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+windows qemu-img create vpc/vhdx error
+
+On windows, using qemu-img (version 2.11.90) to create vpc/vhdx virtual disk tends to fail. Here's the way to reproduce:
+
+1. Install qemu-w64-setup-20180321.exe
+
+2. Use `qemu-img create -f vhdx -o subformat=fixed disk.vhdx 512M` to create a vhdx:
+   Formatting 'disk.vhdx', fmt=vhdx size=536870912 log_size=1048576 block_size=0 subformat=fixed
+
+3. Execute `qemu-img info disk.vhdx` gives the result, (note the `disk size` is incorrect):
+   image: disk.vhdx
+   file format: vhdx
+   virtual size: 512M (536870912 bytes)
+   disk size: 1.4M
+   cluster_size: 8388608
+
+4. On Windows 10 (V1709), double click disk.vhdx gives an error:
+   Make sure the file is in an NTFS volume and isn't in a compressed folder or volume.
+
+   Using Disk Management -> Action -> Attach VHD gives an error:
+   The requested operation could not be completed due to a virtual disk system limitation. Virtual hard disk files must be uncompressed and uneccrypted and must not be sparse.
+
+Comparison with Windows 10 created VHDX:
+
+1. Using Disk Management -> Action -> Create VHD:
+   File name: win.vhdx
+   Virtual hard disk size: 512MB
+   Virtual hard disk format: VHDX
+   Virtual hard disk type: Fixed size
+
+2. Detach VHDX
+
+3. Execute `qemu-img info win.vhdx` gives the result:
+   image: win.vhdx
+   file format: vhdx
+   virtual size: 512M (536870912 bytes)
+   disk size: 516M
+   cluster_size: 33554432
+
+Comparison with qemu-img under Ubuntu:
+
+1. Version: qemu-img version 2.5.0 (Debian 1:2.5+dfsg-5ubuntu10.16), Copyright (c) 2004-2008 Fabrice Bellard
+
+2. qemu-img create -f vhdx -o subformat=fixed lin.vhdx 512M
+   Formatting 'lin.vhdx', fmt=vhdx size=536870912 log_size=1048576 block_size=0 subformat=fixed
+
+3. qemu-img info lin.vhdx
+   image: lin.vhdx
+   file format: vhdx
+   virtual size: 512M (536870912 bytes)
+   disk size: 520M
+   cluster_size: 8388608
+
+4. Load lin.vhdx under Windows 10 is ok
+
+The same thing happens on `vpc` format with or without `oformat=fixed`, it seems that windows version of qemu-img has some incorrect operation? My guess is that windows version of qemu-img doesn't handle the description field of vpc/vhdx, which leads to an incorrect `disk size` field.
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