From: Sean Christopherson <seanjc@google.com>
To: Christian Ludloff <ludloff@gmail.com>
Cc: "Chang S. Bae" <chang.seok.bae@intel.com>,
pbonzini@redhat.com, kvm@vger.kernel.org, x86@kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v6 15/20] KVM: x86: Guard valid XCR0.APX settings
Date: Wed, 29 Jul 2026 17:00:56 -0700 [thread overview]
Message-ID: <amqUOP4MuvjQoncm@google.com> (raw)
In-Reply-To: <CAKSQd8X56f585VcsoXQbOhMoDfgffwfjXvxSv9Y2sqv6NcJspg@mail.gmail.com>
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!
next prev parent reply other threads:[~2026-07-30 0:00 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-29 23:25 [PATCH v6 15/20] KVM: x86: Guard valid XCR0.APX settings Christian Ludloff
2026-07-30 0:00 ` Sean Christopherson [this message]
-- strict thread matches above, loose matches on Subject: below --
2026-07-29 19:16 [PATCH v6 00/20] KVM: x86: Enable APX for guests Chang S. Bae
2026-07-29 19:16 ` [PATCH v6 15/20] KVM: x86: Guard valid XCR0.APX settings Chang S. Bae
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