From: Igor Mammedov <imammedo@redhat.com>
To: linux-kernel@vger.kernel.org
Cc: mst@redhat.com, pbonzini@redhat.com, kvm@vger.kernel.org
Subject: [PATCH 2/2] vhost: increase default limit of nregions from 64 to 509
Date: Wed, 29 Jul 2015 16:29:23 +0200
Message-Id: <1438180163-275465-3-git-send-email-imammedo@redhat.com>
In-Reply-To: <1438180163-275465-1-git-send-email-imammedo@redhat.com>
References: <1438180163-275465-1-git-send-email-imammedo@redhat.com>
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 1403
Lines: 39

although now there is vhost module max_mem_regions option
to set custom limit it doesn't help for default setups,
since it requires administrator manually set a higher
limit on each host. Which complicates servers deployments
and management.
Rise limit to the same value as KVM has (509 slots max),
so that default deployments would work out of box.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
---
PS:
Users that would want to lock down vhost could still
use max_mem_regions option to set lower limit, but
I expect it would be minority.
---
 include/uapi/linux/vhost.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/uapi/linux/vhost.h b/include/uapi/linux/vhost.h
index 2511954..92657bf 100644
--- a/include/uapi/linux/vhost.h
+++ b/include/uapi/linux/vhost.h
@@ -140,7 +140,7 @@ struct vhost_memory {
 #define VHOST_MEM_MAX_NREGIONS_NONE 0
 /* We support at least as many nregions in VHOST_SET_MEM_TABLE:
  * for use on legacy kernels without VHOST_GET_MEM_MAX_NREGIONS support. */
-#define VHOST_MEM_MAX_NREGIONS_DEFAULT 64
+#define VHOST_MEM_MAX_NREGIONS_DEFAULT 509
 
 /* VHOST_NET specific defines */
 
-- 
1.8.3.1

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