From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pf1-f199.google.com (mail-pf1-f199.google.com [209.85.210.199]) (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 0E6A92C3268 for ; Tue, 11 Aug 2026 00:48:10 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.199 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786409292; cv=none; b=GkRSNSlu38gMq7+1jx9dce8A6vAaDZeOn5fy44oXJ+fry/9Ma/8P6t+Ak3GSLisai+x/aNnGPCRbdL3yLejE6bwvJ1ipxBquGRSATAXhestXGljpv/CDK+MEN4W126ndhdkWt94ihNTeGkg/m7KAUcIEWGjS4JL5ZEjaV6cewoY= 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=OkF58ZSf; arc=none smtp.client-ip=209.85.210.199 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="OkF58ZSf" Received: by mail-pf1-f199.google.com with SMTP id d2e1a72fcca58-84a3514f912so397127b3a.3 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=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=57qFiioTiYY05WIjQzEmLqwAbaTdR8MUfRFj4mAMGpo=; b=OkF58ZSfbwD6hAKHhtsGYgcNgMEybXUHPMiz4hNTsNgOx1ctbvpYmfpVyUhQIBpYZ4 fMr19mCP+i6W1+8U22BrTOZSqwhwIJf4wmokILGULS0RzbhuwC7yMj9kCvLNQ/atUpDs lEuEuhRB1Z0MCWKI+bKtPYBw0A8S1udDZrzdHnArKrT95pSaG9rLMfUwdVDz5Xo8bo0f MMoYmP/jV/dK1/zSIx6y4G/4RDXVR9hZ/i+ITqxiWpry7ULqVvrVXJejHnhrJ7C7DVEs 1WKWTCfHbbn6hNEoDGCsIgNw7Qv5FvNdSl2vA3QWc0UpGDt/N1gVXud7pbT+o5igmfdi 0wLA== 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=XqPXQUyr+cbtKJ3mCUrZPqOhPccUUatyQQ8PwHlLgqHcE8Lyb5oehmAZJRgVqG8c/V AzCXsN2bMIE8Ke+r6dCyWX+IYV+5WyPOByQBc1YSy55S2n6WcwKPhP95MsSl0oSP7Zkg dUs+p11roY6IYgUWqE+6NuAZ0erKaWzpv/IUcTB1iNFaY2A0bdJ64+nkB4zeFjUCWHCS cKT8Lnh7KLN/B1lAfJ/xcOILo+BaAoAtNdpaonP8we94d84vcd4njYr5CHtaERmmO3tW EVi2qjMFI/RIrGSD0MADMGvML2oZxs0vDq44UAGBrfzRdE4hvqfxzWEoZjMDdrwzR52X HhIA== X-Forwarded-Encrypted: i=1; AHgh+RqiFHrnd9m4k0FvUm2hsQiazHHv3UR77SaIrU36eipqcBM7rrK3GZUDpop+3GELkiGhxxdwpUSjY7NmSHA=@vger.kernel.org X-Gm-Message-State: AOJu0Yyz6ZhRNluXZmQoN366k2ohUQEA9WmYiO8HaU/Na3I44A052OOG OWj9t8QxgYOjacIGmv/zYTPHVglZPJTHEzsHJESYfyFz+hYR/1lQtT28IER7t18XiI/d+BqLBkM tdDNWMg== 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: linux-kernel@vger.kernel.org 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