From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from smtp1.osuosl.org (smtp1.osuosl.org [140.211.166.138]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 74EE5C433F5 for ; Wed, 1 Dec 2021 22:03:09 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp1.osuosl.org (Postfix) with ESMTP id F3E6C82FF9; Wed, 1 Dec 2021 22:03:08 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp1.osuosl.org ([127.0.0.1]) by localhost (smtp1.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id ry5skCYx5DbJ; Wed, 1 Dec 2021 22:03:08 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [IPv6:2605:bc80:3010:104::8cd3:938]) by smtp1.osuosl.org (Postfix) with ESMTPS id B3AB482974; Wed, 1 Dec 2021 22:03:07 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id 685FFC000A; Wed, 1 Dec 2021 22:03:07 +0000 (UTC) Received: from smtp4.osuosl.org (smtp4.osuosl.org [140.211.166.137]) by lists.linuxfoundation.org (Postfix) with ESMTP id 62747C000A for ; Wed, 1 Dec 2021 22:03:06 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp4.osuosl.org (Postfix) with ESMTP id 48B73401EF for ; Wed, 1 Dec 2021 22:03:06 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Authentication-Results: smtp4.osuosl.org (amavisd-new); dkim=pass (2048-bit key) header.d=linutronix.de header.b="QK/m6+RY"; dkim=neutral reason="invalid (unsupported algorithm ed25519-sha256)" header.d=linutronix.de header.b="CIcddPGN" Received: from smtp4.osuosl.org ([127.0.0.1]) by localhost (smtp4.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 5MEJVJGL9JoJ for ; Wed, 1 Dec 2021 22:03:05 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.8.0 Received: from galois.linutronix.de (Galois.linutronix.de [IPv6:2a0a:51c0:0:12e:550::1]) by smtp4.osuosl.org (Postfix) with ESMTPS id 9FA85401D6 for ; Wed, 1 Dec 2021 22:03:05 +0000 (UTC) From: Thomas Gleixner DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1638396182; 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=ADwxWazAFdxjnnTjDcEZ69QP7SpknGKLWrCglJZzXdA=; b=QK/m6+RYPwia5iAr3NXO/05AHAjPLCSzrsxc6Ktr32hn13hDblo2sRMPP1PxKwJYYxRUEl sCNTDTPJRbK+jFICII8cx1uRTV/LMZ41abXLgbjs9TcsKI5FxsxVx1g/jpj7oHJPUaPPBF L6pNnbq40ttJDHKvrHDJpDauCRL/QbkiskY1zOCZkmhepI0pw2w2vSmb69S62+fEIn+d3A gU7m2pAB1ZbuJwl4w3P95hvccRHQMFAAu+0dr+GLphihi0/Yn+5k7cJ8MJe71JDyRXAdOu kWxuAU5+Sx+weFWOI7iDHXe/OiRCQE8B1bgyu3QqG7R3UXBDoTV71yHX6UrnVA== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1638396182; 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=ADwxWazAFdxjnnTjDcEZ69QP7SpknGKLWrCglJZzXdA=; b=CIcddPGNmHG0Q/Y/LWnRlffIbbnQdDGWmDfpzGwfLJhOJGBvuWpowJSI4GBTe7cwqYpBd1 N/K0G4B0vGPJ7oBw== To: Dave Jiang , Jason Gunthorpe Subject: Re: [patch 21/32] NTB/msi: Convert to msi_on_each_desc() In-Reply-To: <45302c9d-f7a0-5a47-d0be-127d0dea45fb@intel.com> References: <20211126230957.239391799@linutronix.de> <20211126232735.547996838@linutronix.de> <7daba0e2-73a3-4980-c3a5-a71f6b597b22@deltatee.com> <874k7ueldt.ffs@tglx> <6ba084d6-2b26-7c86-4526-8fcd3d921dfd@deltatee.com> <87ilwacwp8.ffs@tglx> <87v909bf2k.ffs@tglx> <20211130202800.GE4670@nvidia.com> <87o861banv.ffs@tglx> <20211201001748.GF4670@nvidia.com> <87mtlkaauo.ffs@tglx> <8c2262ba-173e-0007-bc4c-94ec54b2847d@intel.com> <87pmqg88xq.ffs@tglx> <87k0go8432.ffs@tglx> <878rx480fk.ffs@tglx> <45302c9d-f7a0-5a47-d0be-127d0dea45fb@intel.com> Date: Wed, 01 Dec 2021 23:03:02 +0100 Message-ID: <875ys87zl5.ffs@tglx> MIME-Version: 1.0 Cc: Allen Hubbe , linux-s390@vger.kernel.org, Kevin Tian , x86@kernel.org, Ashok Raj , Greg Kroah-Hartman , Marc Zygnier , Heiko Carstens , LKML , iommu@lists.linux-foundation.org, Christian Borntraeger , Alex Williamson , Joerg Roedel , Bjorn Helgaas , linux-pci@vger.kernel.org, linux-ntb@googlegroups.com, Logan Gunthorpe , Megha Dey X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" On Wed, Dec 01 2021 at 14:49, Dave Jiang wrote: > On 12/1/2021 2:44 PM, Thomas Gleixner wrote: >> How that is backed on the host does not really matter. You can expose >> MSI-X to the guest with a INTx backing as well. >> >> I'm still failing to see the connection between the 9 MSIX vectors and >> the 2048 IMS vectors which I assume that this is the limitation of the >> physical device, right? > > I think I was confused with what you were asking and was thinking you > are saying why can't we just have MSIX on guest backed by the MSIX on > the physical device and thought there would not be enough vectors to > service the many guests. I think I understand what your position is now > with the clarification above. This still depends on how this overall discussion about representation of all of this stuff is resolved. >> What needs a subdevice to expose? Can you answer that too please? Thanks, tglx _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu