On Mon, Aug 24, 2026 at 5:40 AM Tina Zhang <[email protected]> wrote: > > Advertise DecodeAssists to L1 now that KVM virtualizes the > guest-visible DecodeAssist state in VMCB12: EXITINFO1 decode data for > MOV CR/DR, INTn, and INVLPG exits, plus instruction bytes for nested > page faults and intercepted #PF exits. INVLPGA's linear address remains > available directly from the saved guest rAX, as required by the APM. > > Expose the feature only when supported by hardware, as KVM still relies > on hardware DecodeAssists for VM-Exits that are reflected directly from > L2. > > With DecodeAssists exposed, QEMU configurations that require the feature > (e.g. "-cpu ...,+decodeassists,...,enforce") are no longer rejected. > > Signed-off-by: Tina Zhang <[email protected]>
Once the implementation issues are addressed... Reviewed-by: Jim Mattson <[email protected]>
