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Re: [Qemu-devel] [Question] Why doesn't PCIe hotplug work for Q35 machin
From: |
Marcel Apfelbaum |
Subject: |
Re: [Qemu-devel] [Question] Why doesn't PCIe hotplug work for Q35 machine? |
Date: |
Sun, 17 Aug 2014 14:28:17 +0300 |
On Sun, 2014-08-17 at 13:00 +0200, Michael S. Tsirkin wrote:
> On Fri, Aug 15, 2014 at 07:33:29AM +0000, Gonglei (Arei) wrote:
> > Hi,
> >
> > I noticed that the qemu-2.1 release change log says
> > " PCIe: Basic hot-plug/hot-unplug support for Q35 machine."
> > And then I made a testing for the hotplugging function of Q35.
> > But I'm failed, and I got the dmesg log in guest os as below:
> >
> > [ 159.035250] Pciehp 0000:05:00.0:pcie24: Button pressed on Slot (0 - 4)
> > [ 159.035274] Pciehp 0000:05:00.0:pcie24: Card present on Slot (0 - 4)
> > [ 159.036517] Pciehp 0000:05:00.0:pcie24: PCI slot #0 - 4 - powering on due
> > to button press.
> > [ 159.188049] Pciehp 0000:05:00.0:pcie24: Failed to check link status
> > [ 159.201968] Pciehp 0000:05:00.0:pcie24: Card not present on Slot (0 - 4)
> > [ 159.202529] Pciehp 0000:05:00.0:pcie24: Already disabled on Slot (0 - 4)
> >
> > Steps of testing:
> >
> > #1. QEMU version:
> >
> > The lateset master tree source.
> >
> > #2. Command line:
> >
> > ./qemu-system-x86_64 -enable-kvm -m 2048 -machine q35 -device
> > ide-drive,bus=ide.2,drive=MacHDD \
> > -drive id=MacHDD,if=none,file=/mnt/sdb/gonglei/image/redhat_q35.img
> > -monitor stdio -vnc :10 -readconfig ../docs/q35-chipset.cfg
> > QEMU 2.0.93 monitor - type 'help' for more information
> > (qemu) device_add
> > virtio-net-pci,id=nic2,bus=pcie-switch-downstream-port-1-1,addr=1.0
>
> I don't think you can use any slot except slot 0 for pci express.
Indeed, only slot 0 can be used, try the same without specifying the addr
property.
> > (qemu) info network
> > hub 0
> > \ user.0: index=0,type=user,net=10.0.2.0,restrict=off
> > \ e1000.0: index=0,type=nic,model=e1000,macaddr=52:54:00:12:34:56
> >
> > #3. Guest OS:
> >
> > Both rhel-server-7.0-x86_64 and SLES-11-SP3-DVD-x86_64-GM.
> >
> > #4. Content of ../docs/q35-chipset.cfg:
> >
> > [snip]
> >
> > ##
> > # Example PCIe switch with two downstream ports
> > #
> > [device "pcie-switch-upstream-port-1"]
> > driver = "x3130-upstream"
> > bus = "ich9-pcie-port-4"
> > addr = "00.0"
> >
> > [device "pcie-switch-downstream-port-1-1"]
> > driver = "xio3130-downstream"
> > multifunction = "on"
> > bus = "pcie-switch-upstream-port-1"
> > addr = "00.0"
> > port = "1"
> > chassis = "5"
> >
> > [device "pcie-switch-downstream-port-1-2"]
> > driver = "xio3130-downstream"
> > multifunction = "on"
> > bus = "pcie-switch-upstream-port-1"
> > addr = "00.1"
> > port = "1"
> > chassis = "6"
> >
> > [device "ich9-ehci-1"]
> > driver = "ich9-usb-ehci1"
> > multifunction = "on"
> > bus = "pcie.0"
> > addr = "1d.7"
> >
> > [snip]
> >
> > BTW, except testing hotplug of downstream ports, I also test the root port
> > with "device_add virtio-net-pci,id=nic2,bus=ich9-pcie-port-1,addr=1.0", but
> > I got the same result.
>
> Same thing.
Agreed, and also make sure that ich9-pcie-port-1 is a root port's bus and not
an upstream port's bus.
Thanks,
Marcel
>
> > Am I wrong in some places? Or a QEMU bug? Thanks for any help.
> >
> > Best regards,
> > -Gonglei
> >
>
> We might want to add a check for this, to produce a
> better error message.
>
- [Qemu-devel] [Question] Why doesn't PCIe hotplug work for Q35 machine?, Gonglei (Arei), 2014/08/15
- Re: [Qemu-devel] [Question] Why doesn't PCIe hotplug work for Q35 machine?, Michael S. Tsirkin, 2014/08/17
- Re: [Qemu-devel] [Question] Why doesn't PCIe hotplug work for Q35 machine?,
Marcel Apfelbaum <=
- Re: [Qemu-devel] [Question] Why doesn't PCIe hotplug work for Q35 machine?, Gonglei (Arei), 2014/08/18
- Re: [Qemu-devel] [Question] Why doesn't PCIe hotplug work for Q35 machine?, Paolo Bonzini, 2014/08/18
- Re: [Qemu-devel] [Question] Why doesn't PCIe hotplug work for Q35 machine?, Gonglei (Arei), 2014/08/19
- Re: [Qemu-devel] [Question] Why doesn't PCIe hotplug work for Q35 machine?, Paolo Bonzini, 2014/08/19
- Re: [Qemu-devel] [Question] Why doesn't PCIe hotplug work for Q35 machine?, Gonglei (Arei), 2014/08/19
- Re: [Qemu-devel] [Question] Why doesn't PCIe hotplug work for Q35 machine?, Michael S. Tsirkin, 2014/08/19
- Re: [Qemu-devel] [Question] Why doesn't PCIe hotplug work for Q35 machine?, Gonglei (Arei), 2014/08/19
- Re: [Qemu-devel] [Question] Why doesn't PCIe hotplug work for Q35 machine?, Knut Omang, 2014/08/20
- Re: [Qemu-devel] [Question] Why doesn't PCIe hotplug work for Q35 machine?, Knut Omang, 2014/08/20
- Re: [Qemu-devel] [Question] Why doesn't PCIe hotplug work for Q35 machine?, Gonglei (Arei), 2014/08/20