[Xen-users] Could not allocate memory for HVM guest

[Mao H <hellomao@xxxxxxxxxxx>]

Hi,

I encountered a problem in creating a dom0 vm. When I set maxmem in the
cfg file, I'll get this error

    xc: error: Could not allocate memory for HVM guest. (16 = Device or
resource busy): Internal error

If I don't have maxmem, it's ok.

Here is my environment and my configuration

dom0 is Gentoo. The kernel is 4.4.26.
I've set
    GRUB_CMDLINE_XEN_DEFAULT="dom0_mem=4096M,max:16384M"
    GRUB_CMDLINE_LINUX_XEN_REPLACE_DEFAULT="softlevel=xen"
in /etc/default/grub and
    autoballoon="0"
in /etc/xen/xl.conf

"xl info" shows that there's around 12G free memory
machine                : x86_64
nr_cpus                : 4
max_cpu_id             : 3
nr_nodes               : 1
cores_per_socket       : 4
threads_per_core       : 1
cpu_mhz                : 3116
hw_caps                :
bfebfbff:28100800:00000000:00007f00:77bae3bf:00000000:00000001:00000281
virt_caps              : hvm hvm_directio
total_memory           : 16332
free_memory            : 12018
sharing_freed_memory   : 0
sharing_used_memory    : 0
outstanding_claims     : 0
free_cpus              : 0
xen_major              : 4
xen_minor              : 6
xen_extra              : .3
xen_version            : 4.6.3
xen_caps               : xen-3.0-x86_64 xen-3.0-x86_32p hvm-3.0-x86_32
hvm-3.0-x86_32p hvm-3.0-x86_64
xen_scheduler          : credit
xen_pagesize           : 4096
platform_params        : virt_start=0xffff800000000000
xen_changeset          :
xen_commandline        : placeholder dom0_mem=4096M,max:16384M
cc_compiler            : x86_64-pc-linux-gnu-gcc (Gentoo 4.9.3 p1.5,
pie-0.6.4) 4.9.3
cc_compile_by          :
cc_compile_domain      : Home
cc_compile_date        : Fri Nov  4 09:56:34 PDT 2016
xend_config_format     : 4


And here's my vm configuration

name = "xenwin10"
builder='hvm'
memory = 4096
maxmem = 6144
shadow_memory = 8
vif = [ 'type=ioemu, bridge=xenbr0' ]
acpi = 1
apic = 1
disk = [ 'phy:/dev/sdb,hda,w' ]
hdtype="ahci"
boot="c"
sdl=0
vnc=1
vncconsole=1
vncpasswd=''

serial='pty'
usbdevice='tablet'


If I don't set maxmem, there is no the memory error (though there're
other errors such as network bridge. But I don't think it's related here).

My question is: Why can I set the memory with maxmem and how do I solve
the memory issue and also have maxmem set.I would like to set 4G to the
Windows VM to start with and allow it to grow to 6G.

Please advise me any solutions or investigation. I appreciate it.

Thanks so much
Mao
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