Re: [PATCH 4/8] x86/traps: Demand-populate PASID MSR via #GP

[Fenghua Yu]

Hi, Peter,

On Wed, Sep 22, 2021 at 11:07:22PM +0200, Peter Zijlstra wrote:
> On Mon, Sep 20, 2021 at 07:23:45PM +0000, Fenghua Yu wrote:
> >  
> > +	if (user_mode(regs) && fixup_pasid_exception())
> > +		goto exit;
> > +
> >  	if (static_cpu_has(X86_FEATURE_UMIP)) {
> >  		if (user_mode(regs) && fixup_umip_exception(regs))
> >  			goto exit;
> 
> So you're eating any random #GP that might or might not be PASID
> related. And all that witout a comment... Enlighten?

I will add a comment here.

Thanks.

-Fenghua