[CentOS-virt] Centos 7 newer kernel needed

Laurentiu Soica
2016-08-04T12:30:12Z

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
>
>
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