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[80.230.25.45]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-490456274ebsm153744685e9.15.2026.05.24.00.15.13 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 24 May 2026 00:15:14 -0700 (PDT) Date: Sun, 24 May 2026 03:15:12 -0400 From: "Michael S. Tsirkin" To: Thierry Escande Cc: qemu-devel@nongnu.org, Paolo Bonzini , Richard Henderson , Eduardo Habkost , Anthony PERARD , xen-devel@lists.xenproject.org Subject: Re: [PATCH 0/4] Xen: Add Q35 initial support for HVM guests Message-ID: <20260524031423-mutt-send-email-mst@kernel.org> References: <20260313164649.794591-1-thierry.escande@vates.tech> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260313164649.794591-1-thierry.escande@vates.tech> Received-SPF: pass client-ip=170.10.129.124; envelope-from=mst@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -24 X-Spam_score: -2.5 X-Spam_bar: -- X-Spam_report: (-2.5 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.445, 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_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_PASS=-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: 2.1.29 Precedence: list List-Id: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On Fri, Mar 13, 2026 at 04:46:56PM +0000, Thierry Escande wrote: > This patch series introduces Q35 chipset support for Xen HVM guests. This is > based on the work from Alexey Gerasimenko (See patchset [1] for reference). > > This series does not implement device passthrough as this will need more work > on the Xen side to support multiple PCI buses. Since Q35 chipset does not > support device hotplugging and with current Xen mechanism for device > passthrough, they have to be plugged to a new PCIe root port, i.e. not the PCI > bus 0. > > As a first step for Q35 guests support, this series implements: > - Legacy interrupt routing for the ICH9 LPC bridge (i.e. not IOAPIC) > - Xen HVM machine initialization in pc_q35_init() > - Access to PCIe Extended Config Space > - Fix for incorrect values and usage for PCIEXBAR masks Xen maintainers, who's merging this? > The corresponding patchset for the Xen Project has been posted at [2]. > > [1] https://lore.kernel.org/xen-devel/cover.1520867740.git.x1917x@gmail.com/ > [2] https://lore.kernel.org/xen-devel/20260313163455.790692-1-thierry.escande@vates.tech/ > > Alexey Gerasimenko (2): > pc/xen: Xen Q35 support: provide IRQ handling for PCI devices > q35: Fix incorrect values for PCIEXBAR masks > > Thierry Escande (2): > q35/xen: Add Xen support for Q35 > xen: Handle PCIe config space size in cpu_ioreq_config() > > hw/i386/pc_piix.c | 2 -- > hw/i386/pc_q35.c | 12 +++++++++++- > hw/i386/xen/xen-hvm.c | 38 ++++++++++++++++++++++++++++++++++++++ > hw/isa/lpc_ich9.c | 16 +++++++++++++--- > hw/pci-host/q35.c | 6 +++--- > hw/xen/xen-hvm-common.c | 11 +++++++---- > include/hw/pci-host/q35.h | 4 ++-- > include/hw/xen/xen.h | 5 +++++ > stubs/xen-hw-stub.c | 4 ++++ > 9 files changed, 83 insertions(+), 15 deletions(-) > > -- > 2.51.0 > > > > -- > Thierry Escande | Vates XCP-ng Developer > > XCP-ng & Xen Orchestra - Vates solutions > > web: https://vates.tech