Re: [PATCH v6 15/20] KVM: x86: Guard valid XCR0.APX settings

[Sean Christopherson]

On Wed, Jul 29, 2026, Christian Ludloff wrote:
> > In the non-compacted XSAVE format, APX and MPX conflict on the same
> > offset. Although MPX is being deprecated in practice, KVM should
> > explicitly reject such configurations that set both bits.
> 
> The ISA does not preclude an implementation that
> supports both MPX and APX simultaneously.
> 
> Properly written SW deals with that possibility...  :)

Off-topic, can you fix your mail client/configuration to use In-Reply-To?  I assume
that's what breaks threading for myself and lore.

Thanks!