Re: [PATCH v3 1/4] drivers/s390/char: Add Ultravisor io device

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Hi greg,

On 3/17/22 12:07, Steffen Eiden wrote:
Hi greg,

On 3/17/22 10:59, Greg KH wrote:
On Thu, Mar 17, 2022 at 09:47:06AM +0000, Steffen Eiden wrote:
This patch adds a new miscdevice to expose some Ultravisor functions
to userspace. Userspace can send IOCTLs to the uvdevice that will then
emit a corresponding Ultravisor Call and hands the result over to
userspace. The uvdevice is available if the Ultravisor Call facility is
present.
Userspace can call the Retrieve Attestation Measurement
Ultravisor Call using IOCTLs on the uvdevice.

The uvdevice will do some sanity checks first.
Then, copy the request data to kernel space, build the UVCB,
perform the UV call, and copy the result back to userspace.

Signed-off-by: Steffen Eiden <seiden@xxxxxxxxxxxxx>
Reviewed-by: Janosch Frank <frankja@xxxxxxxxxxxxx>

Do you have a pointer to the userspace code that interacts with this
kernel driver?  That would be good to have to verify that the api here
is sane.

There is a userspace tool currently under development, however, not yet ready to be published. Currently, I can only point to the Kselftest in this series and the kvm-unit-tests at https://lore.kernel.org/linux-s390/20220203091935.2716-1-seiden@xxxxxxxxxxxxx/
I forgot to point out that the Attestation userspace tool will be open-source and included in the s390-tool package.
I can send you the current state of that tool in private if you want.



thanks,

greg k-h


steffen

steffen



[Index of Archives]     [Linux Wireless]     [Linux Kernel]     [ATH6KL]     [Linux Bluetooth]     [Linux Netdev]     [Kernel Newbies]     [Share Photos]     [IDE]     [Security]     [Git]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Linux ATA RAID]     [Samba]     [Device Mapper]

  Powered by Linux