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.
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