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Differential D45342

bhyve: protect MMIO mapped BDSM register
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Authored by corvink on May 24 2024, 11:35 AM.
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F164486670: D45342.diff
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rgrimes

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jhb
markj
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bhyve
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rG6374c45fbaf7: bhyve: protect MMIO mapped BDSM register
Summary

The Windows graphics driver reads the value of the BDSM register from MMIO
space. This value makes no sense in our virtual environment because it's a host
address. Therefore, we have to trap and emulate it.

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rG FreeBSD src repository
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Tests Not Applicable

Event Timeline

corvink created this revision.May 24 2024, 11:35 AM
Herald added subscribers: bcran, rgrimes, imp. · View Herald TranscriptMay 24 2024, 11:35 AM
corvink requested review of this revision.May 24 2024, 11:35 AM
Harbormaster completed remote builds in B57898: Diff 139039.May 24 2024, 11:35 AM
corvink added a parent revision: D45341: bhyve: add interface to protect BAR regions of passthru devices.May 24 2024, 11:35 AM
corvink updated this revision to Diff 156886.Jun 12 2025, 1:46 PM
  • rebase onto main
Harbormaster completed remote builds in B64803: Diff 156886.Jun 12 2025, 1:46 PM
markj added inline comments.Jun 17 2025, 12:38 PM
usr.sbin/bhyve/amd64/pci_gvt-d.c
67

The indentation of the case labels should be the same as the indentation of switch. .clang-format has IndentCaseLabels: false for this.

91

Is it correct that the offset is the same for both writes?

corvink updated this revision to Diff 157504.Jun 24 2025, 6:27 AM
  • fix style issue
  • use correct offset for 64 bit BDSM read/writes
Harbormaster completed remote builds in B65041: Diff 157504.Jun 24 2025, 6:27 AM
corvink marked 2 inline comments as done.Jun 24 2025, 6:27 AM
corvink updated this revision to Diff 157703.Jun 27 2025, 7:41 AM
  • use uint64_t instead of vm_* types
  • account for new handler interface (including baridx)
Harbormaster completed remote builds in B65117: Diff 157703.Jun 27 2025, 7:41 AM
jhb accepted this revision.Jun 30 2025, 6:32 PM
jhb added inline comments.
usr.sbin/bhyve/amd64/pci_gvt-d.c
126

Maybe add a #define for this magic number to document it a bit more?

This revision is now accepted and ready to land.Jun 30 2025, 6:32 PM
Closed by commit rG6374c45fbaf7: bhyve: protect MMIO mapped BDSM register (authored by corvink). · Explain WhyAug 5 2025, 2:04 PM
This revision was automatically updated to reflect the committed changes.
corvink added a commit: rG6374c45fbaf7: bhyve: protect MMIO mapped BDSM register.

Revision Contents
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PathSize
usr.sbin/
bhyve/
amd64/
45 lines

Diff 159779

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usr.sbin/bhyve/amd64/pci_gvt-d.c

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