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hostmem: Apply merge property after the memory region is initialized 

The semantic change has been introduced by commit 5becdc0ab0 ("hostmem:
simplify the code for merge and dump properties") even it clarifies that
no senmatic change has been introduced. After the commit, the merge
property can be applied even the corresponding memory region isn't
initialized yet. This leads to crash dump by the following command
lines.

  # /home/gavin/sandbox/qemu.main/build/qemu-system-aarch64  \
    -accel kvm  -machine virt -cpu host                      \
    -object memory-backend-ram,id=mem-memN0,size=4096M,merge=off
    :
    qemu-system-aarch64: ../system/memory.c:2419: memory_region_get_ram_ptr: \
    Assertion `mr->ram_block' failed.

Fix it by applying the merge property only when the memory region is
initialized.

Message-ID: <20240915233117.478169-1-gshan@redhat.com>
Fixes: 5becdc0ab0 ("hostmem: simplify the code for merge and dump properties")
Reported-by: Zhenyu Zhang <zhenyzha@redhat.com>
Tested-by: Zhenyu Zhang <zhenyzha@redhat.com>
Signed-off-by: Gavin Shan <gshan@redhat.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
This commit is contained in:
Gavin Shan 2024-09-16 09:31:17 +10:00 committed by David Hildenbrand
parent 1f5f49056d
commit 78c8f780d3
1 changed files with 1 additions and 1 deletions
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2
backends/hostmem.c
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@ -178,7 +178,7 @@ static void host_memory_backend_set_merge(Object *obj, bool value, Error **errp)
return; return;
} }
if (!host_memory_backend_mr_inited(backend) && if (host_memory_backend_mr_inited(backend) &&
value != backend->merge) { value != backend->merge) {
void *ptr = memory_region_get_ram_ptr(&backend->mr); void *ptr = memory_region_get_ram_ptr(&backend->mr);
uint64_t sz = memory_region_size(&backend->mr); uint64_t sz = memory_region_size(&backend->mr);