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iommu/vt-d: Do not re-use domain-ids from the old kernel

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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>
This commit is contained in:
Joerg Roedel 2015-06-12 12:02:09 +02:00
parent 091d42e43d
commit dbcd861f25
1 changed files with 10 additions and 1 deletions
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11
drivers/iommu/intel-iommu.c
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@ -273,6 +273,11 @@ static inline void context_set_domain_id(struct context_entry *context,
context->hi |= (value & ((1 << 16) - 1)) << 8;
}
static inline int context_domain_id(struct context_entry *c)
{
return((c->hi >> 8) & 0xffff);
}
static inline void context_clear_entry(struct context_entry *context)
{
context->lo = 0;
@ -2802,7 +2807,7 @@ static int copy_context_table(struct intel_iommu *iommu,
int bus, bool ext)
{
struct context_entry *old_ce = NULL, *new_ce = NULL, ce;
int tbl_idx, pos = 0, idx, devfn, ret = 0;
int tbl_idx, pos = 0, idx, devfn, ret = 0, did;
phys_addr_t old_ce_phys;
tbl_idx = ext ? bus * 2 : bus;
@ -2857,6 +2862,10 @@ static int copy_context_table(struct intel_iommu *iommu,
if (!context_present(&ce))
continue;
did = context_domain_id(&ce);
if (did >= 0 && did < cap_ndoms(iommu->cap))
set_bit(did, iommu->domain_ids);
new_ce[idx] = ce;
}