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Julien Grall
a18be06aca
Early version of Cortex-A76 can end-up with corrupt TLBs if they
speculate an AT instruction while the S1/S2 system registers are in an
inconsistent state.
This can happen during guest context switch and when invalidating the
TLBs for other than the current VMID.
The workaround implemented in Xen will:
- Use an empty stage-2 with a reserved VMID while context switching
between 2 guests
- Use an empty stage-2 with the VMID where TLBs need to be flushed
Signed-off-by: Julien Grall <julien.grall@arm.com>
Reviewed-by: Andrii Anisov <andrii_anisov@epam.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
xen-bugtool =========== The xen-bugtool command line application will collate the Xen dmesg output, details of the hardware configuration of your machine, information about the build of Xen that you are using, plus, if you allow it, various logs. The information collated can either be posted to a Xen Bugzilla bug (this bug must already exist in the system, and you must be a registered user there), or it can be saved as a .tar.bz2 for sending or archiving. The collated logs may contain private information, and if you are at all worried about that, you should not use this tool, or you should explicitly exclude those logs from the archive. xen-bugtool is wholly interactive, so simply run it, and answer the questions.