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0a5bfb824a
We used to have a workaround[1] for a hang during migration that was
made ineffective when we converted the decrementer expiry to be
relative to guest timebase.
The point of the workaround was that in the absence of an explicit
decrementer expiry value provided by userspace during migration, KVM
needs to initialize dec_expires to a value that will result in an
expired decrementer after subtracting the current guest timebase. That
stops the vcpu from hanging after migration due to a decrementer
that's too large.
If the dec_expires is now relative to guest timebase, its
initialization needs to be guest timebase-relative as well, otherwise
we end up with a decrementer expiry that is still larger than the
guest timebase.
1- https://git.kernel.org/torvalds/c/5855564c8ab2
Fixes:
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| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| 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.