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Thu, 19 Feb 2026 04:27:31 -0800 (PST) X-Received: by 2002:a05:600c:314b:b0:482:eec4:772 with SMTP id 5b1f17b1804b1-483710962c5mr285733525e9.32.1771504050979; Thu, 19 Feb 2026 04:27:30 -0800 (PST) Received: from imammedo ([213.175.46.86]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4839f978339sm16599765e9.15.2026.02.19.04.27.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 19 Feb 2026 04:27:30 -0800 (PST) Date: Thu, 19 Feb 2026 13:27:29 +0100 From: Igor Mammedov To: Peter Maydell Cc: qemu-devel@nongnu.org, mst@redhat.com, anisinha@redhat.com, pbonzini@redhat.com, shannon.zhaosl@gmail.com, philmd@linaro.org, zhao1.liu@intel.com, rad@semihalf.com, leif.lindholm@oss.qualcomm.com Subject: Re: [PATCH 00/11] Introduce ACPI watchdog for Q35 and arm/virt boards Message-ID: <20260219132729.1eb521cb@imammedo> In-Reply-To: References: <20260206131438.1857182-1-imammedo@redhat.com> X-Mailer: Claws Mail 4.3.1 (GTK 3.24.51; x86_64-redhat-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=170.10.129.124; envelope-from=imammedo@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.045, 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, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=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 Wed, 18 Feb 2026 19:10:02 +0000 Peter Maydell wrote: > On Fri, 6 Feb 2026 at 13:14, Igor Mammedov wrote: > > > > Windows doesn't ship built-in TCO watchdog driver, and users are > > forced to install vendor specific driver(s) if such exists. > > However OS provides a generic watchdog driver that uses > > ACPI WDAT table [1] to abstract actual hardware behind it. > > The same applies to ARM version of Windows. > > > > This series adds > > * WDAT table tailored for TCO watchdog that Q35 already > > has as part of ICH9 chipset and a knob to enable it. > > * SBSA GWDT to arm/vit machine with WDAT table tailored > > for it and necessary tweaks to GWDT to make usable > > with WDAT driver. > > > Also CCing SBSA folks to see if they are interested in adding it to their > > reference machine > > The sbsa-ref machine already implements an sbsa-gwdt watchdog... yep, but not exposed as WDAT one. Hence the question. It also would need clock-frequency tweak if we are expose it via ACPI. PS: I don't even see DT mapping for it, looks like sbsa-gwdt is just wired for the sake of compliance with the spec. Well sbsa-ref specific firmware could just opencode it's mapping instead of getting it from QEMU. > > -- PMM >