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xen: re-introduce support for grant v2 interface

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The grant v2 support was removed from the kernel with
commit 438b33c714 ("xen/grant-table:
remove support for V2 tables") as the higher memory footprint of v2
grants resulted in less grants being possible for a kernel compared
to the v1 grant interface.

As machines with more than 16TB of memory are expected to be more
common in the near future support of grant v2 is mandatory in order
to be able to run a Xen pv domain at any memory location.

So re-add grant v2 support basically by reverting above commit.

Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
This commit is contained in:
Juergen Gross
2017-11-02 10:19:17 +01:00
committed by Boris Ostrovsky
parent ec4001c3f2
commit b988b8ff07
4 changed files with 399 additions and 14 deletions
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9
arch/arm/xen/grant-table.c
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@@ -45,7 +45,14 @@ void arch_gnttab_unmap(void *shared, unsigned long nr_gframes)
return;
}
int arch_gnttab_init(unsigned long nr_shared)
int arch_gnttab_map_status(uint64_t *frames, unsigned long nr_gframes,
unsigned long max_nr_gframes,
grant_status_t **__shared)
{
return -ENOSYS;
}
int arch_gnttab_init(unsigned long nr_shared, unsigned long nr_status)
{
return 0;
}