Bezüglich Harry Schmalzbauer's Nachricht vom 29.10.2016 19:35 (localtime): > Bezüglich Harry Schmalzbauer's Nachricht vom 29.10.2016 17:32 (localtime): > > … >> Like mentioned, while reading the first 448 bytes on the host, I get >> identical results from /usr/local/guest.img and /dev/ada4, but when >> attaching /dev/ada4 to ahci-hd (-s 7,ahci-hd,/dev/ada4) and inspecting >> inside vmm, all I see is 0x0, while ahci-hd attached >> /usr/local/guest.img shows the same pmbr as on the host!? >> >> Do I have to exclude /dev/ada4 on the host from geom? As soon as bhyve >> opens /dev/ada4, all partitions vanish from the host – probably ada4 >> itself gets blocked somehow? … > Just another symptom I can only describe, not debug: > Opening /dev/adaX on the host works by 'hd /dev/ada4 | less', > but not inside the guest, where it just leads to endless IO when trying > the same on the ahci-hd attached /dev/ada4
The described defects only happen when passthru is used with bhyve(8)!!! If I simply don't attach the passthru-device (keeping memory wired), everything works the way it's supposed to do. Opening the guest-ada1-device with hexdump works, geom tastes GPT and the first 448 bytes show exactly the pMBR like on the host. As soon as I start the guest with the passthru device (doesn't matter which slot, tested with a 82574L), the ahci-hd can't be read nymore, just returning 0x0 when dumped. Shall I file a bug report? Anybody aware of that or any idea where to start fixing? To summarize: FreeBSD-11-RELEASE hosting a bhyve(8) guest with a physical device as storage backend (regardless if accessed through virtio-blk or ahci-hd) corrupts guest-disk access if there's also a passthrough device attached. If you use a file-backed ahci-hd (or virtio-blk) device, the problem doesn't show up, regardelss if there's passthru involved or not. Thanks, -Harry _______________________________________________ freebsd-stable@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "freebsd-stable-unsubscr...@freebsd.org"
