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Re: [tpmdd-devel] [PATCH v2 4/7] tpm: infrastructure for TPM spaces

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On 2/21/2017 1:24 PM, Nayna wrote:
>
> [snip]
>>
>> 1. Take locks.
>> 2. Load transient objects from the backing storage by using ContextLoad
>>     and map virtual handles to physical handles.
>> 3. Perform the transaction.
>> 4. Save transient objects to backing storage by using ContextSave and
>>     map resulting physical handle to virtual handle if there is such.
>>
>> This commit does not implement virtualization support for hmac and
>> policy sessions.
>>
>
> If I have understood discussions correctly, I assume, that kernel TPM
> operations will also be routed via RM. And I think that is not happening
> now with these patches.

There is one corner case that requires kernel operations to go through
the RM, and that's the session context regapping.  If the kernel did not 
go through the RM, it could not handle TPM_RC_CONTEXT_GAP.

I believe that kernel operations such as PCR extend, that don't require
sessions, do not have to go through the RM.

Kernel operations that use objects perhaps can bypass the RM as long as 
there is a lock and the kernel also context saves objects and returns 
the TPM to the empty state before it releases the lock.

Finally, I suspect that the RM should reserve 3 sessions for kernel
operations, so the kernel can't block because user space applications 
have filled all the session slots.

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[PATCH v2 0/7] in-kernel resource manager Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> - 2017-02-16 20:30 +0100
  [PATCH v2 1/7] tpm: move length validation to tpm_transmit() Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> - 2017-02-16 20:30 +0100
  [PATCH v2 7/7] tpm2: add session handle context saving and restoring to the space code Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> - 2017-02-16 20:30 +0100
    Re: [PATCH v2 7/7] tpm2: add session handle context saving and  restoring to the space code Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> - 2017-02-23 10:10 +0100
  [PATCH v2 6/7] tpm: expose spaces via a device link /dev/tpms<n> Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> - 2017-02-16 20:30 +0100
    Re: [PATCH v2 6/7] tpm: expose spaces via a device link /dev/tpms<n> Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> - 2017-02-23 10:10 +0100
      Re: [PATCH v2 6/7] tpm: expose spaces via a device link /dev/tpms<n> James Bottomley <James.Bottomley@HansenPartnership.com> - 2017-02-24 14:10 +0100
        Re: [PATCH v2 6/7] tpm: expose spaces via a device link /dev/tpms<n> Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> - 2017-02-24 18:40 +0100
          Re: [PATCH v2 6/7] tpm: expose spaces via a device link /dev/tpms<n> Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2017-02-24 19:20 +0100
            Re: [PATCH v2 6/7] tpm: expose spaces via a device link /dev/tpms<n> James Bottomley <James.Bottomley@HansenPartnership.com> - 2017-02-24 21:30 +0100
              Re: [PATCH v2 6/7] tpm: expose spaces via a device link /dev/tpms<n> Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2017-02-24 22:00 +0100
                Re: [tpmdd-devel] [PATCH v2 6/7] tpm: expose spaces via a device  link /dev/tpms<n> James Bottomley <James.Bottomley@HansenPartnership.com> - 2017-02-25 00:10 +0100
                Re: [tpmdd-devel] [PATCH v2 6/7] tpm: expose spaces via a device  link /dev/tpms<n> Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2017-02-25 00:30 +0100
                Re: [tpmdd-devel] [PATCH v2 6/7] tpm: expose spaces via a device  link /dev/tpms<n> James Bottomley <James.Bottomley@HansenPartnership.com> - 2017-02-25 00:50 +0100
                Re: [tpmdd-devel] [PATCH v2 6/7] tpm: expose spaces via a device  link /dev/tpms<n> Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2017-02-25 01:30 +0100
                Re: [tpmdd-devel] [PATCH v2 6/7] tpm: expose spaces via a device  link /dev/tpms<n> James Bottomley <James.Bottomley@HansenPartnership.com> - 2017-02-25 18:10 +0100
                Re: [tpmdd-devel] [PATCH v2 6/7] tpm: expose spaces via a device  link /dev/tpms<n> Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2017-02-27 18:40 +0100
        Re: [PATCH v2 6/7] tpm: expose spaces via a device link /dev/tpms<n> Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> - 2017-02-26 12:50 +0100
          Re: [PATCH v2 6/7] tpm: expose spaces via a device link /dev/tpms<n> "Dr. Greg Wettstein" <greg@enjellic.com> - 2017-02-26 19:40 +0100
            Re: [PATCH v2 6/7] tpm: expose spaces via a device link /dev/tpms<n> Ken Goldman <kgold@linux.vnet.ibm.com> - 2017-02-28 20:00 +0100
          Re: [PATCH v2 6/7] tpm: expose spaces via a device link /dev/tpms<n> Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2017-02-27 18:40 +0100
    Re: [tpmdd-devel] [PATCH v2 6/7] tpm: expose spaces via a device link  /dev/tpms<n> Nayna <nayna@linux.vnet.ibm.com> - 2017-02-24 08:10 +0100
      Re: [tpmdd-devel] [PATCH v2 6/7] tpm: expose spaces via a device  link /dev/tpms<n> James Bottomley <James.Bottomley@HansenPartnership.com> - 2017-02-24 14:00 +0100
        Re: [tpmdd-devel] [PATCH v2 6/7] tpm: expose spaces via a device link  /dev/tpms<n> Nayna <nayna@linux.vnet.ibm.com> - 2017-02-27 12:50 +0100
          Re: [tpmdd-devel] [PATCH v2 6/7] tpm: expose spaces via a device  link /dev/tpms<n> James Bottomley <James.Bottomley@HansenPartnership.com> - 2017-02-27 16:10 +0100
  [PATCH v2 4/7] tpm: infrastructure for TPM spaces Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> - 2017-02-16 20:30 +0100
    Re: [tpmdd-devel] [PATCH v2 4/7] tpm: infrastructure for TPM spaces Nayna <nayna@linux.vnet.ibm.com> - 2017-02-21 19:30 +0100
      Re: [tpmdd-devel] [PATCH v2 4/7] tpm: infrastructure for TPM spaces James Bottomley <James.Bottomley@HansenPartnership.com> - 2017-02-22 18:40 +0100
        Re: [tpmdd-devel] [PATCH v2 4/7] tpm: infrastructure for TPM spaces Ken Goldman <kgold@linux.vnet.ibm.com> - 2017-02-22 22:00 +0100
      Re: [tpmdd-devel] [PATCH v2 4/7] tpm: infrastructure for TPM spaces Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> - 2017-02-22 22:20 +0100
      Re: [tpmdd-devel] [PATCH v2 4/7] tpm: infrastructure for TPM spaces Ken Goldman <kgold@linux.vnet.ibm.com> - 2017-02-22 22:30 +0100
    Re: [PATCH v2 4/7] tpm: infrastructure for TPM spaces James Bottomley <James.Bottomley@HansenPartnership.com> - 2017-02-24 14:00 +0100
      Re: [PATCH v2 4/7] tpm: infrastructure for TPM spaces Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> - 2017-02-24 18:10 +0100

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