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8ae8ccd240
[ Upstream commit cb1d220da0faa5ca0deb93449aff953f0c2cce6d ]
If we run the following perf command in an AMD Milan guest:
perf stat \
-e cpu/event=0x1d0/ \
-e cpu/event=0x1c7/ \
-e cpu/umask=0x1f,event=0x18e/ \
-e cpu/umask=0x7,event=0x18e/ \
-e cpu/umask=0x18,event=0x18e/ \
./workload
dmesg will report a #GP warning from an unchecked MSR access
error on MSR_F15H_PERF_CTLx.
This is because according to APM (Revision: 4.03) Figure 13-7,
the bits [35:32] of AMD PerfEvtSeln register is a part of the
event select encoding, which extends the EVENT_SELECT field
from 8 bits to 12 bits.
Opportunistically update pmu->reserved_bits for reserved bit 19.
Reported-by: Jim Mattson <jmattson@google.com>
Fixes:
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| README | ||
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.