Messages in this thread | ![/](/images/icornerl.gif) | | Date | Wed, 2 Mar 2022 11:46:38 +0100 | Subject | Re: [PATCH v2 1/3] drivers/s390/char: Add Ultravisor io device | From | Steffen Eiden <> |
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On 3/2/22 11:34, Janosch Frank wrote: > On 2/23/22 15:48, 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 is now able to call the Query Ultravisor Information >> Ultravisor Command through the uvdevice. >> >> Signed-off-by: Steffen Eiden <seiden@linux.ibm.com> >> --- [...] >> + >> +config S390_UV_UAPI >> + def_tristate y >> + prompt "Ultravisor userspace API" >> + depends on PROTECTED_VIRTUALIZATION_GUEST > > Please drop the dependency. > We want this to be available to both guest and host as QUI is available > in both environments and more calls like this could follow. > > We could put an option around the attestation but the savings are not > worth the effort.
Makes sense. I will drop the dependency in v3.
Steffen
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