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[109.65.116.225]) by smtp.gmail.com with ESMTPSA id k5sm19497949wmb.19.2020.09.21.05.39.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 21 Sep 2020 05:39:32 -0700 (PDT) Date: Mon, 21 Sep 2020 08:39:29 -0400 From: "Michael S. Tsirkin" To: Gerd Hoffmann Subject: Re: [PATCH 2/2] microvm: add pcie support Message-ID: <20200921083751-mutt-send-email-mst@kernel.org> References: <20200918121911.5194-1-kraxel@redhat.com> <20200918121911.5194-3-kraxel@redhat.com> <20200918083533-mutt-send-email-mst@kernel.org> <20200921113347.mrdrxwskh5dzkosv@sirius.home.kraxel.org> MIME-Version: 1.0 In-Reply-To: <20200921113347.mrdrxwskh5dzkosv@sirius.home.kraxel.org> Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=mst@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Received-SPF: pass client-ip=216.205.24.124; envelope-from=mst@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/09/21 01:43:11 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -35 X-Spam_score: -3.6 X-Spam_bar: --- X-Spam_report: (-3.6 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1.455, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Eduardo Habkost , Sergio Lopez , qemu-devel@nongnu.org, Paolo Bonzini , Richard Henderson Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Mon, Sep 21, 2020 at 01:33:47PM +0200, Gerd Hoffmann wrote: > On Fri, Sep 18, 2020 at 08:36:14AM -0400, Michael S. Tsirkin wrote: > > On Fri, Sep 18, 2020 at 02:19:11PM +0200, Gerd Hoffmann wrote: > > > Uses the existing gpex device which is also used as pcie host bridge on > > > arm/aarch64. For now only a 32bit mmio window and no ioport support. > > > > > > It is disabled by default, use "-machine microvm,pcie=on" to enable. > > > ACPI support must be enabled too because the bus is declared in the > > > DSDT table. > > > > > > Signed-off-by: Gerd Hoffmann > > > > Can we do the reverse and only support a 64 bit window? > > 32 bit resources are a pain, we support them on x86 for purposes > > of legacy guests ... > > 32bit pci bars too, right? > I suspect we can't that easily take away the 32bit window ... > > take care, > Gerd Yes I forgot, in their wisdom pci sig declared that non prefetcheable memory windows in bridges are always 32 bit :( -- MST