[CentOS] CentOS 7 kernel console under KVM?

Nux!
Wed, 08 Oct 2014 16:53:11 -0000

For my templates I use:
grubby --update-kernel=ALL --args="crashkernel=0 at 0 video=1024x768
console=ttyS0,115200n8 console=tty0 consoleblank=0"

HTH

--
Sent from the Delta quadrant using Borg technology!

Nux!
www.nux.ro

----- Original Message -----
> From: "Chris Adams" <linux at cmadams.net>
> To: centos at centos.org
> Sent: Wednesday, 8 October, 2014 17:06:03
> Subject: [CentOS] CentOS 7 kernel console under KVM?

> Is there a way to get GRUB2 and the kernel to run a "serial"
console
> under KVM?
>
> I'm running a Fedora 20 desktop, with libvirt-managed VMs.  When I run
a
> CentOS 6 VM, I can set both the boot loader and kernel up to use ttyS0
> and get a console compatible with "virsh console".
>
> When I try the same with a CentOS 7 VM, it doesn't work.  If I set it
to
> ttyS0, I just don't get anything.  I read that I should use hvc0
> instead (no idea how to set the boot loader to use that); when I set
> that on the kernel command line, the kernel crashes during boot with:
>
> kernel tried to execute NX-protected page - exploit attempt? (uid: 0)
> BUG: unable to handle kernel paging request at ffffffff81a4cfec
> IP: [<ffffffff81a4cfec>] vty_init+0x174/0x174
> PGD 18d3067 PUD 18d4063 PMD 3d9e1063 PTE 8000000001a4c163
>
> If I don't do either, I can add a getty on hvc0 with "systemctl
enable
> serial-getty at hvc0.service", but that doesn't get me the boot
loader or
> kernel messages.
> --
> Chris Adams <linux at cmadams.net>
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