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msi: report error for attempt to use APIC ID > 255

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The MSI/MSI-X address includes 8 bits to encode the Destination ID.
Previously IDs over 255 overlapped with the fixed portion of the
address, resulting in an invalid value (and a nonfunctional interrupt).

Instead, print an error message and return EINVAL.  The interrupt will
still not work, but the user will have a clue as to why.

PR:		273022
Reviewed by:	jhb
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D41395
This commit is contained in:
Ed Maste 2023-08-08 19:42:09 -04:00
parent 13da84237a
commit cbf845052f
1 changed files with 5 additions and 0 deletions
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5
sys/x86/x86/msi.c
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@ -620,6 +620,11 @@ msi_map(int irq, uint64_t *addr, uint32_t *data)
mtx_unlock(&msi_lock);
error = EOPNOTSUPP;
#endif
if (error == EOPNOTSUPP && msi->msi_cpu > 0xff) {
printf("%s: unsupported destination APIC ID %u\n", __func__,
msi->msi_cpu);
error = EINVAL;
}
if (error == EOPNOTSUPP) {
*addr = INTEL_ADDR(msi);
*data = INTEL_DATA(msi);