 2026 13:22:03 +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=4lHGv1cauEu+lO8DnDsVV8WzhJdxsNDsfPvHDuZ/o5Y=; b=CyUyHDU75rJmt5YKfHqxz0hBy4 sHQKTdHxb8ZO/aO/QW/0P0lbjporhNk4AuxZQhh0XWhUGeWfF2/FiCaWmXRqv+EarmU2FVdBA1shr lQ79L55djl+taY3c1/9T+N51M/9aPdEPBmF1N7tY9px7Luz/Y+Nradvr5Ins555mws/B8Cl/Ou1BB nq3Uo/soGbUmSEfBGcniwuNaLJ4eMaC230cd9hu70LsmdV4KjvLlRgX2qqCK+Kw0AY1GFP2t01viI wr21PdztstRMjOiSKIQIBJjEmCM0qn5/J8TC9yLsop2COaMZ3JTj7NsP442QbI56QwVCTejcH8lUm mrwcwpVA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wN9X5-00000002i5v-137D; Wed, 13 May 2026 13:21:53 +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 1wN9Wx-00000002hwi-1Bza for linux-arm-kernel@lists.infradead.org; Wed, 13 May 2026 13:21:50 +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 47D29302F; Wed, 13 May 2026 06:21:37 -0700 (PDT) Received: from e122027.arm.com (unknown [10.57.68.187]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 077703F836; Wed, 13 May 2026 06:21:36 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1778678502; bh=ahSr2bArsjLTryRlYgq0r6I21OJ7FScjdi4FRRA9v1U=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=cgy8ErHk5Cn4+pmGXa1XRHdZm0ISl5zgck1tPNsx81EOxYp5oh36AmQ17ZPvcEcBP AcfgE18VhtJaBeRiktawpEyErUJkRmKNjHaxw4JNpvf19hKfJ70vsZ3EYP60vKTFLa R6kmUCHtqt80X1f2mY8WQEuuMlD+d5V+Agl+qPW4= 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 37/44] arm64: RMI: Prevent Device mappings for Realms Date: Wed, 13 May 2026 14:17:45 +0100 Message-ID: <20260513131757.116630-38-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_062143_432563_7EF37110 X-CRM114-Status: GOOD ( 10.74 ) 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 Physical device assignment is not yet supported. RMM v2.0 does add the relevant APIs, but device assignment is a big topic so will be handled in a future patch series. For now prevent device mappings when the guest is a realm. Signed-off-by: Steven Price --- Changes from v6: * Fix the check in user_mem_abort() to prevent all pages that are not guest_memfd() from being mapped into the protected half of the IPA. Changes from v5: * Also prevent accesses in user_mem_abort() --- arch/arm64/kvm/mmu.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c index 776ffe56d17e..7678226ffd38 100644 --- a/arch/arm64/kvm/mmu.c +++ b/arch/arm64/kvm/mmu.c @@ -1230,6 +1230,10 @@ int kvm_phys_addr_ioremap(struct kvm *kvm, phys_addr_t guest_ipa, if (is_protected_kvm_enabled()) return -EPERM; + /* We don't support mapping special pages into a Realm */ + if (kvm_is_realm(kvm)) + return -EPERM; + size += offset_in_page(guest_ipa); guest_ipa &= PAGE_MASK; -- 2.43.0