[Xen-devel] How to initialize the grant table in a HVM guest OS and its bios

[Bei Guan <gbtju85@xxxxxxxxx>]

Hi,

In Mini-OS, the initialization of the grant table maps the grant table entries into an area called demand_map_area. The code is in the file mini-os/gnttab.c and it's like this 

gnttab_table = map_frames(frames, NR_GRANT_FRAMES);

It seems that getting the demand_map_area needs the infomation from the start_info page in Mini-OS (refer to the method allocate_ondemand int mini-os/arch/x86/mm.c). However, there is no start_info page in a HVM guest OS (maybe it's also true for its virtual bios, such as seabios and uefi bios). So, how to map the grant table entries in a HVM guest OS and its bios?

Any suggestions is appreciated.

Best Regards,

Bei Guan

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