From mboxrd@z Thu Jan  1 00:00:00 1970
From: James Okken <James.Okken@dialogic.com>
Subject: RE: CentOS 7.2 HVM, PVM and/or PVHVM
Date: Fri, 31 Mar 2017 21:20:01 +0000
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 <90670d4a-2c68-0050-157a-2dba290bc41a@redhat.com>
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Oh wow.!? Is that really the case?
I'm surprised because I see these things in my centos7 KVM VMs (aren't they=
 signs of a PVM or at least a PVHVM?

dmesg | grep -i virtual
[    0.000000] Booting paravirtualized kernel on KVM
[    0.398931] systemd[1]: Detected virtualization 'kvm'.


lsmod | grep virt
virtio_balloon         13664  0
virtio_blk             18156  5
virtio_console         28114  0
virtio_net             28024  0
virtio_pci             22913  0
virtio_ring            21524  5 virtio_blk,virtio_net,virtio_pci,virtio_bal=
loon virtio_console
virtio                 15008  5 virtio_blk,virtio_net,virtio_pci,virtio_bal=
loon virtio_console


lspci | grep -i virt
00:03.0 Ethernet controller: Red Hat, Inc Virtio network device
00:04.0 Communication controller: Red Hat, Inc Virtio console
00:06.0 SCSI storage controller: Red Hat, Inc Virtio block device
00:07.0 Unclassified device [00ff]: Red Hat, Inc Virtio memory balloon
00:09.0 Ethernet controller: Red Hat, Inc Virtio network device

Not to doubt anyone, I am just wanting to understand this fully.,

Thanks

--Jim




-----Original Message-----
From: Paolo Bonzini [mailto:paolo.bonzini@gmail.com] On Behalf Of Paolo Bon=
zini
Sent: Friday, March 31, 2017 7:14 AM
To: James Okken; kvm@vger.kernel.org; kvm-owner@vger.kernel.org
Subject: Re: CentOS 7.2 HVM, PVM and/or PVHVM



On 30/03/2017 17:44, James Okken wrote:
> Sorry I just hijacked that thread, I meant to change the subject before I=
 sent!
>=20
>>>>>>>
> hi all,
>=20
> I have this nagging question I'm hoping someone could clear up for me. Th=
ere is so much information and discussion out there regarding HVM, PVM and =
PVHVM it is hard to get any concrete understanding of what I'm actually usi=
ng.
>=20
> I thought I understood that my KVM deployment on CentOS 7.2 was creating =
PVM VMs.

KVM only has HVM.  PVM and PVHVM are Xen concepts.

Paolo

> Checking dmesg, lspci, lsmod of the running centos7 VMs all indications s=
how the VMs are PVMs.
>=20
> But when I look at the XML of the VMs I see: <type arch=3D'x86_64' machin=
e=3D'pc-i440fx-rhel7.0.0'>hvm</type>
>=20
> Does that <type>hvm</type> mean I am mistaken?
>=20
> Thanks
> <<<<<<
>=20