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vhost: add max_mem_regions module parameter

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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>
This commit is contained in:
Igor Mammedov 2015-07-02 15:08:11 +02:00 committed by Michael S. Tsirkin
parent 4de7255f7d
commit c9ce42f72f
1 changed files with 6 additions and 2 deletions
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8
drivers/vhost/vhost.c
View File

@ -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)