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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: qTGQcHKyR05APvP3SEOKZu3oZlxlA4Ho0WhStaSnnsyFqP5T4IoANePkOHy6f9ibJZrgSn3ny5eQZkZRJ3yN8m4V0JjAnrqYz3uzXe7x6hzBzzolecABTF9bQpl7Sem5KW2YrvxlyKb1gaIl7bEHo6/wJX2wcW3MvqVDndemLUvve/nBqk5K2QtYv7Yckq7utR6pSRJNZqPUbumMbmAv7X3JU6lsIEq8hbZ4SXCfpn51j8u8yPY6gddsaezbF2UsrX2wgItrFyTz1G1koPe/yJrwkL2oHNfGlhGIxeePcsXT+q6NvD8b4cDBw7hZGIDYG+Vy5NvaELdUTuwsa8Jpsyt3lA03PNRwy4zhz4n3JQk2XadNfvO4rqhuaa1+ggA83dw9E9P5uCuQvWS3tKHoXDIthhXUq6URBL7KJzpjoBoNxql3yrpVxcqPjiCtiN5e X-ExternalRecipientOutboundConnectors: 0bc7f26d-0264-416e-a6fc-8352af79c58f X-Auto-Response-Suppress: DR, OOF, AutoReply X-OriginatorOrg: virtuozzo.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 09 Oct 2026 15:13:14.1811 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 3645a68e-cc6d-4626-06cf-08df2617d6f7 X-MS-Exchange-CrossTenant-Id: 0bc7f26d-0264-416e-a6fc-8352af79c58f X-MS-Exchange-CrossTenant-AuthSource: MI3PEPF00008488.eurprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: Internet X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB9PR08MB11532 > 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/20261009-vfio= _v1-v1-0-2ae91d5b8048@virtuozzo.com?part=3D8