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Subject: Re: [Qemu-arm] [Qemu-devel] Help: Does Qemu support virtio-pci for
 net-device and disk device?
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On Thu, 2016-08-18 at 20:43 +0800, Kevin Zhao wrote:
> What's the minimum version of=C2=A0=C2=A0Qemu that support virito-1.0?
> Does Qemu 2.6 works?=C2=A0

2.6 definitely has virtio 1.0 support, however libvirt does
not yet allow you to control whether a device uses 0.9, 1.0
or both. The default for 2.6 should be both IIRC.

> Now I will manually add the slots and bus to pcie. Because
> I am not familiar with it,=C2=A0=C2=A0if it convenient, could you give
> me an available xml file which PCIE disk and PCIE
> net device can work for machine virt ?

The XML you're looking for is at the end of this message.

Note that a Fedora 24 guest configured this way will not
boot at all if the machine type is virt-2.6; on the other
hand, an identically-configured RHEL 7.3 guest will boot
even with virt-2.6, but both the disk and the network
adapter will be legacy PCI instead of PCIe.


<domain type=3D'kvm'>
=C2=A0 <name>abologna-f24</name>
=C2=A0 <uuid>f6d0428b-a034-4c4e-8ef2-f12f6aa9cab0</uuid>
=C2=A0 <memory unit=3D'KiB'>2097152</memory>
=C2=A0 <currentMemory unit=3D'KiB'>2097152</currentMemory>
=C2=A0 <vcpu placement=3D'static'>4</vcpu>
=C2=A0 <os>
=C2=A0=C2=A0=C2=A0=C2=A0<type arch=3D'aarch64' machine=3D'virt-2.7'>hvm</=
type>
=C2=A0=C2=A0=C2=A0=C2=A0<loader readonly=3D'yes' type=3D'pflash'>/usr/sha=
re/AAVMF/AAVMF_CODE.fd</loader>
=C2=A0=C2=A0=C2=A0=C2=A0<nvram>/var/lib/libvirt/qemu/nvram/abologna-f24_V=
ARS.fd</nvram>
=C2=A0=C2=A0=C2=A0=C2=A0<boot dev=3D'hd'/>
=C2=A0 </os>
=C2=A0 <features>
=C2=A0=C2=A0=C2=A0=C2=A0<gic version=3D'2'/>
=C2=A0 </features>
=C2=A0 <cpu mode=3D'host-passthrough'/>
=C2=A0 <clock offset=3D'utc'/>
=C2=A0 <on_poweroff>destroy</on_poweroff>
=C2=A0 <on_reboot>restart</on_reboot>
=C2=A0 <on_crash>restart</on_crash>
=C2=A0 <devices>
=C2=A0=C2=A0=C2=A0=C2=A0<emulator>/usr/libexec/abologna-qemu-kvm</emulato=
r>
=C2=A0=C2=A0=C2=A0=C2=A0<disk type=3D'file' device=3D'disk'>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0<driver name=3D'qemu' type=3D'qcow2'/=
>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0<source file=3D'/var/lib/libvirt/imag=
es/abologna-f24.qcow2'/>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0<target dev=3D'vda' bus=3D'virtio'/>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0<address type=3D'pci' domain=3D'0x000=
0' bus=3D'0x01' slot=3D'0x00' function=3D'0x0'/>
=C2=A0=C2=A0=C2=A0=C2=A0</disk>
=C2=A0=C2=A0=C2=A0=C2=A0<controller type=3D'pci' index=3D'0' model=3D'pci=
e-root'/>
=C2=A0=C2=A0=C2=A0=C2=A0<controller type=3D'pci' index=3D'1' model=3D'pci=
e-root-port'>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0<model name=3D'ioh3420'/>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0<target chassis=3D'1' port=3D'0x8'/>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0<address type=3D'pci' domain=3D'0x000=
0' bus=3D'0x00' slot=3D'0x01' function=3D'0x0'/>
=C2=A0=C2=A0=C2=A0=C2=A0</controller>
=C2=A0=C2=A0=C2=A0=C2=A0<controller type=3D'pci' index=3D'2' model=3D'pci=
e-root-port'>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0<model name=3D'ioh3420'/>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0<target chassis=3D'2' port=3D'0x10'/>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0<address type=3D'pci' domain=3D'0x000=
0' bus=3D'0x00' slot=3D'0x02' function=3D'0x0'/>
=C2=A0=C2=A0=C2=A0=C2=A0</controller>
=C2=A0=C2=A0=C2=A0=C2=A0<controller type=3D'virtio-serial' index=3D'0'>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0<address type=3D'virtio-mmio'/>
=C2=A0=C2=A0=C2=A0=C2=A0</controller>
=C2=A0=C2=A0=C2=A0=C2=A0<interface type=3D'network'>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0<mac address=3D'52:54:00:10:07:41'/>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0<source network=3D'default'/>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0<model type=3D'virtio'/>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0<rom bar=3D'off'/>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0<address type=3D'pci' domain=3D'0x000=
0' bus=3D'0x02' slot=3D'0x00' function=3D'0x0'/>
=C2=A0=C2=A0=C2=A0=C2=A0</interface>
=C2=A0=C2=A0=C2=A0=C2=A0<serial type=3D'pty'>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0<target port=3D'0'/>
=C2=A0=C2=A0=C2=A0=C2=A0</serial>
=C2=A0=C2=A0=C2=A0=C2=A0<console type=3D'pty'>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0<target type=3D'serial' port=3D'0'/>
=C2=A0=C2=A0=C2=A0=C2=A0</console>
=C2=A0=C2=A0=C2=A0=C2=A0<channel type=3D'unix'>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0<source mode=3D'bind'/>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0<target type=3D'virtio' name=3D'org.q=
emu.guest_agent.0'/>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0<address type=3D'virtio-serial' contr=
oller=3D'0' bus=3D'0' port=3D'1'/>
=C2=A0=C2=A0=C2=A0=C2=A0</channel>
=C2=A0 </devices>
</domain>

--=C2=A0
Andrea Bolognani / Red Hat / Virtualization

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From: Andrea Bolognani <abologna@redhat.com>
Date: Thu, 18 Aug 2016 15:51:52 +0200
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	<20160817161303.jdglwirs522vn2wa@kamzik.localdomain>
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Subject: Re: [Qemu-devel] Help: Does Qemu support virtio-pci for net-device
 and disk device?
List-Id: <qemu-devel.nongnu.org>
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To: Kevin Zhao <kevin.zhao@linaro.org>, Laine Stump <laine@redhat.com>
Cc: QEMU Developers <qemu-devel@nongnu.org>, Andrew Jones <drjones@redhat.com>, qemu-arm <qemu-arm@nongnu.org>, Thomas Hanson <thomas.hanson@linaro.org>, Peter Maydell <peter.maydell@linaro.org>, Gema Gomez-Solano <gema.gomez-solano@linaro.org>, Marcel Apfelbaum <mapfelba@redhat.com>

On Thu, 2016-08-18 at 20:43 +0800, Kevin Zhao wrote:
> What's the minimum version of=C2=A0=C2=A0Qemu that support virito-1.0?
> Does Qemu 2.6 works?=C2=A0

2.6 definitely has virtio 1.0 support, however libvirt does
not yet allow you to control whether a device uses 0.9, 1.0
or both. The default for 2.6 should be both IIRC.

> Now I will manually add the slots and bus to pcie. Because
> I am not familiar with it,=C2=A0=C2=A0if it convenient, could you give
> me an available xml file which PCIE disk and PCIE
> net device can work for machine virt ?

The XML you're looking for is at the end of this message.

Note that a Fedora 24 guest configured this way will not
boot at all if the machine type is virt-2.6; on the other
hand, an identically-configured RHEL 7.3 guest will boot
even with virt-2.6, but both the disk and the network
adapter will be legacy PCI instead of PCIe.


<domain type=3D'kvm'>
=C2=A0 <name>abologna-f24</name>
=C2=A0 <uuid>f6d0428b-a034-4c4e-8ef2-f12f6aa9cab0</uuid>
=C2=A0 <memory unit=3D'KiB'>2097152</memory>
=C2=A0 <currentMemory unit=3D'KiB'>2097152</currentMemory>
=C2=A0 <vcpu placement=3D'static'>4</vcpu>
=C2=A0 <os>
=C2=A0=C2=A0=C2=A0=C2=A0<type arch=3D'aarch64' machine=3D'virt-2.7'>hvm</=
type>
=C2=A0=C2=A0=C2=A0=C2=A0<loader readonly=3D'yes' type=3D'pflash'>/usr/sha=
re/AAVMF/AAVMF_CODE.fd</loader>
=C2=A0=C2=A0=C2=A0=C2=A0<nvram>/var/lib/libvirt/qemu/nvram/abologna-f24_V=
ARS.fd</nvram>
=C2=A0=C2=A0=C2=A0=C2=A0<boot dev=3D'hd'/>
=C2=A0 </os>
=C2=A0 <features>
=C2=A0=C2=A0=C2=A0=C2=A0<gic version=3D'2'/>
=C2=A0 </features>
=C2=A0 <cpu mode=3D'host-passthrough'/>
=C2=A0 <clock offset=3D'utc'/>
=C2=A0 <on_poweroff>destroy</on_poweroff>
=C2=A0 <on_reboot>restart</on_reboot>
=C2=A0 <on_crash>restart</on_crash>
=C2=A0 <devices>
=C2=A0=C2=A0=C2=A0=C2=A0<emulator>/usr/libexec/abologna-qemu-kvm</emulato=
r>
=C2=A0=C2=A0=C2=A0=C2=A0<disk type=3D'file' device=3D'disk'>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0<driver name=3D'qemu' type=3D'qcow2'/=
>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0<source file=3D'/var/lib/libvirt/imag=
es/abologna-f24.qcow2'/>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0<target dev=3D'vda' bus=3D'virtio'/>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0<address type=3D'pci' domain=3D'0x000=
0' bus=3D'0x01' slot=3D'0x00' function=3D'0x0'/>
=C2=A0=C2=A0=C2=A0=C2=A0</disk>
=C2=A0=C2=A0=C2=A0=C2=A0<controller type=3D'pci' index=3D'0' model=3D'pci=
e-root'/>
=C2=A0=C2=A0=C2=A0=C2=A0<controller type=3D'pci' index=3D'1' model=3D'pci=
e-root-port'>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0<model name=3D'ioh3420'/>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0<target chassis=3D'1' port=3D'0x8'/>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0<address type=3D'pci' domain=3D'0x000=
0' bus=3D'0x00' slot=3D'0x01' function=3D'0x0'/>
=C2=A0=C2=A0=C2=A0=C2=A0</controller>
=C2=A0=C2=A0=C2=A0=C2=A0<controller type=3D'pci' index=3D'2' model=3D'pci=
e-root-port'>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0<model name=3D'ioh3420'/>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0<target chassis=3D'2' port=3D'0x10'/>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0<address type=3D'pci' domain=3D'0x000=
0' bus=3D'0x00' slot=3D'0x02' function=3D'0x0'/>
=C2=A0=C2=A0=C2=A0=C2=A0</controller>
=C2=A0=C2=A0=C2=A0=C2=A0<controller type=3D'virtio-serial' index=3D'0'>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0<address type=3D'virtio-mmio'/>
=C2=A0=C2=A0=C2=A0=C2=A0</controller>
=C2=A0=C2=A0=C2=A0=C2=A0<interface type=3D'network'>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0<mac address=3D'52:54:00:10:07:41'/>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0<source network=3D'default'/>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0<model type=3D'virtio'/>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0<rom bar=3D'off'/>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0<address type=3D'pci' domain=3D'0x000=
0' bus=3D'0x02' slot=3D'0x00' function=3D'0x0'/>
=C2=A0=C2=A0=C2=A0=C2=A0</interface>
=C2=A0=C2=A0=C2=A0=C2=A0<serial type=3D'pty'>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0<target port=3D'0'/>
=C2=A0=C2=A0=C2=A0=C2=A0</serial>
=C2=A0=C2=A0=C2=A0=C2=A0<console type=3D'pty'>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0<target type=3D'serial' port=3D'0'/>
=C2=A0=C2=A0=C2=A0=C2=A0</console>
=C2=A0=C2=A0=C2=A0=C2=A0<channel type=3D'unix'>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0<source mode=3D'bind'/>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0<target type=3D'virtio' name=3D'org.q=
emu.guest_agent.0'/>
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0<address type=3D'virtio-serial' contr=
oller=3D'0' bus=3D'0' port=3D'1'/>
=C2=A0=C2=A0=C2=A0=C2=A0</channel>
=C2=A0 </devices>
</domain>

--=C2=A0
Andrea Bolognani / Red Hat / Virtualization