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intel_iommu: allow dev-iotlb context entry conditionally 

When device-iotlb is not specified, we should fail this check. A new
function vtd_ce_type_check() is introduced.

While I'm at it, clean up the vtd_dev_to_context_entry() a bit - replace
many "else if" usage into direct if check. That'll make the logic more
clear.

Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Peter Xu 2017-05-19 11:19:46 +08:00 committed by Michael S. Tsirkin
parent 5a38cb5940
commit f80c98740e
1 changed files with 36 additions and 13 deletions
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49
hw/i386/intel_iommu.c
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@ -600,6 +600,26 @@ static inline uint32_t vtd_ce_get_type(VTDContextEntry *ce)
return ce->lo & VTD_CONTEXT_ENTRY_TT;
}
/* Return true if check passed, otherwise false */
static inline bool vtd_ce_type_check(X86IOMMUState *x86_iommu,
VTDContextEntry *ce)
{
switch (vtd_ce_get_type(ce)) {
case VTD_CONTEXT_TT_MULTI_LEVEL:
/* Always supported */
break;
case VTD_CONTEXT_TT_DEV_IOTLB:
if (!x86_iommu->dt_supported) {
return false;
}
break;
default:
/* Unknwon type */
return false;
}
return true;
}
static inline uint64_t vtd_iova_limit(VTDContextEntry *ce)
{
uint32_t ce_agaw = vtd_ce_get_agaw(ce);
@ -836,6 +856,7 @@ static int vtd_dev_to_context_entry(IntelIOMMUState *s, uint8_t bus_num,
{
VTDRootEntry re;
int ret_fr;
X86IOMMUState *x86_iommu = X86_IOMMU_DEVICE(s);
ret_fr = vtd_get_root_entry(s, bus_num, &re);
if (ret_fr) {
@ -846,7 +867,9 @@ static int vtd_dev_to_context_entry(IntelIOMMUState *s, uint8_t bus_num,
/* Not error - it's okay we don't have root entry. */
trace_vtd_re_not_present(bus_num);
return -VTD_FR_ROOT_ENTRY_P;
} else if (re.rsvd || (re.val & VTD_ROOT_ENTRY_RSVD)) {
}
if (re.rsvd || (re.val & VTD_ROOT_ENTRY_RSVD)) {
trace_vtd_re_invalid(re.rsvd, re.val);
return -VTD_FR_ROOT_ENTRY_RSVD;
}
@ -860,26 +883,26 @@ static int vtd_dev_to_context_entry(IntelIOMMUState *s, uint8_t bus_num,
/* Not error - it's okay we don't have context entry. */
trace_vtd_ce_not_present(bus_num, devfn);
return -VTD_FR_CONTEXT_ENTRY_P;
} else if ((ce->hi & VTD_CONTEXT_ENTRY_RSVD_HI) ||
(ce->lo & VTD_CONTEXT_ENTRY_RSVD_LO)) {
}
if ((ce->hi & VTD_CONTEXT_ENTRY_RSVD_HI) ||
(ce->lo & VTD_CONTEXT_ENTRY_RSVD_LO)) {
trace_vtd_ce_invalid(ce->hi, ce->lo);
return -VTD_FR_CONTEXT_ENTRY_RSVD;
}
/* Check if the programming of context-entry is valid */
if (!vtd_is_level_supported(s, vtd_ce_get_level(ce))) {
trace_vtd_ce_invalid(ce->hi, ce->lo);
return -VTD_FR_CONTEXT_ENTRY_INV;
} else {
switch (vtd_ce_get_type(ce)) {
case VTD_CONTEXT_TT_MULTI_LEVEL:
/* fall through */
case VTD_CONTEXT_TT_DEV_IOTLB:
break;
default:
trace_vtd_ce_invalid(ce->hi, ce->lo);
return -VTD_FR_CONTEXT_ENTRY_INV;
}
}
/* Do translation type check */
if (!vtd_ce_type_check(x86_iommu, ce)) {
trace_vtd_ce_invalid(ce->hi, ce->lo);
return -VTD_FR_CONTEXT_ENTRY_INV;
}
return 0;
}