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Reproduced this bug with qemu-kvm-1.5.3-19.el7.x86_64
Steps:
1. Check manpage of qemu-img
# man qemu-img
---
Other
QEMU also supports various other image file formats for
compatibility with older QEMU versions or other hypervisors,
including VMDK, VDI, VHD (vpc), qcow1 and QED. For a full list of
supported formats see "qemu-img --help". For a more detailed
description of these formats, see the QEMU Emulation User
Documentation.
---
2. Check format under "drive"
# /usr/libexec/qemu-kvm -drive format=?
Supported formats: vvfat vpc vmdk vhdx vdi sheepdog sheepdog sheepdog raw host_cdrom host_floppy host_device file qed qcow2 qcow parallels nbd nbd nbd iscsi gluster gluster gluster gluster dmg cow cloop bochs blkverify blkdebug
From the manpage doc, no vhdx found, but under qemu-kvm cli, there're vhdx and vpc both.
So this bug is reproduced
Verify this bug with qemu-kvm-1.5.3-38.el7.x86_64
Steps:
1.Check manpage docs of qemu-img
# man qemu-img
...
Other
QEMU also supports various other image file formats for
compatibility with older QEMU versions or other hypervisors,
including VMDK, VDI, VHD (vpc), VHDX, qcow1 and QED. For a full
list of supported formats see "qemu-img --help". For a more
detailed description of these formats, see the QEMU Emulation User
Documentation.
...
2.Check format under "drive"
# /usr/libexec/qemu-kvm -drive format=?
Supported formats: vvfat vpc vmdk vhdx vdi sheepdog sheepdog sheepdog raw host_cdrom host_floppy host_device file qed qcow2 qcow parallels nbd nbd nbd iscsi gluster gluster gluster gluster dmg cow cloop bochs blkverify blkdebug
Result: Both manpage docs and qemu-kvm cli have "vpc" and "vhdx".
So according to above, this bug is fixed by qemu-kvm-1.5.3-38.el7.x86_64
This request was resolved in Red Hat Enterprise Linux 7.0.
Contact your manager or support representative in case you have further questions about the request.