[PATCH 0/2] kvm: disable virtualization on kdump

[Eric W. Biederman]

Avi Kivity <avi at redhat.com> writes:

> There's no way to query whether vmx is enabled or disabled, AFAICT.  So we have
> to execute vmxoff and ignore possible #UDs.
>
> If we trust the exception handlers, there's no problem.  Otherwise we need to
> replace the current #UD handler with an iret (perhaps switching temporarily to
> another IDT).

Ugh.  We already change the IDT on that code path so that
may be a way to go.

> The general kexec path also wants this fixed.

It looks like someone hooked the reboot notifier which should
be called on the normal kexec path.

Eric