From: James Okken <James.Okken@dialogic.com>
To: "kvm@vger.kernel.org" <kvm@vger.kernel.org>,
"kvm-owner@vger.kernel.org" <kvm-owner@vger.kernel.org>
Subject: RE: CentOS 7.2 HVM, PVM and/or PVHVM
Date: Fri, 31 Mar 2017 21:20:01 +0000 [thread overview]
Message-ID: <MWHPR0101MB3072B3F86F4A27EF13E11FF58D370@MWHPR0101MB3072.prod.exchangelabs.com> (raw)
In-Reply-To: <90670d4a-2c68-0050-157a-2dba290bc41a@redhat.com>
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_balloon virtio_console
virtio 15008 5 virtio_blk,virtio_net,virtio_pci,virtio_balloon 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 Bonzini
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!
>
>>>>>>>
> hi all,
>
> I have this nagging question I'm hoping someone could clear up for me. There 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 using.
>
> 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 show the VMs are PVMs.
>
> But when I look at the XML of the VMs I see: <type arch='x86_64' machine='pc-i440fx-rhel7.0.0'>hvm</type>
>
> Does that <type>hvm</type> mean I am mistaken?
>
> Thanks
> <<<<<<
>
next prev parent reply other threads:[~2017-03-31 21:20 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-03-30 15:44 CentOS 7.2 HVM, PVM and/or PVHVM James Okken
2017-03-31 11:13 ` Paolo Bonzini
2017-03-31 21:20 ` James Okken [this message]
2017-04-02 19:39 ` Paolo Bonzini
2017-04-03 15:36 ` James Okken
2017-04-03 16:59 ` Paolo Bonzini
2017-04-03 17:22 ` James Okken
2017-04-03 17:26 ` Paolo Bonzini
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