use qemu_ram_alloc_from_ptr() to create aliased RAMBlock to the part of original memory region.
Signed-off-by: Igor Mammedov <[email protected]> --- exec.c | 7 ++++--- memory.c | 5 +++++ 2 files changed, 9 insertions(+), 3 deletions(-) diff --git a/exec.c b/exec.c index 3e78de3b8f..daef0cd54f 100644 --- a/exec.c +++ b/exec.c @@ -2313,7 +2313,7 @@ static void ram_block_add(RAMBlock *new_block, Error **errp, bool shared) new_block->used_length, DIRTY_CLIENTS_ALL); - if (new_block->host) { + if (new_block->host && !new_block->mr->alias) { qemu_ram_setup_dump(new_block->host, new_block->max_length); qemu_madvise(new_block->host, new_block->max_length, QEMU_MADV_HUGEPAGE); /* MADV_DONTFORK is also needed by KVM in absence of synchronous MMU */ @@ -2671,7 +2671,8 @@ RAMBlock *qemu_ram_block_from_host(void *ptr, bool round_offset, rcu_read_lock(); block = atomic_rcu_read(&ram_list.mru_block); - if (block && block->host && host - block->host < block->max_length) { + if (block && !block->mr->alias && block->host && + host - block->host < block->max_length) { goto found; } @@ -2680,7 +2681,7 @@ RAMBlock *qemu_ram_block_from_host(void *ptr, bool round_offset, if (block->host == NULL) { continue; } - if (host - block->host < block->max_length) { + if (!block->mr->alias && host - block->host < block->max_length) { goto found; } } diff --git a/memory.c b/memory.c index 5d8c9a9234..d710c17a26 100644 --- a/memory.c +++ b/memory.c @@ -1678,6 +1678,11 @@ void memory_region_init_alias(MemoryRegion *mr, memory_region_init(mr, owner, name, size); mr->alias = orig; mr->alias_offset = offset; + if (orig->ram_block && size) { + mr->ram_block = qemu_ram_alloc_from_ptr(size, + orig->ram_block->host + offset, + mr, &error_fatal); + } } void memory_region_init_rom_nomigrate(MemoryRegion *mr, -- 2.18.1
