On 2/26/2020 6:12 PM, Sean Christopherson wrote:
On Tue, Feb 25, 2020 at 01:49:13PM -0800, Jacob Keller wrote:
One other thing that's been bothering me; you mention in a later email that this bug resulting in a crash during boot. The low timestamps also suggest the system is fairly early in its bringup.
But KVM only does VMXON when it actually creates a VM[*]. During boot I would expect the bug to result in KVM being incorrectly loaded/enabled, but that alone wouldn't trigger a crash.
It crashes during hardware enable, specifically in the kvm_cpu_vmxon during the hardware_enable() function.
It doesn't crash until near the end of bootup, and it didn't crash when I kept the system in single-user boot mode.
I assume/hope your system is automatically running some form of virt process at boot? Not that there's anything wrong with that, it's just suprising and I want to make sure there's not something really funky going on.
The system has libvirtd enabled. My guess is that libvirtd starts up and enables hardware. I don't see any actual virtual machines enabled, but I think you're right that this is why it crashes.