Page MenuHomeFreeBSD

bhyve: rework BAR emulation
AbandonedPublic

Authored by corvink on Jan 22 2021, 9:23 AM.
Tags
Referenced Files
Unknown Object (File)
Thu, Oct 30, 2:59 PM
Unknown Object (File)
Wed, Oct 29, 4:21 PM
Unknown Object (File)
Wed, Oct 29, 1:26 PM
Unknown Object (File)
Wed, Oct 29, 1:23 PM
Unknown Object (File)
Wed, Oct 29, 1:23 PM
Unknown Object (File)
Thu, Oct 9, 2:16 AM
Unknown Object (File)
Oct 1 2025, 6:25 PM
Unknown Object (File)
Sep 25 2025, 10:56 PM

Details

Reviewers
None
Group Reviewers
bhyve
Summary

If the guest writes ~0U to one register of a 64 bit BAR (to read it's size), bhyve registers a BAR with an invalid address. This patch avoids this behaviour.

Additionally, this BAR emulation is required for GVT-d (see D26209) and for GPU Passthrough of AMD graphic cards (see D27456).

Diff Detail

Repository
rG FreeBSD src repository
Lint
Lint Skipped
Unit
Tests Skipped