Björn Töpel <bjorn@xxxxxxxxxx> writes: > Anup Patel <apatel@xxxxxxxxxxxxxxxx> writes: > >> The RISC-V AIA specification is ratified as-per the RISC-V international >> process. The latest ratified AIA specifcation can be found at: >> https://github.com/riscv/riscv-aia/releases/download/1.0/riscv-interrupts-1.0.pdf >> >> At a high-level, the AIA specification adds three things: >> 1) AIA CSRs >> - Improved local interrupt support >> 2) Incoming Message Signaled Interrupt Controller (IMSIC) >> - Per-HART MSI controller >> - Support MSI virtualization >> - Support IPI along with virtualization >> 3) Advanced Platform-Level Interrupt Controller (APLIC) >> - Wired interrupt controller >> - In MSI-mode, converts wired interrupt into MSIs (i.e. MSI generator) >> - In Direct-mode, injects external interrupts directly into HARTs >> >> For an overview of the AIA specification, refer the AIA virtualization >> talk at KVM Forum 2022: >> https://static.sched.com/hosted_files/kvmforum2022/a1/AIA_Virtualization_in_KVM_RISCV_final.pdf >> https://www.youtube.com/watch?v=r071dL8Z0yo >> >> To test this series, use QEMU v7.2 (or higher) and OpenSBI v1.2 (or higher). >> >> These patches can also be found in the riscv_aia_v12 branch at: >> https://github.com/avpatel/linux.git >> >> Changes since v11: >> - Rebased on Linux-6.8-rc1 >> - Included kernel/irq related patches from "genirq, irqchip: Convert ARM >> MSI handling to per device MSI domains" series by Thomas. >> (PATCH7, PATCH8, PATCH9, PATCH14, PATCH16, PATCH17, PATCH18, PATCH19, >> PATCH20, PATCH21, PATCH22, PATCH23, and PATCH32 of >> https://lore.kernel.org/linux-arm-kernel/20221121135653.208611233@xxxxxxxxxxxxx/) >> - Updated APLIC MSI-mode driver to use the new WIRED_TO_MSI mechanism. >> - Updated IMSIC driver to support per-device MSI domains for PCI and >> platform devices. > > Thanks for working on this, Anup! I'm still reviewing the patches. > > I'm hitting a boot hang in text patching, with this series applied on > 6.8-rc2. IPI issues? Not text patching! One cpu spinning in smp_call_function_many_cond() and the others are in cpu_relax(). Smells like IPI...
