xen/gndev: use UOFF_TO_IDX instead of OFF_TO_IDX

The Xen grant table device treats the mmap offset parameter as an unsigned
type, and as so it must use the newly introduced UOFF_TO_IDX.

Sponsored b

xen/gndev: use UOFF_TO_IDX instead of OFF_TO_IDX

The Xen grant table device treats the mmap offset parameter as an unsigned
type, and as so it must use the newly introduced UOFF_TO_IDX.

Sponsored by: Citrix Systems R&D
MFC after: 2 weeks
X-MFC-with: r313690

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Merge ^/head r307736 through r308146.

xen: add a grant-table user-space device

A grant-table user-space device will allow user-space applications to map
and share grants (Xen way to share memory) among Xen domains. This grant
table user

xen: add a grant-table user-space device

A grant-table user-space device will allow user-space applications to map
and share grants (Xen way to share memory) among Xen domains. This grant
table user-space device has been tested with the QEMU Qdisk Xen backed.

Submitted by: jaggi
Reviewed by: royger
Differential review: https://reviews.freebsd.org/D7293

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