From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pg1-f197.google.com (mail-pg1-f197.google.com [209.85.215.197]) (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 0F2952F6188 for ; Tue, 11 Aug 2026 00:48:10 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.215.197 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786409292; cv=none; b=OiXQeDpy/MUcmB8y0fHkNyL24wxoEpAHg7r5r2+4SW3MwZB9kNyY+2TJlKc86Nq+A3wobKXX83zgh4NJPtRTXE0dyLrp5OWd+yHLZNoUM+PVhobVK3ckV0cbmqsSNGsf7kevrMKjhOICchnIH3UAaFgTBeU6i8JqAbEimbI7g4Q= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786409292; c=relaxed/simple; bh=SW0ZwvYoKhM6FW3ut7EHho8mS7J5qQPyYhcgYTaD0w4=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=QjK9JVD5l2torxKpVlF4AH+TYvxamxUmPTaLGRkJPhXi+qRb0440GswHZ45EEREJCflzGU23YLr8+stgWz/3WaslY22+olfF+DwsaYAem5e42YRamrWna8v2CqlJU8Wd+SDpAUuna77KlPe1UJ/bTWMAWPJCBy3UBUAJrZeb94o= 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=NRsuR89c; arc=none smtp.client-ip=209.85.215.197 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="NRsuR89c" Received: by mail-pg1-f197.google.com with SMTP id 41be03b00d2f7-cb733fc5024so497622a12.2 for ; Mon, 10 Aug 2026 17:48:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1786409290; x=1787014090; darn=lists.linux.dev; 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=57qFiioTiYY05WIjQzEmLqwAbaTdR8MUfRFj4mAMGpo=; b=NRsuR89cc9ITuRQt504cj9p/OiXEKhVExfvQGGVFi9gO9v0Xh04ZZ9RPMxgyBDdPGk r6tZlankuL8WMh7CZZwAK7ZEeOE2or/Ij0I0IrHZPlF0wPLHoKNLDRucNV2G4DN5/OZ0 +gQuMYNGLZQFuxTkcNJvnJDcLAzH/6ONS//32lp+W6I7SdBXJ29nLHB1wiQ19U9rnenw fWIohHL6acoBdORca931wzQttOtK1GPqY6w07VHSnk4Lng8Bj/WKdA7lwLjZ4xtcdhOO 5Kza1RP5OCaaDR3pPhVjb+bJ2tOELNfzQjGnsHh6ThV/pN5BpZcAqnm2678grpQNHhP3 76JA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1786409290; x=1787014090; 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=57qFiioTiYY05WIjQzEmLqwAbaTdR8MUfRFj4mAMGpo=; b=Rq6C0OPrx4iMrNmnPhqHZzV3vTyRwiGdMQas1+CYfmLPJ4ybxQIwUql+WhAih1OmNR eNrBaDiAocnO37JEZfo0VrNdKi5A4jxXgDZCT77I8p30UMDWSt+iWbIPCYGTZM/42tMs ujdUevcpoIz5Sslmi+4dpB2QI+OhulX2Nk/zdgMVfscT0eiaLy2LxOeg6qo950NV8Yfy Xs8lkl7vfWV8wEGzAJ1I4L0r05EvgtdMNk8bV14bRvvo9YKqkIOBJX0O4WZ5Odgyxdtl 5bg95Tgi/WBP6gSqzcbUhCS0wNLSot81wlaXvaKkhja+q87sBkcM5MLb0hbkuJLk+NGc 31sA== X-Forwarded-Encrypted: i=1; AHgh+Rq7ukQXIoxpXT03tx7/JLJ3g5wcjU9weAhhr1bNKnxqSVZOOCueK85QS0ykb/Vd417IAKI8DQ==@lists.linux.dev X-Gm-Message-State: AOJu0YwgWK6Tj5YcoXHHtiOXDN011hzxt5sBznRYLO1qCZAWwWyzRlcb LW2E3OLVDXI/AH6PlORi2BBHlaFsxuYrTiCZp1CiTSQSRh9IK2GnZMTOEs4mlqX9pYQXZDepG++ 8jtYMdA== X-Received: from pgbgf7.prod.google.com ([2002:a05:6a02:2cc7:b0:cbe:9522:2c9d]) (user=seanjc job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6a00:4519:b0:847:968d:b101 with SMTP id d2e1a72fcca58-84f2e03916amr55995346b3a.21.1786409290016; Mon, 10 Aug 2026 17:48:10 -0700 (PDT) Date: Mon, 10 Aug 2026 17:48:09 -0700 In-Reply-To: <20260713105033.15405-1-sarunkod@amd.com> Precedence: bulk X-Mailing-List: iommu@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260713105033.15405-1-sarunkod@amd.com> Message-ID: Subject: Re: [RFC PATCH v3 0/6] Add support for AMD IOMMU GAPPI From: Sean Christopherson To: Sairaj Kodilkar Cc: "Borislav Petkov (AMD)" , "H. Peter Anvin" , "Joerg Roedel (AMD)" , "Paul E. McKenney" , Andrew Morton , Dapeng Mi , Dave Hansen , Eric Biggers , Feng Tang , Ingo Molnar , Jakub Kicinski , Jonathan Corbet , Li RongQing , Marco Elver , Paolo Bonzini , Randy Dunlap , Robin Murphy , Shuah Khan , Suravee Suthikulpanit , Thomas Gleixner , Vasant Hegde , Will Deacon , iommu@lists.linux.dev, kvm@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, x86@kernel.org Content-Type: text/plain; charset="us-ascii" On Mon, Jul 13, 2026, Sairaj Kodilkar wrote: > On newer generations of AMD processors, IOMMU AVIC/x2AVIC guest-mode interrupt > remapping can use Guest APIC Physical Processor Interrupt (GAPPI) as an > alternative host-notification path when device interrupts target a vCPU that > is not running (IRTE[IsRun] = 0). Why is this still an RFC? I mean that in a good way. I haven't looked at this super duper closely, but the patches all look to be in generally good shape. I.e. this seems well beyond RFC, unless there's a hard blocker or something, e.g. known bugs? Another bigger picture comment: I'm very tempted to say this has a hard dependency on KVM's irq_test[*] adding support for AMD. I know it's being worked on, but I can't remember who is doing the work, or when it's expected... [*] https://lore.kernel.org/all/20260626213534.3866178-1-seanjc@google.com