Re: [Qemu-devel] [RFC][PATCH 1/2] kvm: Introduce basic MSI support in-kernel irqchips

[Avi Kivity]

On 03/22/2012 01:17 AM, Jan Kiszka wrote:
> From: Jan Kiszka <address@hidden>
>
> This patch basically adds kvm_irqchip_send_msi, a service for sending
> arbitrary MSI messages to KVM's in-kernel irqchip models.
>
> As the current KVI API requires us to establish a static route from a

s/KVI/KVM/

> pseudo GSI to the target MSI message and inject the MSI via toggling
> that GSI, we need to play some tricks to make this unfortunately

s/unfortunately/unfortunate/

> interface transparent. We create those routes on demand and keep them
> in a hash table. Succeeding messages can then search for an existing
> route in the table first and reuse it whenever possible. If we should
> run out of limited GSIs, we simply flush the table and rebuild it as
> messages are sent.
>
> This approach is rather simple and could be optimized further. However,
> it is more efficient to enhance the KVM API so that we do not need this
> clumsy dynamic routing over futures kernels.

Two APIs are clumsier than one.

wet the patch itself, suggest replacing the home grown hash with
http://developer.gnome.org/glib/2.30/glib-Caches.html.   

-- 
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