APPLIED: [PATCH 0/15][focal/linux-azure, jammy/linux-azure] Azure: Support multi-MSI

[Tim Gardner]

On 7/13/22 06:56, Tim Gardner wrote:
> BugLink: https://bugs.launchpad.net/bugs/1981577
> 
> SRU Justification
> 
> [Impact]
> 
> The Hyper-V vPCI driver (pci-hyperv) doesn't work with a PCIe devcie that
> supports multiple MSI interrupts (Note: MSI-X has been working fine). Recently
> Jeffrey Hugo <quic_jhugo at quicinc.com> made 4 patches to the vPCI driver so
> multiple-MSI can work now. Please consider picking up the 4 patches into the
> linux-azure kernels for Ubuntu LTS 18.04, 20.04 and 22.04:
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=08e61e861a0e47e5e1a3fb78406afd6b0cea6b6d
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=455880dfe292a2bdd3b4ad6a107299fce610e64b
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b4b77778ecc5bfbd4e77de1b2fd5c1dd3c655f1f
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a2bad844a67b1c7740bda63e87453baf63c3a7f7
> 
> Microsoft is working to bring up a Qualcomm PCIe device to Linux VMs running
> on Azure. We need the 4 patches for the device to work on Azure/Hyper-V.
> 
> The 5.4 kernel patches are a mix of cherry picks and backports since cherry picking scaffold
> patches would have been too intrusive, whereas for the 5.15 kernel I chose
> some scaffolding patches in order to have all clean cherry picks.
> 
> [Test Plan]
> 
> Microsoft tested both 5.4 and 5.15 kernels.
> 
> [Where things could go wrong]
> 
> MSI vectors could be mis-wired or ignored.
> 
> [Other Info]
> 
> SF: #00339521
> 
Applied to f/j linux-azure/master-next. Thanks.

-rtg

-- 
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Tim Gardner
Canonical, Inc