Hi Xlord, Yes, the CPU has support for EPT. I wrongly thought that the nested EPT was first introduced in 3.12. Following your instructions I see that I have it enabled on my system as well. However, checking the kernel commits from 3.12 on search string 'nested ept' I found about 10 code changes/fixes for nested EPT. https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/log/?id=refs%2Ftags%2Fv3.12.62&qt=grep&q=Nested+ept What options do I have to get this commits on a Centos 7 kernel? Thank you, Laurentii On Thu, Aug 4, 2016, 12:14 -=X.L.O.R.D=- <xlord.sl at gmail.com> wrote: > Dear Laurentiu, > > Could you please check if your CPU supported from /proc/cpuinfo and lscpu ? > > > > EPT supported > > Xlord > > > > *From:* -=X.L.O.R.D=- [mailto:xlord.sl at gmail.com] > *Sent:* Thursday, August 4, 2016 5:12 PM > *To:* 'Laurentiu Soica' <laurentiu at soica.ro>; 'Discussion about the > virtualization on CentOS' <centos-virt at centos.org> > *Subject:* RE: [CentOS-virt] Centos 7 newer kernel needed > > > > Dear Laurentiu, > > Assume your hardware does support Intel VT-x with EPT supported, I have > also look into the kernel part for fun! > > Just quick look at CentOS 7 and installed a CentOS_7x_x64_build1511 > @installation at minimum, below is my sharing and hope to help! > > 1) CentOS Linux Kernel version: 3.10.0-327.e17.x86_64 SMP > > 2) Kernel parameters which should be your requirement; > > a. Default “kvm-intel.ept=1” (refer to Kernel Archive “ > https://www.kernel.org/”) > > b. > > Xlord > > > > *From:* Laurentiu Soica [mailto:laurentiu at soica.ro <laurentiu at soica.ro>] > > *Sent:* Thursday, August 4, 2016 2:41 PM > *To:* -=X.L.O.R.D=- <xlord.sl at gmail.com>; Discussion about the > virtualization on CentOS <centos-virt at centos.org> > > *Subject:* Re: [CentOS-virt] Centos 7 newer kernel needed > > > > Hello Xlord, > > > > The CPU does have VT support and I already have the nested KVM enabled. > > > > Checking the Linux Kernel release notes I saw that the nested kvm feature > was implemented in 3.10 but he EPT support is in 3.12. > > > > So Centos 7's kernel which is 3.10 does have the EPT support? Is there a > way to check that the EPT support is available in the kernel? > > > > Thank you, > > Laurentiu > > On Thu, Aug 4, 2016, 06:04 -=X.L.O.R.D=- <xlord.sl at gmail.com> wrote: > > Dear Laurentiu, > > Please check below info since assume your CentOS7 box CPU processor > already VT supported in advance. > > 1) Checkpoint #1: Hardware and Kernel modules > > a. cat /proc/cpuinfo | grep vmx > > b. cat /sys/module/kvm_intel/parameters/nested (if “N” then go to checkpoint #2) > > 2) Checkpoint #2: Assume your CentOS box support > > *a.* *echo 'options kvm-intel nested=y' >> /etc/modprobe.d/*dist.conf > > b. modprobe kvm-intel > > 3) Checkpoint #3: Verification > > a. Reboot yout CentOS box > > b. cat /sys/module/kvm_intel/parameters/nested (if “Y” then you can carry one process the KVM installation. > > > > PS: Source: https://lalatendu.org/2015/11/01/kvm-nested-virtualization-in-fedora-23/ which should be very similar with CentOS and CentOS 7 already capable with on with KVM Nested EPT with CPU pass-through options supported. Hope that helps & cheers!! > > Xlord > > > > *From:* centos-virt-bounces at centos.org [mailto: > centos-virt-bounces at centos.org] *On Behalf Of *Laurentiu Soica > *Sent:* Thursday, August 4, 2016 3:07 AM > *To:* centos-virt at centos.org > *Subject:* [CentOS-virt] Centos 7 newer kernel needed > > > > Hello, > > I am looking for a Linux kernel for Centos 7 that implements a feature > introduced in kernel version 3.12: > > "nested EPT support to KVM's nested VMX." > > If anyone has used this feature with Centos 7, please let me know. > > Laurentiu > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.centos.org/pipermail/centos-virt/attachments/20160804/4d07f4eb/attachment-0006.html> -------------- next part -------------- A non-text attachment was scrubbed... Name: image001.png Type: image/png Size: 4726 bytes Desc: not available URL: <http://lists.centos.org/pipermail/centos-virt/attachments/20160804/4d07f4eb/attachment-0006.png>
