support for very large 64-bit bars

[thomasbarrett]

libvfio-user does not appear to support 64-bit BAR. In the 'private.h' file, I noticed that the region size was constrained to uint32_t. Even after fixing this, I can't seem to be able to create a 64-bit BAR. Does anyone have any experience using libvfio-user with 64-bit BARs?

[tmakatos]

We haven't come across 64-bit BARs so far. FWIU, it's should be just a matter of changing uint32_t to uint64_t in a few places. When you say it doesn't work, what do you mean? Do you have some logs/code to share?

[ramakristipati]

is this fixed?

[jlevon]

No, but we would definitely be interested in patches if you're interested in making this work

[jlevon]

@thomasbarrett @ramakristipati can you please try out #792 ?

[jlevon]

Basic 64-bit support done via #792
What remains is support for individual bars over 4g