Page MenuHomeFreeBSD

bhyve: rework BAR emulation
AbandonedPublic

Authored by corvink on Jan 22 2021, 9:23 AM.
Tags
Referenced Files
Unknown Object (File)
Wed, Sep 18, 6:27 AM
Unknown Object (File)
Sun, Sep 15, 1:35 AM
Unknown Object (File)
Sun, Sep 8, 10:10 AM
Unknown Object (File)
Sun, Sep 8, 8:42 AM
Unknown Object (File)
Sat, Sep 7, 7:44 AM
Unknown Object (File)
Sun, Sep 1, 10:56 AM
Unknown Object (File)
Sun, Sep 1, 10:56 AM
Unknown Object (File)
Wed, Aug 28, 1:53 AM

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