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44b198aee1
On POWER9 and later processors where the host can schedule vcpus on a
per thread basis, there is a streamlined entry path used when the guest
is radix. This entry path saves/restores the fp and vr state in
kvmhv_p9_guest_entry() by calling store_[fp/vr]_state() and
load_[fp/vr]_state(). This is the same as the old entry path however the
old entry path also saved/restored the VRSAVE register, which isn't done
in the new entry path.
This means that the vrsave register is now volatile across guest exit,
which is an incorrect change in behaviour.
Fix this by saving/restoring the vrsave register in kvmhv_p9_guest_entry().
This restores the old, correct, behaviour.
Fixes:
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| include | ||
| init | ||
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| kernel | ||
| lib | ||
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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.