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3496d1c64a
RESET_CALL_DEPTH is a pretty fat monster and blows up UNTRAIN_RET to 20 bytes: 19: 48 c7 c0 80 00 00 00 mov $0x80,%rax 20: 48 c1 e0 38 shl $0x38,%rax 24: 65 48 89 04 25 00 00 00 00 mov %rax,%gs:0x0 29: R_X86_64_32S pcpu_hot+0x10 Shrink it by 4 bytes: 0: 31 c0 xor %eax,%eax 2: 48 0f ba e8 3f bts $0x3f,%rax 7: 65 48 89 04 25 00 00 00 00 mov %rax,%gs:0x0 Shrink RESET_CALL_DEPTH_FROM_CALL by 5 bytes by only setting %al, the other bits are shifted out (the same could be done for RESET_CALL_DEPTH, but the XOR+BTS sequence has less dependencies due to the zeroing). Suggested-by: Andrew Cooper <andrew.cooper3@citrix.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de> Link: https://lore.kernel.org/r/20230515093020.729622326@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 Restructured Text 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.