Re: [libvirt] [Qemu-devel] [PATCH 00/16] usb-ccid (v18)

[adding libvir-list as well] On 02/07/2011 08:44 AM, Alon Levy wrote: >>> I guess I'll wait a little longer for more feedback? Should I split >>> the enum property separately? it's only used by ccid-card-emualted atm. >>> >> The only non-cosmetic concern I have about your series is the enum >> property so I would strongly suggest splitting it. If you did that >> for v19, it will be pretty close to merge ready. >> >> > Eric, > > How does this affect libvirt? could you assume a default set of backends > if "-device ccid-card-emulated,?" returns "backend=string" instead of > "backend=A/B" ? > Hmm. At the moment, libvirt only looks for "ccid-card-emulated" in the -device ? list, and hasn't yet tried inspecting -device ccid-card-emulated,? output. In short, libvirt assumes that the presence of ccid-card-emulated implies that both modes are available (libvirt's<smartcard mode='host'/> => backend=nss-emulated;<smartcard mode='host-certificates' => backend=certificates).

Is it possible for qemu to have support for one, but not both, of those modes? If that's the case, then supporting "backend=nss-emulated/certificates" in -device ccid-card-emulated,? would be handy for libvirt (for example, it would be just "backend=certificates" if nss-emulated is not available). But if it's an all-or-none approach (all backends are available if ccid-card-emulated is present), then libvirt's current code won't be impacted by changing the string to the simpler "backend=string".