2016-04-14 16:42+0200, Paolo Bonzini: > On 14/04/2016 15:33, Radim Krčmář wrote: >> The main bug in KVM is that it allows the guest to think that it runs on >> CPU that isn't emulated: any CPU that has MSR_PLATFORM_INFO shouldn't >> be exposed in KVM. > > That's all of them. f/m/s values and the model name are a useful > debugging tool. Considering that MSR_PLATFORM_INFO is hardly ever used, > it doesn't seem to be a great compromise. I don't see that as a compromise. igd would fail even if we fixed the host side, so we'll have problems regardless of what we do. We have a bug, because certain v/f/m/s implies some features (MSRs, constant_tsc, ...) and those aren't emulated. I do agree that we don't want to fix the bug, either by whitelisting and emulating features that makes little sense in virt or by forcing guests to adopt new v/f/m/s (the latter option is more reasonable), because rare occurences of the bug take *much* less work to fix on the guest side. (The only part I'm concerned about is that we don't have a good excuse for some guest errors ...) -- 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
