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CTRY:US; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:satlexmb07.amd.com; PTR:InfoDomainNonexistent; CAT:NONE; SFS:(13230040)(82310400026)(376014)(36860700013)(1800799024)(43062017); DIR:OUT; SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 09 Dec 2025 09:38:58.4827 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 261b9426-7fc6-4274-7b5a-08de3706c741 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=[satlexmb07.amd.com] X-MS-Exchange-CrossTenant-AuthSource: SN1PEPF0002BA4F.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ5PPF4C62B9E70 Received-SPF: permerror client-ip=2a01:111:f403:c112::5; envelope-from=FangSheng.Huang@amd.com; helo=CY7PR03CU001.outbound.protection.outlook.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, 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=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: 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 Hi all, This is v4 of the SPM (Specific Purpose Memory) patch. Thank you Jonathan for the detailed review. Changes in v4 (addressing Jonathan's feedback): - Added architecture check: spm=on now reports error on non-x86 machines - Simplified return logic in e820_update_entry_type() (return true/false directly) - Changed 4GB boundary spanning from warn_report to error_report + exit - Updated QAPI documentation to be architecture-agnostic (removed E820 reference) - Removed unnecessary comments Use case: This feature allows passing EFI_MEMORY_SP (Specific Purpose Memory) from host to guest VM, useful for memory reserved for specific PCI devices (e.g., GPU memory via VFIO-PCI). The SPM memory appears as soft reserved to the guest and is managed by device drivers rather than the OS memory allocator. Example usage: -object memory-backend-ram,size=8G,id=m0 -object memory-backend-file,size=8G,id=m1,mem-path=/dev/dax0.0 -numa node,nodeid=0,memdev=m0 -numa node,nodeid=1,memdev=m1,spm=on Please review. Thanks! Best regards, Jerry Huang -- 2.34.1