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 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 qiaowei@intel.com +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 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 qiaowei@intel.com +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 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 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 qiaowei@intel.com +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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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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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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