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eeebbde571
This currently calls set_memory_x() from machine_kexec_prepare() just like the 32-bit version does. That's actually a bit earlier than I'd like, as it leaves the page RWX all the time the image is even *loaded*. Subsequent commits will eliminate all the writes to the page between the point it's marked executable in machine_kexec_prepare() the time that relocate_kernel() is running and has switched to the identmap %cr3, so that it can be ROX. But that can't happen until it's moved to the .data section of the kernel, and *that* can't happen until we start executing the copy instead of executing it in place in the kernel .text. So break the circular dependency in those commits by letting it be RWX for now. Signed-off-by: David Woodhouse <dwmw@amazon.co.uk> Signed-off-by: Ingo Molnar <mingo@kernel.org> Cc: Baoquan He <bhe@redhat.com> Cc: Vivek Goyal <vgoyal@redhat.com> Cc: Dave Young <dyoung@redhat.com> Cc: Eric Biederman <ebiederm@xmission.com> Cc: Ard Biesheuvel <ardb@kernel.org> Cc: "H. Peter Anvin" <hpa@zytor.com> Link: https://lore.kernel.org/r/20241205153343.3275139-8-dwmw2@infradead.org |
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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.