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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: isaEtWECtHAlH+4ydpNZrZLqVD/XKS0AvLrXO8a8vWnC3GwiupDTfGOHA+JOS4D7rv6G/oUnZKM5zdywlaS0WEsYTE4WKk7kTO++xYlKrr3KYC0HGsI0L4op1+X9PsRlvctNYB5XP+1TQP5fFYgUjQ9uTYfOJ4h8KCUsLBZjQIFMz9O119CFKY2aFD33voa6gNth4+CUtyx41shvgYmS5zWBZIPQf/b8VICZzNZh5Rh+Xxvv9fcmCX1/X3uqQk6dlbuOze6fFmQse2ZMxcwx/DGQEGVXwtdgLc5G4yO9av3rBMov6zYkI4fKJskItlKzK7aY8+zf8l95hdZS4vuvtk1HI1kSkAqtIFpO3XDmHw1fQY0CGhX3ULvMxhPkQq1a9keOJzmy6F+AgUgt+ZE4kDVDINNnm0ahllCFKFwgQsBrralnFqTwq7/up1wc5FKl X-ExternalRecipientOutboundConnectors: 0bc7f26d-0264-416e-a6fc-8352af79c58f X-Auto-Response-Suppress: DR, OOF, AutoReply X-OriginatorOrg: virtuozzo.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 20 Oct 2026 16:40:36.7245 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 64eb4a01-cfb0-4f6f-aafd-08df2ec8de56 X-MS-Exchange-CrossTenant-Id: 0bc7f26d-0264-416e-a6fc-8352af79c58f X-MS-Exchange-CrossTenant-AuthSource: CPH1EPF00000528.eurprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: Internet X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB9PR08MB9922 > 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/20261020-vfio= _v1-v4-0-83a5668230e5@virtuozzo.com?part=3D13