On 1/14/22 3:42 AM, Emmanuel Vadot wrote:
The branch main has been updated by manu:
URL:
https://cgit.FreeBSD.org/src/commit/?id=6171e026be11824495cebe8baf559af673a8e533
commit 6171e026be11824495cebe8baf559af673a8e533
Author: Corvin Köhne <corv...@beckhoff.com>
AuthorDate: 2022-01-14 09:58:48 +0000
Commit: Emmanuel Vadot <m...@freebsd.org>
CommitDate: 2022-01-14 11:41:44 +0000
bhyve: add support for MTRR
Some guests or driver might depend on MTRR to work properly. E.g. the
nvidia gpu driver won't work without MTRR.
Reviewed by: markj
MFC after: 2 weeks
Sponsored by: Beckhoff Automation GmbH & Co. KG
Differential Revision: https://reviews.freebsd.org/D33333
So this doesn't look like actual emulation, but more like a dummy version?
That is, the values aren't initialized to the "normal" state (WB for guest RAM,
UC- for everything else), and the state isn't enforced in any way (I think the
only sane way to actually implement these would be to use MTRR to set PAT values
in EPT entries if EPT even supports PAT). Perhaps this mostly doesn't matter
since we don't directly map BARs in EPT anyway? (Though perhaps for passthrough
we might in which case you'd want to honor these settings in those?)
--
John Baldwin
