[虚拟化/云][全栈demo] 为qemu增加一个PCI的watchdog外设（四）

通过前面的操作，我们已经可以创建一个带有我们自己的PCI的watchdog外设qemu 虚拟机了。

目的：

1. 了解我们的外设情况。

2. 为在guest中开发我们自己的linux PCI驱动程序做准备。

查看我们的watchdog设备

考虑到ubuntu对于 spice的支持不好。我们采用VNC显示。

-vnc 127.0.0.1:21 -vga cirrus -chardev stdio,id=mon0 -mon chardev=mon0,mode=readline

启动qemu

$ sudo x86_64-softmmu/qemu-system-x86_64 -enable-kvm -m 1024 -smp 1,sockets=1,cores=1,threads=1 -device cstl-watchdog -device virtio-blk-pci,scsi=off,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1 -drive file=/home/shhfeng/iso/image/ubuntu.12.04.img,if=none,id=drive-virtio-disk0,format=qcow2,cache=none  -net bridge,br=virbr2,helper=/home/shhfeng/qemu/debug/qemu-bridge-helper -net nic,model=virtio  -vnc 127.0.0.1:21 -vga cirrus -chardev stdio,id=mon0 -mon chardev=mon0,mode=readline

在qemu的monitor中查看watchdog的信息：

（qemu） info qtree

 (qemu) info qtree
 bus: main-system-bus
   type System
   dev: hpet, id ""
     gpio-in
     gpio-out
     timers =  (0x3)
     msi = false
     hpet-intcap =  (0x4)
     irq
     mmio 00000000fed00000/
   dev: kvm-ioapic, id ""
     gpio-in
     gsi_base =  ()
     irq
     mmio 00000000fec00000/
   dev: i440FX-pcihost, id ""
     pci-hole64-size =  ( EiB)
     short_root_bus =  ()
     irq
     bus: pci.
       type PCI
       dev: cstl-watchdog, id ""
         expiration-ticks =  (0xa)
         addr = 05.0
         romfile = ""
         rombar =  (0x1)
         multifunction = false
         command_serr_enable = true
         class Class , addr :05.0, pci id 1af4: (sub 1af4:)
         bar : i/o at 0xc070 [0xc07f]
       dev: virtio-blk-pci, id "virtio-disk0"
         class =  ()
         ioeventfd = true
         vectors =  (0x2)
         indirect_desc = true
         event_idx = true
         drive = "drive-virtio-disk0"
         logical_block_size =  (0x200)
         physical_block_size =  (0x200)
         min_io_size =  ()
         opt_io_size =  ()
         bootindex =  (0x2)
         discard_granularity =  (0xffffffff)
         cyls =  ()
         heads =  ()
         secs =  ()
         serial = ""
         config-wce = true
         scsi = false
         x-iothread = ""
         addr = 04.0
         romfile = ""
         rombar =  (0x1)
         multifunction = false
         command_serr_enable = true
         class SCSI controller, addr :04.0, pci id 1af4: (sub 1af4:)
         bar : i/o at 0xc000 [0xc03f]
         bar : mem at 0xfebd2000 [0xfebd2fff]
         bus: virtio-bus
           type virtio-pci-bus
           dev: virtio-blk-device, id ""
             drive = "drive-virtio-disk0"
             logical_block_size =  (0x200)
             physical_block_size =  (0x200)
             min_io_size =  ()
             opt_io_size =  ()
             bootindex =  (0x2)
             discard_granularity =  (0xffffffff)
             cyls =  (0x3fff)
             heads =  (0x10)
             secs =  (0x3f)
             serial = ""
             config-wce = true
             scsi = false
             x-iothread = ""
       dev: PIIX4_PM, id ""
         smb_io_base =  (0xb100)
         disable_s3 =  ()
         disable_s4 =  ()
         s4_val =  (0x2)
         acpi-pci-hotplug-with-bridge-support = true
         addr = 01.3
         romfile = ""
         rombar =  (0x1)
         multifunction = false
         command_serr_enable = true
         class Bridge, addr :01.3, pci id : (sub 1af4:)
         bus: i2c
           type i2c-bus
           dev: smbus-eeprom, id ""
             address =  (0x57)
           dev: smbus-eeprom, id ""
             address =  (0x56)
           dev: smbus-eeprom, id ""
             address =  (0x55)
           dev: smbus-eeprom, id ""
             address =  (0x54)
           dev: smbus-eeprom, id ""
             address =  (0x53)
           dev: smbus-eeprom, id ""
             address =  (0x52)
           dev: smbus-eeprom, id ""
             address =  (0x51)
           dev: smbus-eeprom, id ""
             address =  (0x50)
       dev: piix3-ide, id ""
         addr = 01.1
         romfile = ""
         rombar =  (0x1)
         multifunction = false
         command_serr_enable = true
         class IDE controller, addr :01.1, pci id : (sub 1af4:)
         bar : i/o at 0xc060 [0xc06f]
         bus: ide.
           type IDE
           dev: ide-cd, id "ide0-1-0"
             drive = "drive-ide0-1-0"
             logical_block_size =  (0x200)
             physical_block_size =  (0x200)
             min_io_size =  ()
             opt_io_size =  ()
             bootindex =  (0x1)
             discard_granularity =  (0x200)
             ver = "1.7.90"
             wwn =  ()
             serial = "QM00003"
             model = ""
             unit =  ()
         bus: ide.
           type IDE
       dev: virtio-net-pci, id ""
         ioeventfd = false
         vectors =  (0x3)
         indirect_desc = true
         event_idx = true
         any_layout = true
         csum = false
         guest_csum = false
         gso = true
         guest_tso4 = false
         guest_tso6 = false
         guest_ecn = false
         guest_ufo = false
         host_tso4 = false
         host_tso6 = false
         host_ecn = false
         host_ufo = false
         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 = "52:54:00:12:34:56"
         vlan =
         netdev = "hub0port1"
         bootindex = - (0xffffffffffffffff)
         x-txtimer =  (0x249f0)
         x-txburst =  (0x100)
         tx = ""
         addr = 03.0
         romfile = "efi-virtio.rom"
         rombar =  (0x1)
         multifunction = false
         command_serr_enable = true
         class Ethernet controller, addr :03.0, pci id 1af4: (sub 1af4:)
         bar : i/o at 0xc040 [0xc05f]
         bar : mem at 0xfebd1000 [0xfebd1fff]
         bar : mem at 0xffffffffffffffff [0x3fffe]
         bus: virtio-bus
           type virtio-pci-bus
           dev: virtio-net-device, id ""
             mac = "52:54:00:12:34:56"
             vlan =
             netdev = "hub0port1"
             bootindex = - (0xffffffffffffffff)
             x-txtimer =  (0x249f0)
             x-txburst =  (0x100)
             tx = ""
       dev: cirrus-vga, id ""
         vgamem_mb =  (0x8)
         addr = 02.0
         romfile = "vgabios-cirrus.bin"
         rombar =  (0x1)
         multifunction = false
         command_serr_enable = true
         class VGA controller, addr :02.0, pci id :00b8 (sub 1af4:)
         bar : mem at 0xfc000000 [0xfdffffff]
         bar : mem at 0xfebd0000 [0xfebd0fff]
         bar : mem at 0xffffffffffffffff [0xfffe]
       dev: PIIX3, id ""
         addr = 01.0
         romfile = ""
         rombar =  (0x1)
         multifunction = true
         command_serr_enable = true
         class ISA bridge, addr :01.0, pci id : (sub 1af4:)
         bus: isa.
           type ISA
           dev: isa-fdc, id ""
             iobase =  (0x3f0)
             irq =  (0x6)
             dma =  (0x2)
             driveA = "floppy0"
             driveB = ""
             bootindexA = - (0xffffffffffffffff)
             bootindexB = - (0xffffffffffffffff)
             check_media_rate = true
             isa irq
           dev: port92, id ""
           dev: vmmouse, id ""
           dev: vmport, id ""
           dev: i8042, id ""
             isa irqs ,
           dev: isa-parallel, id ""
             index =  ()
             iobase =  (0x378)
             irq =  (0x7)
             chardev = "parallel0"
             isa irq
           dev: isa-serial, id ""
             index =  ()
             iobase =  (0x3f8)
             irq =  (0x4)
             chardev = "serial0"
             wakeup =  ()
             isa irq
           dev: isa-pcspk, id ""
             iobase =  (0x61)
           dev: kvm-pit, id ""
             gpio-in
             iobase =  (0x40)
             lost_tick_policy = "delay"
           dev: mc146818rtc, id ""
             base_year =  ()
             lost_tick_policy = "discard"
           dev: kvm-i8259, id ""
             iobase =  (0xa0)
             elcr_addr =  (0x4d1)
             elcr_mask =  (0xde)
             master = false
           dev: kvm-i8259, id ""
             iobase =  (0x20)
             elcr_addr =  (0x4d0)
             elcr_mask =  (0xf8)
             master = true
       dev: i440FX, id ""
         addr = 00.0
         romfile = ""
         rombar =  (0x1)
         multifunction = false
         command_serr_enable = true
         class Host bridge, addr :00.0, pci id : (sub 1af4:)
   dev: fw_cfg, id ""
     ctl_iobase =  (0x510)
     data_iobase =  (0x511)
     irq
     mmio ffffffffffffffff/
     mmio ffffffffffffffff/
   dev: kvmclock, id ""
     irq
   dev: kvmvapic, id ""
     irq
   dev: icc-bridge, id ""
     irq
     mmio 00000000fee00000/
     bus: icc
       type icc-bus
       dev: kvm-apic, id ""
         id =  ()
         vapic = true
       dev: qemu64-x86_64-cpu, id ""
         pmu = false
         hv-spinlocks = - (0xffffffffffffffff)
         hv-relaxed = false
         hv-vapic = false
         hv-time = false
         check = false
         enforce = false

可以找到我们的watchdog设备：

dev: cstl-watchdog, id ""
        expiration-ticks = 10 (0xa)
        addr = 05.0
        romfile = ""
        rombar = 1 (0x1)
        multifunction = false
        command_serr_enable = true
        class Class 0880, addr 00:05.0, pci id 1af4:0101 (sub 1af4:1100)
        bar 0: i/o at 0xc090 [0xc09f]
有些激动。

在guest中查看watchdog的信息。

$ lspci
00:00.0 Host bridge: Intel Corporation 440FX - 82441FX PMC [Natoma] (rev 02)
00:01.0 ISA bridge: Intel Corporation 82371SB PIIX3 ISA [Natoma/Triton II]
00:01.1 IDE interface: Intel Corporation 82371SB PIIX3 IDE [Natoma/Triton II]
00:01.3 Bridge: Intel Corporation 82371AB/EB/MB PIIX4 ACPI (rev 03)
00:02.0 VGA compatible controller: Cirrus Logic GD 5446
00:03.0 Ethernet controller: Red Hat, Inc Virtio network device
00:04.0 Ethernet controller: Red Hat, Inc Virtio network device
00:05.0 System peripheral: Red Hat, Inc Device 0101 (rev 01)
00:06.0 SCSI storage controller: Red Hat, Inc Virtio block device

可以看到我们的device设备， Red Hat, Inc Device 0101 (rev 01)，这个我们的代码中定义的是一致的。

static void cwd_class_init(ObjectClass *klass, void *data)
{
    DeviceClass *dc = DEVICE_CLASS(klass);
    PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);

    k->init = cwd_realize;
    k->exit = cwd_unrealize;
    k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
    k->device_id = 0x0101;
    k->revision = 0x01;
    k->class_id = PCI_CLASS_SYSTEM_OTHER;
    dc->reset = cwd_reset;
    dc->vmsd = &vmstate_cwd;
    dc->props = cwd_properties;
}

在guest中，查看watchdog的配置寄存器

$ lspci -x
00:05.0 System peripheral: Red Hat, Inc Device 0101 (rev 01)
00: f4 1a 01 01 03 01 00 00 01 00 80 08 00 00 00 00
10: 91 c0 00 00 00 00 00 00 00 00 00 00 00 00 00 00
20: 00 00 00 00 00 00 00 00 00 00 00 00 f4 1a 00 11
30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00