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List:       xen-users
Subject:    Re: [Xen-users] pvhvm domU via direct kernel boot on multi-cpu systems only shows one vcpu
From:       Tomas Mozes <hydrapolic () gmail ! com>
Date:       2017-06-29 12:30:44
Message-ID: CAG6MAzSafrpiGLsHk_1WnORPaXioh8pm17=g1NhGY21HkAtp2g () mail ! gmail ! com
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On Fri, Jun 9, 2017 at 5:54 PM, Tomas Mozes <hydrapolic@gmail.com> 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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<div dir="ltr"><br><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Jun \
9, 2017 at 5:54 PM, Tomas Mozes <span dir="ltr">&lt;<a \
href="mailto:hydrapolic@gmail.com" \
target="_blank">hydrapolic@gmail.com</a>&gt;</span> wrote:<br><blockquote \
class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc \
solid;padding-left:1ex"><div dir="ltr">Hello,<br>we&#39;re trying to migrate PV domUs \
to PVHVM. It seems that it works just <br>fine for single CPU servers, but servers \
having two physical processors <br>only provide 1 virtual cpu in the domU when using \
direct kernel boot. <br>When running a HVM machine without direct kernel boot, it \
properly <br>detects all cores.<br><br>PV<br>kernel = \
&quot;kernel-4.4.67-gentoo-xen&quot;<br>extra = &quot;root=/dev/xvda1 \
net.ifnames=0&quot;<br>memory = 4000<br>vcpus = 24<br>disk = \
[&#39;/dev/vg_data/hydra_root,raw,<wbr>xvda1,rw&#39;]<br>=&gt; shows 24 \
vcpus<br><br>HVM<br>builder = &quot;hvm&quot;<br>kernel = \
&quot;kernel-4.4.67-gentoo-xen&quot;<br>extra = &quot;root=/dev/xvda net.ifnames=0 \
console=ttyS0 console=ttyS0,38400n8&quot;<br>memory = 4000<br>vcpus = 24<br>disk = \
[&#39;/dev/vg_data/hydra_root,raw,<wbr>xvda,rw&#39;]<br>sdl = 0<br>vnc = \
0<br>serial=&#39;pty&#39;<br>xen_platform_pci=1<br>=&gt; shows only 1 vcpu on a \
machine with 2 physical CPU<br><br>Tested with kernel 4.4.67, xen \
4.8.1.<br><br>Thanks,<br>Tomas<br></div></blockquote><div><br><br></div><div>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.<br></div><div><br></div><div></div><div>Tomas <br></div></div><br></div></div>


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