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 B046CE75453 for ; Wed, 24 Dec 2025 13:53:09 +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: Content-Type:MIME-Version:Message-ID:Date:Subject:Cc:To:From:Reply-To: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References:List-Owner; bh=DmuPTBK1+j/xQcR53nZlLGqYmcBMfxzHRcOOd3xh0JY=; b=r9ljXZuPx6gWQk0DJ8Q5ktve1L QmdeKlBDAJ6cn76JFBY/mFDIRjxwNqNsi5+QI9WC0KnIMU+Q6WTb06TOhs6z80GzfpnAVaDG65hIW LDlN9w/ZMQuKKSkPLhrdiMTZUdLIeAi/25Vlm5R2p6bK9TTMSHnXOi204yKd+/ilVrNjmXNEn42WW 962FcemtpTVh7DI6hDQcMgIaAby41x0X0/Ub2oXiuJVc7jpW8EisvmdnXaXA8p9ITi1aT7rf5XpXS FR+3YXoc1Kg5O0eVJpMRddcDwEesC+u6psp2S9GQ46VVBTxHUgRGDw+u/uqEBwnOCLq+tpk5pcQbB sn0pS/rA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vYPIS-0000000GvV4-1LZs; Wed, 24 Dec 2025 13:53:00 +0000 Received: from mail-wr1-x436.google.com ([2a00:1450:4864:20::436]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1vYPIO-0000000GvTA-1Ck5 for linux-arm-kernel@lists.infradead.org; Wed, 24 Dec 2025 13:52:58 +0000 Received: by mail-wr1-x436.google.com with SMTP id ffacd0b85a97d-43277900fb4so69655f8f.1 for ; Wed, 24 Dec 2025 05:52:54 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=osyx-tech.20230601.gappssmtp.com; s=20230601; t=1766584373; x=1767189173; darn=lists.infradead.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=DmuPTBK1+j/xQcR53nZlLGqYmcBMfxzHRcOOd3xh0JY=; b=Y0kNAiN9zB8FooflWiD5FPMgWkPuw6sg0IS/0P5LFuYKuswv7eon5EMFrInVssTrVW G1TXJzVjrZuqg5Jt89R2iaCiOd3DnQIoYjzLxIVxHx311CC3YzU+P3fvprYcvw7cRbdb 1nfQ5PcvsPKybhTT4EOv62LZCuO0wKnuhW3HBQg187NLwv0RFdYjxEIzj+mAyasodAZk lT5jt+jcaPac/4eWPasHppILmoTKI2d6bDGuPNSGOmaASTKRTQ3DQXlzWx60Ds9szY54 syb+V3ZjnLR5cecwSS85HKCqva14FJv2IGZ+Gydke/DRt5y6ywfilw4kVrCeNkLaEOWV xkPg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1766584373; x=1767189173; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-gg:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=DmuPTBK1+j/xQcR53nZlLGqYmcBMfxzHRcOOd3xh0JY=; b=D+xgqn7GPGd3sVYZV5H5JRbTJzN/8D+uzKlxLJQb1vrOk2nTAjSK7l0wTDGBrzabXJ ZCB83VKwL/Rx1D/FQjjK4DoCrgkE1Z4Rp1xQWEoHkTOC4+fNf2sPL+2QTdWKzyAJd+wz d5rVtoQMf9WzvsaXm5bPL9TFHicG7SUm69qKkBOvGZJJTUf3ubWRwzBrFEd+bWYF2SFu 4eFSWjqtcG2s4HaeBVnJZm2z5Q8EDL0SOPXwPctGbEVkDujGS1UrVw+5Ko0+txBNqfSD ApeNovi+nkQMvDmQ5SzQ9QOEAYpRdam6GGPyeJZJgqrldgK3/gPIBcO3SrYEwVQTZ4aH SIYw== X-Forwarded-Encrypted: i=1; AJvYcCXVELkUIzhRHLk1RgbWzqFWdK61sZG3ujsF/xdAJ+u6mFV8KWjur7M6bB+LwXhtXSeI3Vxy6N34etIxBk43z2Z5@lists.infradead.org X-Gm-Message-State: AOJu0YxPq3OMxK7AI1xnVUBLar2ljnCbUJ2oXTVL8kUQZj0KkfLbo91A dIrEBUBl7AkS7mKwlegAubt+qYPTuVFRVj58XHaAt9czXxUl8msHhvgqt4k3LB1QwoQu X-Gm-Gg: AY/fxX5XmFtiH6YZR2yT+u06OTkiR5Ov/zfbEYO5mTXjlBHFpFOhrKvKRocAkF5z1ce Bzv69BEJ08cjIIyh46ATZMCwpJCcH7bHW4YufzsRlQtJkJu/tnYQZdueiaqc3yA+1J/URKqup04 HiQ1uylgljt5r8QtrpEQjQQBhgDK2GIhsIaLOzVhfFlFX6OqPIYpPpqCETAoIqG2fPlAQThHClB IQ5hgNP12k4415+ZLgCN4o4T4zHF6bZSwrdQh1kHmXH2i9R4byRTR9SkFnJAfNDk4uWdxmaOCar rrjagNPnOLnBA9HTDRM8NlBzzX5BQs36kYA+gkqt122c5b6YAgd4/nK9D+tcO9+b+W2x7iVmr7P hRKuT1mQiTSjMOKj1PjcTSRCe3mUKXfB1k9jsbasq8ZLI+pa7R8x3tAJsZZsVUnR9z6VZt+1Gdq DLtyxu+LYXfAcFzsEEmg== X-Google-Smtp-Source: AGHT+IHoJrb07B1cdykCE7qYkiqA5eIOoSQMy9mbNo39VeuUJ9/LLv9crUrYThO0HyLNCGIS21PtnA== X-Received: by 2002:a5d:5d02:0:b0:431:66a:cbda with SMTP id ffacd0b85a97d-4324425829amr25725416f8f.0.1766584372997; Wed, 24 Dec 2025 05:52:52 -0800 (PST) Received: from jp-linux.Home ([2001:8a0:f59c:a900:39e4:e84d:192a:5c5c]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-4324eaa64cesm34494677f8f.35.2025.12.24.05.52.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 24 Dec 2025 05:52:52 -0800 (PST) From: joaopeixoto@osyx.tech To: linux-kernel@vger.kernel.org Cc: ajd@linux.ibm.com, alex@ghiti.fr, aou@eecs.berkeley.edu, bagasdotme@gmail.com, catalin.marinas@arm.com, conor+dt@kernel.org, corbet@lwn.net, dan.j.williams@intel.com, davidmcerdeira@osyx.tech, devicetree@vger.kernel.org, dev@kael-k.io, gregkh@linuxfoundation.org, haren@linux.ibm.com, heiko@sntech.de, joaopeixoto@osyx.tech, jose@osyx.tech, kever.yang@rock-chips.com, krzk+dt@kernel.org, linux-arm-kernel@lists.infradead.org, linux@armlinux.org.uk, linux-doc@vger.kernel.org, linux-riscv@lists.infradead.org, maddy@linux.ibm.com, mani@kernel.org, nathan@kernel.org, neil.armstrong@linaro.org, palmer@dabbelt.com, pjw@kernel.org, prabhakar.mahadev-lad.rj@bp.renesas.com, robh@kernel.org, will@kernel.org Subject: [PATCH 0/5] virt: Add Bao hypervisor IPC and I/O dispatcher drivers Date: Wed, 24 Dec 2025 13:52:12 +0000 Message-ID: <20251224135217.25350-1-joaopeixoto@osyx.tech> X-Mailer: git-send-email 2.43.0 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20251224_055256_599080_FBC760E1 X-CRM114-Status: GOOD ( 12.85 ) 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 From: João Peixoto This series introduces support for the Bao hypervisor guest-side drivers under drivers/virt/bao and the associated Device Tree bindings, UAPI, and MAINTAINERS entries. Bao is a lightweight static-partitioning hypervisor for embedded and safety-critical systems. This series adds: - The Bao IPC shared memory driver, which enables Linux guests to communicate with each other through shared memory regions. - The Bao I/O Dispatcher driver, which allows Bao's VMs to share I/O devices using device paravirtualization (VirtIO). Patch overview: 1. dt-bindings: Add Bao IPC shared memory driver binding - Provides a standardized DT description for Bao IPC shared memory devices used for inter-VM communication. 2. virt: add Bao IPC shared memory driver - Character device driver that maps shared-memory regions and communicates with the hypervisor via architecture-specific hypercalls (SMC/HVC on ARM, SBI ecall on RISC-V). 3. dt-bindings: Add Bao I/O dispatcher driver binding - DT binding for the Bao I/O Dispatcher, describing memory regions, interrupts, and compatible strings for backend VMs. 4. virt: add Bao I/O dispatcher driver - Implements the I/O Dispatcher kernel module bridging Bao Remote I/O with VirtIO backend devices. - Includes architecture-specific headers for ARM, ARM64, and RISC-V, driver framework files, UAPI headers, Kconfig/Makefile integration, and ioctl documentation. 5. MAINTAINERS: Add entries for Bao hypervisor drivers - Registers maintainers for all Bao hypervisor components to ensure proper kernel review and notifications. This series has been validated on Linux guests running under Bao hypervisor, ensuring correct initialization, read/write operations for IPC shared memory, and proper I/O Dispatcher functionality for backend VMs. Feedback and review from maintainers of virtualization, architecture-specific code (ARM, ARM64, RISC-V), Device Tree bindings, and UAPI are welcome. João Peixoto (5): dt-bindings: Add Bao IPC shared memory driver binding virt: add Bao IPC shared memory driver dt-bindings: Add Bao I/O dispatcher driver binding virt: add Bao I/O dispatcher driver MAINTAINERS: Add entries for Bao hypervisor drivers, headers, and DT bindings .../bindings/bao/io-dispatcher.yaml | 67 +++ .../devicetree/bindings/bao/ipcshmem.yaml | 99 ++++ .../devicetree/bindings/vendor-prefixes.yaml | 2 + .../userspace-api/ioctl/ioctl-number.rst | 2 + MAINTAINERS | 12 + arch/arm/include/asm/bao.h | 62 ++ arch/arm64/include/asm/bao.h | 62 ++ arch/riscv/include/asm/bao.h | 61 ++ drivers/virt/Kconfig | 2 + drivers/virt/Makefile | 2 + drivers/virt/bao/Kconfig | 5 + drivers/virt/bao/Makefile | 4 + drivers/virt/bao/io-dispatcher/Kconfig | 16 + drivers/virt/bao/io-dispatcher/Makefile | 4 + drivers/virt/bao/io-dispatcher/bao_drv.h | 386 +++++++++++++ drivers/virt/bao/io-dispatcher/dm.c | 330 +++++++++++ drivers/virt/bao/io-dispatcher/driver.c | 348 +++++++++++ drivers/virt/bao/io-dispatcher/hypercall.h | 30 + drivers/virt/bao/io-dispatcher/intc.c | 68 +++ drivers/virt/bao/io-dispatcher/io_client.c | 435 ++++++++++++++ .../virt/bao/io-dispatcher/io_dispatcher.c | 207 +++++++ drivers/virt/bao/io-dispatcher/ioctls.c | 145 +++++ drivers/virt/bao/io-dispatcher/ioeventfd.c | 336 +++++++++++ drivers/virt/bao/io-dispatcher/irqfd.c | 341 +++++++++++ drivers/virt/bao/ipcshmem/Kconfig | 9 + drivers/virt/bao/ipcshmem/Makefile | 3 + drivers/virt/bao/ipcshmem/ipcshmem.c | 539 ++++++++++++++++++ include/uapi/linux/bao.h | 124 ++++ 28 files changed, 3701 insertions(+) create mode 100644 Documentation/devicetree/bindings/bao/io-dispatcher.yaml create mode 100644 Documentation/devicetree/bindings/bao/ipcshmem.yaml create mode 100644 arch/arm/include/asm/bao.h create mode 100644 arch/arm64/include/asm/bao.h create mode 100644 arch/riscv/include/asm/bao.h create mode 100644 drivers/virt/bao/Kconfig create mode 100644 drivers/virt/bao/Makefile create mode 100644 drivers/virt/bao/io-dispatcher/Kconfig create mode 100644 drivers/virt/bao/io-dispatcher/Makefile create mode 100644 drivers/virt/bao/io-dispatcher/bao_drv.h create mode 100644 drivers/virt/bao/io-dispatcher/dm.c create mode 100644 drivers/virt/bao/io-dispatcher/driver.c create mode 100644 drivers/virt/bao/io-dispatcher/hypercall.h create mode 100644 drivers/virt/bao/io-dispatcher/intc.c create mode 100644 drivers/virt/bao/io-dispatcher/io_client.c create mode 100644 drivers/virt/bao/io-dispatcher/io_dispatcher.c create mode 100644 drivers/virt/bao/io-dispatcher/ioctls.c create mode 100644 drivers/virt/bao/io-dispatcher/ioeventfd.c create mode 100644 drivers/virt/bao/io-dispatcher/irqfd.c create mode 100644 drivers/virt/bao/ipcshmem/Kconfig create mode 100644 drivers/virt/bao/ipcshmem/Makefile create mode 100644 drivers/virt/bao/ipcshmem/ipcshmem.c create mode 100644 include/uapi/linux/bao.h -- 2.43.0