Re: [RFC PATCH v2 1/1] platform-msi: Add platform check for subdevice irq domain
From: Lu Baolu <baolu.lu@linux.intel.com>
Date: 2021-01-07 02:05:03
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kvm, linux-pci, lkml
On 1/7/21 12:01 AM, Leon Romanovsky wrote:
On Wed, Jan 06, 2021 at 11:23:39AM -0400, Jason Gunthorpe wrote:quoted
On Wed, Jan 06, 2021 at 12:40:17PM +0200, Leon Romanovsky wrote:quoted
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