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Commit c9ce42f7 authored by Igor Mammedov's avatar Igor Mammedov Committed by Michael S. Tsirkin
Browse files

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: default avatarIgor Mammedov <imammedo@redhat.com>
Signed-off-by: default avatarMichael S. Tsirkin <mst@redhat.com>
parent 4de7255f

drivers/vhost/vhost.c

+6 −2
Original line number Diff line number Diff line
@@ -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)