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xen: switch gnttab_end_foreign_access() to take a struct page pointer

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Instead of a virtual kernel address use a pointer of the associated
struct page as second parameter of gnttab_end_foreign_access().

Most users have that pointer available already and are creating the
virtual address from it, risking problems in case the memory is
located in highmem.

gnttab_end_foreign_access() itself won't need to get the struct page
from the address again.

Suggested-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
This commit is contained in:
Juergen Gross
2022-05-24 13:46:30 +02:00
parent 5b3353949e
commit 49f8b459fc
11 changed files with 28 additions and 32 deletions
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6
include/xen/grant_table.h
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@@ -101,10 +101,10 @@ int gnttab_end_foreign_access_ref(grant_ref_t ref);
* Eventually end access through the given grant reference, and once that
* access has been ended, free the given page too. Access will be ended
* immediately iff the grant entry is not in use, otherwise it will happen
* some time later. page may be 0, in which case no freeing will occur.
* some time later. page may be NULL, in which case no freeing will occur.
* Note that the granted page might still be accessed (read or write) by the
* other side after gnttab_end_foreign_access() returns, so even if page was
* specified as 0 it is not allowed to just reuse the page for other
* specified as NULL it is not allowed to just reuse the page for other
* purposes immediately. gnttab_end_foreign_access() will take an additional
* reference to the granted page in this case, which is dropped only after
* the grant is no longer in use.
@@ -112,7 +112,7 @@ int gnttab_end_foreign_access_ref(grant_ref_t ref);
* gnttab_end_foreign_access() are done via alloc_pages_exact() (and freeing
* via free_pages_exact()) in order to avoid high order pages.
*/
void gnttab_end_foreign_access(grant_ref_t ref, unsigned long page);
void gnttab_end_foreign_access(grant_ref_t ref, struct page *page);
/*
* End access through the given grant reference, iff the grant entry is