Date: Tue, 03 Jan 2017 16:47:31 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 215740] [bhyve] utilizing passthru breaks raw device usage with virtio-blk | ahci-hd Message-ID: <bug-215740-8@https.bugs.freebsd.org/bugzilla/>
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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: freebsd-bugs@FreeBSD.org Reporter: bugzilla.freebsd@omnilan.de CC: freebsd-amd64@FreeBSD.org CC: freebsd-amd64@FreeBSD.org 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. -- You are receiving this mail because: You are the assignee for the bug.
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