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h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=cZmZu8VfwSbwtFpJZOvSNULRvtAyCT7XDIOBfHqGsio=; b=sZ8X2HavPKJNj4zbVXEQqc5xCL97vVSVdyiYlaufUynbws0LBvJxy/kppxg3WCxI9750UiFOSPhxEgpTGibJbcq20wk+g2l+VISX8szxCkk4apXTsV2NRg3fCdQd2HTwut9nfPuXukDTi6BzAlv8tUaGc+5XFEm6YrwgwN6yuJ4= X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 165.204.84.17) smtp.mailfrom=amd.com; dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=amd.com; Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; envelope-from=xen-devel-bounces@lists.xenproject.org; helo=lists.xenproject.org; Received-SPF: Pass (protection.outlook.com: domain of amd.com designates 165.204.84.17 as permitted sender) receiver=protection.outlook.com; client-ip=165.204.84.17; helo=SATLEXMB03.amd.com; pr=C From: Xenia Ragiadakou To: CC: Xenia Ragiadakou , Jan Beulich , Andrew Cooper , =?UTF-8?q?Roger=20Pau=20Monn=C3=A9?= , Wei Liu Subject: [PATCH] x86/hvm/dom0: fix PVH initrd and metadata placement Date: Thu, 26 Oct 2023 09:45:43 +0300 Message-ID: <20231026064543.43369-1-xenia.ragiadakou@amd.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS2PEPF00003441:EE_|SA0PR12MB4445:EE_ X-MS-Office365-Filtering-Correlation-Id: 7f471ce7-4b27-4e09-edd3-08dbd5ef3094 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 26 Oct 2023 06:45:49.1242 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 7f471ce7-4b27-4e09-edd3-08dbd5ef3094 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB03.amd.com] X-MS-Exchange-CrossTenant-AuthSource: DS2PEPF00003441.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA0PR12MB4445 X-ZohoMail-DKIM: pass (identity @amd.com) X-ZM-MESSAGEID: 1698302789913100001 Content-Type: text/plain; charset="utf-8" Given that start < kernel_end and end > kernel_start, the logic that determines the best placement for dom0 initrd and metadata, does not take into account the two cases below: (1) start > kernel_start && end > kernel_end (2) start < kernel_start && end < kernel_end In case (1), the evaluation will result in end =3D kernel_start i.e. end < start, and will load initrd in the middle of the kernel. In case (2), the evaluation will result in start =3D kernel_end i.e. end < start, and will load initrd at kernel_end, that is out of the memory region under evaluation. This patch rephrases the if condition to include the above two cases without affecting the behaviour for the case where start < kernel_start && end > kernel_end Fixes: 73b47eea2104 ('x86/dom0: improve PVH initrd and metadata placement') Signed-off-by: Xenia Ragiadakou --- xen/arch/x86/hvm/dom0_build.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/xen/arch/x86/hvm/dom0_build.c b/xen/arch/x86/hvm/dom0_build.c index c7d47d0d4c..5fc2c12f3a 100644 --- a/xen/arch/x86/hvm/dom0_build.c +++ b/xen/arch/x86/hvm/dom0_build.c @@ -518,7 +518,7 @@ static paddr_t __init find_memory( if ( end <=3D kernel_start || start >=3D kernel_end ) ; /* No overlap, nothing to do. */ /* Deal with the kernel already being loaded in the region. */ - else if ( kernel_start - start > end - kernel_end ) + else if ( kernel_start + kernel_end > start + end ) end =3D kernel_start; else start =3D kernel_end; --=20 2.34.1