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>

diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index a4ac369..a9fe859 100644 (file)
--- 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)