I have taken the latest CentOS 7 base image, and after the installation &
customization I came to know that it is HVM.
So, I wanted to know before hand itself whether its HVM or PV. How can I do
it?
are there any specific steps we need to follow?
On Wed, Aug 19, 2015 at 11:57 AM, Andrew Holway <andrew.holway@xxxxxxxxx>
wrote:
> All modern kernels are PV compatible. You can take the same Linux image and
> run it HVM or PV.
>
>
>
> On 19 August 2015 at 09:19, Venkateswara Rao Dokku <dvrao.584@xxxxxxxxx>
> wrote:
>
> > Thanks for the reply.
> >
> > If we want to have PV kernel for CentOs 7 , are there any guidelines to
> > follow?
> > How we can know before hand itself that this kernel is PV or HVM, without
> > installing kernel?
> >
> > On Wed, Aug 19, 2015 at 11:27 AM, John R Pierce <pierce@xxxxxxxxxxxx>
> > wrote:
> >
> > > On 8/18/2015 10:37 PM, Venkateswara Rao Dokku wrote:
> > >
> > >> Thanks for the reply.
> > >> Sorry for the typo in the earlier mail.
> > >> I have PV-HVM of CentOS 7 & I need to convert it to PV kernel.
> > >>
> > >> Basically here I am trying to see whether my PV_HVM kernel is
> vulenrable
> > >> to
> > >> this issue given in the following link
> > >> http://seclists.org/oss-sec/2015/q3/212
> > >>
> > >
> > >
> > > that is talking about a problem with QEMU and emulated cdroms, and as
> far
> > > as I can tell, the bug is in the qemu emulator, not in the VM's. it
> > > merely states that if you only use PV VM's you won't trigger the bug,
> but
> > > the correct fix is to update your QEMU so there is no bug.
> > >
> > >
> > > In the above link, it was mentioned that the PV kernel is not
> vulnerable
> > to
> > >> this bug, but HVM is. It didnt say anything about PV-HVM.
> > >>
> > >> Can you please help me in this regard?
> > >>
> > >
> > > https://access.redhat.com/security/cve/CVE-2015-5154 suggests QEMU
> has
> > > been fixed as of July 27/28, at least for KVM servers, see the 4 RHSA
> > > Errata linked there.
> > >
> > > again, RHEL7 and therefore CentOS 7 is all about KVM not Xen.
> > >
> > > If you're running someone's xen server, you need to ensure its patched
> > > against this bug.
> > >
> > >
> > > --
> > > john r pierce, recycling bits in santa cruz
> > >
> > > _______________________________________________
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> > > CentOS@xxxxxxxxxx
> > > http://lists.centos.org/mailman/listinfo/centos
> > >
> >
> >
> >
> > --
> > Thanks & Regards,
> > Venkateswara Rao Dokku.
> > _______________________________________________
> > CentOS mailing list
> > CentOS@xxxxxxxxxx
> > http://lists.centos.org/mailman/listinfo/centos
> >
> _______________________________________________
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>
--
Thanks & Regards,
Venkateswara Rao Dokku.
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