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X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 25 Apr 2023 16:37:30.2621 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 462a19a0-f013-46a4-70e2-08db45ab5ceb X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.160];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: CY4PEPF0000B8EF.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM4PR12MB7622 On Fri, Apr 21, 2023 at 02:58:01PM -0300, Jason Gunthorpe wrote: > When the VM writes it totally-a-lie MSI address to the PCI MSI-X > registers the hypervisor traps it and subsitutes, what it valiantly > hopes, is the right address for the ITS in the VM's S1 IOMMU table > based on the ACPI where it nicely asked the guest to keep this > specific IOVA mapped. > > I'm not sure how the data bit works on ARM.. Not sure if I follow everything here correctly, yet the data seems to be the hwirq idx in its_alloc_device_irq()? So, not only the MSI in the guest is fake, the data also? Thanks Nicolin