From nobody Fri Jan 9 09:18:47 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; envelope-from=xen-devel-bounces@lists.xenproject.org; helo=lists.xenproject.org; Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; envelope-from=xen-devel-bounces@lists.xenproject.org; helo=lists.xenproject.org; Authentication-Results: mx.zohomail.com; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org; dmarc=fail(p=none dis=none) header.from=arm.com Return-Path: Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) by mx.zohomail.com with SMTPS id 1767612983129793.1074594185155; Mon, 5 Jan 2026 03:36:23 -0800 (PST) Received: from list by lists.xenproject.org with outflank-mailman.1195269.1513283 (Exim 4.92) (envelope-from ) id 1vcisS-0005dB-NZ; Mon, 05 Jan 2026 11:36:00 +0000 Received: by outflank-mailman (output) from mailman id 1195269.1513283; Mon, 05 Jan 2026 11:36:00 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1vcisS-0005d1-Jq; Mon, 05 Jan 2026 11:36:00 +0000 Received: by outflank-mailman (input) for mailman id 1195269; Mon, 05 Jan 2026 11:35:58 +0000 Received: from se1-gles-flk1-in.inumbo.com ([94.247.172.50] helo=se1-gles-flk1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1vcisQ-0004YP-Ty for xen-devel@lists.xenproject.org; Mon, 05 Jan 2026 11:35:58 +0000 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by se1-gles-flk1.inumbo.com (Halon) with ESMTP id b3955a49-ea2a-11f0-9ccf-f158ae23cfc8; Mon, 05 Jan 2026 12:35:57 +0100 (CET) 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 DC96B339; Mon, 5 Jan 2026 03:35:49 -0800 (PST) Received: from e134099.cambridge.arm.com (e134099.arm.com [10.1.198.34]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 633843F5A1; Mon, 5 Jan 2026 03:35:55 -0800 (PST) X-Outflank-Mailman: Message body and most headers restored to incoming version X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: b3955a49-ea2a-11f0-9ccf-f158ae23cfc8 From: Harry Ramsey To: xen-devel@lists.xenproject.org Cc: Luca.Fancellu@arm.com, Penny Zheng , Stefano Stabellini , Julien Grall , Bertrand Marquis , Michal Orzel , Volodymyr Babchuk , Penny Zheng , Wei Chen , Luca Fancellu Subject: [PATCH v2 6/6] arm/mpu: Map domain page in AArch64 MPU systems Date: Mon, 5 Jan 2026 11:35:03 +0000 Message-ID: <20260105113503.2674777-7-harry.ramsey@arm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260105113503.2674777-1-harry.ramsey@arm.com> References: <20260105113503.2674777-1-harry.ramsey@arm.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ZM-MESSAGEID: 1767612985623154100 Content-Type: text/plain; charset="utf-8" From: Penny Zheng In MPU systems, we implement map_domain_page()/unmap_domain_page() through mapping the domain page with a MPU region on demand. Signed-off-by: Penny Zheng Signed-off-by: Wei Chen Signed-off-by: Luca Fancellu Signed-off-by: Harry Ramsey --- v2: - No changes --- xen/arch/arm/Kconfig | 1 + xen/arch/arm/mpu/Makefile | 1 + xen/arch/arm/mpu/domain-page.c | 53 ++++++++++++++++++++++++++++++++++ 3 files changed, 55 insertions(+) create mode 100644 xen/arch/arm/mpu/domain-page.c diff --git a/xen/arch/arm/Kconfig b/xen/arch/arm/Kconfig index cf6af68299..baa6c4cf15 100644 --- a/xen/arch/arm/Kconfig +++ b/xen/arch/arm/Kconfig @@ -91,6 +91,7 @@ config MMU =20 config MPU bool "MPU" if UNSUPPORTED + select ARCH_MAP_DOMAIN_PAGE if ARM_64 select STATIC_MEMORY help Memory Protection Unit (MPU). Select if you plan to run Xen on ARMv8-R diff --git a/xen/arch/arm/mpu/Makefile b/xen/arch/arm/mpu/Makefile index 4963c8b550..940297af3f 100644 --- a/xen/arch/arm/mpu/Makefile +++ b/xen/arch/arm/mpu/Makefile @@ -1,5 +1,6 @@ obj-$(CONFIG_ARM_32) +=3D arm32/ obj-$(CONFIG_ARM_64) +=3D arm64/ +obj-$(CONFIG_ARM_64) +=3D domain-page.o obj-y +=3D mm.o obj-y +=3D p2m.o obj-y +=3D setup.init.o diff --git a/xen/arch/arm/mpu/domain-page.c b/xen/arch/arm/mpu/domain-page.c new file mode 100644 index 0000000000..1b43bf82a6 --- /dev/null +++ b/xen/arch/arm/mpu/domain-page.c @@ -0,0 +1,53 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ + +#include +#include +#include +#include +#include + +void *map_domain_page_global(mfn_t mfn) +{ + BUG_ON("unimplemented"); + return NULL; +} + +/* Map a page of domheap memory */ +void *map_domain_page(mfn_t mfn) +{ + paddr_t pa =3D mfn_to_maddr(mfn); + + if ( map_pages_to_xen((unsigned long)pa, mfn, 1, PAGE_HYPERVISOR_RW) ) + return NULL; + + return maddr_to_virt(pa); +} + +/* Release a mapping taken with map_domain_page() */ +void unmap_domain_page(const void *ptr) +{ + paddr_t base =3D virt_to_maddr(ptr); + + if ( destroy_xen_mapping_containing(base) ) + panic("Failed to unmap domain page\n"); +} + +mfn_t domain_page_map_to_mfn(const void *ptr) +{ + BUG_ON("unimplemented"); + return INVALID_MFN; +} + +void unmap_domain_page_global(const void *va) +{ + BUG_ON("unimplemented"); +} + +/* + * Local variables: + * mode: C + * c-file-style: "BSD" + * c-basic-offset: 4 + * indent-tabs-mode: nil + * End: + */ --=20 2.43.0