Messages in this thread | | | Date | Thu, 17 Mar 2022 12:07:58 +0100 | Subject | Re: [PATCH v3 1/4] drivers/s390/char: Add Ultravisor io device | From | Steffen Eiden <> |
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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@linux.ibm.com> >> Reviewed-by: Janosch Frank <frankja@linux.ibm.com> > > 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@linux.ibm.com/
> thanks, > > greg k-h >
steffen
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