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b=kKJntqSr+NBeTGmAb0sN2Z9wLXKE54I/WJXFk/Mqy49qQMezaTsbNVVLVQrVVbucGXD/W6iDg6yMHhqCU03dEn9H/zPXaWYalCTRJJitHQeP2Aw5U/cIl0MxN3Cn41iJI8wjqnQFbB4uzcUOoeQRFvtYJfRISdrWSXtGSSbRYUs= Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=amd.com; Received: from BL4PR12MB9505.namprd12.prod.outlook.com (2603:10b6:208:591::16) by IA0PR12MB8225.namprd12.prod.outlook.com (2603:10b6:208:408::6) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.360.6; Wed, 26 Aug 2026 11:30:50 +0000 Received: from BL4PR12MB9505.namprd12.prod.outlook.com ([fe80::73aa:eb8c:a86b:5a83]) by BL4PR12MB9505.namprd12.prod.outlook.com ([fe80::73aa:eb8c:a86b:5a83%5]) with mapi id 15.21.0360.008; Wed, 26 Aug 2026 11:30:50 +0000 Message-ID: <978fb015-205b-405a-beb5-64c73e1f6d9e@amd.com> Date: Wed, 26 Aug 2026 17:00:37 +0530 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 0/2] iommu/amd: Use MAX buffer size when SNP is enabled on Family 0x19 To: Usama Arif Cc: iommu@lists.linux.dev, joro@8bytes.org, will@kernel.org, robin.murphy@arm.com, suravee.suthikulpanit@amd.com, bp@alien8.de, Joerg Roedel , samuelcrossley@gmail.com, "Srivastava, Dheeraj Kumar" References: <20260817160642.418302-1-usama.arif@linux.dev> Content-Language: en-US From: Vasant Hegde In-Reply-To: <20260817160642.418302-1-usama.arif@linux.dev> Content-Type: text/plain; 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Learn why this is important at https://aka.ms/LearnAboutSenderIdentification ] >>> >>> On Mon, 20 Apr 2026 08:42:02 +0000 Vasant Hegde wrote: >>> >>>> This series addresses CVE-2023-20585 [1] by increasing the AMD IOMMU >>>> Event log and PPR log buffer sizes to the maximum supported value (512K) >>>> on affected CPU families when SNP is enabled. >>>> >>>> Use MAX buffer size when SNP is enabled on Milan/Genoa. Impacted buffers: >>>> - Milan : Event log (PPR/GALog is not supported when SNP is enabled) >>>> - Genoa : Event and PPR log (GALog is not supported when SNP is enabled) >>>> >>> >>> Hi, >>> >>> This series seems to break kexec in our production on Milan hosts with SEV enabled. >>> This is on the 6.18.43 stable kernel backport. >> >> Do you have dmesg? We downgrade the firmware version to match the version you reported and able to reproduce this issue. But this is the CVE fix and I'd recommend you to upgrade the FW. With latest FW we don't see any issues. -Vasant