Merge tag 'pull-xenfv.for-upstream-20231107' of git://git.infradead.org/users/dwmw2...

Xen PV guest support for 8.2

Add Xen PV console and network support, the former of which enables the
Xen "PV shim" to be used to support PV guests.

Also clean up the block support and make it work when the user passes
just 'drive file=IMAGE,if=xen' on the command line.

Update the documentation to reflect all of these, taking the opportunity
to simplify what it says about q35 by making unplug work for AHCI.

Ignore the VCPU_SSHOTTMR_future timer flag, and advertise the 'fixed'
per-vCPU upcall vector support, as newer upstream Xen do.

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# gpg:                 aka "David Woodhouse <david@woodhou.se>" [unknown]
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* tag 'pull-xenfv.for-upstream-20231107' of git://git.infradead.org/users/dwmw2/qemu:
  docs: update Xen-on-KVM documentation
  xen-platform: unplug AHCI disks
  hw/i386/pc: support '-nic' for xen-net-device
  hw/xen: update Xen PV NIC to XenDevice model
  hw/xen: only remove peers of PCI NICs on unplug
  hw/xen: add support for Xen primary console in emulated mode
  hw/xen: update Xen console to XenDevice model
  hw/xen: do not repeatedly try to create a failing backend device
  hw/xen: add get_frontend_path() method to XenDeviceClass
  hw/xen: automatically assign device index to block devices
  hw/xen: populate store frontend nodes with XenStore PFN/port
  i386/xen: advertise XEN_HVM_CPUID_UPCALL_VECTOR in CPUID
  include: update Xen public headers to Xen 4.17.2 release
  hw/xen: Clean up event channel 'type_val' handling to use union
  i386/xen: Ignore VCPU_SSHOTTMR_future flag in set_singleshot_timer()

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>