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The typical I/O interrupts in non-root cells are MSI-based. However, the platform UARTs do not support MSI. In order to run a non-root cell that shall use one of them, the standard IOAPIC must be registered and 1:1 routing for IRQ 3 and 4 set up. If an IOAPIC is not available, the boot loader clears standard_ioapic in the setup data, so registration is skipped. If the guest is not allowed to to use one of those pins, Jailhouse will simply ignore the access. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: jailhouse-dev@googlegroups.com Link: https://lkml.kernel.org/r/90d942dda9d48a8046e00bb3c1bb6757c83227be.1511770314.git.jan.kiszka@siemens.com |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.