From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pj1-f72.google.com (mail-pj1-f72.google.com [209.85.216.72]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D75803B634E for ; Thu, 30 Jul 2026 00:00:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.216.72 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785369659; cv=none; b=jlPARmxiibJSzCBggCdaEo2+8rx3tdjpU3ovYcr0Q7gxkmFb4mmSD1wlAhyav+qBj+J1Cv5MivliubUKPoWH+lQ1rGBItLOGr3+yKn5dI96aertCyoc1Psaa/9euJIfiPW+MDGNBYrzNBUy/a1JFjPtZdeuMOSyl06DLXD/w25E= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785369659; c=relaxed/simple; bh=4lBXdS0DMR0YWwCA/SBG4es8RBlmNhsJHItOEukqLAE=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=uqu8PM9ahwyT93GiZsRh7sMNSkbi5JJ/2voADr9Ee2DxDFw+BWrrkkRtBgpqhh6960AsHSc/yNqiJHyHiE3xR2gPt6m/QPaE4GDaAyodtt4a8puVCyUQqMRCz5AxIJNEQilqYCjrWXWgmFRKXbh8qGIjbBmeGbxZEjY8ykD6eLY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--seanjc.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=CiwXhIcA; arc=none smtp.client-ip=209.85.216.72 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--seanjc.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="CiwXhIcA" Received: by mail-pj1-f72.google.com with SMTP id 98e67ed59e1d1-38ea32e57e2so2587622a91.1 for ; Wed, 29 Jul 2026 17:00:57 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1785369657; x=1785974457; darn=vger.kernel.org; h=content-type:cc:to:from:subject:message-id:references:mime-version :in-reply-to:date:from:to:cc:subject:date:message-id:reply-to :content-type; bh=eR/xGQAZeugJZrdO5qx2sNHVhiF2YISzZIi0PEeUu6E=; b=CiwXhIcATxb7Rf8omYXSyudTgl4570upddtCxlIE6XpRDiRJfBrgnVXJWtWML+nm0W a+ncRkJXiJ6bvKq0rUlwdrAPXOI7jygFSN6lyajjeWgSIrcwGSUM8qdaLWHQEZRllu5u BTofkL0Enx7hywjymWM0cqul0JkQisOdaRPPFx3/rkiPmq6psv1iLDCaO1s5mBStBid5 XCXhIIcncV/Iyxn7SdSOhB4JwX6pAbtRtjlcdfZSVYNZAYoV+l1UurmGcZypcRv0Bpqj RWNohNzQCiWpd99Omzsxp1eIHdkctG1beeaaUjTitmqEHpoq/bzkv1qpVS7Tp03tCjHa 8X9Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1785369657; x=1785974457; h=content-type:cc:to:from:subject:message-id:references:mime-version :in-reply-to:date:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to:content-type; bh=eR/xGQAZeugJZrdO5qx2sNHVhiF2YISzZIi0PEeUu6E=; b=q3zopMMnKGi8gVa6gFf/gnxNg14GfzMf/rdIp+vfpPzgMsw8KcrO+RQCjghZUm1nwI dylSODaaErru4izZLoXf+/JWcTRQm/wJp1Zbz4WC2E7fNK5rn/OWdy641NXdctxIgenw Ybb633Ngw3FbigvEie6JcKX1KsLKQY7FRE47hkqrvU2YKR/G/hC4nfAh4vPS5UnowPOA 2ouerqQMlmREiHIoMEGjGpUpdkI/lmKwL6xwo/RnDTBb329BhBtSsxn4pTx3oKWPt8F9 6ABLZLfsQc6hDcbgKtW0pKG8CudJaeh/cNLVLtzoIbCSdBFBVGSiRwmRrYmugNVrXrVB qz4A== X-Forwarded-Encrypted: i=1; AHgh+RoVs2ajocXfwRZfl7DXQ44GeoGVesMn+PpP74FxRUqH4aQt5IdsJRcRV7r+UVRhyUDVlN3UvBmiUS/u1cg=@vger.kernel.org X-Gm-Message-State: AOJu0YwxT5ueqXQDc6ihR9CUzIEQPrPQ4JPtBSc1BA12pbhAmYmLgN1Y Ky3qPBWcoO7/sQUgSIsn5qs1MP504Nxdyw5dKrclhPmGv5FpEsWkYs1vVtfrZu39nMO6AvzE/PP ivSTSyw== X-Received: from pjzv12.prod.google.com ([2002:a17:90b:40c:b0:38e:bf7e:bfd6]) (user=seanjc job=prod-delivery.src-stubby-dispatcher) by 2002:a17:90b:2552:b0:387:e0db:3d8f with SMTP id 98e67ed59e1d1-38f9c076c92mr286091a91.42.1785369656868; Wed, 29 Jul 2026 17:00:56 -0700 (PDT) Date: Wed, 29 Jul 2026 17:00:56 -0700 In-Reply-To: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: Message-ID: Subject: Re: [PATCH v6 15/20] KVM: x86: Guard valid XCR0.APX settings From: Sean Christopherson To: Christian Ludloff Cc: "Chang S. Bae" , pbonzini@redhat.com, kvm@vger.kernel.org, x86@kernel.org, linux-kernel@vger.kernel.org Content-Type: text/plain; charset="us-ascii" 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!