From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C764D21B192 for ; Mon, 7 Apr 2025 21:20:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744060815; cv=none; b=ngi06ggP7JVRjlhI9ALAZdzutnv0A4JWkOiqWibGfMSS97YcY5K0B21LYwfrl3wRD+sSPZjNqq4QVEcQs3NyEgFxClAxcFquu6NbFVqFUmheNvTSRzVK5pLB91aT7g0VnrHLhTV3bNDf1MtUVaAuFFb/Mp2SRN6cy4ovBOhQeS0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744060815; c=relaxed/simple; bh=D44uPz9eheA7kkPhO8XxXusezFNcHg7xlYRPONW/cJk=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=FHEe2lfYI5yBqfpF4nhj9X5ee1uun96LqvPkUut1R/jlJWiyNEl5LfgTYLBBbXfOMrOzYsLXa/eIjClDjLML9B3w5n3irvWhhepwnPhJg/eKTl0BuuMcYgHsIax+2afJ3M5KmWHnKEHJK3n7cYawkzNV0ziXPnxdg4LjNRsa5x4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=DR52gbD3; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="DR52gbD3" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1744060812; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=SSsX1dq63c6Sd4M1C8Om043J0hULe8kAcy41TIjjkwo=; b=DR52gbD3uWPuuTq/FQPXEAJrvvm2kzdnYAO2m/cz14QEXJl5UAiCiWG2V6Bum6F0wBplkK LDUj0nC5U3u7AioYjRpsvandjGi9L7aAlK5MHN3JYEq53C5NdZM1H+zWQQY9dq9BPZzHSD 1z6ow+BpAj1B5J1CXDl2bz5j6wJSI30= Received: from mail-wm1-f71.google.com (mail-wm1-f71.google.com [209.85.128.71]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-82-hD-e1sjXN8GrxFwd-zy20g-1; Mon, 07 Apr 2025 17:20:11 -0400 X-MC-Unique: hD-e1sjXN8GrxFwd-zy20g-1 X-Mimecast-MFC-AGG-ID: hD-e1sjXN8GrxFwd-zy20g_1744060810 Received: by mail-wm1-f71.google.com with SMTP id 5b1f17b1804b1-43cec217977so30961925e9.0 for ; Mon, 07 Apr 2025 14:20:11 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1744060810; x=1744665610; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=SSsX1dq63c6Sd4M1C8Om043J0hULe8kAcy41TIjjkwo=; b=atDHXaR/2k2FMt/gqVtmWLs6+PoUe3Mq2TVgZKtyIeZ4h+/LwsAMdhCVQZQSTvuNKg e11/Qtkhw1v+5WxI+h+AgI3QuyahM97LdHJHgdBs7I8cLlzUybi/Dga93KUYyq3JNvwY WY/iSkEKhm3QxWLwcEKKxVqFD4wCrKnD1uCRK7IHWGMFkQE+eAMATDa1TCAgW0fAMygl P3DG4cLSRZIB7eJI5rvJ5tR9mQDMT5YABZvmTKIBFSlW6fEQkwpNq8w/GtL6JH98R2HI IBFRs6A3ahnTlBZPZtvxVHeFCVt/bicZZvKx1MHLPtvPI94XFDJrtRCJPMUo14EonRdM xCyw== X-Forwarded-Encrypted: i=1; AJvYcCWKpMT+sZoQ2xYO2/HYkO/3sqZLc4zYlAprz/XFJq9WY8M4cn3m5uZNbPNus2gPLdXobSYQ1lk=@vger.kernel.org X-Gm-Message-State: AOJu0YzundjsvLPwSCOF6N0LpB0iuOyIVMIBXNy6FegU6Wb9Vglzx5ee UXSyZfKBdXNoUfChrtQwF2N6w1YutocaAdYoun+PXD09/3TnTgnUGU/HvqbqAUu8/ZcXeJuPENZ /924ZOctqI7Fp+jTsnFLLTEobhu1vY9GUXUOwRYXPIobz4ATTK1vfzw== X-Gm-Gg: ASbGncsvKnW1WpIruf0qWYY40HtBs+pg+9nQSt8F5fSs4AbipmiD2F2hwQljW8une+r p9BG3eQwCMkKsBhAGIC0dbTOvvzp/eEBSxHAdZUNwZo4Y+O3t1Rl1HXOdPhE5D6hqe6xTHxvFE4 j/Gab4qhUcBgCmayIMbISxs53VJh80in/82GT8RAc/ko7TQxk374N9IhSGS8HQWaXB3PFTGZXx+ ufzjbxqHolrpFCtrSi5iCYKCUioF1yRNTDlzmb3FRgk4fOP/BxdikVtg/kQrgRwff/9G6Ut5gV3 ES9lfX5ivg== X-Received: by 2002:a05:6000:1847:b0:39a:ca05:5232 with SMTP id ffacd0b85a97d-39cb3575befmr12282708f8f.5.1744060810334; Mon, 07 Apr 2025 14:20:10 -0700 (PDT) X-Google-Smtp-Source: AGHT+IF7YJ3OkxxdjofaKEYzWTRjjkkLHkcDI8DZkVD+3A0SRfbIhe0O3F820zBX+uC97qfAn2pPXw== X-Received: by 2002:a05:6000:1847:b0:39a:ca05:5232 with SMTP id ffacd0b85a97d-39cb3575befmr12282687f8f.5.1744060809960; Mon, 07 Apr 2025 14:20:09 -0700 (PDT) Received: from redhat.com ([2a0d:6fc0:1517:1000:ea83:8e5f:3302:3575]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-43ec34a7615sm140530535e9.9.2025.04.07.14.20.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 07 Apr 2025 14:20:09 -0700 (PDT) Date: Mon, 7 Apr 2025 17:20:05 -0400 From: "Michael S. Tsirkin" To: David Hildenbrand Cc: Daniel Verkamp , Halil Pasic , linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org, virtualization@lists.linux.dev, kvm@vger.kernel.org, Chandra Merla , Stable@vger.kernel.org, Cornelia Huck , Thomas Huth , Eric Farman , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , Wei Wang Subject: Re: [PATCH v1] s390/virtio_ccw: don't allocate/assign airqs for non-existing queues Message-ID: <20250407170239-mutt-send-email-mst@kernel.org> References: <20250407042058-mutt-send-email-mst@kernel.org> <0c221abf-de20-4ce3-917d-0375c1ec9140@redhat.com> <20250407044743-mutt-send-email-mst@kernel.org> <20250407045456-mutt-send-email-mst@kernel.org> <33def1b0-d9d5-46f1-9b61-b0269753ecce@redhat.com> <88d8f2d2-7b8a-458f-8fc4-c31964996817@redhat.com> <3bbad51d-d7d8-46f7-a28c-11cc3af6ef76@redhat.com> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <3bbad51d-d7d8-46f7-a28c-11cc3af6ef76@redhat.com> On Mon, Apr 07, 2025 at 08:47:05PM +0200, David Hildenbrand wrote: > > In my opinion, it makes the most sense to keep the spec as it is and > > change QEMU and the kernel to match, but obviously that's not trivial > > to do in a way that doesn't break existing devices and drivers. > > If only it would be limited to QEMU and Linux ... :) > > Out of curiosity, assuming we'd make the spec match the current QEMU/Linux > implementation at least for the 3 involved features only, would there be a > way to adjust crossvm without any disruption? > > I still have the feeling that it will be rather hard to get that all > implementations match the spec ... For new features+queues it will be easy > to force the usage of fixed virtqueue numbers, but for free-page-hinting and > reporting, it's a mess :( Still thinking about a way to fix drivers... We can discuss this theoretically, maybe? -- MST