* Igor Mammedov (imamm...@redhat.com) wrote:
> use qemu_ram_alloc_from_ptr() to create aliased RAMBlock
> to the part of original memory region.
>
> Signed-off-by: Igor Mammedov <imamm...@redhat.com>
> ---
> 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);
> + }
> }
Doesn't this cause new memory regions to be created in other existing
machines, e.g. x86's mem-smram, or the various PCI vga hacks?
Dave
>
> void memory_region_init_rom_nomigrate(MemoryRegion *mr,
> --
> 2.18.1
>
--
Dr. David Alan Gilbert / dgilb...@redhat.com / Manchester, UK
