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

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Date:   Thu, 17 Mar 2022 10:59:29 +0100
From:   Greg KH <greg@...ah.com>
To:     Steffen Eiden <seiden@...ux.ibm.com>
Cc:     agordeev@...ux.ibm.com, borntraeger@...ux.ibm.com,
        david@...hat.com, frankja@...ux.ibm.com, gor@...ux.ibm.com,
        hca@...ux.ibm.com, imbrenda@...ux.ibm.com, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        linux-s390@...r.kernel.org, nrb@...ux.ibm.com, shuah@...nel.org
Subject: Re: [PATCH v3 1/4] drivers/s390/char: Add Ultravisor io device'

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@...ux.ibm.com>
> Reviewed-by: Janosch Frank <frankja@...ux.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.

thanks,

greg k-h