On Mon, Sep 23, 2024, Ivan Orlov wrote: > Currently, KVM may return a variety of internal errors to VMM when > accessing MMIO, and some of them could be gracefully handled on the KVM > level instead. Moreover, some of the MMIO-related errors are handled > differently in VMX in comparison with SVM, which produces certain > inconsistency and should be fixed. This patch series introduces > KVM-level handling for the following situations: > > 1) Guest is accessing MMIO during event delivery: triple fault instead > of internal error on VMX and infinite loop on SVM > > 2) Guest fetches an instruction from MMIO: inject #UD and resume guest > execution without internal error No. This is not architectural behavior. It's not even remotely close to architectural behavior. KVM's behavior isn't great, but making up _guest visible_ behavior is not going to happen.
