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SubjectRe: [PATCH v4 04/10] KVM/x86: intel_pmu_lbr_enable
On 01/03/2019 07:26 AM, Jim Mattson wrote:
> 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?

This feature is gated by the QEMU "lbr=true" option.
So if the lbr fails to work on the destination machine,
the destination side QEMU wouldn't be able to boot,
and migration will not happen.


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