add launchpad bug reports without comments

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+PCIe cards passthrough to TCG guest works on 2GB of guest memory but fails on 4GB (vfio_dma_map invalid arg)
+
+During one meeting coworker asked "did someone tried to passthrough PCIe card to other arch guest?" and I decided to check it.
+
+Plugged SATA and USB3 controllers into spare slots on mainboard and started playing. On 1GB VM instance it worked (both cold- and hot-plugged). On 4GB one it did not:
+
+Błąd podczas uruchamiania domeny: internal error: process exited while connecting to monitor: 2020-03-25T13:43:39.107524Z qemu-system-aarch64: -device vfio-pci,host=0000:29:00.0,id=hostdev0,bus=pci.3,addr=0x0: VFIO_MAP_DMA: -22
+2020-03-25T13:43:39.107560Z qemu-system-aarch64: -device vfio-pci,host=0000:29:00.0,id=hostdev0,bus=pci.3,addr=0x0: vfio 0000:29:00.0: failed to setup container for group 28: memory listener initialization failed: Region mach-virt.ram: vfio_dma_map(0x563169753c80, 0x40000000, 0x100000000, 0x7fb2a3e00000) = -22 (Invalid argument)
+
+Traceback (most recent call last):
+  File "/usr/share/virt-manager/virtManager/asyncjob.py", line 75, in cb_wrapper
+    callback(asyncjob, *args, **kwargs)
+  File "/usr/share/virt-manager/virtManager/asyncjob.py", line 111, in tmpcb
+    callback(*args, **kwargs)
+  File "/usr/share/virt-manager/virtManager/object/libvirtobject.py", line 66, in newfn
+    ret = fn(self, *args, **kwargs)
+  File "/usr/share/virt-manager/virtManager/object/domain.py", line 1279, in startup
+    self._backend.create()
+  File "/usr/lib64/python3.8/site-packages/libvirt.py", line 1234, in create
+    if ret == -1: raise libvirtError ('virDomainCreate() failed', dom=self)
+libvirt.libvirtError: internal error: process exited while connecting to monitor: 2020-03-25T13:43:39.107524Z qemu-system-aarch64: -device vfio-pci,host=0000:29:00.0,id=hostdev0,bus=pci.3,addr=0x0: VFIO_MAP_DMA: -22
+2020-03-25T13:43:39.107560Z qemu-system-aarch64: -device vfio-pci,host=0000:29:00.0,id=hostdev0,bus=pci.3,addr=0x0: vfio 0000:29:00.0: failed to setup container for group 28: memory listener initialization failed: Region mach-virt.ram: vfio_dma_map(0x563169753c80, 0x40000000, 0x100000000, 0x7fb2a3e00000) = -22 (Invalid argument)
+
+
+I played with memory and 3054 MB is maximum value possible to boot VM with coldplugged host PCIe cards.
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