Comment 0 for bug 1962831
Revision history for this message
| bugproxy (bugproxy) wrote [UBUNTU 20.04] KVM: Enable storage key checking for intercepted instruction (Backport to focal) | #0 |
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0f7b58d
(Get the code!)
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 add the missing key checking to MEMOP ioctl.