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Date:      Sun, 22 Feb 2026 14:44:59 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 288122] msi_map: unsupported destination APIC ID 257
Message-ID:  <bug-288122-227-zzjElvb1F4@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-288122-227@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=288122

--- Comment #17 from dwmw2@infradead.org ---
There's mojibake in the patch cherry picked from Xen.

And is the change to MSI composition sufficient to make the I/O APIC work too?
In an ideal design it should be as the I/O APIC RTE is just a bit-shuffled
version of the MSI address/data bits, so you can compose the "upstream" MSI
message according to the IOMMU or direct 8-bit or 15-bit mode, and have no
special cases in your I/O APIC driver for those modes; just shift the bits
around.

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