Problem with auto-detecting a HV environment from within Linux

Haiyang Zhang haiyangz at
Thu Feb 25 18:37:05 UTC 2010

> From: Greg KH [mailto:greg at]
> Sent: Thursday, February 25, 2010 12:36 PM
> What does the following command output in a HV virtual system:
> 	grep . /sys/bus/acpi/devices/*/modalias


> How about DMI data?  Does the Host export any info there?  Is there
> anything in the /sys/class/dmi/id/ directory?  If so, can you send the
> output of:
> 	cat /sys/class/dmi/id/modalias


> And you are sure no PCI devices are present to key off of that are
> never going to show up in a "physical" machine?

There is also a pci device as you said:
00:08.0 VGA compatible controller: Microsoft Corporation Device 5353 (prog-if 00 [VGA controller])
        Control: I/O+ Mem+ BusMaster+ SpecCycle+ MemWINV+ VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
        Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
        Latency: 0
        Interrupt: pin A routed to IRQ 11
        Region 0: Memory at f8000000 (32-bit, non-prefetchable) [size=64M]

> What do you recommend doing here?

I think any of the above can be used.


- Haiyang

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