Re: [Xen-devel] Regression in Xen 4.7-rc1 - can't boot HVM guests with more than 64 vCPUS.

[Konrad Rzeszutek Wilk <konrad@xxxxxxxxxx>]

On Tue, May 3, 2016 at 12:47 PM, Konrad Rzeszutek Wilk
<konrad.wilk@xxxxxxxxxx> wrote:
>
> The host has 240 CPUs and the HVM guests config looks as follow:
>
> -bash-4.1# cat /hvm.cfg
> memory=64000
> name="big64"
> vcpus = 64
> disk= ['file:/isos/root_image.iso,hdc:cdrom,r']
> builder="hvm"

If I add :
device_model_version = 'qemu-xen-traditional'


> serial='pty'
> usb=1
> vnclisten="0.0.0.0:64"
>
I get this in /var/log/xen/qemu-dm-big64-qemu-trad.log:
-bash-4.1# cat qemu-dm-big64-qemu-trad.log
domid: 15
Strip off blktap sub-type prefix to /isos/root_image.iso (drv 'aio')
Using file /isos/root_image.iso in read-only mode
Watching device-model/15/logdirty/cmd
Watching device-model/15/command
Watching /local/domain/15/cpu
char device redirected to /dev/pts/13
qemu_map_cache_init nr_buckets = 10000 size 4194304
shared page at pfn feffd
buffered io page at pfn feffb
Guest uuid = f46f33b7-8e8d-4b63-b56c-4e01af0448d2
populating video RAM at ff000000
mapping video RAM from ff000000
Register xen platform.
Done register platform.
platform_fixed_ioport: changed ro/rw state of ROM memory area. now is rw state.
xs_read(device-model/15/xen_extended_power_mgmt): read error
xs_read(): vncpasswd get error.
/vm/f46f33b7-8e8d-4b63-b56c-4e01af0448d2/vncpasswd.
medium change watch on `hdc' (index: 0): aio:/isos/root_image.iso
Fatal error while trying to get io event!

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