VT-d support in HVM?

VT-d support in HVM?

[Stephan Seitz]

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Hi,

I've recently setup a few machines with 3.2 64bit without any unresolvable problem.
These machines all run pv domU's and a view "basic" hvm domUs.

As I've got one machine left for internal use and testing, I would like to take a
look at pciback with VT-d support (bios screen shows a VT-d [enable|disable]).

My question is, do I need to add patches, or use specific changesets to have VT-d
code available in xen / dom0 kernel? If so, could someone provide me link?
Indeed, I found a lot of information in xen-devel, but I don't know which of the
submitted patches are accepted and which are merged into mercurial.

Is redirection of e.g. a pci network card or a pci isdn card possible for hvm
domU's without special driver support by the guest (say: windows)?
Is there any support for pci/e and/or pci-x?

Lots of questions ;)

Could someone please shed some light?

Thanks in advance.





-- 
Stephan Seitz
Senior System Administrator

*netz-haut* e.K.
multimediale kommunikation

zweierweg 22
97074 würzburg

fon: +49 931 2876247
fax: +49 931 2876248

web: www.netz-haut.de <http://www.netz-haut.de/>

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_______________________________________________
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RE: [Xen-users] VT-d support in HVM?

[You, Yongkang]

On Friday, February 08, 2008 11:10 PM, "Stephan Seitz" wrote:
> 
> My question is, do I need to add patches, or use specific changesets
> to have VT-d code available in xen / dom0 kernel? If so, could
> someone provide me link? 

There is a VT-d quick README in xen_source/docs/misc/vtd.txt
Anotherr link:
http://wiki.xensource.com/xenwiki/VTdHowTo?highlight=%28vtd%29

> Indeed, I found a lot of information in xen-devel, but I don't know
> which of the submitted patches are accepted and which are merged into
> mercurial. 
> 
> Is redirection of e.g. a pci network card or a pci isdn card possible
> for hvm domU's without special driver support by the guest (say:
> windows)? 

Guest needs drivers to enable devices. Dom0 doesn't need. 

> Is there any support for pci/e and/or pci-x?

Yes. It supports PCIe and PCI/x devices. But, guest doesn't supported MSI yet. For example, in Linux (kernel >=2.6.18), it needs an additional kernel boot option: "pci=nomsi".

Best Regards,
Yongkang You

Re: VT-d support in HVM?

[Stephan Seitz]

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You, Yongkang schrieb:
> On Friday, February 08, 2008 11:10 PM, "Stephan Seitz" wrote:
>> My question is, do I need to add patches, or use specific changesets
>> to have VT-d code available in xen / dom0 kernel? If so, could
>> someone provide me link? 
> 
> There is a VT-d quick README in xen_source/docs/misc/vtd.txt
> Anotherr link:
> http://wiki.xensource.com/xenwiki/VTdHowTo?highlight=%28vtd%29

Thanks for your quick response, next time I'll take a look at /docs first... ;)
Anyway, I've tried this with my currently available kernel (with pciback as module),
as well as I did  pciback hiding via modprobe the HVM refuses to load the pci device
(No vt-d or device not found or device not hidden).
I'm not sure if this is caused by an unsupported chipset or my xen-build. So I'll
follow the docs step-by-step and post the results later.

By now xm dmesg shows following statement about VT-D:

(Don't know if this messages is caused by an unsupported chipset. I'll see...)



  \ \/ /___ _ __   |___ / |___ \  / _ \
   \  // _ \ '_ \    |_ \   __) || | | |
   /  \  __/ | | |  ___) | / __/ | |_| |
  /_/\_\___|_| |_| |____(_)_____(_)___/

(XEN) Xen version 3.2.0 (root@halo.local) (gcc version 4.1.3 20070929 (prerelease) (Ubuntu 4.1.2-16ubuntu2)) Mon Jan 21 
10:18:53 CET 2008
(XEN) Latest ChangeSet: unavailable
(XEN) Command line: loopback.nloopbacks=16 dom0_mem=512M vtd=1
(XEN) Video information:
(XEN)  VGA is text mode 80x25, font 8x16
(XEN)  VBE/DDC methods: none; EDID transfer time: 2 seconds
(XEN)  EDID info not retrieved because no DDC retrieval method detected
(XEN) Disc information:
(XEN)  Found 2 MBR signatures
(XEN)  Found 2 EDD information structures
(XEN) Xen-e820 RAM map:
(XEN)  0000000000000000 - 000000000009dc00 (usable)
(XEN)  000000000009dc00 - 00000000000a0000 (reserved)
(XEN)  00000000000ce000 - 00000000000d0000 (reserved)
(XEN)  00000000000e0000 - 0000000000100000 (reserved)
(XEN)  0000000000100000 - 00000000cfe70000 (usable)
(XEN)  00000000cfe70000 - 00000000cfe83000 (ACPI data)
(XEN)  00000000cfe83000 - 00000000cfe86000 (ACPI NVS)
(XEN)  00000000cfe86000 - 00000000d0000000 (reserved)
(XEN)  00000000e0000000 - 00000000f0000000 (reserved)
(XEN)  00000000fec00000 - 00000000fed00000 (reserved)
(XEN)  00000000fee00000 - 00000000fee01000 (reserved)
(XEN)  00000000ff000000 - 0000000100000000 (reserved)
(XEN)  0000000100000000 - 0000000130000000 (usable)
(XEN) System RAM: 4094MB (4192308kB)
(XEN) Xen heap: 14MB (14952kB)
(XEN) Domain heap initialised: DMA width 32 bits
(XEN) Processor #0 6:15 APIC version 20
(XEN) Processor #1 6:15 APIC version 20
(XEN) IOAPIC[0]: apic_id 2, version 32, address 0xfec00000, GSI 0-23
(XEN) IOAPIC[1]: apic_id 3, version 32, address 0xfecc0000, GSI 24-47
(XEN) IOAPIC[2]: apic_id 4, version 32, address 0xfecc0400, GSI 48-71
(XEN) Enabling APIC mode:  Flat.  Using 3 I/O APICs
(XEN) [VT-D]ACPI DMAR:Unknown DMAR structure type
(XEN) [VT-D]ACPI DMAR:No DMAR devices found
(XEN) Using scheduler: SMP Credit Scheduler (credit)
(XEN) Detected 2660.040 MHz processor.
(XEN) HVM: VMX enabled
(XEN) CPU0: Intel(R) Core(TM)2 Duo CPU     E6750  @ 2.66GHz stepping 0b
(XEN) Booting processor 1/1 eip 8c000
(XEN) CPU1: Intel(R) Core(TM)2 Duo CPU     E6750  @ 2.66GHz stepping 0b
(XEN) Total of 2 processors activated.
(XEN) ENABLING IO-APIC IRQs
(XEN)  -> Using new ACK method
(XEN) Platform timer overflows in 14998 jiffies.
(XEN) Platform timer is 14.318MHz HPET
(XEN) Brought up 2 CPUs
(XEN) AMD IOMMU: Disabled
(XEN) *** LOADING DOMAIN 0 ***
(XEN)  Xen  kernel: 64-bit, lsb, compat32
(XEN)  Dom0 kernel: 64-bit, lsb, paddr 0xffffffff80200000 -> 0xffffffff80680688
(XEN) PHYSICAL MEMORY ARRANGEMENT:
(XEN)  Dom0 alloc.:   000000012a000000->000000012c000000 (122880 pages to be allocated)
(XEN) VIRTUAL MEMORY ARRANGEMENT:
(XEN)  Loaded kernel: ffffffff80200000->ffffffff80680688
(XEN)  Init. ramdisk: ffffffff80681000->ffffffff81a58a00
(XEN)  Phys-Mach map: ffffffff81a59000->ffffffff81b59000
(XEN)  Start info:    ffffffff81b59000->ffffffff81b594a4
(XEN)  Page tables:   ffffffff81b5a000->ffffffff81b6b000
(XEN)  Boot stack:    ffffffff81b6b000->ffffffff81b6c000
(XEN)  TOTAL:         ffffffff80000000->ffffffff81c00000
(XEN)  ENTRY ADDRESS: ffffffff80200000
(XEN) Dom0 has maximum 2 VCPUs
[...]


>> Indeed, I found a lot of information in xen-devel, but I don't know
>> which of the submitted patches are accepted and which are merged into
>> mercurial. 
>>
>> Is redirection of e.g. a pci network card or a pci isdn card possible
>> for hvm domU's without special driver support by the guest (say:
>> windows)? 
> 
> Guest needs drivers to enable devices. Dom0 doesn't need. 
> 
>> Is there any support for pci/e and/or pci-x?
> 
> Yes. It supports PCIe and PCI/x devices. But, guest doesn't supported MSI yet. For example, in Linux (kernel >=2.6.18), it needs an additional kernel boot option: "pci=nomsi".
> 
> Best Regards,
> Yongkang You


-- 
Stephan Seitz
Senior System Administrator

*netz-haut* e.K.
multimediale kommunikation

zweierweg 22
97074 würzburg

fon: +49 931 2876247
fax: +49 931 2876248

web: www.netz-haut.de <http://www.netz-haut.de/>

registriergericht: amtsgericht würzburg, hra 5054

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title:Senior System Administrator
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RE: VT-d support in HVM?

[Kay, Allen M]

>My question is, do I need to add patches, or use specific 
>changesets to have VT-d
>code available in xen / dom0 kernel? If so, could someone 
>provide me link? 

Xen3.2 already contains all the patches for vt-d support.  You should
not need additional patches to get vt-d to work.

Allen