Merge remote-tracking branch 'mst/tags/for_anthony' into staging

virtio,pci infrastructure

This includes infrastructure patches that don't do much by themselves
but should help vfio and q35 make progress.
Also included is rework of virtio-net to use iovec APIs
for vector access - helpful to make it more secure
and in preparation for a new feature that will allow
arbitrary s/g layout for guests.
Also included is a pci bridge bugfix by Avi.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

* mst/tags/for_anthony: (25 commits)
  pci: avoid destroying bridge address space windows in a transaction
  virtio-net: enable mrg buf header in tap on linux
  virtio-net: test peer header support at init time
  virtio-net: minor code simplification
  virtio-net: simplify rx code
  virtio-net: switch tx to safe iov functions
  virtio-net: first s/g is always at start of buf
  virtio-net: refactor receive_hdr
  virtio-net: use safe iov operations for rx
  virtio-net: avoid sg copy
  iov: add iov_cpy
  virtio-net: track host/guest header length
  pcie: Convert PCIExpressHost to use the QOM.
  pcie: pass pcie window size to pcie_host_mmcfg_update()
  pci: Add class 0xc05 as 'SMBus'
  pci: introduce pci_swizzle_map_irq_fn() for standardized interrupt pin swizzle
  pci_ids: add intel 82801BA pci-to-pci bridge id
  pci: pci capability must be in PCI space
  pci: make each capability DWORD aligned
  qemu: enable PV EOI for qemu 1.3
  ...

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

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