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+id = 1645
+title = "qemu error `hotplug memory\" error=\"QMP command failed: a used vhost backend has no free memory slots left\"`"
+state = "opened"
+created_at = "2023-05-11T09:43:25.568Z"
+closed_at = "n/a"
+labels = []
+url = "https://gitlab.com/qemu-project/qemu/-/issues/1645"
+host-os = "CentOS Linux release 7.9.2009 (Core)"
+host-arch = "x86"
+qemu-version = "QEMU emulator version 6.1.0 (kata-static)"
+guest-os = "CentOS Linux release 7.9.2009 (Core)"
+guest-arch = "x86"
+description = """When I create a Qemu VM with 8 Gpus and hot-plugging memory, this will return the error QMP command failed: a used vhost backend has no free memory slots left. I read some source file https://gitlab.com/qemu-project/qemu/-/blob/master/hw/virtio/vhost-user.c#L2077, and debug show u->user->memory_slots is 32, but this https://gitlab.com/qemu-project/qemu/-/blob/master/hw/virtio/vhost.c#L62 used_memslots is bigger than u->user->memory_slots. `u->user->memory_slots` is defined 32 by https://gitlab.com/qemu-project/qemu/-/blob/master/subprojects/libvhost-user/libvhost-user.h#L37, but I also see VHOST_USER_MAX_RAM_SLOTS defined 512 under x86 architecture. Can I improve `u->user->memory_slots` by any way?"""
+reproduce = """1.crate kata containers with 8 Gpus
+2.kata containers return error"""
+additional = """"""