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AKwUvBxgv/L5ifWVsAEvYo+dt7wjIi7wXpLeCsYJrovuZib4VKIZ7muOBLbP5BzFbosIjoGUN68=@vger.kernel.org X-Gm-Message-State: AFuF++k6zECV/qqzM7uK4GB9nbTLUPAtOmJU3sdbGG4QnKISpkWoo5Ye cy4aTcuPpEtppd2ABb4fTUDz03sI4+cIoTjFHRpDN/SlsXlUdLRH51mnGlqGLbSlFuZ6RkK4k/G 2BCFOWw== X-Received: from pjsa5.prod.google.com ([2002:a17:90a:be05:b0:3a0:87bc:37f5]) (user=seanjc job=prod-delivery.src-stubby-dispatcher) by 2002:a17:90b:38cc:b0:39e:5166:df84 with SMTP id 98e67ed59e1d1-3a07e51cc4bmr2333974a91.16.1790167592649; Wed, 23 Sep 2026 05:46:32 -0700 (PDT) Date: Wed, 23 Sep 2026 05:46:30 -0700 In-Reply-To: <8edfb868bcabfef8e2dee96c0831cc3f1234367e.camel@intel.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260921235656.1107929-1-seanjc@google.com> <8edfb868bcabfef8e2dee96c0831cc3f1234367e.camel@intel.com> Message-ID: Subject: Re: [PATCH] KVM: VMX: Formally define KVM's "0xdead" exit reason used for failed VM-Enter From: Sean Christopherson To: Rick P Edgecombe Cc: "pbonzini@redhat.com" , Xiaoyao Li , "kvm@vger.kernel.org" , "linux-kernel@vger.kernel.org" , Yan Y Zhao , "binbin.wu@linux.intel.com" Content-Type: text/plain; charset="us-ascii" On Wed, Sep 23, 2026, Rick P Edgecombe wrote: > On Mon, 2026-09-21 at 16:56 -0700, Sean Christopherson wrote: > > Add EXIT_REASON_UNDEFINED to track KVM's magic "0xdead" value that's used > > to stuff the exit reason on a failed VM-Enter so that the magic can be > > reused by TDX, and to make it more obvious that it's an arbitrary, KVM- > > defined value (though the whole "dead" thing makes it pretty darn obvious). > > > > Opportunistically add a compile-time assert to ensure the KVM-defined exit > > reason never collides with a "real" exit reason. > > > > No functional change intended. > > > > Cc: Xiaoyao Li > > Cc: Yan Zhao > > Cc: Binbin Wu > > Cc: Rick Edgecombe > > > Cc: stable@vger.kernel.org > > ?? To help the backport of the DOS stuff? Seems strange: "no functional change > intended, CC stable" Yep, I massaged two of those patches ("thanks" incoming soon) to yield: KVM: TDX: Stuff exit_reason with UNDEFINED on wait_for_sept_zap return KVM: TDX: Set bits 31:16 to 0 and use UNDEFINED when synthesizing exit reason