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As the comment already stated, there is no need for setting up LDR (and DFR) in physflat mode as it remains unused (see SDM, 10.6.2.1). flat_init_apic_ldr only served as a placeholder for a nop operation so far, causing no harm. That will change when running over the Jailhouse hypervisor. Here we must not touch LDR in a way that destroys the mapping originally set up by the Linux root cell. Jailhouse enforces this setting in order to efficiently validate any IPI requests sent by a cell. Avoid a needless clash caused by flat_init_apic_ldr by installing a true nop handler. 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/f9867d294cdae4d45ed89d3a2e6adb524f4f6794.1511770314.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.