mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2026-05-10 17:31:37 -04:00
516e5bd0b6
Below is a setup with extended linear cache configuration with an example
layout of memory region shown below presented as a single memory region
consists of 256G memory where there's 128G of DRAM and 128G of CXL memory.
The kernel sees a region of total 256G of system memory.
128G DRAM 128G CXL memory
|-----------------------------------|-------------------------------------|
Data resides in either DRAM or far memory (FM) with no replication. Hot
data is swapped into DRAM by the hardware behind the scenes. When error is
detected in one location, it is possible that error also resides in the
aliased location. Therefore when a memory location that is flagged by MCE
is part of the special region, the aliased memory location needs to be
offlined as well.
Add an mce notify callback to identify if the MCE address location is part
of an extended linear cache region and handle accordingly.
Added symbol export to set_mce_nospec() in x86 code in order to call
set_mce_nospec() from the CXL MCE notify callback.
Link: https://lore.kernel.org/linux-cxl/668333b17e4b2_5639294fd@dwillia2-xfh.jf.intel.com.notmuch/
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Li Ming <ming.li@zohomail.com>
Reviewed-by: Alison Schofield <alison.schofield@intel.com>
Link: https://patch.msgid.link/20250226162224.3633792-5-dave.jiang@intel.com
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
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.