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[79.180.48.224]) by smtp.gmail.com with ESMTPSA id w4sm2509730qts.92.2020.03.05.07.39.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 05 Mar 2020 07:39:22 -0800 (PST) Date: Thu, 5 Mar 2020 10:39:17 -0500 From: "Michael S. Tsirkin" To: Joerg Roedel Cc: Auger Eric , Jean-Philippe Brucker , iommu@lists.linux-foundation.org, virtualization@lists.linux-foundation.org, linux-pci@vger.kernel.org, bhelgaas@google.com, jasowang@redhat.com, kevin.tian@intel.com, sebastien.boeuf@intel.com, jacob.jun.pan@intel.com, robin.murphy@arm.com Subject: Re: [PATCH v2 1/3] iommu/virtio: Add topology description to virtio-iommu config space Message-ID: <20200305103759-mutt-send-email-mst@kernel.org> References: <20200228172537.377327-2-jean-philippe@linaro.org> <20200302161611.GD7829@8bytes.org> <9004f814-2f7c-9024-3465-6f9661b97b7a@redhat.com> <20200303130155.GA13185@8bytes.org> <20200303084753-mutt-send-email-mst@kernel.org> <20200303155318.GA3954@8bytes.org> <20200303105523-mutt-send-email-mst@kernel.org> <20200304133707.GB4177@8bytes.org> <20200304142838-mutt-send-email-mst@kernel.org> <20200304215001.GD3315@8bytes.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200304215001.GD3315@8bytes.org> Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org On Wed, Mar 04, 2020 at 10:50:02PM +0100, Joerg Roedel wrote: > On Wed, Mar 04, 2020 at 02:34:33PM -0500, Michael S. Tsirkin wrote: > > All these extra levels of indirection is one of the reasons > > hypervisors such as kata try to avoid ACPI. > > Platforms that don't use ACPI need another hardware detection mechanism, > which can also be supported. But the first step here is to enable the > general case, and for x86 platforms this means ACPI. > > Regards, > > Joerg Frankly since a portable way to do it is needed anyway I don't see why we also need ACPI. -- MST