Re: [Xen-devel] PCI Passthru: fn0 exported but not fn1

[Jambunathan K <jambunathan@xxxxxxxxxx>]

Keir Fraser wrote:
>> As I worte accidently direct to Keir and not to the list, I face the
>> same problem. I'd like to have option 1, because it worked fine and I
>> don't see a benefit of having a dummy device in the domU.
>>
>> Dedecating single fnX to a domain is very usefull for example to give
>> the domUs ethernets of a four port card. I'm also running one domU
>> that is only using one of the USB 1.x controllers of a USB PCI addon
>> card.
> 
> Okay, if you want to check out the 'fix' to revert behaviour to that of
> 3.0.4 for yourselves, it is to edit
> linux/include/asm-i386/mach-xen/asm/pci.h and to change the definition
> therein of pcibios_scan_all_fns() from 0 to 1.
> 
> If you are building a 64-bit kernel then of course it is the file in
> include/asm-x86_64 that you need to edit.
> 
> Make that change and rebuild you domU. Additionally, make sure you build
> dom0 with pciback in passthrough mode. Hopefully your problems will be gone!


I am using x86_64.

Just to be sure I 'fixed'
linux-2.6-xen-sparse/include/asm-x86_64/mach-xen/asm/pci.h and  made a
clean build from xen source tar. I ensured that BACKEND_PASS is set to yes.

I am using the same vmlinuz both on Dom0 and Dom1. I am seeing that
lspci in Dom1 *doesn't* report the exported non-zero function.


XEN-PROTO-SUSE $ cat
linux-2.6.18-xen/include/asm-x86_64/mach-xen/asm/pci.h | grep scan
/* Can be used to override the logic in pci_scan_bus for skipping
#define pcibios_scan_all_fns(a, b)      1
struct pci_bus * pcibios_scan_root(int bus);


XEN-PROTO-SUSE $ cat
linux-2.6-xen-sparse/include/asm-x86_64/mach-xen/asm/pci.h | grep scan
/* Can be used to override the logic in pci_scan_bus for skipping
#define pcibios_scan_all_fns(a, b)      1
struct pci_bus * pcibios_scan_root(int bus);

XEN-PROTO-SUSE $ uname -a
Linux xen2 2.6.18-xen-310-new-xen #2 SMP Wed Aug 29 08:44:29 EDT 2007
x86_64 x86_64 x86_64 GNU/Linux


XEN-PROTO-RHEL $ dmesg | grep pcifront

Bootdata ok (command line is root=/dev/sda10 pcifront.verbose_request=1)
Kernel command line: root=/dev/sda10 pcifront.verbose_request=1
pcifront pci-0: Installing PCI frontend
pcifront pci-0: Creating PCI Frontend Bus 0000:04
pcifront pci-0: read dev=0000:04:00.0 - offset 0 size 4
pcifront pci-0: read dev=0000:04:01.0 - offset 0 size 4
pcifront pci-0: read dev=0000:04:02.0 - offset 0 size 4
pcifront pci-0: read dev=0000:04:03.0 - offset 0 size 4
pcifront pci-0: read dev=0000:04:04.0 - offset 0 size 4
pcifront pci-0: read dev=0000:04:05.0 - offset 0 size 4
pcifront pci-0: read dev=0000:04:06.0 - offset 0 size 4
pcifront pci-0: read dev=0000:04:07.0 - offset 0 size 4
pcifront pci-0: read dev=0000:04:08.0 - offset 0 size 4
pcifront pci-0: read dev=0000:04:09.0 - offset 0 size 4
pcifront pci-0: read dev=0000:04:0a.0 - offset 0 size 4
pcifront pci-0: read dev=0000:04:0b.0 - offset 0 size 4
pcifront pci-0: read dev=0000:04:0c.0 - offset 0 size 4
pcifront pci-0: read dev=0000:04:0d.0 - offset 0 size 4
pcifront pci-0: read dev=0000:04:0e.0 - offset 0 size 4
pcifront pci-0: read dev=0000:04:0f.0 - offset 0 size 4
pcifront pci-0: read dev=0000:04:10.0 - offset 0 size 4
pcifront pci-0: read dev=0000:04:11.0 - offset 0 size 4
pcifront pci-0: read dev=0000:04:12.0 - offset 0 size 4
pcifront pci-0: read dev=0000:04:13.0 - offset 0 size 4
pcifront pci-0: read dev=0000:04:14.0 - offset 0 size 4
pcifront pci-0: read dev=0000:04:15.0 - offset 0 size 4
pcifront pci-0: read dev=0000:04:16.0 - offset 0 size 4
pcifront pci-0: read dev=0000:04:17.0 - offset 0 size 4
pcifront pci-0: read dev=0000:04:18.0 - offset 0 size 4
pcifront pci-0: read dev=0000:04:19.0 - offset 0 size 4
pcifront pci-0: read dev=0000:04:1a.0 - offset 0 size 4
pcifront pci-0: read dev=0000:04:1b.0 - offset 0 size 4
pcifront pci-0: read dev=0000:04:1c.0 - offset 0 size 4
pcifront pci-0: read dev=0000:04:1d.0 - offset 0 size 4
pcifront pci-0: read dev=0000:04:1e.0 - offset 0 size 4
pcifront pci-0: read dev=0000:04:1f.0 - offset 0 size 4

XEN-PROTO-SUSE $ xenstore-ls /local/domain/0/backend/pci
13 = ""
 0 = ""
  domain = "pvm-guest-1"
  frontend = "/local/domain/13/device/pci/0"
  uuid = "e294e348-fc0a-9bf1-fcf9-93f9665505bd"
  dev-0 = "0000:04:00.01"
  state = "4"
  online = "1"
  frontend-id = "13"
  num_devs = "1"
  root-0 = "0000:04"
  root_num = "1"

XEN-PROTO-SUSE $ xenstore-ls /local/domain/13/device/pci
0 = ""
 state = "4"
 backend-id = "0"
 backend = "/local/domain/0/backend/pci/13/0"
 pci-op-ref = "8"
 event-channel = "6"
 magic = "7"

XEN-PROTO-SUSE $ xm list --long
(domain
    (domid 0)
    (on_crash restart)
    (uuid 00000000-0000-0000-0000-000000000000)
    (bootloader_args )
    (vcpus 8)
    (name Domain-0)
    (on_poweroff destroy)
    (on_reboot restart)
    (bootloader )
    (maxmem 16777215)
    (memory 1600)
    (shadow_memory 0)
    (cpu_weight 256)
    (cpu_cap 0)
    (features )
    (on_xend_start ignore)
    (on_xend_stop ignore)
    (cpu_time 301.173107752)
    (online_vcpus 8)
    (image (linux (kernel ) (rtc_timeoffset 0)))
    (status 2)
    (state r-----)
)
(domain
    (domid 13)
    (on_crash restart)
    (uuid 0b2b804f-e5ed-f046-ae7e-819037019c21)
    (bootloader_args )
    (vcpus 1)
    (name pvm-guest-1)
    (on_poweroff destroy)
    (on_reboot restart)
    (bootloader )
    (maxmem 1700)
    (memory 1700)
    (shadow_memory 0)
    (cpu_weight 256)
    (cpu_cap 0)
    (features )
    (on_xend_start ignore)
    (on_xend_stop ignore)
    (start_time 1188396494.65)
    (cpu_time 7.201405283)
    (online_vcpus 1)
    (image
        (linux
            (kernel /boot/xen310-new/vmlinuz-2.6.18-xen-310-new-xen)
            (ramdisk /boot/xen310-new/initrd-2.6.18-xen-310-new-xen.img)
            (args 'root=/dev/sda10 pcifront.verbose_request=1')
            (rtc_timeoffset 0)
            (notes
                (FEATURES

'writable_page_tables|writable_descriptor_tables|auto_translated_physmap|pae_pgdir_above_4gb|supervisor_mode_kernel'
                )
                (VIRT_BASE -2147483648)
                (GUEST_VERSION 2.6)
                (PADDR_OFFSET -2147483648)
                (GUEST_OS linux)
                (HYPERCALL_PAGE -2145361920)
                (LOADER generic)
                (SUSPEND_CANCEL 1)
                (ENTRY -2145386496)
                (XEN_VERSION xen-3.0)
            )
        )
    )
    (status 2)
    (state -b----)
    (store_mfn 1400305)
    (console_mfn 1400304)
    (device
        (vif
            (bridge xenbr0)
            (uuid 65d1b021-70ff-d673-d59c-15a1432edfd4)
            (script vif-bridge)
            (mac aa:cc:00:00:00:01)
            (type netfront)
            (backend 0)
        )
    )
    (device
        (vbd
            (uname phy:VolGroup00/LogVol01)
            (uuid f1abc318-00cf-8d70-4a98-7b6b3c8e7630)
            (mode w)
            (dev sda10:disk)
            (backend 0)
            (bootable 1)
        )
    )
    (device
        (vbd
            (uname phy:VolGroup00/LogVol00)
            (uuid 04fb2c99-e334-5efe-40e5-8fba96340f74)
            (mode w)
            (dev sda11:disk)
            (backend 0)
            (bootable 0)
        )
    )
    (device
        (console
            (protocol vt100)
            (location 2)
            (uuid 42e6c974-c273-7225-edf3-1812c2410fd1)
        )
    )
    (device
        (pci
            (dev (slot 0x00) (bus 0x04) (domain 0x0000) (func 0x01))
            (uuid e294e348-fc0a-9bf1-fcf9-93f9665505bd)
            (backend 0)
        )
    )
)



Regards,
Jambunathan K.

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