Jamie Lokier wrote: > john cooper wrote: >> As before a cpu feature 'check' option is added which warns when >> feature flags (either implicit in a cpu model or explicit on the >> command line) would have otherwise been quietly unavailable to a >> guest: >> >> # qemu-system-x86_64 ... -cpu Nehalem,check >> warning: host cpuid 0000_0001 lacks requested flag 'sse4.2' [0x00100000] >> warning: host cpuid 0000_0001 lacks requested flag 'popcnt' [0x00800000] > > That's a nice feature. Can we have a 'checkfail' option which refuses > to run if a requested capability isn't available? Thanks. Certainly, others have requested the same. Let's resolve the issue at hand first. > I foresee wanting to iterate over the models and pick the latest one > which a host supports - on the grounds that you have done the hard > work of ensuring it is a reasonably good performer, while "probably" > working on another host of similar capability when a new host is made > available. That's a fairly close use case to that of safe migration which was one of the primary motivations to identify the models being discussed. Although presentation and administration of such was considered the domain of management tools. -john -- john.cooper@xxxxxxxxxx -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
