Re: [PATCH v2 2/3] driver: provide sysfs interfaces to access TXT config space
On Fri 2013-05-17 08:50:11, Ren, Qiaowei wrote: > On 2013-05-17, Pavel Machek wrote: > > On Tue 2013-05-14 01:24:43, Qiaowei Ren wrote: > >> +What: /sys/devices/platform/intel_txt/config/STS_raw +Date: > >> May 2013 > >> +KernelVersion:3.9 +Contact: "Qiaowei Ren" > >> +Description: TXT.STS is the general status register. This read-only > >> register + is used by AC modules and the MLE to get the status of > >> various + Intel TXT features. > > > > This is not enough to allow people to understand what this does/should > > do, nor does it allow (for example) ARM people to implement something > > compatible. > > Currently TXT is only a technology for safer computing provided by Intel. I > am absolutely not sure whether similar technology will be provided on ARM or > other platform in future. But I guess I don't have to consider those future > possible implementation on ARM or other platform. :) > You still have to properly design the interface and properly document it, so people can understand and test it, and develop compatible implementations. Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
RE: [PATCH v2 2/3] driver: provide sysfs interfaces to access TXT config space
On 2013-05-17, Pavel Machek wrote: > On Tue 2013-05-14 01:24:43, Qiaowei Ren wrote: >> +What: /sys/devices/platform/intel_txt/config/STS_raw +Date: >> May 2013 >> +KernelVersion: 3.9 +Contact: "Qiaowei Ren" >> +Description:TXT.STS is the general status register. This read-only >> register + is used by AC modules and the MLE to get the status of >> various +Intel TXT features. > > This is not enough to allow people to understand what this does/should > do, nor does it allow (for example) ARM people to implement something > compatible. Currently TXT is only a technology for safer computing provided by Intel. I am absolutely not sure whether similar technology will be provided on ARM or other platform in future. But I guess I don't have to consider those future possible implementation on ARM or other platform. :) Thanks, Qiaowei -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: [PATCH v2 2/3] driver: provide sysfs interfaces to access TXT config space
On Tue 2013-05-14 01:24:43, Qiaowei Ren wrote: > These interfaces are located in /sys/devices/platform/intel_txt/config, > and including totally 37 files, providing access to Intel TXT > configuration registers. This looks like very wrong interface... equivalent of /dev/mem. > +What:/sys/devices/platform/intel_txt/config/STS_raw > +Date:May 2013 > +KernelVersion: 3.9 > +Contact: "Qiaowei Ren" > +Description: TXT.STS is the general status register. This read-only register > + is used by AC modules and the MLE to get the status of various > + Intel TXT features. This is not enough to allow people to understand what this does/should do, nor does it allow (for example) ARM people to implement something compatible. Is there specific reason why "better" interface is impossible? Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
RE: [PATCH v2 2/3] driver: provide sysfs interfaces to access TXT config space
On 2013-05-14, Matthew Garrett wrote:
> On Tue, 2013-05-14 at 01:24 +0800, Qiaowei Ren wrote:
> > These interfaces are located
> > in /sys/devices/platform/intel_txt/config,
> > and including totally 37 files, providing access to Intel TXT
> > configuration registers.
>
> Do you have any example userspace code using these features?
You mean test programs using these sysfs files? Currently I just did some
simple demos like the following:
cat config/STS_private_open
echo 1 > CMD_CLOSE_PRIVATE
cat config/STS_private_open
cat config/STS_ locality_1_open
echo 1 > CMD_CLOSE_LOCALITY1
cat config/ STS_ locality_1_open
echo 1 > CMD_OPEN_LOCALITY1
cat config/ STS_ locality_1_open
Thanks,
Qiaowei
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Re: [PATCH v2 2/3] driver: provide sysfs interfaces to access TXT config space
On Tue, 2013-05-14 at 01:24 +0800, Qiaowei Ren wrote:
> These interfaces are located
> in /sys/devices/platform/intel_txt/config,
> and including totally 37 files, providing access to Intel TXT
> configuration registers.
Do you have any example userspace code using these features?
--
Matthew Garrett | mj...@srcf.ucam.org
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