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 > > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos >-- Thanks & Regards, Venkateswara Rao Dokku.
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 at gmail.com> 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 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 > > > > _______________________________________________ > > CentOS mailing list > > CentOS at centos.org > > http://lists.centos.org/mailman/listinfo/centos > > > > > > -- > Thanks & Regards, > Venkateswara Rao Dokku. > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos >
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 at gmail.com> 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 at gmail.com> > 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 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 > > > > > > _______________________________________________ > > > CentOS mailing list > > > CentOS at centos.org > > > http://lists.centos.org/mailman/listinfo/centos > > > > > > > > > > > -- > > Thanks & Regards, > > Venkateswara Rao Dokku. > > _______________________________________________ > > CentOS mailing list > > CentOS at centos.org > > http://lists.centos.org/mailman/listinfo/centos > > > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos >-- Thanks & Regards, Venkateswara Rao Dokku.