** Changed in: ubuntu-z-systems
Status: In Progress => Fix Released
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https://bugs.launchpad.net/bugs/1933179
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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