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Do not create RMRR entries for identity-mapped domains.

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It does not make sense since identity mapping already provides the
required mapping for RMRR ranges.  More, since identity page tables do
not reflect content of map entries for id domains, creating RMRR
entries makes domain data inconsistent.

Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
This commit is contained in:
kib 2017-03-25 10:45:16 +00:00
parent f923ae8090
commit f08304b44f
1 changed files with 7 additions and 5 deletions
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2
sys/x86/iommu/intel_ctx.c
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@ -433,12 +433,14 @@ dmar_get_ctx_for_dev(struct dmar_unit *dmar, device_t dev, uint16_t rid,
TD_PINNED_ASSERT;
return (NULL);
}
if (!id_mapped) {
error = domain_init_rmrr(domain1, dev);
if (error != 0) {
dmar_domain_destroy(domain1);
TD_PINNED_ASSERT;
return (NULL);
}
}
ctx1 = dmar_ctx_alloc(domain1, rid);
ctxp = dmar_map_ctx_entry(ctx1, &sf);
DMAR_LOCK(dmar);