Re: [Xen-users] pvhvm domU via direct kernel boot on multi-cpu systems only shows one vcpu

[Tomas Mozes <hydrapolic@xxxxxxxxx>]

On Fri, Jun 9, 2017 at 5:54 PM, Tomas Mozes <hydrapolic@xxxxxxxxx> wrote:

Hello,
we're trying to migrate PV domUs to PVHVM. It seems that it works just
fine for single CPU servers, but servers having two physical processors
only provide 1 virtual cpu in the domU when using direct kernel boot.
When running a HVM machine without direct kernel boot, it properly
detects all cores.

PV
kernel = "kernel-4.4.67-gentoo-xen"
extra = "root=/dev/xvda1 net.ifnames=0"
memory = 4000
vcpus = 24
disk = ['/dev/vg_data/hydra_root,raw,xvda1,rw']
=> shows 24 vcpus

HVM
builder = "hvm"
kernel = "kernel-4.4.67-gentoo-xen"
extra = "root=/dev/xvda net.ifnames=0 console=ttyS0 console=ttyS0,38400n8"
memory = 4000
vcpus = 24
disk = ['/dev/vg_data/hydra_root,raw,xvda,rw']
sdl = 0
vnc = 0
serial='pty'
xen_platform_pci=1
=> shows only 1 vcpu on a machine with 2 physical CPU

Tested with kernel 4.4.67, xen 4.8.1.

Thanks,
Tomas

My xen-domU kernel configuration was too minimalistic, seems like it was missing acpi. Now it works properly even with 2x 20 core machines with xen 4.8.1 in pvhvm.

Tomas

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