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memory: Optimize replay of guest mapping

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On x86, there are two notifiers registered due to vtd-ir memory region
splitting the whole address space. During replay of the address space
for each notifier, the whole address space is scanned which is
unnecessory.

We only need to scan the space belong to notifier montiored space.

Assert when notifier is used to monitor beyond iommu memory region's
address space.

Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Message-Id: <20230215065238.713041-1-zhenzhong.duan@intel.com>
Acked-by: Peter Xu <peterx@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.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 2023-02-15 14:52:38 +08:00 committed by Michael S. Tsirkin
parent b8a7f51f59
commit 6da2434186
2 changed files with 3 additions and 3 deletions
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2
hw/i386/intel_iommu.c
View file

@ -3831,7 +3831,7 @@ static void vtd_iommu_replay(IOMMUMemoryRegion *iommu_mr, IOMMUNotifier *n)
.domain_id = vtd_get_domain_id(s, &ce, vtd_as->pasid),
};
vtd_page_walk(s, &ce, 0, ~0ULL, &info, vtd_as->pasid);
vtd_page_walk(s, &ce, n->start, n->end, &info, vtd_as->pasid);
}
} else {
trace_vtd_replay_ce_invalid(bus_n, PCI_SLOT(vtd_as->devfn),

4
softmmu/memory.c
View file

@ -1900,6 +1900,7 @@ int memory_region_register_iommu_notifier(MemoryRegion *mr,
iommu_mr = IOMMU_MEMORY_REGION(mr);
assert(n->notifier_flags != IOMMU_NOTIFIER_NONE);
assert(n->start <= n->end);
assert(n->end <= memory_region_size(mr));
assert(n->iommu_idx >= 0 &&
n->iommu_idx < memory_region_iommu_num_indexes(iommu_mr));
@ -1923,7 +1924,6 @@ uint64_t memory_region_iommu_get_min_page_size(IOMMUMemoryRegion *iommu_mr)
void memory_region_iommu_replay(IOMMUMemoryRegion *iommu_mr, IOMMUNotifier *n)
{
MemoryRegion *mr = MEMORY_REGION(iommu_mr);
IOMMUMemoryRegionClass *imrc = IOMMU_MEMORY_REGION_GET_CLASS(iommu_mr);
hwaddr addr, granularity;
IOMMUTLBEntry iotlb;
@ -1936,7 +1936,7 @@ void memory_region_iommu_replay(IOMMUMemoryRegion *iommu_mr, IOMMUNotifier *n)
granularity = memory_region_iommu_get_min_page_size(iommu_mr);
for (addr = 0; addr < memory_region_size(mr); addr += granularity) {
for (addr = n->start; addr < n->end; addr += granularity) {
iotlb = imrc->translate(iommu_mr, addr, IOMMU_NONE, n->iommu_idx);
if (iotlb.perm != IOMMU_NONE) {
n->notify(n, &iotlb);