Re: [Xen-devel] [PATCH v3 01/11] x86/boot: enumerate documentation for the x86 hardware_subarch

[Ingo Molnar <mingo@xxxxxxxxxx>]

* Andy Lutomirski <luto@xxxxxxxxxxxxxx> wrote:

> On Feb 24, 2016 12:33 AM, "Ingo Molnar" <mingo@xxxxxxxxxx> wrote:
> >
> > For hard coded platform quirks I'd suggest we add x86_platform.quirks 
> > flags. For
> > example the F00F hack for Xen could be done via:
> >
> >         x86_platform.quirks.idt_remap = 0;
> >
> 
> Don't we unconditionally remap the IDT?  I think Kees did it for
> general purpose hardening due to our complete inability to hide the
> IDT address. I.e. I think we can remove the f00f condition entirely.

Yeah, indeed - I only judged by the (limited) patch context and assumed the Xen 
problem was with IDT remapping.

But what the quirk really does is only to avoid printing the f00f workaround - 
i.e. a cosmetic change. I think we should just drop the paravirt_enabled() 
check.

Thanks,

        Ingo

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