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Bug 1358665

Summary: [Q35] Disk which connected to pci bridge didn't be found in guest with q35 machine type
Product: Red Hat Enterprise Linux 7 Reporter: jingzhao <jinzhao>
Component: qemu-kvm-rhevAssignee: Marcel Apfelbaum <marcel>
Status: CLOSED NOTABUG QA Contact: jingzhao <jinzhao>
Severity: low Docs Contact:
Priority: low    
Version: 7.3CC: chayang, jinzhao, juzhang, knoel, lersek, virt-maint, yduan, yiwei
Target Milestone: rc   
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard:
Fixed In Version: Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2016-08-14 13:54:07 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Attachments:
Description Flags
The seabios log
none
the dmesg log of guest none

Description jingzhao 2016-07-21 08:43:07 UTC 
Description of problem:
Disk which connected to pci bridge didn't be found in guest with q35 machine type

Version-Release number of selected component (if applicable):
host kernel:3.10.0-470.el7.x86_64
qemu-kvm-rhev-2.6.0-14.el7.x86_64
seabios-1.9.1-4.el7.x86_64

guest kernel:3.10.0-470.el7.x86_64

How reproducible:
3/3

Steps to Reproduce:
1. Boot guest with following cli:
/usr/libexec/qemu-kvm \
-M q35 \
-cpu SandyBridge \
-nodefaults -rtc base=utc \
-m 4G \
-smp 2,sockets=2,cores=1,threads=1 \
-enable-kvm \
-name rhel7.3 \
-uuid 990ea161-6b67-47b2-b803-19fb01d30d12 \
-smbios type=1,manufacturer='Red Hat',product='RHEV Hypervisor',version=el6,serial=koTUXQrb,uuid=feebc8fd-f8b0-4e75-abc3-e63fcdb67170 \
-k en-us \
-serial unix:/tmp/serial0,server,nowait \
-boot menu=on \
-bios /usr/share/seabios/bios.bin \
-chardev file,path=/home/seabios.log,id=seabios \
-device isa-debugcon,chardev=seabios,iobase=0x402 \
-qmp tcp::8887,server,nowait \
-vga qxl \
-spice port=5932,disable-ticketing \
-device ioh3420,id=root.0,slot=1 \
-drive file=/home/q35.qcow2,if=none,id=drive-virtio-disk0,format=qcow2,cache=none,werror=stop,rerror=stop \
-device virtio-blk-pci,bus=root.0,drive=drive-virtio-disk0,id=virtio-disk0,disable-legacy=on,disable-modern=off,bootindex=1 \
-device i82801b11-bridge,bus=pcie.0,id=bridge1 \
-device pci-bridge,bus=bridge1,id=bridge2,chassis_nr=1 \
-drive file=/home/pci-block1.qcow2,if=none,id=pci-block1,format=qcow2,cache=none,werror=stop,rerror=stop \
-device virtio-blk-pci,bus=bridge2,drive=pci-block1,id=pciblock1,addr=0x6.1 \
-device ioh3420,id=root.2,slot=3 \
-device virtio-net-pci,bus=root.2,netdev=tap10,mac=9a:6a:6b:6c:6d:6e,disable-legacy=on,disable-modern=off -netdev tap,id=tap10 \
-monitor stdio \

2. check the block info through hmp
(qemu) info pci
  Bus  0, device   0, function 0:
    Host bridge: PCI device 8086:29c0
      id ""
  Bus  0, device   1, function 0:
    VGA controller: PCI device 1b36:0100
      IRQ 10.
      BAR0: 32 bit memory at 0xf4000000 [0xf7ffffff].
      BAR1: 32 bit memory at 0xf8000000 [0xfbffffff].
      BAR2: 32 bit memory at 0xfc810000 [0xfc811fff].
      BAR3: I/O at 0xd040 [0xd05f].
      BAR6: 32 bit memory at 0xffffffffffffffff [0x0000fffe].
      id ""
  Bus  0, device   2, function 0:
    PCI bridge: PCI device 8086:3420
      BUS 0.
      secondary bus 1.
      subordinate bus 1.
      IO range [0x1000, 0x1fff]
      memory range [0xfc600000, 0xfc7fffff]
      prefetchable memory range [0xfe000000, 0xfe7fffff]
      id "root.0"
  Bus  1, device   0, function 0:
    SCSI controller: PCI device 1af4:1042
      IRQ 11.
      BAR1: 32 bit memory at 0xfc600000 [0xfc600fff].
      BAR4: 64 bit prefetchable memory at 0xfe000000 [0xfe7fffff].
      id "virtio-disk0"
  Bus  0, device   3, function 0:
    PCI bridge: PCI device 8086:244e
      BUS 0.
      secondary bus 2.
      subordinate bus 3.
      IO range [0xc000, 0xcfff]
      memory range [0xfc000000, 0xfc3fffff]
      prefetchable memory range [0xfe800000, 0xfe9fffff]
      id "bridge1"
  Bus  2, device   0, function 0:
    PCI bridge: PCI device 1b36:0001
      IRQ 11.
      BUS 2.
      secondary bus 3.
      subordinate bus 3.
      IO range [0xc000, 0xcfff]
      memory range [0xfc000000, 0xfc1fffff]
      prefetchable memory range [0xfe800000, 0xfe9fffff]
      BAR0: 64 bit memory at 0xfc200000 [0xfc2000ff].
      id "bridge2"
  Bus  3, device   6, function 1:
    SCSI controller: PCI device 1af4:1001
      IRQ 0.
      BAR0: I/O at 0xffffffffffffffff [0x003e].
      BAR1: 32 bit memory at 0xffffffffffffffff [0x00000ffe].
      id "pciblock1"
  Bus  0, device   4, function 0:
    PCI bridge: PCI device 8086:3420
      BUS 0.
      secondary bus 4.
      subordinate bus 4.
      IO range [0x2000, 0x2fff]
      memory range [0xfc400000, 0xfc5fffff]
      prefetchable memory range [0xfd800000, 0xfdffffff]
      id "root.2"
  Bus  4, device   0, function 0:
    Ethernet controller: PCI device 1af4:1041
      IRQ 10.
      BAR1: 32 bit memory at 0xfc440000 [0xfc440fff].
      BAR4: 64 bit prefetchable memory at 0xfd800000 [0xfdffffff].
      BAR6: 32 bit memory at 0xffffffffffffffff [0x0003fffe].
      id ""
  Bus  0, device  31, function 0:
    ISA bridge: PCI device 8086:2918
      id ""
  Bus  0, device  31, function 2:
    SATA controller: PCI device 8086:2922
      IRQ 10.
      BAR4: I/O at 0xd060 [0xd07f].
      BAR5: 32 bit memory at 0xfc812000 [0xfc812fff].
      id ""
  Bus  0, device  31, function 3:
    SMBus: PCI device 8086:2930
      IRQ 10.
      BAR4: I/O at 0x0700 [0x073f].
      id ""
(qemu) info qtree
bus: main-system-bus
  type System
  dev: kvm-ioapic, id ""
    gpio-in "" 24
    gsi_base = 0 (0x0)
    mmio 00000000fec00000/0000000000001000
  dev: q35-pcihost, id ""
    MCFG = 2952790016 (0xb0000000)
    pci-hole64-size = 0 (0 B)
    short_root_bus = 0 (0x0)
    bus: pcie.0
      type PCIE
      dev: ioh3420, id "root.2"
        power_controller_present = true
        chassis = 0 (0x0)
        slot = 3 (0x3)
        port = 0 (0x0)
        aer_log_max = 8 (0x8)
        addr = 04.0
        romfile = ""
        rombar = 1 (0x1)
        multifunction = false
        command_serr_enable = true
        class PCI bridge, addr 00:04.0, pci id 8086:3420 (sub 0000:0000)
        bus: root.2
          type PCIE
          dev: virtio-net-pci, id ""
            ioeventfd = false
            vectors = 3 (0x3)
            virtio-pci-bus-master-bug-migration = false
            disable-legacy = true
            disable-modern = false
            migrate-extra = true
            modern-pio-notify = false
            x-disable-pcie = false
            addr = 00.0
            romfile = "pxe-virtio.rom"
            rombar = 1 (0x1)
            multifunction = false
            command_serr_enable = true
            class Ethernet controller, addr 04:00.0, pci id 1af4:1041 (sub 1af4:1100)
            bar 1: mem at 0xfc440000 [0xfc440fff]
            bar 4: mem at 0xfd800000 [0xfdffffff]
            bar 6: mem at 0xffffffffffffffff [0x3fffe]
            bus: virtio-bus
              type virtio-pci-bus
              dev: virtio-net-device, id ""
                csum = true
                guest_csum = true
                gso = true
                guest_tso4 = true
                guest_tso6 = true
                guest_ecn = true
                guest_ufo = true
                guest_announce = true
                host_tso4 = true
                host_tso6 = true
                host_ecn = true
                host_ufo = true
                mrg_rxbuf = true
                status = true
                ctrl_vq = true
                ctrl_rx = true
                ctrl_vlan = true
                ctrl_rx_extra = true
                ctrl_mac_addr = true
                ctrl_guest_offloads = true
                mq = false
                mac = "9a:6a:6b:6c:6d:6e"
                vlan = <null>
                netdev = "tap10"
                x-txtimer = 150000 (0x249f0)
                x-txburst = 256 (0x100)
                tx = ""
                indirect_desc = true
                event_idx = true
                notify_on_empty = true
                any_layout = true
      dev: i82801b11-bridge, id "bridge1"
        addr = 03.0
        romfile = ""
        rombar = 1 (0x1)
        multifunction = false
        command_serr_enable = true
        class PCI bridge, addr 00:03.0, pci id 8086:244e (sub 0000:0000)
        bus: bridge1
          type PCI
          dev: pci-bridge, id "bridge2"
            chassis_nr = 1 (0x1)
            msi = true
            shpc = true
            addr = 00.0
            romfile = ""
            rombar = 1 (0x1)
            multifunction = false
            command_serr_enable = true
            class PCI bridge, addr 02:00.0, pci id 1b36:0001 (sub 0000:0000)
            bar 0: mem at 0xfc200000 [0xfc2000ff]
            bus: bridge2
              type PCI
              dev: virtio-blk-pci, id "pciblock1"
                class = 0 (0x0)
                ioeventfd = true
                vectors = 2 (0x2)
                virtio-pci-bus-master-bug-migration = false
                disable-legacy = false
                disable-modern = true
                migrate-extra = true
                modern-pio-notify = false
                x-disable-pcie = false
                addr = 06.1
                romfile = ""
                rombar = 1 (0x1)
                multifunction = false
                command_serr_enable = true
                class SCSI controller, addr 03:06.1, pci id 1af4:1001 (sub 1af4:0002)
                bar 0: i/o at 0xffffffffffffffff [0x3e]
                bar 1: mem at 0xffffffffffffffff [0xffe]
                bus: virtio-bus
                  type virtio-pci-bus
                  dev: virtio-blk-device, id ""
                    drive = "pci-block1"
                    logical_block_size = 512 (0x200)
                    physical_block_size = 512 (0x200)
                    min_io_size = 0 (0x0)
                    opt_io_size = 0 (0x0)
                    discard_granularity = 4294967295 (0xffffffff)
                    cyls = 2080 (0x820)
                    heads = 16 (0x10)
                    secs = 63 (0x3f)
                    serial = ""
                    config-wce = true
                    scsi = false
                    request-merging = true
                    indirect_desc = true
                    event_idx = true
                    notify_on_empty = true
                    any_layout = false
      dev: ioh3420, id "root.0"
        power_controller_present = true
        chassis = 0 (0x0)
        slot = 1 (0x1)
        port = 0 (0x0)
        aer_log_max = 8 (0x8)
        addr = 02.0
        romfile = ""
        rombar = 1 (0x1)
        multifunction = false
        command_serr_enable = true
        class PCI bridge, addr 00:02.0, pci id 8086:3420 (sub 0000:0000)
        bus: root.0
          type PCIE
          dev: virtio-blk-pci, id "virtio-disk0"
            class = 0 (0x0)
            ioeventfd = true
            vectors = 2 (0x2)
            virtio-pci-bus-master-bug-migration = false
            disable-legacy = true
            disable-modern = false
            migrate-extra = true
            modern-pio-notify = false
            x-disable-pcie = false
            addr = 00.0
            romfile = ""
            rombar = 1 (0x1)
            multifunction = false
            command_serr_enable = true
            class SCSI controller, addr 01:00.0, pci id 1af4:1042 (sub 1af4:1100)
            bar 1: mem at 0xfc600000 [0xfc600fff]
            bar 4: mem at 0xfe000000 [0xfe7fffff]
            bus: virtio-bus
              type virtio-pci-bus
              dev: virtio-blk-device, id ""
                drive = "drive-virtio-disk0"
                logical_block_size = 512 (0x200)
                physical_block_size = 512 (0x200)
                min_io_size = 0 (0x0)
                opt_io_size = 0 (0x0)
                discard_granularity = 4294967295 (0xffffffff)
                cyls = 16383 (0x3fff)
                heads = 16 (0x10)
                secs = 63 (0x3f)
                serial = ""
                config-wce = true
                scsi = false
                request-merging = true
                indirect_desc = true
                event_idx = true
                notify_on_empty = true
                any_layout = true
      dev: qxl-vga, id ""
        ram_size = 67108864 (0x4000000)
        vram_size = 67108864 (0x4000000)
        revision = 4 (0x4)
        debug = 0 (0x0)
        guestdebug = 0 (0x0)
        cmdlog = 0 (0x0)
        ram_size_mb = 4294967295 (0xffffffff)
        vram_size_mb = 4294967295 (0xffffffff)
        vram64_size_mb = 4294967295 (0xffffffff)
        vgamem_mb = 16 (0x10)
        surfaces = 1024 (0x400)
        addr = 01.0
        romfile = "vgabios-qxl.bin"
        rombar = 1 (0x1)
        multifunction = false
        command_serr_enable = true
        class VGA controller, addr 00:01.0, pci id 1b36:0100 (sub 1af4:1100)
        bar 0: mem at 0xf4000000 [0xf7ffffff]
        bar 1: mem at 0xf8000000 [0xfbffffff]
        bar 2: mem at 0xfc810000 [0xfc811fff]
        bar 3: i/o at 0xd040 [0xd05f]
        bar 6: mem at 0xffffffffffffffff [0xfffe]
      dev: ICH9 SMB, id ""
        addr = 1f.3
        romfile = ""
        rombar = 1 (0x1)
        multifunction = true
        command_serr_enable = true
        class SMBus, addr 00:1f.3, pci id 8086:2930 (sub 1af4:1100)
        bar 4: i/o at 0x700 [0x73f]
        bus: i2c
          type i2c-bus
          dev: smbus-eeprom, id ""
            address = 87 (0x57)
          dev: smbus-eeprom, id ""
            address = 86 (0x56)
          dev: smbus-eeprom, id ""
            address = 85 (0x55)
          dev: smbus-eeprom, id ""
            address = 84 (0x54)
          dev: smbus-eeprom, id ""
            address = 83 (0x53)
          dev: smbus-eeprom, id ""
            address = 82 (0x52)
          dev: smbus-eeprom, id ""
            address = 81 (0x51)
          dev: smbus-eeprom, id ""
            address = 80 (0x50)
      dev: ich9-ahci, id ""
        addr = 1f.2
        romfile = ""
        rombar = 1 (0x1)
        multifunction = true
        command_serr_enable = true
        class SATA controller, addr 00:1f.2, pci id 8086:2922 (sub 1af4:1100)
        bar 4: i/o at 0xd060 [0xd07f]
        bar 5: mem at 0xfc812000 [0xfc812fff]
        bus: ide.5
          type IDE
        bus: ide.4
          type IDE
        bus: ide.3
          type IDE
        bus: ide.2
          type IDE
        bus: ide.1
          type IDE
        bus: ide.0
          type IDE
      dev: ICH9-LPC, id ""
        noreboot = true
        addr = 1f.0
        romfile = ""
        rombar = 1 (0x1)
        multifunction = true
        command_serr_enable = true
        class ISA bridge, addr 00:1f.0, pci id 8086:2918 (sub 1af4:1100)
        bus: isa.0
          type ISA
          dev: isa-debugcon, id ""
            iobase = 1026 (0x402)
            chardev = "seabios"
            readback = 233 (0xe9)
          dev: i8257, id ""
            base = 192 (0xc0)
            page-base = 136 (0x88)
            pageh-base = -1 (0xffffffffffffffff)
            dshift = 1 (0x1)
          dev: i8257, id ""
            base = 0 (0x0)
            page-base = 128 (0x80)
            pageh-base = -1 (0xffffffffffffffff)
            dshift = 0 (0x0)
          dev: port92, id ""
          dev: vmmouse, id ""
          dev: vmport, id ""
          dev: i8042, id ""
            isa irqs 1,12
          dev: isa-serial, id ""
            index = 0 (0x0)
            iobase = 1016 (0x3f8)
            irq = 4 (0x4)
            chardev = "serial0"
            wakeup = 0 (0x0)
            isa irq 4
          dev: isa-pcspk, id ""
            iobase = 97 (0x61)
          dev: kvm-pit, id ""
            gpio-in "" 1
            iobase = 64 (0x40)
            lost_tick_policy = "delay"
          dev: mc146818rtc, id ""
            base_year = 0 (0x0)
            lost_tick_policy = "discard"
            isa irq 8
          dev: kvm-i8259, id ""
            iobase = 160 (0xa0)
            elcr_addr = 1233 (0x4d1)
            elcr_mask = 222 (0xde)
            master = false
          dev: kvm-i8259, id ""
            iobase = 32 (0x20)
            elcr_addr = 1232 (0x4d0)
            elcr_mask = 248 (0xf8)
            master = true
      dev: mch, id ""
        addr = 00.0
        romfile = ""
        rombar = 1 (0x1)
        multifunction = false
        command_serr_enable = true
        class Host bridge, addr 00:00.0, pci id 8086:29c0 (sub 1af4:1100)
  dev: fw_cfg_io, id ""
    iobase = 1296 (0x510)
    dma_iobase = 1300 (0x514)
    dma_enabled = true
  dev: kvmclock, id ""
  dev: kvmvapic, id ""

3. Check the info of disk in guest
[root@localhost home]# lsblk
NAME          MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
vda           252:0    0  30G  0 disk 
├─vda1        252:1    0   1G  0 part /boot
└─vda2        252:2    0  29G  0 part 
  ├─rhel-root 253:0    0  26G  0 lvm  /
  └─rhel-swap 253:1    0   3G  0 lvm  [SWAP]
[root@localhost home]# lspci 
00:00.0 Host bridge: Intel Corporation 82G33/G31/P35/P31 Express DRAM Controller
00:01.0 VGA compatible controller: Red Hat, Inc. QXL paravirtual graphic card (rev 04)
00:02.0 PCI bridge: Intel Corporation 7500/5520/5500/X58 I/O Hub PCI Express Root Port 0 (rev 02)
00:03.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev 92)
00:04.0 PCI bridge: Intel Corporation 7500/5520/5500/X58 I/O Hub PCI Express Root Port 0 (rev 02)
00:1f.0 ISA bridge: Intel Corporation 82801IB (ICH9) LPC Interface Controller (rev 02)
00:1f.2 SATA controller: Intel Corporation 82801IR/IO/IH (ICH9R/DO/DH) 6 port SATA Controller [AHCI mode] (rev 02)
00:1f.3 SMBus: Intel Corporation 82801I (ICH9 Family) SMBus Controller (rev 02)
01:00.0 SCSI storage controller: Red Hat, Inc Virtio block device (rev 01)
02:00.0 PCI bridge: Red Hat, Inc. QEMU PCI-PCI bridge
04:00.0 Ethernet controller: Red Hat, Inc Virtio network device (rev 01)
[root@localhost home]# lspci -vvv -t
-[0000:00]-+-00.0  Intel Corporation 82G33/G31/P35/P31 Express DRAM Controller
           +-01.0  Red Hat, Inc. QXL paravirtual graphic card
           +-02.0-[01]----00.0  Red Hat, Inc Virtio block device
           +-03.0-[02-03]----00.0-[03]--
           +-04.0-[04]----00.0  Red Hat, Inc Virtio network device
           +-1f.0  Intel Corporation 82801IB (ICH9) LPC Interface Controller
           +-1f.2  Intel Corporation 82801IR/IO/IH (ICH9R/DO/DH) 6 port SATA Controller [AHCI mode]
           \-1f.3  Intel Corporation 82801I (ICH9 Family) SMBus Controller


Actual results:
Disk didn't be found in guest, but can be found through "info qtree" on hmp

Expected results:
Disk can be found in guest and can be work well

Additional info:
The seabios log and the dmesg log of guest please check the attachment 

Also try another two connected method and failed
1)
-device ioh3420,id=root.3,slot=4 \
-device pci-bridge,bus=root.3,id=bridge3,chassis_nr=2 \
-drive file=/home/pci-block3.qcow2,if=none,id=pci-block3,format=qcow2,cache=none,werror=stop,rerror=stop \
-device virtio-blk-pci,bus=bridge3,drive=pci-block3,id=pciblock3,addr=0x7.1 \
-device virtio-scsi,bus=bridge3,id=scsi2,addr=0x7.2 \
-drive file=/home/pci-block4.raw,if=none,id=pci-block4,format=raw,cache=none,werror=stop,rerror=stop \
-device scsi-disk,bus=scsi2.0,drive=pci-block4,id=pciblock4 \

2)
-device ioh3420,id=root.4,slot=5 \
-device x3130-upstream,bus=root.4,id=upstream2 \
-device xio3130-downstream,bus=upstream2,id=downstream3,chassis=4 \
-device pci-bridge,bus=root.3,id=bridge4,chassis_nr=3 \
-drive file=/home/pci-block5.qcow2,if=none,id=pci-block5,format=qcow2,cache=none,werror=stop,rerror=stop \
-device virtio-blk-pci,bus=bridge4,drive=pci-block5,id=pciblock5,addr=0x8.1 \
-device virtio-scsi,bus=bridge4,id=scsi3,addr=0x8.2 \
-drive file=/home/pci-block6.raw,if=none,id=pci-block6,format=raw,cache=none,werror=stop,rerror=stop \
-device scsi-disk,bus=scsi3.0,drive=pci-block6,id=pciblock6 \
Comment 1 jingzhao 2016-07-21 08:45:09 UTC 
Created attachment 1182400 [details]
The seabios log
Comment 2 jingzhao 2016-07-21 08:45:34 UTC 
Created attachment 1182401 [details]
the dmesg log of guest
Comment 4 Laszlo Ersek 2016-08-04 09:26:33 UTC 
As reported, this BZ is NOTABUG. The QEMU command line is incorrect.

Namely, in all of the failing cases, we have a nonzero PCI function number for the virtio-blk-pci device:

#0
-device virtio-blk-pci,bus=bridge2,drive=pci-block1,id=pciblock1,addr=0x6.1 \

#1
-device virtio-blk-pci,bus=bridge3,drive=pci-block3,id=pciblock3,addr=0x7.1 \

#2
-device virtio-blk-pci,bus=bridge4,drive=pci-block5,id=pciblock5,addr=0x8.1 \

However, a nonzero PCI function number can only be used if:
- function 0 of the same PCI device also exists, and
- the multifunction capability is advertised by function 0.

In practical terms, it means that

  -device virtio-blk-pci,...,addr=0x6.1

will only work if some other

  -device FOOBAR,...,addr=0x6.0,multifunction=on
                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^

option exists.

Multifunction is sometimes used to group 8 virtio-blk-pci devices into a single PCI device (using different function numbers). This allows for better density, but prevents independent hot-(un)plug.

Please repeat the original test either with "addr=0x6.0" (that is, changing the function number to 0), or with "addr=0x6.1" entirely removed. Thanks.
Comment 5 jingzhao 2016-08-10 05:39:47 UTC 
(In reply to Laszlo Ersek from comment #4)
> As reported, this BZ is NOTABUG. The QEMU command line is incorrect.
> 
> Namely, in all of the failing cases, we have a nonzero PCI function number
> for the virtio-blk-pci device:
> 
> #0
> -device virtio-blk-pci,bus=bridge2,drive=pci-block1,id=pciblock1,addr=0x6.1 \
> 
> #1
> -device virtio-blk-pci,bus=bridge3,drive=pci-block3,id=pciblock3,addr=0x7.1 \
> 
> #2
> -device virtio-blk-pci,bus=bridge4,drive=pci-block5,id=pciblock5,addr=0x8.1 \
> 
> However, a nonzero PCI function number can only be used if:
> - function 0 of the same PCI device also exists, and
> - the multifunction capability is advertised by function 0.
> 
> In practical terms, it means that
> 
>   -device virtio-blk-pci,...,addr=0x6.1
> 
> will only work if some other
> 
>   -device FOOBAR,...,addr=0x6.0,multifunction=on
>                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^
> 
> option exists.
> 
> Multifunction is sometimes used to group 8 virtio-blk-pci devices into a
> single PCI device (using different function numbers). This allows for better
> density, but prevents independent hot-(un)plug.
> 
> Please repeat the original test either with "addr=0x6.0" (that is, changing
> the function number to 0), or with "addr=0x6.1" entirely removed. Thanks.

As above metioned, I tried it with following command and it works
1) with "addr=0x6.0"
/usr/libexec/qemu-kvm \
-M q35 \
-cpu SandyBridge \
-nodefaults -rtc base=utc \
-m 4G \
-smp 2,sockets=2,cores=1,threads=1 \
-enable-kvm \
-name rhel7.3 \
-uuid 990ea161-6b67-47b2-b803-19fb01d30d12 \
-smbios type=1,manufacturer='Red Hat',product='RHEV Hypervisor',version=el6,serial=koTUXQrb,uuid=feebc8fd-f8b0-4e75-abc3-e63fcdb67170 \
-k en-us \
-serial unix:/tmp/serial0,server,nowait \
-boot menu=on \
-bios /usr/share/seabios/bios.bin \
-chardev file,path=/home/seabios.log,id=seabios \
-device isa-debugcon,chardev=seabios,iobase=0x402 \
-qmp tcp::8887,server,nowait \
-vga qxl \
-spice port=5932,disable-ticketing \
-device ioh3420,id=root.0,slot=1 \
-drive file=/home/q35-seabios.qcow2,if=none,id=drive-virtio-disk0,format=qcow2,cache=none,werror=stop,rerror=stop \
-device virtio-blk-pci,bus=root.0,drive=drive-virtio-disk0,id=virtio-disk0,disable-legacy=on,disable-modern=off,bootindex=1 \
-device i82801b11-bridge,bus=pcie.0,id=bridge1 \
-device pci-bridge,bus=bridge1,id=bridge2,chassis_nr=1 \
-drive file=/home/pci-block1.qcow2,if=none,id=pci-block1,format=qcow2,cache=none,werror=stop,rerror=stop \
-device virtio-blk-pci,bus=bridge2,drive=pci-block1,id=pciblock1 \
-device ioh3420,id=root.2,slot=3 \
-device virtio-net-pci,bus=root.2,netdev=tap10,mac=9a:6a:6b:6c:6d:6e,disable-legacy=on,disable-modern=off -netdev tap,id=tap10 \
-monitor stdio \

2)with "addr=0x6.1" entirely removed, it didn't work
QEMU 2.6.0 monitor - type 'help' for more information
(qemu) qemu-kvm: -device virtio-blk-pci,bus=bridge2,drive=pci-block1,id=pciblock1: Unsupported PCI slot 0 for standard hotplug controller. Valid slots are between 1 and 31.

So I think we can close bz 

Thanks
Jing Zhao
Comment 6 Marcel Apfelbaum 2016-08-14 13:54:07 UTC 
Laszlo and Jing, Thanks for all the help!
Marcel