Revert "memory: Optimize replay of guest mapping"

This reverts commit 6da24341866fa940fd7d575788a2319514941c77
("memory: Optimize replay of guest mapping").

This change breaks the mps3-an547 board under TCG (and
probably other TCG boards using an IOMMU), which now
assert:

$ ./build/x86/qemu-system-arm --machine mps3-an547 -serial stdio
-kernel /tmp/an547-mwe/build/test.elf
qemu-system-arm: ../../softmmu/memory.c:1903:
memory_region_register_iommu_notifier: Assertion `n->end <=
memory_region_size(mr)' failed.

This is because tcg_register_iommu_notifier() registers
an IOMMU notifier which covers the entire address space,
so the assertion added in this commit is not correct.

For the 8.0 release, just revert this commit as it is
only an optimization.

Fixes: 6da24341866f ("memory: Optimize replay of guest mapping")
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-id: 917c1c552b2d1b732f9a86c6a90684c3a5e4cada.1680640587.git.mst@redhat.com

diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
index faade7def8672f38faf2045e885a2b9dc9481c94..a62896759c78f84147bc3b1fd71cf0756b816a4a 100644 (file)
--- a/hw/i386/intel_iommu.c
+++ b/hw/i386/intel_iommu.c
@@ -3850,7 +3850,7 @@ 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, n->start, n->end, &info, vtd_as->pasid);
+            vtd_page_walk(s, &ce, 0, ~0ULL, &info, vtd_as->pasid);
         }
     } else {
         trace_vtd_replay_ce_invalid(bus_n, PCI_SLOT(vtd_as->devfn),

diff --git a/softmmu/memory.c b/softmmu/memory.c
index 5305aca7ca3d8b9c06d4e13f6b1889a947f39641..b1a6cae6f58370015253d894b96b92788cad1c29 100644 (file)
--- a/softmmu/memory.c
+++ b/softmmu/memory.c
@@ -1900,7 +1900,6 @@ 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));
 
@@ -1924,6 +1923,7 @@ 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 = n->start; addr < n->end; addr += granularity) {
+    for (addr = 0; addr < memory_region_size(mr); addr += granularity) {
         iotlb = imrc->translate(iommu_mr, addr, IOMMU_NONE, n->iommu_idx);
         if (iotlb.perm != IOMMU_NONE) {
             n->notify(n, &iotlb);