From 11c7ff17c9b6dbf3a4e4f36be30ad531a6cf0ec9 Mon Sep 17 00:00:00 2001 From: Konrad Rzeszutek Wilk Date: Mon, 6 Jan 2014 10:44:39 -0500 Subject: [PATCH] xen/grant-table: Force to use v1 of grants. We have the framework to use v2, but there are no backends that actually use it. The end result is that on PV we use v2 grants and on PVHVM v1. The v1 has a capacity of 512 grants per page while the v2 has 256 grants per page. This means we lose about 50% capacity - and if we want more than 16 VIFs (each VIF takes 512 grants), then we are hitting the max per guest of 32. Oracle-bug: 16039922 CC: annie.li@oracle.com CC: msw@amazon.com Signed-off-by: Konrad Rzeszutek Wilk Reviewed-by: David Vrabel --- drivers/xen/grant-table.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/drivers/xen/grant-table.c b/drivers/xen/grant-table.c index 1d5fbce..1ce1c403 100644 --- a/drivers/xen/grant-table.c +++ b/drivers/xen/grant-table.c @@ -1184,10 +1184,8 @@ static void gnttab_request_version(void) int rc; struct gnttab_set_version gsv; - if (xen_feature(XENFEAT_auto_translated_physmap)) - gsv.version = 1; - else - gsv.version = 2; + gsv.version = 1; + rc = HYPERVISOR_grant_table_op(GNTTABOP_set_version, &gsv, 1); if (rc == 0 && gsv.version == 2) { grant_table_version = 2; -- 2.7.4