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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: jDSd0orGolHfa3ijZqQH3V2U2YPrryyGZ5O6bHXIBIEJVsj40nCmNF9rTn5mYD7VDqf1CUE6/s8yE6MF3NAd6R36IQHH9cQA8Dp/dUzzJBo/S7ZvzxwZbdtC7WaA0zwWMitGv7WqBvhl/45Ic3skkx391K+pTpycsbwGuiAtvI9DIMTu/H/WFO8GQHUhExC5uL68W/S/vdfNOmd3npLuBUopbkLDWB4CTI4PRkcCOMelJ11FyjUCN8igcGhVuv3zbSBxhmfsfPTdfAaaMdih7/TwFXbGZllImJ5DOehr4XYGbXmIOvjtlS/MEWbjZdK4EritXX8TCjPv1tkM8AvY4rbXTOBM3W+Xj1fijynkpn+TOtRaTsefEUN2uhIR59L6tUE5eDKvZfIPzsoIhJSOB5yKGZlZVxQUGybfdLAIwzLOIb/gaontH+JUsUdJMWti X-ExternalRecipientOutboundConnectors: 0bc7f26d-0264-416e-a6fc-8352af79c58f X-Auto-Response-Suppress: DR, OOF, AutoReply X-OriginatorOrg: virtuozzo.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 02 Nov 2026 10:47:20.2429 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: a13f43f5-1d8a-457c-c822-08df38ceab9d X-MS-Exchange-CrossTenant-Id: 0bc7f26d-0264-416e-a6fc-8352af79c58f X-MS-Exchange-CrossTenant-AuthSource: ZR1PEPF0000E45D.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: Internet X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB9PR08MB9537 > From: Yanfei Xu >=20 > The load procedure of VFIO PCI devices involves setting up IRT > for each VFIO PCI devices. This requires determining whether an > interrupt is single-destination interrupt to decide between > Posted Interrupt(PI) or remapping mode for the IRTE. However, > determining this may require accessing the VM's APIC registers. >=20 > For example: > ioctl(vbasedev->fd, VFIO_DEVICE_SET_IRQS, irqs) > ... > kvm_arch_irq_bypass_add_producer > kvm_x86_call(pi_update_irte) > vmx_pi_update_irte > kvm_intr_is_single_vcpu >=20 > If the LAPIC has not been loaded yet, interrupts will use remapping > mode. To prevent the fallback of interrupt mode, keep APIC is always > loaded prior to VFIO PCI devices. >=20 > andrey.drobyshev: > This commit is cherry-picked as-is, with no modifications, from the > upstream commit d943cef76090. >=20 > Signed-off-by: Yicong Shen > Signed-off-by: Yanfei Xu > Reviewed-by: Peter Xu > Link: https://lore.kernel.org/r/20250818131127.1021648-1-yanfei.xu@byteda= nce.com > Signed-off-by: Peter Xu Sashiko has reviewed this patch and found no issues. It looks great! --=20 Sashiko AI review =C2=B7 https://sashiko.vzint.dev/#/patchset/20261102-vfio= _v1-v6-0-9bc7cabc850d@virtuozzo.com?part=3D15