Messages in this thread | | | Date | Thu, 17 Mar 2022 12:23:16 +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 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@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/ > 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
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