[CentOS] Converting HVM to PV kernel CentOS7

[Venkateswara Rao Dokku]

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 at hogranch.com> 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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-- 
Thanks & Regards,
Venkateswara Rao Dokku.