[Bug 273022] MSI/MSI-X assignment fails if APIC ID > 255
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Date: Wed, 09 Aug 2023 03:43:34 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=273022 Bug ID: 273022 Summary: MSI/MSI-X assignment fails if APIC ID > 255 Product: Base System Version: CURRENT Hardware: Any OS: Any Status: New Severity: Affects Only Me Priority: --- Component: kern Assignee: bugs@FreeBSD.org Reporter: emaste@freebsd.org APIC address is calculated as: #define INTEL_ADDR(msi) \ (MSI_INTEL_ADDR_BASE | (msi)->msi_cpu << 12 | \ MSI_INTEL_ADDR_RH_OFF | MSI_INTEL_ADDR_DM_PHYSICAL) See Intel SDM 11.11.1 Message Address Register Format bits 19-12 are: Destination ID — This field contains an 8-bit destination ID. It identifies the message’s target processor(s). The destination ID corresponds to bits 63:56 of the I/O APIC Redirection Table Entry if the IOAPIC is used to dispatch the interrupt to the processor(s). if msi_cpu > 255 then (msi)->msi_cpu << 12 will overflow into bits 31-20 which need to contain 0xfee -- You are receiving this mail because: You are the assignee for the bug.