FW: [Xen-users] Re: [Xen-devel] Xen - Guest memory allocation

[dinesh chandrasekaran <dinesh_chan8@xxxxxxxxxxx>]

       Xen, during boot up prints the following,

__  __            _____  _____                    _        _     _     
 \ \/ /___ _ __   |___ / |___ /    _   _ _ __  ___| |_ __ _| |__ | | ___
  \  // _ \ '_ \    |_ \   |_ \ __| | | | '_ \/ __| __/ _` | '_ \| |/ _ \
  /  \  __/ | | |  ___) | ___) |__| |_| | | | \__ \ || (_| | |_) | |  __/
 /_/\_\___|_| |_| |____(_)____/    \__,_|_| |_|___/\__\__,_|_.__/|_|\___|
                                                                        
(XEN) Xen version 3.3-unstable (reddy@(none)) (gcc version 4.1.1 (Gentoo 4.1.1-r3)) Sat May 31 00:05:56 Local time zone must be set--see zic manual page 2008
(XEN) Latest ChangeSet: Fri May 30 19:31:18 2008 +0100 17760:6e688d5a936b
(XEN) Command line:
(XEN) Video information:
(XEN)  VGA is text mode 80x25, font 8x16
(XEN)  VBE/DDC methods: V2; EDID transfer time: 2 seconds
(XEN) Disc information:
(XEN)  Found 1 MBR signatures
(XEN)  Found 1 EDD information structures
(XEN) pci_base =  df000000 : pci_2 = 0
(XEN) Xen-e820 RAM map:
(XEN)  0000000000000000 - 0000000000094400 (usable)
(XEN)  0000000000094400 - 00000000000a0000 (reserved)
(XEN)  00000000000c2000 - 0000000000100000 (reserved)
(XEN)  0000000000100000 - 00000000cfe90000 (usable)
(XEN)  00000000cfe90000 - 00000000cfea3000 (ACPI data)
(XEN)  00000000cfea3000 - 00000000cff00000 (ACPI NVS)
(XEN)  00000000cff00000 - 00000000d0000000 (reserved)
(XEN)  00000000e0000000 - 00000000f0000000 (reserved)
(XEN)  00000000fec00000 - 00000000fec00400 (reserved)
(XEN)  00000000fee00000 - 00000000fee01000 (reserved)
(XEN)  00000000fff80000 - 0000000100000000 (reserved)
(XEN)  0000000100000000 - 0000000230000000 (usable)
(XEN)  00000000df000000 - 00000000df0fffff (PCI_usable)             <this is the pci_device's BAR1 value>

but after DomO comes up, the config space dump of the pci_device obtained through,

lspci -xxxx <pci_device>

shows me a different BAR1 value.

Could someone tell me what could be the cause?

Thanks,
Dinesh C

> Date: Fri, 20 Jun 2008 18:03:20 +0100
> From: gm281@xxxxxxxxx
> To: dinesh_chan8@xxxxxxxxxxx
> Subject: Re: [Xen-users] Re: [Xen-devel] Xen - Guest memory allocation
> CC: xen-devel@xxxxxxxxxxxxxxxxxxx; xen-users@xxxxxxxxxxxxxxxxxxx
>
> >> Why do you want to restrict DomU to use frames from certain range
> >> only? What's the logic behind that?
> >
> > Im trying to allocate memory for domUs from memory behind a PCI device. The
> > machine_addr_start is obtained by probing the device (as I know the vendor
> > and device info) during xen boot-up.
>
> That's what I was suspecting. I think you should give PCI passthrough
> a go first.
> PCI passthrough allows a PCI device to be hidden away from Dom0 and
> exported to a DomU. You achieve the first by passing
> pciback.hide=(XX:XX.X) option to Dom0 kernel and adding pci = [
> 'XX:XX.X′ ] to DomU config file. You'll also need
> CONFIG_XEN_PCIDEV_FRONTEND=y and CONFIG_XEN_PCIDEV_BACKEND=y in your
> DomU and Dom0 kernel configs.
>
> Hope this helps
> Gr(z)egor(z)

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