On 30.09.20 17:14, Wei Liu wrote:
On Thu, Sep 24, 2020 at 04:36:48PM +0200, Juergen Gross wrote:
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 <jgr...@suse.com>
---
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);
Why DOMID_FIRST_RESERVED as the count argument? Is the expectation here
xenstored maps one grant per domain?
Yes. This is the theoretical maximum.
Juergen
