[Bug 1933179] Re: [22.04 FEAT] KVM: Enable storage key checking for intercepted instruction handled by userspace

This bug is already Fix Released and closed and was requested for jammy only.
So it wasn't requested for focal, hence updating the tags to 'verification-done-focal' to unblock any processes.

** Tags removed: verification-needed-focal
** Tags added: verification-done-focal

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Title:
[22.04 FEAT] KVM: Enable storage key checking for intercepted
instruction handled by userspace

Status in Ubuntu on IBM z Systems:
Fix Released
Status in linux package in Ubuntu:
Fix Released

Bug description:
KVM uses lazy storage key enablement as Linux does no longer make use of the storage keys. When the guest enters keyed mode, then KVM will save/restore the key during paging, provide change/reference tracking for guest and host and for all interpreted instructions will do key protection.
If an instruction is intercepted and passed along to userspace (like QEMU) no storage key protection is checked, though. This is in violation of the architecture and it can result in misbehaving guests that rely on key protection for all instructions.
This item will improve the MEMOP ioctl to also add key checking. In case of a key protection the right fault is injected in the guest.

Value: Interoperability

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