lkml.org 
[lkml]   [2011]   [Dec]   [7]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 1/2] xen/granttable: Support sub-page grants

> +void gnttab_grant_foreign_access_ref_subpage_v2(grant_ref_t ref, domid_t domid,
> + unsigned long frame, int flags,
> + unsigned page_off,
> + unsigned length)
> +{
> + BUG_ON(flags& (GTF_accept_transfer | GTF_reading |
> + GTF_writing | GTF_transitive));
This is slightly changed from the initial code, welcome your suggestions.

Initial condition is:
BUG_ON(flags & (GTF_accept_transfer | GTF_reading | GTF_writing |
GTF_sub_page | GTF_permit_access));

GTF_sub_page | GTF_permit_access will be set later in this function, so
it is necessary to verify this flag here.
GTF_transitive and GTF_sub_page can not be enabled at same time, so
GTF_transitive is checked here to avoid those two flags are both enabled.

Same code was changed in corresponding transitive function.

Thanks
Annie
> + BUG_ON(grant_table_version == 1);
> + gnttab_shared.v2[ref].sub_page.frame = frame;
> + gnttab_shared.v2[ref].sub_page.page_off = page_off;
> + gnttab_shared.v2[ref].sub_page.length = length;
> + gnttab_shared.v2[ref].hdr.domid = domid;
> + wmb();
> + gnttab_shared.v2[ref].hdr.flags =
> + GTF_permit_access | GTF_sub_page | flags;
> +}
>


\
 
 \ /
  Last update: 2011-12-07 11:39    [W:2.385 / U:0.008 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site