Re: [PATCH v4 4/4] x86/reboot: Disable SVM, not just VMX, when stopping CPUs

Sean Christopherson
2022-11-30T23:39:06Z

On Wed, Nov 30, 2022, Sean Christopherson wrote:
> Disable SVM and more importantly force GIF=1 when halting a CPU or
> rebooting the machine. Similar to VMX, SVM allows software to block
> INITs via CLGI, and thus can be problematic for a crash/reboot. The
> window for failure is smaller with SVM as INIT is only blocked while
> GIF=0, i.e. between CLGI and STGI, but the window does exist.
>
> Fixes: fba4f472b33a ("x86/reboot: Turn off KVM when halting a CPU")
> Cc: stable@vger.kernel

Argh, forgot the .org, and of course my scripts then failed to filter out the
address.