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SubjectRe: [RFC PATCH v2 1/1] platform-msi: Add platform check for subdevice irq domain
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On 1/7/21 12:01 AM, Leon Romanovsky wrote:
> On Wed, Jan 06, 2021 at 11:23:39AM -0400, Jason Gunthorpe wrote:
>> On Wed, Jan 06, 2021 at 12:40:17PM +0200, Leon Romanovsky wrote:
>>
>>> I asked what will you do when QEMU will gain needed functionality?
>>> Will you remove QEMU from this list? If yes, how such "new" kernel will
>>> work on old QEMU versions?
>>
>> The needed functionality is some VMM hypercall, so presumably new
>> kernels that support calling this hypercall will be able to discover
>> if the VMM hypercall exists and if so superceed this entire check.
>
> Let's not speculate, do we have well-known path?

All these (hypercall detect and invoke) will be done in
pci_subdevice_msi_create_irq_domain(). It will be transparent to the
callers.

> Will such patch be taken to stable@/distros?

It will not be taken to stable. For distros, it depends. They can
backport if they want to support the feature.

Best regards,
baolu

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