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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 20 Jan 2026 20:10:12.9853 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 723c8ece-fbeb-4e02-f8db-08de585feb8c 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: MN1PEPF0000F0E2.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS2PR12MB9637 On 2026-01-20 09:06, Roger Pau Monne wrote: > This partially reverts commit 87af633689ce16ddb166c80f32b120e50b1295de so > the current memory target for PV guests is still fetched from > start_info->nr_pages, which matches exactly what the toolstack sets the > initial memory target to. > > Using get_num_physpages() is possible on PV also, but needs adjusting to > take into account the ISA hole and the PFN at 0 not considered usable > memory depite being populated, and hence would need extra adjustments. > Instead of carrying those extra adjustments switch back to the previous > code. That leaves Linux with a difference in how current memory target is > obtained for HVM vs PV, but that's better than adding extra logic just for > PV. > > Also, for HVM the target is not (and has never been) accurately calculated, > as in that case part of what starts as guest memory is reused by hvmloader > and possibly other firmware to store ACPI tables and similar firmware > information, thus the memory is no longer being reported as RAM in the > memory map. > > Reported-by: James Dingwall > Signed-off-by: Roger Pau Monné Reviewed-by: Jason Andryuk Thanks, Jason