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intel_iommu: Flush stage-1 cache in iotlb invalidation

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According to spec, Page-Selective-within-Domain Invalidation (11b):

1. IOTLB entries caching second-stage mappings (PGTT=010b) or pass-through
(PGTT=100b) mappings associated with the specified domain-id and the
input-address range are invalidated.
2. IOTLB entries caching first-stage (PGTT=001b) or nested (PGTT=011b)
mapping associated with specified domain-id are invalidated.

So per spec definition the Page-Selective-within-Domain Invalidation
needs to flush first stage and nested cached IOTLB entries as well.

We don't support nested yet and pass-through mapping is never cached,
so what in iotlb cache are only first-stage and second-stage mappings.

Add a tag pgtt in VTDIOTLBEntry to mark PGTT type of the mapping and
invalidate entries based on PGTT type.

Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Reviewed-by: Clément Mathieu--Drif<clement.mathieu--drif@eviden.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Yi Liu <yi.l.liu@intel.com>
Message-Id: <20241212083757.605022-11-zhenzhong.duan@intel.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Zhenzhong Duan 2024-12-12 16:37:47 +08:00 committed by Michael S. Tsirkin
parent 65c4f09999
commit 16d4e418e9
2 changed files with 22 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

27
hw/i386/intel_iommu.c
View File

@ -305,9 +305,21 @@ static gboolean vtd_hash_remove_by_page(gpointer key, gpointer value,
VTDIOTLBPageInvInfo *info = (VTDIOTLBPageInvInfo *)user_data;
uint64_t gfn = (info->addr >> VTD_PAGE_SHIFT_4K) & info->mask;
uint64_t gfn_tlb = (info->addr & entry->mask) >> VTD_PAGE_SHIFT_4K;
return (entry->domain_id == info->domain_id) &&
(((entry->gfn & info->mask) == gfn) ||
(entry->gfn == gfn_tlb));
if (entry->domain_id != info->domain_id) {
return false;
}
/*
* According to spec, IOTLB entries caching first-stage (PGTT=001b) or
* nested (PGTT=011b) mapping associated with specified domain-id are
* invalidated. Nested isn't supported yet, so only need to check 001b.
*/
if (entry->pgtt == VTD_SM_PASID_ENTRY_FLT) {
return true;
}
return (entry->gfn & info->mask) == gfn || entry->gfn == gfn_tlb;
}
/* Reset all the gen of VTDAddressSpace to zero and set the gen of
@ -382,7 +394,7 @@ out:
static void vtd_update_iotlb(IntelIOMMUState *s, uint16_t source_id,
uint16_t domain_id, hwaddr addr, uint64_t pte,
uint8_t access_flags, uint32_t level,
uint32_t pasid)
uint32_t pasid, uint8_t pgtt)
{
VTDIOTLBEntry *entry = g_malloc(sizeof(*entry));
struct vtd_iotlb_key *key = g_malloc(sizeof(*key));
@ -400,6 +412,7 @@ static void vtd_update_iotlb(IntelIOMMUState *s, uint16_t source_id,
entry->access_flags = access_flags;
entry->mask = vtd_pt_level_page_mask(level);
entry->pasid = pasid;
entry->pgtt = pgtt;
key->gfn = gfn;
key->sid = source_id;
@ -2062,7 +2075,7 @@ static bool vtd_do_iommu_translate(VTDAddressSpace *vtd_as, PCIBus *bus,
bool is_fpd_set = false;
bool reads = true;
bool writes = true;
uint8_t access_flags;
uint8_t access_flags, pgtt;
bool rid2pasid = (pasid == PCI_NO_PASID) && s->root_scalable;
VTDIOTLBEntry *iotlb_entry;
uint64_t xlat, size;
@ -2171,9 +2184,11 @@ static bool vtd_do_iommu_translate(VTDAddressSpace *vtd_as, PCIBus *bus,
if (s->flts && s->root_scalable) {
ret_fr = vtd_iova_to_flpte(s, &ce, addr, is_write, &pte, &level,
&reads, &writes, s->aw_bits, pasid);
pgtt = VTD_SM_PASID_ENTRY_FLT;
} else {
ret_fr = vtd_iova_to_slpte(s, &ce, addr, is_write, &pte, &level,
&reads, &writes, s->aw_bits, pasid);
pgtt = VTD_SM_PASID_ENTRY_SLT;
}
if (!ret_fr) {
xlat = vtd_get_pte_addr(pte, s->aw_bits);
@ -2207,7 +2222,7 @@ static bool vtd_do_iommu_translate(VTDAddressSpace *vtd_as, PCIBus *bus,
page_mask = vtd_pt_level_page_mask(level);
access_flags = IOMMU_ACCESS_FLAG(reads, writes);
vtd_update_iotlb(s, source_id, vtd_get_domain_id(s, &ce, pasid),
addr, pte, access_flags, level, pasid);
addr, pte, access_flags, level, pasid, pgtt);
out:
vtd_iommu_unlock(s);
entry->iova = addr & page_mask;

1
include/hw/i386/intel_iommu.h
View File

@ -155,6 +155,7 @@ struct VTDIOTLBEntry {
uint64_t pte;
uint64_t mask;
uint8_t access_flags;
uint8_t pgtt;
};
/* VT-d Source-ID Qualifier types */