From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mta0.migadu.com (out-96.mta0.migadu.com [91.218.175.96]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 16BB7345EC0 for ; Sat, 15 Aug 2026 12:03:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=91.218.175.96 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786795409; cv=none; b=IU6mZbgMcgIb9pFF6KurYjxREWGfb7IdI42tzPAhlVZu+AAURyk5oPPUHeGfQQJue/7H4geUUlsMutdhHx9VuKhTUV5qzGY6qJEi3+QE1nCgx5R1n96AYkkRl3ZlmmvB3f1Jh6Xu7Lj1x90Vza4WlZD8i1RIRZ3EUEu/6Z3lPik= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786795409; c=relaxed/simple; bh=LYGRILV/oF9trCXsIGSs2jsbXo2JEiK39Pyy+rnrfoI=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=YSBYWIJiPZbFvp6xII4nGhMR638WdhbbKQg9M7IOIvoS1lTCcYRXY1XNV6ynfNJBQF4bvkqVN7pt0Gab2fZMy8UFHk6G1VbLMpG7G7JYPsOphXgAUs3FbYNcdvF+0aLRSLgkWn5u3R3QrK9w4Uvsr3JlgESBFcI/Egr9/KN0MMY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=Z/xHP5yq; arc=none smtp.client-ip=91.218.175.96 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="Z/xHP5yq" X-Envelope-To: patches@lists.linux.dev DKIM-Signature: a=rsa-sha256; bh=LYGRILV/oF9trCXsIGSs2jsbXo2JEiK39Pyy+rnrfoI=; c=simple/simple; d=linux.dev; h=from:to:subject:date:message-id:mime-version:content-type; s=key1; t=1786795406; v=1; x=1787400206; b=Z/xHP5yqXmLMRCFuKAHh35Ur3s161UWbOO3NIS3aNIwSMfDS0x80o4x+JYkTLj5CZJ3zUlOZ n48mR+FX2CF6vs5rB8hVe15r1RVHPZnfQbH3RfFzUgrbrwVPX86D85tl6qX4KskQzPUu9vil1I1 7LEt7mpa5JSKsBSC6xaLPKBc= X-Envelope-To: patches@lists.linux.dev Received: from [IPV6:2a02:6b6f:e75b:1900:855:edd6:ce7b:4965] (2a02:6b6f:e75b:1900:855:edd6:ce7b:4965) by smtp.migadu.com with ESMTPS id 214e31bdbe017913; Sat, 15 Aug 2026 12:03:26 +0000 X-Migadu-Flow: FLOW_OUT Message-ID: <0a97021b-7fdf-4e29-b59d-d9fe07c6c409@linux.dev> Date: Sat, 15 Aug 2026 13:03:25 +0100 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 6.18 0019/1611] iommu/amd: Use maximum PPR log buffer size when SNP is enabled on Family 0x19 To: Sasha Levin , Greg Kroah-Hartman Cc: stable@vger.kernel.org, patches@lists.linux.dev, Borislav Petkov , Suravee Suthikulpanit , Joerg Roedel , Vasant Hegde , Dheeraj Kumar Srivastava , samuelcrossley@gmail.com References: <20260813132447.3396830-1-usama.arif@linux.dev> <20260814193000.12@kernel.org> Content-Language: en-US From: Usama Arif In-Reply-To: <20260814193000.12@kernel.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 15/08/2026 03:33, Sasha Levin wrote: >> I have raised this in [1] but also raising it here, this series seems to break >> kexec on Milan hosts. >> >> kexec starts working on SNP hosts once we do: >> Revert "iommu/amd: Use maximum PPR log buffer size when SNP is enabled on Family 0x19" >> Revert "iommu/amd: Use maximum Event log buffer size when SNP is enabled on Family 0x19" >> >> on top 6.18.43 release. > > Does the kexec hang also reproduce on v7.1.y, or on mainline? That would tell > us whether this is the code itself rather than anything specific to the 6.18 > backport, and it decides whether a stable-side revert is the right remedy at > all. > I tested on mainline, thats broken as well. We are deploying 6.18 in the fleet and we caught it that way.