[Bug 1912857] [NEW] virtio-serial blocks hostfwd ssh on windows 10 host

[Ven Karri]

Public bug reported:

qemu-system-x86_64 -display none -hda archlinux.qcow2 -m 4G -netdev
user,id=n1,hostfwd=tcp::2222-:22 -device virtio-net-pci,netdev=n1 -->
WORKS - meaning I can ssh into the vm via port 2222

qemu-system-x86_64 -display none -hda archlinux.qcow2 -m 4G -netdev
user,id=n1,hostfwd=tcp::2222-:22 -device virtio-net-pci,netdev=n1
-device virtio-serial -serial tcp:localhost:55298,server,nowait --> DOES
NOT WORK - meaning I cannot ssh into the vm

Not only does the port 2222 not work, but I am not able to perform any
serial transfer on port 55298 as well.

Host: Windows 10
Guest: archlinux
QEMU version 5.2

** Affects: qemu
     Importance: Undecided
         Status: New

** Description changed:

  qemu-system-x86_64 -display none -hda archlinux.qcow2 -m 4G -netdev
  user,id=n1,hostfwd=tcp::2222-:22 -device virtio-net-pci,netdev=n1 -->
  WORKS - meaning I can ssh into the vm via port 2222
  
  qemu-system-x86_64 -display none -hda archlinux.qcow2 -m 4G -netdev
  user,id=n1,hostfwd=tcp::2222-:22 -device virtio-net-pci,netdev=n1
  -device virtio-serial -serial tcp:localhost:55298,server,nowait --> DOES
  NOT WORK - meaning I cannot ssh into the vm
  
- Not only does the port 2222 work, but I am not able to perform any
+ Not only does the port 2222 not work, but I am not able to perform any
  serial transfer on port 55298 as well.
  
  Host: Windows 10
  Guest: archlinux
  QEMU version 5.2

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https://bugs.launchpad.net/bugs/1912857

Title:
  virtio-serial blocks hostfwd ssh on windows 10 host

Status in QEMU:
  New

Bug description:
  qemu-system-x86_64 -display none -hda archlinux.qcow2 -m 4G -netdev
  user,id=n1,hostfwd=tcp::2222-:22 -device virtio-net-pci,netdev=n1 -->
  WORKS - meaning I can ssh into the vm via port 2222

  qemu-system-x86_64 -display none -hda archlinux.qcow2 -m 4G -netdev
  user,id=n1,hostfwd=tcp::2222-:22 -device virtio-net-pci,netdev=n1
  -device virtio-serial -serial tcp:localhost:55298,server,nowait -->
  DOES NOT WORK - meaning I cannot ssh into the vm

  Not only does the port 2222 not work, but I am not able to perform any
  serial transfer on port 55298 as well.

  Host: Windows 10
  Guest: archlinux
  QEMU version 5.2

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