From: Juergen Gross <jgross@suse.com>
Date: Thu, 28 Sep 2017 09:06:57 +0000 (+0200)
Subject: tools: set grant limits for xenstore stubdom
X-Git-Tag: 4.10.0-rc1~235
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=4146a43e652b0177c55bf6dedc983f5006e3960a;p=people%2Fdariof%2Fxen.git

tools: set grant limits for xenstore stubdom

When creating a Xenstore stubdom set the grant limits: the stubdom
will need to setup a very limited amount of grants only, so 4 grant
frames are enough. For being able to support up to 32768 domains it
will need 128 maptrack frames (1 mapping per domain, 256 maptrack
entries per maptrack frame).

Signed-off-by: Juergen Gross <jgross@suse.com>
Acked-by: Wei Liu <wei.liu2@citrix.com>
---

diff --git a/tools/helpers/init-xenstore-domain.c b/tools/helpers/init-xenstore-domain.c
index 8a41ee7d3a..047ad0cb1d 100644
--- a/tools/helpers/init-xenstore-domain.c
+++ b/tools/helpers/init-xenstore-domain.c
@@ -105,6 +105,17 @@ static int build(xc_interface *xch)
         fprintf(stderr, "xc_domain_setmaxmem failed\n");
         goto err;
     }
+    /*
+     * 1 grant frame is enough: we don't need many grants.
+     * Mini-OS doesn't like less than 4, though, so use 4.
+     * 128 maptrack frames: 256 entries per frame, enough for 32768 domains.
+     */
+    rv = xc_domain_set_gnttab_limits(xch, domid, 4, 128);
+    if ( rv )
+    {
+        fprintf(stderr, "xc_domain_set_gnttab_limits failed\n");
+        goto err;
+    }
     rv = xc_domain_set_memmap_limit(xch, domid, limit_kb);
     if ( rv )
     {