Re: [PATCH v2 3/5] KVM: SVM: Manually context switch DEBUGCTL if LBR virtualization is disabled

[Sean Christopherson]

On Thu, Feb 27, 2025, Ravi Bangoria wrote:
> > Somewhat related but independent: CPU automatically clears DEBUGCTL[BTF]
> > on #DB exception. So, when DEBUGCTL is save/restored by KVM (i.e. when
> > LBR virtualization is disabled), it's KVM's responsibility to clear
> > DEBUGCTL[BTF].
> 
> Found this with below KUT test.
> 
> (I wasn't sure whether I should send a separate series for kernel fix + KUT
> patch, or you can squash kernel fix in your patch and I shall send only KUT
> patch. So for now, sending it as a reply here.)

Go ahead and send the KUT test.  They two repositories evolve independently no
matter the order, just put a Link to lore of the kernel fix/discussion.

Thanks a ton for writing a test!