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Re: [Xen-devel] [PATCH v2 00/10] Per vcpu vm_event channels
- To: Tamas K Lengyel <tamas@xxxxxxxxxxxxx>
- From: Petre Ovidiu PIRCALABU <ppircalabu@xxxxxxxxxxxxxxx>
- Date: Wed, 17 Jul 2019 09:14:06 +0000
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- Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Razvan Cojocaru <rcojocaru@xxxxxxxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, George Dunlap <George.Dunlap@xxxxxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Ian Jackson <ian.jackson@xxxxxxxxxxxxx>, Tim Deegan <tim@xxxxxxx>, Julien Grall <julien.grall@xxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Alexandru Stefan ISAILA <aisaila@xxxxxxxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Wed, 17 Jul 2019 09:14:11 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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- Thread-topic: [PATCH v2 00/10] Per vcpu vm_event channels
On Tue, 2019-07-16 at 14:45 -0600, Tamas K Lengyel wrote:
> On Tue, Jul 16, 2019 at 11:06 AM Petre Pircalabu
> <ppircalabu@xxxxxxxxxxxxxxx> wrote:
> >
> > This patchset adds a new mechanism of sending synchronous vm_event
> > requests and handling vm_event responses without using a ring.
> > As each synchronous request pauses the vcpu until the corresponding
> > response is handled, it can be stored in a slotted memory buffer
> > (one per vcpu) shared between the hypervisor and the controlling
> > domain.
> >
> > The main advantages of this approach are:
> > * the ability to dynamicaly allocate the necessary memory used to
> > hold
> > the requests/responses (the size of
> > vm_event_request_t/vm_event_response_t
> > can grow unrestricted by the ring's one page limitation)
> > * the ring's waitqueue logic is unnecessary in this case because
> > the
> > vcpu sending the request is blocked until a response is received.
>
> Could you please push a git branch for this somewhere?
>
> Thanks,
> Tamas
I've pushed this changes to my github xen fork:
https://github.com/petrepircalabu/xen/tree/vm_event_ng/devel
The tag for patchset is per_cpu_vm_event_channels_v2.
Many thanks for your support,
Petre
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