Re: [CentOS] Converting HVM to PV kernel CentOS7
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@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 pie...@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@centos.org http://lists.centos.org/mailman/listinfo/centos -- Thanks Regards, Venkateswara Rao Dokku. ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Converting HVM to PV kernel CentOS7
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 pie...@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@centos.org http://lists.centos.org/mailman/listinfo/centos -- Thanks Regards, Venkateswara Rao Dokku. ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Converting HVM to PV kernel CentOS7
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.hol...@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@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 pie...@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@centos.org http://lists.centos.org/mailman/listinfo/centos -- Thanks Regards, Venkateswara Rao Dokku. ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos -- Thanks Regards, Venkateswara Rao Dokku. ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
[CentOS] Converting HVM to PV kernel CentOS7
Hi, I have installed CentOS 7 HVM kernel. I would like to convert it to CentOs 7 PV kernel. When googled about it, I found that this can be done by following commands yum install xen or yum install kernel-xen But, when I tried the below commands, I am getting the error *No package kernel-xen available.*** What am I missing here. Any help is much appreciated. -- Thanks Regards, Venkateswara Rao Dokku. ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Converting HVM to PV kernel CentOS7
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@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Converting HVM to PV kernel CentOS7
On 8/18/2015 9:53 PM, Venkateswara Rao Dokku wrote: I have installed CentOS 7 HVM kernel. I would like to convert it to CentOs 7 PV kernel. When googled about it, I found that this can be done by following commands yum install xen or yum install kernel-xen But, when I tried the below commands, I am getting the error *No package kernel-xen available.*** what version were those instructions for ? AFAIK, there's no xen specific kernel in EL7, Red Hat and therefore CentOS supports KVM as their native virtualization, and the PV drivers for KVM are built in. -- john r pierce, recycling bits in santa cruz ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Converting HVM to PV kernel CentOS7
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 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? On Wed, Aug 19, 2015 at 10:43 AM, John R Pierce pie...@hogranch.com wrote: On 8/18/2015 9:53 PM, Venkateswara Rao Dokku wrote: I have installed CentOS 7 HVM kernel. I would like to convert it to CentOs 7 PV kernel. When googled about it, I found that this can be done by following commands yum install xen or yum install kernel-xen But, when I tried the below commands, I am getting the error *No package kernel-xen available.*** what version were those instructions for ? AFAIK, there's no xen specific kernel in EL7, Red Hat and therefore CentOS supports KVM as their native virtualization, and the PV drivers for KVM are built in. -- john r pierce, recycling bits in santa cruz ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos -- Thanks Regards, Venkateswara Rao Dokku. ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
