On 20/02/2018 01:00, Van De Ven, Arjan wrote: >>> the guest is not the problem; guests obviously will already honor >>> if Enhanced IBRS is enumerated. The problem is mixed migration >>> pools where the hypervisor >>> may need to decide to not pass this enumeration through to the >>> guest. >> For bonus points: What should happen to a VM that is live migrated >> from one hypervisor to another, and the hypervisors have different >> IBRS support? > > Doctor Doctor it hurts when I do this.... > > Migration tends to only work between HV's that are relatively > homogeneous, that's nothing new... No Arjan, this is just wrong. Well, I suppose it's right in the present tense with the IBRS mess on Skylake, but it's _not_ been true until last year. Paolo
