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[2403:580b:97e8:0:82ce:f179:8a79:69f4]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-219dc9705d7sm375775ad.102.2024.12.18.14.31.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 18 Dec 2024 14:31:08 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1734561069; x=1735165869; darn=nongnu.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=NZnQvDJEi7HXlOXLCKLwDPej2YMr4PBU00RujiRp/TU=; b=ZHI9/FhR3BKQvde8hUjT4fNdJVmzwFX9iouo7eRGW4xHiEXI/uj+YLPqrJC/++1rGQ YrdpesfBJDmOQ/btk3Egbk43wWwOM3R09jyCNoLU7i7KDlQ2O6bTOTmF74wPU9g0IG4y NuN9CSqlm7MmHSI7WraZpTjqgAfV4JYBB+Sz2LmvfdEgYvqLghD8lQWazkaSwE7SERXj IcmgbpqmUc9P+vDuR9UyQHh9rB3HFpacoxs3f+qv45qPjNQcDcGEAwWPI6gAgtODcIbf Kcz4oFF1guBA0O8VO7D0RSo7WDq+/Ih01cRP56b0V9vBvPqxetGUE3Ia89oDOsjcXOAi +AZg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1734561069; x=1735165869; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=NZnQvDJEi7HXlOXLCKLwDPej2YMr4PBU00RujiRp/TU=; b=C0qoUPYVDNIwyZqZiyRd+ID2Yj9roCtEYih8gebVvE6CLxmDLMOwptJFuFMT00ZbZv VfuK9BUa/rOa3S0WoCc/euJ5sX+1klyCdimraF85EbQE8JycL1pz7ftUmiZg6pSm4np5 i1Kqngx1UxOScwjFaqkliNtmDzVuSgPLlT+MSbrFM4dfPm6ncASvzwuiiqBS1PqNn3iV TGxsEj7L2nzZZOQ0DXRAt8Us//u8y1KmuxjTJBV9my+GY1aS0rGnVOuEl8s2XS5yJkRd Pszsz4Ixv2DXWB2UgaFWA60Z3asVeJx+HhU2cvFa/Hg1J4mtUzX/ibVRJ8wPheS1shZf bodQ== X-Gm-Message-State: AOJu0Yz9Ugrl6kUeWhuQ75WZcIVfDy3WEqd8Qubs/Ox22Qm/Mvyxfffr tLJBBU/JoycthDZXmXySwY+8n/9gLDVier2JfqCkdkiRGOZiVid2R3pG/HRk X-Gm-Gg: ASbGnctBgvKkRjTN5/yWpJNdpL7/WbsDSxyx1I6yWrAGNyAbUZcQFUpzINq0WSkZ3MV ZE+LAYHrWgXxJvnIWyHwE42vmzd9AvpM9A+9IPvq/lVchlb7cG4hVoN7glaLG+2k8R7zHL7OF5A 416E0atKmzAn4/qDAFFw305RV/G3yKtYpidruq6OPrp4U+SmJZIU1UyaTpZbfWaXh3386GX1CUN 3W3JEOtseahlhgiVe8G62IeUOiFaBj0bdycCFH/RlepSW93FP/iFY+enC+eLgmVN83wpTseu6xT dEfnSWvyUWP7G618yXJ9jkl2nCeBevduIJyVgYdCRI7BwpZcNCLrqj5CHh/PNQ8= X-Google-Smtp-Source: AGHT+IG0f75gXePw1ESh1kSdjuCv3aKSIzB8YVGGUH5dc7e3OriVD4tKoy1OsIlYR/nHW1K2/NXHLA== X-Received: by 2002:a17:902:da89:b0:215:e98c:c5c1 with SMTP id d9443c01a7336-218d722cf3amr69630515ad.30.1734561069068; Wed, 18 Dec 2024 14:31:09 -0800 (PST) From: Alistair Francis <alistair23@gmail.com> X-Google-Original-From: Alistair Francis <alistair.francis@wdc.com> To: qemu-devel@nongnu.org Cc: alistair23@gmail.com, Daniel Henrique Barboza <dbarboza@ventanamicro.com>, Alistair Francis <alistair.francis@wdc.com> Subject: [PULL 18/39] docs: update riscv/virt.rst with kernel-irqchip=split support Date: Thu, 19 Dec 2024 08:29:48 +1000 Message-ID: <20241218223010.1931245-19-alistair.francis@wdc.com> X-Mailer: git-send-email 2.47.1 In-Reply-To: <20241218223010.1931245-1-alistair.francis@wdc.com> References: <20241218223010.1931245-1-alistair.francis@wdc.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2607:f8b0:4864:20::633; envelope-from=alistair23@gmail.com; helo=mail-pl1-x633.google.com X-Spam_score_int: -17 X-Spam_score: -1.8 X-Spam_bar: - X-Spam_report: (-1.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_ENVFROM_END_DIGIT=0.25, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: <qemu-devel.nongnu.org> List-Unsubscribe: <https://lists.nongnu.org/mailman/options/qemu-devel>, <mailto:qemu-devel-request@nongnu.org?subject=unsubscribe> List-Archive: <https://lists.nongnu.org/archive/html/qemu-devel> List-Post: <mailto:qemu-devel@nongnu.org> List-Help: <mailto:qemu-devel-request@nongnu.org?subject=help> List-Subscribe: <https://lists.nongnu.org/mailman/listinfo/qemu-devel>, <mailto:qemu-devel-request@nongnu.org?subject=subscribe> Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @gmail.com) X-ZM-MESSAGEID: 1734561279070116600 Content-Type: text/plain; charset="utf-8" From: Daniel Henrique Barboza <dbarboza@ventanamicro.com> Also add a new page, docs/specs/riscv-aia.rst, where we're documenting the state of AIA support in QEMU w.r.t the controllers being emulated or not depending on the AIA and accelerator settings. Signed-off-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com> Reviewed-by: Alistair Francis <alistair.francis@wdc.com> Message-ID: <20241119191706.718860-9-dbarboza@ventanamicro.com> Signed-off-by: Alistair Francis <alistair.francis@wdc.com> --- docs/specs/index.rst | 1 + docs/specs/riscv-aia.rst | 83 ++++++++++++++++++++++++++++++++++++++ docs/system/riscv/virt.rst | 7 ++++ 3 files changed, 91 insertions(+) create mode 100644 docs/specs/riscv-aia.rst diff --git a/docs/specs/index.rst b/docs/specs/index.rst index ff5a1f03da..d7675cebc2 100644 --- a/docs/specs/index.rst +++ b/docs/specs/index.rst @@ -37,3 +37,4 @@ guest hardware that is specific to QEMU. rapl-msr rocker riscv-iommu + riscv-aia diff --git a/docs/specs/riscv-aia.rst b/docs/specs/riscv-aia.rst new file mode 100644 index 0000000000..8097e2f897 --- /dev/null +++ b/docs/specs/riscv-aia.rst @@ -0,0 +1,83 @@ +.. _riscv-aia: + +RISC-V AIA support for RISC-V machines +=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D + +AIA (Advanced Interrupt Architecture) support is implemented in the ``virt= `` +RISC-V machine for TCG and KVM accelerators. + +The support consists of two main modes: + +- "aia=3Daplic": adds one or more APLIC (Advanced Platform Level Interrupt= Controller) + devices +- "aia=3Daplic-imsic": adds one or more APLIC device and an IMSIC (Incomin= g MSI + Controller) device for each CPU + +From an user standpoint, these modes will behave the same regardless of th= e accelerator +used. From a developer standpoint the accelerator settings will change wh= at it being +emulated in userspace versus what is being emulated by an in-kernel irqchi= p. + +When running TCG, all controllers are emulated in userspace, including mac= hine mode +(m-mode) APLIC and IMSIC (when applicable). + +When running KVM: + +- no m-mode is provided, so there is no m-mode APLIC or IMSIC emulation re= gardless of + the AIA mode chosen +- with "aia=3Daplic", s-mode APLIC will be emulated by userspace +- with "aia=3Daplic-imsic" there are two possibilities. If no additional = KVM option + is provided there will be no APLIC or IMSIC emulation in userspace, and = the virtual + machine will use the provided in-kernel APLIC and IMSIC controllers. If= the user + chooses to use the irqchip in split mode via "-accel kvm,kernel-irqchip= =3Dsplit", + s-mode APLIC will be emulated while using the s-mode IMSIC from the irqc= hip + +The following table summarizes how the AIA and accelerator options defines= what +we will emulate in userspace: + + +.. list-table:: How AIA and accel options changes controller emulation + :widths: 25 25 25 25 25 25 25 + :header-rows: 1 + + * - Accel + - Accel props + - AIA type + - APLIC m-mode + - IMSIC m-mode + - APLIC s-mode + - IMSIC s-mode + * - tcg + - --- + - aplic + - emul + - n/a + - emul + - n/a + * - tcg + - --- + - aplic-imsic + - emul + - emul + - emul + - emul + * - kvm + - --- + - aplic + - n/a + - n/a + - emul + - n/a + * - kvm + - none + - aplic-imsic + - n/a + - n/a + - in-kernel + - in-kernel + * - kvm + - irqchip=3Dsplit + - aplic-imsic + - n/a + - n/a + - emul + - in-kernel diff --git a/docs/system/riscv/virt.rst b/docs/system/riscv/virt.rst index 537aac0340..60850970ce 100644 --- a/docs/system/riscv/virt.rst +++ b/docs/system/riscv/virt.rst @@ -129,6 +129,13 @@ The following machine-specific options are supported: MSIs. When not specified, this option is assumed to be "none" which sele= cts SiFive PLIC to handle wired interrupts. =20 + This option also interacts with '-accel kvm'. When using "aia=3Daplic-i= msic" + with KVM, it is possible to set the use of the kernel irqchip in split m= ode + by using "-accel kvm,kernel-irqchip=3Dsplit". In this case the ``virt``= machine + will emulate the APLIC controller instead of using the APLIC controller = from + the irqchip. See :ref:`riscv-aia` for more details on all available AIA + modes. + - aia-guests=3Dnnn =20 The number of per-HART VS-level AIA IMSIC pages to be emulated for a gue= st --=20 2.47.1