Il 10/07/2014 14:17, Peter Maydell ha scritto:
More generally, there doesn't really seem to be provision in the KVM KVM_EXIT_MMIO API for returning "this access failed". I guess in theory userspace could do all the "figure out how to adjust CPU state to do exception entry and then run VCPU", but that seems like quite a lot of work which the kernel already knows how to do; is there some way to provide a simpler API that lets userspace just inform the kernel that it needs to fault the access?
There are 3 free padding bytes in struct kvm_run's mmio field. It's possible to add a per-VM capability and have the kernel check one of these bytes when the capability is set.
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