Date: Mon, 21 Dec 2015 20:44:57 -0700 From: Sergey Manucharian <sm@ara-ler.com> To: FreeBSD virtualization <freebsd-virtualization@freebsd.org> Subject: Re: bhyve PCI pass-through to Linux guest Message-ID: <20151222034457.GA40078@dendrobates.araler.com> In-Reply-To: <5678BECC.7090200@freebsd.org> References: <20151220045821.GG22018@dendrobates.araler.com> <56763672.3090207@freebsd.org> <20151220051015.GH22018@dendrobates.araler.com> <56763A0B.8010802@freebsd.org> <20151220053644.GI22018@dendrobates.araler.com> <20151220215240.GB4064@dendrobates.araler.com> <5678BECC.7090200@freebsd.org>
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Excerpts from Peter Grehan's message from Tue 22-Dec-15 13:09: > Hi Sergey, > > > This is pretty reproducible: > > > > I pass trough a PCI device (USB controller) to a Linux guest. It works > > properly. Then I halt the VM, make sure that bhyve destroyed it and run > > Windows guest with the same PCI device passed-through. > > > > Windows device manager does show the device, however, e.g. a flash drive > > plugged in is not presented to Windows, instead it's being processed by > > FreeBSD. > > > > After that it does not work in Linux guest as well. Kernel module (vmm) > > unloading and reloading does not help. > > The flash drive being processed by FreeBSD would indicate that it has > ownership of the device. Would you be able to try a 'pciconf -vl' after > the Linux guest exists, and after the Windows guest exits ? OK, I've experimented more and found that even with the same Linux VM after halting it once, the pass-through device doesn't work when that Linux guest is restarted again. It looks that both host and guest report exactly the same data before and after restarting the guest: Linux - first run: ================= $ lspci -v 00:07.0 USB controller: Intel Corporation 7 Series/C210 Series Chipset Family USB xHCI Host Controller (rev 04) (prog-if 30 [XHCI]) Subsystem: Lenovo Device 21f3 Flags: bus master, medium devsel, latency 0, IRQ 24 Memory at c0010000 (64-bit, prefetchable) [size=64K] Capabilities: [70] Power Management version 2 Capabilities: [80] MSI: Enable+ Count=1/8 Maskable- 64bit+ Kernel driver in use: xhci_hcd $ lsusb Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 001 Device 002: ID 0781:5530 SanDisk Corp. Cruzer Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub FreeBSD when Linux is running first time: ========================================= $ pciconf -v ppt0@pci0:0:20:0: class=0x0c0330 card=0x21f317aa chip=0x1e318086 rev=0x04 hdr=0x00 vendor = 'Intel Corporation' device = '7 Series/C210 Series Chipset Family USB xHCI Host Controller' class = serial bus subclass = USB Linux - second run: =================== $ lspci -v 00:07.0 USB controller: Intel Corporation 7 Series/C210 Series Chipset Family USB xHCI Host Controller (rev 04) (prog-if 30 [XHCI]) Subsystem: Lenovo Device 21f3 Flags: bus master, medium devsel, latency 0, IRQ 24 Memory at c0010000 (64-bit, prefetchable) [size=64K] Capabilities: [70] Power Management version 2 Capabilities: [80] MSI: Enable+ Count=1/8 Maskable- 64bit+ Kernel driver in use: xhci_hcd FreeBSD when Linux is running second time: ========================================== $ pciconf -lv ppt0@pci0:0:20:0: class=0x0c0330 card=0x21f317aa chip=0x1e318086 rev=0x04 hdr=0x00 vendor = 'Intel Corporation' device = '7 Series/C210 Series Chipset Family USB xHCI Host Controller' class = serial bus subclass = USB -- Thanks, Sergey
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