Hello Stefan, I have spent a whole night to trace the code of block/vpc.c and compare against the VHD specifications (at http://www.microsoft.com/downloads/en/details.aspx?FamilyID=C2D03242-2FFB-48EF-A211-F0C44741109E&displaylang=en ). It seems that there isn't Fixed hard disk image and Differencing hard disk image support now. I am wondering whether what I has learned from tracing code is true or false? I also found some possibility of optimization in block/vpc.c. Should I contact mentor assigned to this project in private or post the whole idea on the mailing list??
thanks very much Mitnick 2011/3/30 Stefan Hajnoczi <stefa...@gmail.com> > On Wed, Mar 30, 2011 at 5:50 AM, Stefan Weil <w...@mail.berlios.de> wrote: > > Am 29.03.2011 23:55, schrieb Lyu Mitnick: > >> > >> Hello all, > >> > >> I have used QEMU to assist me developing embedded system for 3 years. > And > >> I > >> want to contribute to QEMU and participate Google Summer of Code this > >> year. > >> I have port binutils so I have some experienced with binary format. I > >> noticed that there is no VHD support in qemu-img. A Virtual Hard > Disk(VHD) > >> is a virtual hard disk file format used in Microsoft virtual PC, > Hyper-V, > >> virtual box, xVM and Complete PC Backup of vista and windows 7. I want > to > >> add support for VHD in GSoC. I am wondering whether this kind of idea is > >> valuable to QEMU?? Or any another topic related image format is valuable > >> to > >> QEMU?? > >> > >> thanks > >> > >> Mitnick > > > > Hello Mitnick, > > > > QEMU (including qemu-img) already supports the format vpc. > > The code in block/vpc.c also uses the name vhd, so I think > > vpc == vhd. > > However, it is possible that vpc/vhd has new features that are not yet > supported in QEMU. There is a listed project idea for updating image > formats on the GSoC wiki page: > > > http://wiki.qemu.org/Google_Summer_of_Code_2011#Improved_image_format_compatibility > > You could assess QEMU's implementation in block/vpc.c and compare > against the latest public file format specification: > > http://en.wikipedia.org/wiki/VHD_(file_format) > > If you find there are new features or format changes that are not yet > supported in QEMU, this might make a good "Improved image format > compatibility" GSoC project. > > Stefan >
