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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: ipP9WpnNjx7ZdAiMtL5ijru66kGw1fzUSlQaIRmvl9paAPFdjNT7LsUYkwYZBCrlk4Fb9EYhuUuwkfcyKCufYQWAuprmoBLDhvjrrvhwErixFFkq84o+Q9epOez00kxNyA13O6PYpfoLwcg5AV2Y0sA+74ww9jZhwzUYOe96C4bidAPsTbdqj0DoOcgvofl4nFHG7+I2BIGHd7DIXEvtt8A70rk3na7tyhbWcDmXg1l4but8zUDC0L6FRwXeVDyLINmVK5fr0B2S2hVv7q9WIm0v+YFO4SI+vhWzFkIbTUjn/HfoowxiW+o73P7sG3uNk3F2WyRr9XLGZJddBzZjr66j1oo/0x9t3n+haAyFH6//+PEQFOl2zTo7TKi5MycB9BqrpKbcJOAJ0FB07srC7OUS2OjgbKHUJXYXpnhRt0vMHato1xPtCG8AFNviYpU4 X-ExternalRecipientOutboundConnectors: 0bc7f26d-0264-416e-a6fc-8352af79c58f X-OriginatorOrg: virtuozzo.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 30 Oct 2026 14:55:47.4011 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 981909d9-9906-4eb8-d12b-08df3695e1b9 X-MS-Exchange-CrossTenant-Id: 0bc7f26d-0264-416e-a6fc-8352af79c58f X-MS-Exchange-CrossTenant-AuthSource: MAD0EPF000008B6.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: Internet X-MS-Exchange-Transport-CrossTenantHeadersStamped: DU0PR08MB8187 > 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/20261030-vfio= _v1-v6-0-45de246bc92e@virtuozzo.com?part=3D15