memory: add a sparse memory device for fuzzing
For testing, it can be useful to simulate an enormous amount of memory
(e.g. 2^64 RAM). This adds an MMIO device that acts as sparse memory.
When something writes a nonzero value to a sparse-mem address, we
allocate a block of memory. For now, since the only user of this device
is the fuzzer, we do not track and free zeroed blocks. The device has a
very low priority (so it can be mapped beneath actual RAM, and virtual
device MMIO regions).
Signed-off-by: Alexander Bulekov <alxndr@bu.edu>
Reviewed-by: Darren Kenny <darren.kenny@oracle.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index 0bd720a..2a925e7 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2636,6 +2636,7 @@
F: tests/qtest/fuzz/
F: tests/qtest/fuzz-*test.c
F: scripts/oss-fuzz/
+F: hw/mem/sparse-mem.c
F: docs/devel/fuzzing.rst
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