hw/i386/intel_iommu: Fix trivial endianness problems

After reading the guest memory with dma_memory_read(), we have
to make sure that we byteswap the little endian data to the host's
byte order.

Signed-off-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20230802135723.178083-2-thuth@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Peter Xu <peterx@redhat.com>
(cherry picked from commit cc2a084)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

hw/i386/intel_iommu.c

@@ -755,6 +755,8 @@ static int vtd_get_pdire_from_pdir_table(dma_addr_t pasid_dir_base,
         return -VTD_FR_PASID_TABLE_INV;
     }
 
+    pdire->val = le64_to_cpu(pdire->val);
+
     return 0;
 }
 
@@ -779,6 +781,9 @@ static int vtd_get_pe_in_pasid_leaf_table(IntelIOMMUState *s,
                         pe, entry_size, MEMTXATTRS_UNSPECIFIED)) {
         return -VTD_FR_PASID_TABLE_INV;
     }
+    for (size_t i = 0; i < ARRAY_SIZE(pe->val); i++) {
+        pe->val[i] = le64_to_cpu(pe->val[i]);
+    }
 
     /* Do translation type check */
     if (!vtd_pe_type_check(x86_iommu, pe)) {