[PATCH] tools/xenstore: set maximum number of grants needed

[Juergen Gross <jgross@xxxxxxxx>]

When running as a stubdom Xenstore should set the maximum number of
grants needed via a call of xengnttab_set_max_grants(), as otherwise
the number of domains which can be supported will be 128 only (the
default number of grants supported by Mini-OS).

Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
---
This is a backport candidate IMO.
---
 tools/xenstore/xenstored_domain.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/xenstore/xenstored_domain.c 
b/tools/xenstore/xenstored_domain.c
index 06359503f0..f740aa02f5 100644
--- a/tools/xenstore/xenstored_domain.c
+++ b/tools/xenstore/xenstored_domain.c
@@ -630,6 +630,8 @@ void domain_init(void)
        *xgt_handle = xengnttab_open(NULL, 0);
        if (*xgt_handle == NULL)
                barf_perror("Failed to open connection to gnttab");
+       /* Allow max number of domains for mappings. */
+       xengnttab_set_max_grants(*xgt_handle, DOMID_FIRST_RESERVED);
 
        talloc_set_destructor(xgt_handle, close_xgt_handle);
 
-- 
2.26.2