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Re: [PATCH v3] xen/mem_sharing: support forks with active vPMU state
- To: Tamas K Lengyel <tamas.lengyel@xxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <Andrew.Cooper3@xxxxxxxxxx>
- Date: Thu, 21 Jul 2022 15:15:54 +0000
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- Cc: Jan Beulich <jbeulich@xxxxxxxx>, Roger Pau Monne <roger.pau@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Jun Nakajima <jun.nakajima@xxxxxxxxx>, Kevin Tian <kevin.tian@xxxxxxxxx>, Tamas K Lengyel <tamas@xxxxxxxxxxxxx>, George Dunlap <George.Dunlap@xxxxxxxxxx>
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- Thread-topic: [PATCH v3] xen/mem_sharing: support forks with active vPMU state
On 21/07/2022 15:42, Tamas K Lengyel wrote:
> Currently the vPMU state from a parent isn't copied to VM forks. To enable the
> vPMU state to be copied to a fork VM we export certain vPMU functions. First,
> the vPMU context needs to be allocated for the fork if the parent has one. For
> this we introduce vpmu->allocate_context, which has previously only been
> called
> when the guest enables the PMU on itself. Furthermore, we export
> vpmu_save_force so that the PMU context can be saved on-demand even if no
> context switch took place on the parent's CPU yet. Additionally, we make sure
> all relevant configuration MSRs are saved in the vPMU context so the copy is
> complete and the fork starts with the same PMU config as the parent.
>
> Signed-off-by: Tamas K Lengyel <tamas.lengyel@xxxxxxxxx>
Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
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