[PATCH 4.14 0/4] PCI: hv: Fix multi-MSI and IRTE allocation

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Hyper-V driver has advertised support for multi-MSI, but any attempt at
using the feature would fallback to a single MSI (non-starter for
devices that require multi-MSI). The fallback also covered up other
bugs related to multi-MSI functionality rooted in the driver not being
able to tell MSIs apart.

These patches fix those bugs by enabling hv multi-MSI through IOMMU
remapping, distinguishing multi-MSIs from the initial MSI of the MSI
block, preventing retargeting of MSI subsets from invalidating the IRTE
block, and aiding hypervisor to preserve the block of requests.

Tested on 4.14.288

Jeffrey Hugo (4):
  PCI: hv: Fix multi-MSI to allow more than one MSI vector
  PCI: hv: Fix hv_arch_irq_unmask() for multi-MSI
  PCI: hv: Reuse existing IRTE allocation in compose_msi_msg()
  PCI: hv: Fix interrupt mapping for multi-MSI

 drivers/pci/controller/pci-hyperv.c | 99 +++++++++++++++++++++--------
 1 file changed, 73 insertions(+), 26 deletions(-)

-- 
2.25.1




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