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 48561C55182 for ; Mon, 3 Aug 2026 13:47:21 +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=H8ElnFeb1Z3Bn7wd2FbJtfPrUjLWHnVW3u35FM1dhvg=; b=kcv1l7ccgddEtbsbswdACsvC/g d5rt9IxGTVKM4M4i9RhLoPmPUg+eLOC83EZzNNzUYc3eMyIkB1lXy5R67r8T7BZHGjkXz8Okm+bHE OYbbSudcLLVDBGVpMmV8vOg7fUK7xSCjrGL6n6QcG6F5kf6I24fwziiT/Q2VLZSRyUSoNewp+vJlm oIKbC1qC0lcyCDxp47qRC/KrTIhKuS3MuKWlN/1C4rOyp0ot/QSz+m/bsqTDcEAPL07DIlk3JWkq6 RkCj/hw2O4oFPnl1nbVlPAUCEoRKkGapkRd02w3k69jfpM1EbDGXtaofv9YpGexxiGZuwzQNgfzja 5I2FA+FQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wqt0d-0000000HEQf-0Su2; Mon, 03 Aug 2026 13:47:15 +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 1wqt0a-0000000HENo-0a86 for linux-arm-kernel@lists.infradead.org; Mon, 03 Aug 2026 13:47:14 +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 82BB21476; Mon, 3 Aug 2026 06:47:07 -0700 (PDT) Received: from e122027.cambridge.arm.com (e122027.cambridge.arm.com [10.1.25.28]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 2C9473F66F; Mon, 3 Aug 2026 06:47:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1785764831; bh=/DkC06ykICbYbu8lRH1puAEPBlPtvdphP1WP+AibYYM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=nJL02zq6f5gv2qEXZaqhk/tOZBNFN9bDgX8UixwRkjIKrvCAKwKZcDJ+ZJ0tJbOXT NkoKF6RmOClf968xdoAMBUGuCh4pPem5XWXc6jZ2r77v4TvZKKAK6x52gHQHBMKE84 cnV6TMf69xNqmNSdLkP7hrsubVrpbPWLsOaanzpA= 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 Pieralisi Subject: [PATCH v16 37/45] KVM: arm64: CCA: Prevent Device mappings for realms Date: Mon, 3 Aug 2026 14:43:53 +0100 Message-ID: <20260803134403.80630-38-steven.price@arm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260803134403.80630-1-steven.price@arm.com> References: <20260803134403.80630-1-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-20260803_064712_234827_02CFC8CB 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 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 79119cb136b0..dc27f3dfb337 100644 --- a/arch/arm64/kvm/mmu.c +++ b/arch/arm64/kvm/mmu.c @@ -1261,6 +1261,10 @@ 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