This series paves the way to run Linux in so-called non-root cells (guest partitions) of the Jailhouse hypervisor.
Jailhouse [1] was started 4 years ago as an open-source (GPL) leight- weight hypervisor that statically partitions SMP systems. It's unique in that it uses one Linux instance, the root cell, as boot loader and management console. Jailhouse targets use cases for hard real-time and safety-critical systems that KVM cannot cater due to its inherent complexity. Jaihouse can run bare-metal, free and closed-source RTOSes as secondary guests and, with this series, also x86 Linux instances. While ARM and ARM64 non-root Linux guests are feasible without extra patches, thanks to the high configurability via device trees, x86 requires special platform support, mostly to step away from non-existing resources in a non-root Jailhouse cell. This series ensures that Linux can boot in a non-root cell, including SMP cells, has working timekeeping and can use the platform UARTs and PCI devices as assigned to it. In follow-up series, we will propose optimizations and enhancements for the PCI support, a simplistic debug console, and some improvement for Linux guests on ARM. What is not yet in upstream-ready state is a driver for inter-cell communication. The current implementation of virtual peer-to-peer network [2] uses an enhanced version of the QEMU ivshmem shared memory device. However we still need to finish the evaluation of virtio / vhost-pci options prior to settling over the final interface. This patch series is also available at git://git.kiszka.org/linux.git d0036688b2da Jan [1] http://jailhouse-project.org [2] http://git.kiszka.org/?p=linux.git;a=shortlog;h=refs/heads/queues/jailhouse Jan Kiszka (10): x86/apic: Install an empty physflat_init_apic_ldr x86: jailhouse: Add infrastructure for running in non-root cell x86: jailhouse: Enable APIC and SMP support x86: jailhouse: Enable PMTIMER x86: jailhouse: Set up timekeeping x86: jailhouse: Avoid access of unsupported platform resources x86: jailhouse: Silence ACPI warning x86: jailhouse: Halt instead of failing to restart x86: jailhouse: Wire up IOAPIC for legacy UART ports x86: jailhouse: Initialize PCI support arch/x86/Kconfig | 13 ++ arch/x86/include/asm/hypervisor.h | 1 + arch/x86/include/asm/jailhouse_para.h | 27 ++++ arch/x86/include/asm/tsc.h | 3 + arch/x86/kernel/Makefile | 2 + arch/x86/kernel/apic/apic_flat_64.c | 12 +- arch/x86/kernel/cpu/hypervisor.c | 4 + arch/x86/kernel/jailhouse.c | 252 ++++++++++++++++++++++++++++++++++ arch/x86/kernel/smpboot.c | 7 +- arch/x86/kernel/tsc.c | 14 +- drivers/acpi/Kconfig | 32 ++--- 11 files changed, 339 insertions(+), 28 deletions(-) create mode 100644 arch/x86/include/asm/jailhouse_para.h create mode 100644 arch/x86/kernel/jailhouse.c -- 2.12.3
