Re: [Xen-devel] vTPM Manager shuts down

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Wed, May 22, 2013 at 07:14:04PM +0000, Ross Philipson wrote:
> > -----Original Message-----
> > From: xen-devel-bounces@xxxxxxxxxxxxx [mailto:xen-devel-
> > bounces@xxxxxxxxxxxxx] On Behalf Of Ross Philipson
> > Sent: Wednesday, May 22, 2013 3:06 PM
> > To: Konrad Rzeszutek Wilk; Daniel De Graaf
> > Cc: Jordi Cucurull Juan; xen-devel@xxxxxxxxxxxxx
> > Subject: Re: [Xen-devel] vTPM Manager shuts down
> > 
> > > -----Original Message-----
> > > From: xen-devel-bounces@xxxxxxxxxxxxx [mailto:xen-devel-
> > > bounces@xxxxxxxxxxxxx] On Behalf Of Konrad Rzeszutek Wilk
> > > Sent: Wednesday, May 22, 2013 2:00 PM
> > > To: Daniel De Graaf
> > > Cc: Jordi Cucurull Juan; xen-devel@xxxxxxxxxxxxx
> > > Subject: Re: [Xen-devel] vTPM Manager shuts down
> > >
> > > > (XEN) General information for domain 5:
> > > > (XEN)     refcnt=3 dying=0 pause_count=0
> > > > (XEN)     nr_pages=7168 xenheap_pages=5 shared_pages=0 paged_pages=0
> > > dirty_cpus={} max_pages=7424
> > > > (XEN)     handle=3097d8b9-8d80-4bde-94b6-978c98c37296
> > > vm_assist=00000000
> > > > (XEN) Rangesets belonging to domain 5:
> > > > (XEN)     I/O Ports  { }
> > > > (XEN)     Interrupts { }
> > > > (XEN)     I/O Memory { fed40 }
> > > >
> > > > Note: my config contains "iomem=['fed40,1']" not "iomem=['fed40,5']"
> > > so your
> > > > output will differ there.
> > >
> > > Is that address (fed40) standard? Are there other TPM devices at other
> > > locations?
> > 
> > Yes that is defined in the TCG's TPM spec. That is the beginning of the
> > PCRs
> > for locality 0 and they range up to locality 4: FED4_0xxxh - FED4_4xxxh
> > 
> > If you search for something like TCG_PCClientTPMSpecification_1-21_1-
> > 00_FINAL.pdf
> > you can find that information (chapter 9 is on locality).
> > 
> > > How does one find them? lspci?
> > 
> > The TPM lives on the LPC bus. Some of its features are exported in
> > sysfs:
> > 
> > /sys/class/misc/tpm0
> 
> Oh and sorry I sent it before I finished what I was going to say. You can
> find information about it in ACPI. E.g. this Dell I have has a Broadcom
> 1.2 TPM:
> 
>     Device (\_SB.PCI0.LPCB.TPM)
>     {
>         Name (_HID, EisaId ("BCM0102"))
>         Name (_CID, 0x310CD041)
>         Name (_STR, Unicode ("TPM 1.2 Device"))
>         Name (_CRS, ResourceTemplate ()
>         {
>             Memory32Fixed (ReadOnly,
>                 0xFED40000,         // Address Base
>                 0x00005000,         // Address Length
>                 )
>         })
>         ...
>     }

Would it make sense to have libxl when creating one of the TPM manager
domains to automatically get that info from /sys/class/misc/tpm0?

Hm, I guess it wouldn't really work unless you added some new
config option called 'vtpm_manager=1' to do this.

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