Re: [PATCH 2/2] kvm tools: inject MSI directly without going through a GSI

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On 08/05/2012 11:08 AM, Pekka Enberg wrote:
> On 08/04/2012 01:02 PM, Pekka Enberg wrote:
>>> No, it's not running 3.5. We need to support older *host* kernels,
>>> though.
> 
> On Sun, Aug 5, 2012 at 10:02 AM, Sasha Levin <levinsasha928@xxxxxxxxx> wrote:
>> Do we? Don't we need to support just the kernel that the tool was
>> built with?
> 
> We only do that for *guest kernels* if we have to but we've always been
> compatible with older host kernels.
> 
> Isn't there a capability flag that KVM sets if KVM_SIGNAL_MSI is
> supported? Just store that in 'struct kvm" and switch between
> virtio_pci__signal_msi() and kvm__irq_trigger() depending on wheter the
> flag is set.

There is, but we've broken backwards compatibility for guests several times before as well - which is why I assumed thats fine.

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