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authorIgor Mammedov <imammedo@redhat.com>2015-07-02 15:08:11 +0200
committerMichael S. Tsirkin <mst@redhat.com>2015-07-13 23:17:19 +0300
commitc9ce42f72fd0ba180fd35539829e4139dca31494 (patch)
treef92250cbd4a9760cb8b69cd349c5e4ee9033b0e8
parent4de7255f7d2be5e51664c6ac6011ffd6e5463571 (diff)
vhost: add max_mem_regions module parameter
it became possible to use a bigger amount of memory slots, which is used by memory hotplug for registering hotplugged memory. However QEMU crashes if it's used with more than ~60 pc-dimm devices and vhost-net enabled since host kernel in module vhost-net refuses to accept more than 64 memory regions. Allow to tweak limit via max_mem_regions module paramemter with default value set to 64 slots. Signed-off-by: Igor Mammedov <imammedo@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
-rw-r--r--drivers/vhost/vhost.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index a4ac369f6adb..a9fe859f43c8 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -30,8 +30,12 @@
#include "vhost.h"
+static ushort max_mem_regions = 64;
+module_param(max_mem_regions, ushort, 0444);
+MODULE_PARM_DESC(max_mem_regions,
+ "Maximum number of memory regions in memory map. (default: 64)");
+
enum {
- VHOST_MEMORY_MAX_NREGIONS = 64,
VHOST_MEMORY_F_LOG = 0x1,
};
@@ -697,7 +701,7 @@ static long vhost_set_memory(struct vhost_dev *d, struct vhost_memory __user *m)
return -EFAULT;
if (mem.padding)
return -EOPNOTSUPP;
- if (mem.nregions > VHOST_MEMORY_MAX_NREGIONS)
+ if (mem.nregions > max_mem_regions)
return -E2BIG;
newmem = vhost_kvzalloc(size + mem.nregions * sizeof(*m->regions));
if (!newmem)