Re: [PATCH v4 04/10] KVM/x86: intel_pmu_lbr_enable

From: Jim Mattson
Date: Wed Jan 02 2019 - 18:27:21 EST

On Wed, Dec 26, 2018 at 2:01 AM Wei Wang <> wrote:
> The lbr stack is architecturally specific, for example, SKX has 32 lbr
> stack entries while HSW has 16 entries, so a HSW guest running on a SKX
> machine may not get accurate perf results. Currently, we forbid the
> guest lbr enabling when the guest and host see different lbr stack
> entries.

How do you handle live migration?