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hw/sparse-mem: clear memory on reset 

We use sparse-mem for fuzzing. For long-running fuzzing processes, we
eventually end up with many allocated sparse-mem pages. To avoid this,
clear the allocated pages on system-reset.

Signed-off-by: Alexander Bulekov <alxndr@bu.edu>
Reviewed-by: Darren Kenny <darren.kenny@oracle.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
This commit is contained in:
Alexander Bulekov 2023-02-04 23:29:42 -05:00
parent 6dffbe36af
commit 66169c3c60
1 changed files with 12 additions and 1 deletions
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13
hw/mem/sparse-mem.c
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@ -77,6 +77,13 @@ static void sparse_mem_write(void *opaque, hwaddr addr, uint64_t v,
}
static void sparse_mem_enter_reset(Object *obj, ResetType type)
{
SparseMemState *s = SPARSE_MEM(obj);
g_hash_table_remove_all(s->mapped);
return;
}
static const MemoryRegionOps sparse_mem_ops = {
.read = sparse_mem_read,
.write = sparse_mem_write,
@ -123,7 +130,8 @@ static void sparse_mem_realize(DeviceState *dev, Error **errp)
assert(s->baseaddr + s->length > s->baseaddr);
s->mapped = g_hash_table_new(NULL, NULL);
s->mapped = g_hash_table_new_full(NULL, NULL, NULL,
(GDestroyNotify)g_free);
memory_region_init_io(&s->mmio, OBJECT(s), &sparse_mem_ops, s,
"sparse-mem", s->length);
sysbus_init_mmio(sbd, &s->mmio);
@ -131,12 +139,15 @@ static void sparse_mem_realize(DeviceState *dev, Error **errp)
static void sparse_mem_class_init(ObjectClass *klass, void *data)
{
ResettableClass *rc = RESETTABLE_CLASS(klass);
DeviceClass *dc = DEVICE_CLASS(klass);
device_class_set_props(dc, sparse_mem_properties);
dc->desc = "Sparse Memory Device";
dc->realize = sparse_mem_realize;
rc->phases.enter = sparse_mem_enter_reset;
}
static const TypeInfo sparse_mem_types[] = {