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Hyper-V: vPCI: limit 64 cpus for msi/msix interrupt handling

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On older Hyper-V vPCI protocol version 1.1, only the first 64 cpus
are able to handle msi/msix. This is true on FreeBSD 13.x and earlier
releases. If MSI IRQ is assigned to cpu id greater than 63, it would
lead to missing interrupts. Add check in set_interrupt_apic_ids() to
only add first 64 cpus into the interrupt cpu set.

Reported by:	NetApp
Tested by:	NetApp
Reviewed by:	kib
Sponsored by:	Microsoft
Differential Revision:	https://reviews.freebsd.org/D44297
This commit is contained in:
Wei Hu 2024-03-11 10:15:09 +00:00
parent 6766a47c02
commit e4b8828947
1 changed files with 7 additions and 0 deletions
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7
sys/x86/x86/mp_x86.c
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@ -1184,6 +1184,13 @@ set_interrupt_apic_ids(void)
!hyperthreading_intr_allowed)
continue;
/*
* Currently Hyper-V only supports intr on first
* 64 cpus.
*/
if (vm_guest == VM_GUEST_HV && i > 63)
continue;
intr_add_cpu(i);
}
}