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 lists1p.gnu.org (lists1p.gnu.org [209.51.188.17]) (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 87F25FF886D for ; Tue, 28 Apr 2026 14:14:51 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists1p.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1wHjCS-0008SU-KG; Tue, 28 Apr 2026 10:14:08 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists1p.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1wHjCQ-0008Rx-Cf for qemu-devel@nongnu.org; Tue, 28 Apr 2026 10:14:06 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1wHjCN-0002Ke-Cy for qemu-devel@nongnu.org; Tue, 28 Apr 2026 10:14:06 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1777385642; 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: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=GMgaMMRHBTfcJuhrkBN4N6UBYrSouh7MkAX9cEmU3Lk=; b=Wi5Yrx/+8X0Q6/arZQKnh4b6zhBDFuT1l3x8vwR1H1pMguGLO/4OYeoUR/+GpP9y73KeTr UhoR99NhHvKriROONENUiT2DYtRhKE8+yLd9NOnoj9Iwbn19Jn5UfEgv23gaC3KDkRXMFQ Q8oBtexSdoP8LyNV4M8/trYJyL+BLS0= Received: from mail-oo1-f71.google.com (mail-oo1-f71.google.com [209.85.161.71]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-416-Vd7s1sRKNeCVuDZ4sgQbHg-1; Tue, 28 Apr 2026 10:12:23 -0400 X-MC-Unique: Vd7s1sRKNeCVuDZ4sgQbHg-1 X-Mimecast-MFC-AGG-ID: Vd7s1sRKNeCVuDZ4sgQbHg_1777385542 Received: by mail-oo1-f71.google.com with SMTP id 006d021491bc7-696307c7f2eso2336941eaf.0 for ; Tue, 28 Apr 2026 07:12:22 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=google; t=1777385542; x=1777990342; darn=nongnu.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:subject:cc:to:from:date:from:to:cc:subject:date :message-id:reply-to; bh=GMgaMMRHBTfcJuhrkBN4N6UBYrSouh7MkAX9cEmU3Lk=; b=igi5+hxvCSmelGP2L+MieNEHXUi3yIUqcH5TV9p5DhDfuPZz/P6QPLXB/7KBka9eNR FsoQga2GMqxZhERcBHix/1+OvHCrDV7vFS9zpDBiGGu7Zt5ENfLy5Rdvf0Ae3JDIATcf dYz3J9gQmff/tQ6vrV1V41gouvcZOnUoJXBR4Z/ffhO5GT1MdLB8R7XP+ZZiyM+cR2Ug l4zrNXo0XP7zDMwE6u5xqGL+6WHLHoeNaHYFTBkjiBLBu4byExrhJNVtxuSoJMbwh+/c v1VOqT1EjmaVkSkwpKm9Q0qD+6+AC2gwJ9ZSuls3MUYlNG9X/fMQ0XiiVBU2zhYjOrPx kuwQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1777385542; x=1777990342; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:subject:cc:to:from:date:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=GMgaMMRHBTfcJuhrkBN4N6UBYrSouh7MkAX9cEmU3Lk=; b=Vlr0H7WbF8deR+EzlDog4ClYtvV7bXNVWHy40q6+hBJ0jCJF4xonQe8cDZEIKSq8Mx upEG/2ogYj8r0BX27Oi6xOuCllph91fcCEvPmx3S8L1F9a/R4BfJ7OejIjzv33N0yd+c sm2Jj8q9QRGuxm2lluoYx8C1kcyehTE+ePCh1RQpPleZ5afxKmAqF9Y8LaSdjBZkx+GE 8inHvDZ2wA+VmE4ZCLD8g2RvmOvW+SAxJv7NJ/55aIQ7DOHJmdDM2TcwFXN64IrYg0BG Zy85UyhurET1N7Ncu8pqtjz5EopU7P39jDo7XHnIEZpbt6Ld/slNJ0nnYr8CD93du4g6 tw2g== X-Gm-Message-State: AOJu0Yymz3nLA4+frHwu08bYw+fPgVuPOJaSzb69ZL7d8O3lKDwHegr1 T/rRFZsb8bZJgTm87jUNUhfltoXJQ9d9/40+cLDxZrLFodmdJx64qx1N60+AvpyMdB66b3pA4yo vS5TNGCrRc+HjwZ4HDKFKiXE+M3LU4QetdFfr12ilESZM5GBFKPc4DC9rJ6ZTQMEgVDJcw3QJLO hTQ6PsqNvxFRaUw7Rj4EgmkUZn8KMGS2464R/jUgzW X-Gm-Gg: AeBDietjiHTMlf1c2MdC8ZnB+bQ0OpXDpU1iOGOfQOTeRXtCmw5Y122AX2j5ZZ/zSLa nGHxctEYgXZvV9iS6c4q6s6law+k9JP5rZ7ttWLMmcUwIqbwgJuziwPkkHoSqG31OWPbrp0+GHF u44R1KCF+GEywDYaY/4xO0np+JhQ4tQEtgt3cPUgv+B84ZqgfuKh8n0Iypf91bpNiAHh3pNUK19 UBjODqj8PxC1pGDjke9mOAM2gmOV5JUTIRl3sE5UwN1z/j1LQnxfg2sDToF4mka5pUyuLimM5Gb bbEGoIkk33AKJBe5jyL/so7Q9nDbTp5hjcqVNtDjDItby8XyJStKi6SGPSN03Ioy6BVSe/pT2j3 N8mMp9LUBWptkmUIz X-Received: by 2002:a05:6820:215:b0:67e:1b8b:862c with SMTP id 006d021491bc7-6965c9115e4mr1537582eaf.0.1777385542020; Tue, 28 Apr 2026 07:12:22 -0700 (PDT) X-Received: by 2002:a05:6820:215:b0:67e:1b8b:862c with SMTP id 006d021491bc7-6965c9115e4mr1537548eaf.0.1777385541466; Tue, 28 Apr 2026 07:12:21 -0700 (PDT) Received: from imammedo ([213.175.46.86]) by smtp.gmail.com with ESMTPSA id d75a77b69052e-5100db4d0d6sm18457251cf.24.2026.04.28.07.12.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 28 Apr 2026 07:12:20 -0700 (PDT) Date: Tue, 28 Apr 2026 16:12:15 +0200 From: Igor Mammedov To: qemu-devel@nongnu.org Cc: mst@redhat.com, anisinha@redhat.com, pbonzini@redhat.com, peter.maydell@linaro.org, shannon.zhaosl@gmail.com, philmd@linaro.org, zhao1.liu@intel.com, rad@semihalf.com, leif.lindholm@oss.qualcomm.com, qemu-arm@nongnu.org Subject: Re: [PATCH v2 00/21] Introduce ACPI watchdog for Q35 and arm/virt boards Message-ID: <20260428161215.49cc1c0f@imammedo> In-Reply-To: <20260303092532.2410177-1-imammedo@redhat.com> References: <20260303092532.2410177-1-imammedo@redhat.com> X-Mailer: Claws Mail 4.3.1 (GTK 3.24.52; 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: -21 X-Spam_score: -2.2 X-Spam_bar: -- X-Spam_report: (-2.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.109, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=unavailable 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 Tue, 3 Mar 2026 10:25:11 +0100 Igor Mammedov wrote: > Changelog: > v2: > * ditch generic '-machine acpi-watchdog' option in favor of > board specific variants: > x86/q35: -machine wdat={on|off} > arm/virt: -device sbsa_gwdt,wdat={on|off} > * arm/virt: add FDT and GTDT ACPI entries for GWDT when it's present > and hide GDTD one when WDAT is enabled. > * arm/virt: add test case for GTDT > * [18-21] optional GWDT cleanup/fixes in handling WCV register update, > make QEMU behave according to spec (at least the way I read it and > it appears MS also read it that way). It fixes Windows 11 reboots when > GWDT is present (without WDAT). With that fixed it's up to MS to fix > their driver to set sane timeout as with the current one wdatchdog > will never trigger. given merge window should be open by now, gentle ping > Windows doesn't ship built-in TCO watchdog driver, and users are > forced to install vendor specific driver(s) if such exists. > However the 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/virt machine with WDAT table tailored > for it and necessary tweaks to GWDT to make usable > with WDAT driver. > * in addition to WDAT, it also adds native variant > with GWDT described in FDT and DTDT > (broken on Windows/works on linux). > > Guest OS WDAT support is present since Windows Vista and Linux since 2016[2]. > > One can test it launching VM with following options: > * x86: > -machine q35,wdat=on > * arm/virt: > -device sbsa_gwdt,wdat=on > > to trace access to TCO registers one can add to CLI: > -trace "tco_*" > to trace access to GWDT registers one can add to CLI: > -trace "sbsa_gwdt*" > > To verify that guest uses WDAT (both Windows and Linux would use it if present), > * on linux make sure that watchdog service is configured/enabled > (use wdctl to check what watchdog device is in use) and then > trigger kernel panic with command: > echo c > /proc/sysrq-trigger > * on Windows kill svchost process, running cmd in admin mode: > taskkill /f /im svchost.exe > > Tested with WS2025 & RHEL9.6 & Fedora 43 (aarch64) > > git tree at: https://gitlab.com/imammedo/qemu/-/commits/gwdt_v2 > > 1) http://msdn.microsoft.com/en-us/windows/hardware/gg463320.aspx > 2) https://lwn.net/Articles/700524/ > > PS: > previous revision: > https://patchew.org/QEMU/20260206131438.1857182-1-imammedo@redhat.com/ > > Igor Mammedov (21): > acpi: add API to build WDAT instructions > x86: q35: add 'wdat' property > x86: q35: generate WDAT ACPI table > tests: acpi: x86/q35: whitelist new WDAT table > tests: acpi: x86/q35: add WDAT table test case > tests: acpi: x86/q35: update expected WDAT blob > arm: sbsa_gwdt: fixup default "clock-frequency" > arm: add tracing events to sbsa_gwdt > arm: virt: create sbsa_gwdt watchdog > arm: sbsa_gwdt: add 'wdat' option > arm: virt: add support for WDAT based watchdog > tests: acpi: arm/virt: whitelist new WDAT table > tests: acpi: arm/virt: add WDAT table test case > tests: acpi: arm/virt: update expected WDAT blob > tests: acpi: arm/virt: whitelist GTDT table > tests: acpi: arm/virt: add GTDT watchdog table test case > tests: acpi: arm/virt: update expected GTDT blob > sbsa_gwdt: reduce code ident > sbsa_gwdt: move all foo_REFRESH logic under REFRESH condition > sbsa_gwdt: reschedule timer on direct WCV load > sbsa_gwdt: limit compare_value to INT64_MAX > > include/hw/acpi/wdat-gwdt.h | 19 ++++ > include/hw/acpi/wdat-ich9.h | 15 ++++ > include/hw/acpi/wdat.h | 118 +++++++++++++++++++++++++ > include/hw/i386/pc.h | 1 + > include/hw/watchdog/sbsa_gwdt.h | 1 + > hw/acpi/aml-build.c | 14 +++ > hw/acpi/meson.build | 5 +- > hw/acpi/wdat-gwdt-stub.c | 16 ++++ > hw/acpi/wdat-gwdt.c | 92 +++++++++++++++++++ > hw/acpi/wdat-ich9-stub.c | 15 ++++ > hw/acpi/wdat-ich9.c | 90 +++++++++++++++++++ > hw/arm/Kconfig | 1 + > hw/arm/virt-acpi-build.c | 65 +++++++++++++- > hw/arm/virt.c | 2 + > hw/core/sysbus-fdt.c | 32 +++++++ > hw/i386/acpi-build.c | 12 +++ > hw/i386/pc_q35.c | 18 ++++ > hw/watchdog/sbsa_gwdt.c | 65 +++++++++----- > hw/watchdog/trace-events | 9 ++ > tests/data/acpi/aarch64/virt/GTDT.gwdt | Bin 0 -> 132 bytes > tests/data/acpi/aarch64/virt/WDAT.wdat | Bin 0 -> 260 bytes > tests/data/acpi/x86/q35/WDAT.wdat | Bin 0 -> 308 bytes > tests/qtest/bios-tables-test.c | 54 +++++++++++ > 23 files changed, 618 insertions(+), 26 deletions(-) > create mode 100644 include/hw/acpi/wdat-gwdt.h > create mode 100644 include/hw/acpi/wdat-ich9.h > create mode 100644 include/hw/acpi/wdat.h > create mode 100644 hw/acpi/wdat-gwdt-stub.c > create mode 100644 hw/acpi/wdat-gwdt.c > create mode 100644 hw/acpi/wdat-ich9-stub.c > create mode 100644 hw/acpi/wdat-ich9.c > create mode 100644 tests/data/acpi/aarch64/virt/GTDT.gwdt > create mode 100644 tests/data/acpi/aarch64/virt/WDAT.wdat > create mode 100644 tests/data/acpi/x86/q35/WDAT.wdat >