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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: fi6xtsePzA6dWxPe5yzmfrTYjwNua0XiBM18YMUX7byvegDgHvhfcaWhhSDYsgO+DSuH+iyiUR3fgkvOh7O/Zj5n3B3XchSwiR+Y5u94VjvX4c9gKJbQipTmIo4c7DvEbbIeE4DcusrO+MpWXHlBVGpHS+JmJT/JAkdQny30F5M6Axz9RCRtlyupnzm2hw3uj1qyB5WTGrIHAzu6vWxe+Jh9grI44ns/t2ZySLDfHInAQ3VWlvJAtJpesJskBclsplcttk7ByjBb94IaS+Qyin1dUy/jo/CgcJ7qOzXki7whZLFObGUJtRKpdxQtMD4hDNawro86XBfzSFLxBb8KAHhCBfh2huYOCAlQPUBrZeiNud5CpCy4pdQYsxkXmm36TlL1O2RGF+sdYSOz2jsV+UeccvMTYRUqM/bh1/EWI2ffZ3iPp4KNcaAUOkVmcES8 X-ExternalRecipientOutboundConnectors: 0bc7f26d-0264-416e-a6fc-8352af79c58f X-Auto-Response-Suppress: DR, OOF, AutoReply X-OriginatorOrg: virtuozzo.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 03 Nov 2026 14:08:09.3098 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: b24c24ab-12bb-42cc-8c17-08df39b3e3f8 X-MS-Exchange-CrossTenant-Id: 0bc7f26d-0264-416e-a6fc-8352af79c58f X-MS-Exchange-CrossTenant-AuthSource: ZR1PEPF0000E45F.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: Internet X-MS-Exchange-Transport-CrossTenantHeadersStamped: VI0PR08MB11133 > 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/20261103-vfio= _v1-v7-0-4467fdccbbe6@virtuozzo.com?part=3D16