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From: Ken Goldman <kgold@linux.vnet.ibm.com>
To: unlisted-recipients:; (no To-header on input)
Cc: linux-ima-devel@lists.sourceforge.net,
	linux-security-module@vger.kernel.org,
	tpmdd-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org
Subject: Re: [tpmdd-devel] [PATCH] tpm: improve tpm_tis send() performance by ignoring burstcount
Date: Tue, 15 Aug 2017 18:02:57 -0400	[thread overview]
Message-ID: <869cc1b1-0836-a53b-31d7-9fec50d8cc52@linux.vnet.ibm.com> (raw)
In-Reply-To: <20170814015359.30177c87@naga>

On 8/13/2017 7:53 PM, msuchanek wrote:
> About 500 out of 700 mainboards sold today has a PS/2 port which is
> probably due to prevalence of legacy devices and usbhid limitations.
> 
> Similarily many boards have serial and parallel hardware ports.
> 
> In all diagrams detailed enough to show these ports I have seen them
> attached to the LPC bus.

Do these boards have a TPM?  Remember that the TPM requires special LPC 
bus cycles.

Even if so, the TPM LPC bus wait states are less than a usec.  My 
thought is that  it's unlikely that any device (serial port, mouse, 
keyboard, printer) will be adversely affected.

  reply	other threads:[~2017-08-15 22:02 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-08-07 11:46 [PATCH] tpm: improve tpm_tis send() performance by ignoring burstcount Nayna Jain
2017-08-07 11:52 ` Peter Huewe
2017-08-07 14:25   ` Nayna
2017-08-08 21:50     ` Jarkko Sakkinen
2017-08-08 19:11   ` Jarkko Sakkinen
2017-08-09 20:23     ` [tpmdd-devel] " Ken Goldman
2017-08-09 20:43       ` Aw: " Peter Huewe
2017-08-11 21:54         ` Ken Goldman
     [not found]           ` <20170814101046.5hqrkaqmfvl7ugwj@linux.intel.com>
2017-08-16 19:51             ` Ken Goldman
2017-08-09 20:25     ` Ken Goldman
2017-08-09 21:00       ` Aw: " Peter Huewe
2017-08-11 11:14         ` Jarkko Sakkinen
2017-08-11 15:30           ` Mimi Zohar
2017-08-14 10:51             ` Jarkko Sakkinen
2017-08-14 10:56               ` Jarkko Sakkinen
2017-08-14 12:03                 ` Mimi Zohar
2017-08-15  6:08                   ` Jarkko Sakkinen
2017-08-14 12:12                 ` Mimi Zohar
2017-08-15  6:09                   ` Jarkko Sakkinen
2017-08-11 21:32         ` Aw: " Ken Goldman
2017-08-13 23:53           ` msuchanek
2017-08-15 22:02             ` Ken Goldman [this message]
2017-08-16 10:24               ` Michal Suchánek
2017-08-11 21:42       ` [Linux-ima-devel] " Ken Goldman
2017-08-08 19:07 ` Jarkko Sakkinen

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