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The eiointc interrupt controller supports 256 interrupt vectors at most, and the interrupt handler gets the interrupt status from the base register group EIOINTC_REG_ISR at the interrupt specific offset. It needs to read the register group EIOINTC_REG_ISR four times to get all 256 interrupt vectors status. Eiointc registers including EIOINTC_REG_ISR are software emulated for VMs, so there will be VM-exits when accessing eiointc registers. Introduce a method to make the eiointc interrupt controller route to different CPU interrupt pins for every 64 interrupt vectors. The interrupt handler can then reduce the read to one specific EIOINTC_REG_ISR register instead of all four, which reduces VM exits. [ tglx: Massage change log ] Signed-off-by: Bibo Mao <maobibo@loongson.cn> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Link: https://lore.kernel.org/all/20250804081946.1456573-3-maobibo@loongson.cn |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
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.