From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from linux.microsoft.com (linux.microsoft.com [13.77.154.182]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 571FA3EF67D; Thu, 15 Oct 2026 09:10:10 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=13.77.154.182 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792055411; cv=none; b=DSjpvJuYSudmZVtrKV6cQnhXFgf3MO85lLP9wlnKc2g7eupZFnM9gTQE88nGO4xX1DHGnMRon3VZPcdTclD6Xp+NS7l4POwg/Gt8ftrfLmvpi4CDaRnnSUYKblKLhymmPUKtWxL91mnuwklF12iajspX1QpP4X0p/Pangdkoce8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792055411; c=relaxed/simple; bh=qbPT3vKmnaI+U1z729U2LoQwg0qtNLYje1pulpSivYk=; h=Message-ID:Date:MIME-Version:Subject:From:To:Cc:References: In-Reply-To:Content-Type; b=KHWFS9SHG+tjH1cgGqKVQK24lKCqjUxRyW8KNncSXm9tagqE5W2kzSyP2wLrQ9qvcIWr9wyowpYNxH87d5nEE0sLe3SKPUYKlj+n3pvkyy8YKdbWQm4rRVSFU3Utu4MGoDTIUNRjFeMVHovnkp9IREbOEisEjk6mgnEQ2RNfbYg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.microsoft.com; spf=pass smtp.mailfrom=linux.microsoft.com; dkim=pass (1024-bit key) header.d=linux.microsoft.com header.i=@linux.microsoft.com header.b=AawnaJ4I; arc=none smtp.client-ip=13.77.154.182 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.microsoft.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.microsoft.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.microsoft.com header.i=@linux.microsoft.com header.b="AawnaJ4I" Received: from [10.95.64.106] (unknown [4.194.122.162]) by linux.microsoft.com (Postfix) with ESMTPSA id A639120B7166; Thu, 15 Oct 2026 02:09:55 -0700 (PDT) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com A639120B7166 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1792055405; bh=7ZvitbVIHx4genvaOzk0rR3WfZKmeRXiVirIb0psHlU=; h=Date:Subject:From:To:Cc:References:In-Reply-To:From; b=AawnaJ4IjGtG8X+AJ0H3qpVpiCtWFQzQCs1HCf9BkxyP8vQoU5D8ierMAr/05YWuk ZmRmSvdbWN5PhkJKuaOwrqbcg8zbip9lpbbtlozuc/pPhzG7wGDJHuJfWtye+UYMsU uL2XH18rxyBhHi4I4D4G1bSERbRGZ6U5fRCGjyOc= Message-ID: Date: Thu, 15 Oct 2026 14:39:57 +0530 Precedence: bulk X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v6 0/4] x86/irq: Fix lost interrupts on CPU hot-unplug From: Naman Jain To: Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H . Peter Anvin" , Wei Liu , "K . Y . Srinivasan" , Haiyang Zhang , Dexuan Cui , Michael Kelley Cc: Long Li , Nam Cao , Joerg Roedel , Suravee Suthikulpanit , Vasant Hegde , Will Deacon , Robin Murphy , Lorenzo Pieralisi , =?UTF-8?Q?Krzysztof_Wilczy=C5=84ski?= , Manivannan Sadhasivam , Rob Herring , Bjorn Helgaas , Kees Cook , "Rafael J . Wysocki" , Radu Rendec , Sean Christopherson , Kai Huang , Dmitry Ilvokhin , Shradha Gupta , Christophe JAILLET , Thierry Reding , Jiri Wiesner , Daniel J Blueman , linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, iommu@lists.linux.dev, linux-pci@vger.kernel.org References: <20260923043023.3150498-1-namjain@linux.microsoft.com> Content-Language: en-US In-Reply-To: <20260923043023.3150498-1-namjain@linux.microsoft.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 9/23/2026 10:00 AM, Naman Jain wrote: > On CPU hot-unplug, fixup_irqs() re-injects interrupts that are still > pending in the outgoing CPU's IRR via the irqchip's irq_retrigger() > callback. The Hyper-V root partition PCI/MSI irqchip lost that callback > when it was converted to msi_create_parent_irq_domain(), so such a > pending interrupt is silently dropped, leading to lost interrupts, stalls > and "No irq handler for vector" messages. > > Patch 1 is the minimal, backportable fix (Fixes:/Cc: stable) that restores > irq_chip_retrigger_hierarchy() on the Hyper-V root partition PCI/MSI chip. > The equivalent guest pci-hyperv.c fix from the previous version is already > merged, so it is dropped here. > > Patch 2 then switches fixup_irqs() to call irq_chip_retrigger_hierarchy() > directly which ensures that this issue does not occur for chips that > miss adding this initialization. > > Patch 3 makes a similar change in msi_set_affinity() > > Patch 4 then drops the now-redundant irq_retrigger() initializations. > This way, patch 2-4 do not need to be backported. > Hi Thomas, maintainers, Gentle ping on this patch series. Please let me know if this is good to be picked in next merge cycle or if any changes are needed from my side. Regards, Naman