since commit
 1d4e7e3 kvm: x86: increase user memory slots to 509

it became possible to use a bigger amount of memory
slots, which is used by memory hotplug for
registering hotplugged memory.
However QEMU aborts if it's used with more than ~60
pc-dimm devices and vhost-net since host kernel
in module vhost-net refuses to accept more than 65
memory regions.

Increasing VHOST_MEMORY_MAX_NREGIONS from 65 to 509
to match KVM_USER_MEM_SLOTS fixes issue for vhost-net.

Signed-off-by: Igor Mammedov <redacted>
---
 drivers/vhost/vhost.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index 2ee2826..ecbd7a4 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c

@@ -29,7 +29,7 @@
 #include "vhost.h"
 
 enum {
-	VHOST_MEMORY_MAX_NREGIONS = 64,
+	VHOST_MEMORY_MAX_NREGIONS = 509,
 	VHOST_MEMORY_F_LOG = 0x1,
 };
 

-- 
1.8.3.1