iommu/vt-d: Do not re-use domain-ids from the old kernel
Mark all domain-ids we find as reserved, so that there could be no collision between domains from the previous kernel and our domains in the IOMMU TLB. Tested-by: ZhenHua Li <zhen-hual@hp.com> Tested-by: Baoquan He <bhe@redhat.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
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@ -273,6 +273,11 @@ static inline void context_set_domain_id(struct context_entry *context,
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context->hi |= (value & ((1 << 16) - 1)) << 8;
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}
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static inline int context_domain_id(struct context_entry *c)
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{
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return((c->hi >> 8) & 0xffff);
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}
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static inline void context_clear_entry(struct context_entry *context)
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{
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context->lo = 0;
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@ -2802,7 +2807,7 @@ static int copy_context_table(struct intel_iommu *iommu,
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int bus, bool ext)
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{
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struct context_entry *old_ce = NULL, *new_ce = NULL, ce;
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int tbl_idx, pos = 0, idx, devfn, ret = 0;
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int tbl_idx, pos = 0, idx, devfn, ret = 0, did;
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phys_addr_t old_ce_phys;
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tbl_idx = ext ? bus * 2 : bus;
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@ -2857,6 +2862,10 @@ static int copy_context_table(struct intel_iommu *iommu,
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if (!context_present(&ce))
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continue;
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did = context_domain_id(&ce);
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if (did >= 0 && did < cap_ndoms(iommu->cap))
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set_bit(did, iommu->domain_ids);
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new_ce[idx] = ce;
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}
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