mirrors/qemu
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Revert "memory: Optimize replay of guest mapping"

Browse Source 
This reverts commit 6da2434186
("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: 6da2434186 ("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
This commit is contained in:
Peter Maydell 2023-04-04 16:37:31 -04:00
parent b5fba99ec7
commit b1ab8f9cc5
2 changed files with 3 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
hw/i386/intel_iommu.c
View File

@ -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),

4
softmmu/memory.c
View File

@ -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);