Yes it should. Either for call stack LBR, or when it is frozen/disabled.From: Like Xu <like.xu@xxxxxxxxx>What about live migration? Does LBR stack need to be saved on the source side and
This patch adds support to KVM to save/restore the lbr stack on vCPU
When the guest sets the ACTIVE bit of MSR_KVM_PV_LBR_CTRL, a perf event
is created on the host for the related vCPU. This perf event ensures the
LBR stack to be saved/restored when the vCPU thread is scheduled out/in.
The perf event is removed and freed when the guest clears the ACTIVE
restored on the dest side with the passthrough mode?
When it's not frozen/disabled and not in call stack LBR mode it likely doesn't
hurt either, but it's not strictly needed because it will
be replaced so quickly.