https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=215740
Bug ID: 215740
Summary: [bhyve] utilizing passthru breaks raw device usage
with virtio-blk | ahci-hd
Product: Base System
Version: 11.0-STABLE
Hardware: amd64
OS: Any
Status: New
Severity: Affects Some People
Priority: ---
Component: misc
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
CC: [email protected]
Using a passthru device with bhyve(8) for hosting guests with a physical device
as storage backend (regardless if accessed through virtio-blk or ahci-hd)
corrupts guest-disk access, while file-backed ahci-hd (or virtio-blk) doesn't
show that problem with passthru.
Steps to reproduce:
Use any harddrive containing any installed OS.
On the host: 'hd /dev/ada6 | less'
See MBR/PMBR code.
Use the same device (ada6 in that example) and conncet it to a FreeBSD-Live-DVD
guest with a passthru device involved
(e. g.
bhyveload -d ./releases/ISO-IMAGES/11.0/FreeBSD-11.0-RELEASE-amd64-disc1.iso -S
-m 2G ppttest && bhyve -u -A -H -P -s 0,hostbridge -s
3,ahci,cd:./releases/ISO-IMAGES/11.0/FreeBSD-11.0-RELEASE-amd64-disc1.iso,hd:/dev/ada6
-s 5,passthru,0/25/0 -s 31,lpc -l com1,stdio -S -m 2G -c 4 ppttest
)
Inside the guest, 'hd /dev/ada0 | less' doesn't work anymore (endless I/O)
Using 'dd if=/dev/ada6 count=1 | hd' shows only 0x0 instead of the output you
saw on the host!
Simply repeating this without the passthru device in place solves the problem,
you see exactly the same bytes inside the guest as on the host.
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