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mem: add share parameter to memory-backend-ram

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Currently only file backed memory backend can
be created with a "share" flag in order to allow
sharing guest RAM with other processes in the host.

Add the "share" flag also to RAM Memory Backend
in order to allow remapping parts of the guest RAM
to different host virtual addresses. This is needed
by the RDMA devices in order to remap non-contiguous
QEMU virtual addresses to a contiguous virtual address range.

Moved the "share" flag to the Host Memory base class,
modified phys_mem_alloc to include the new parameter
and a new interface memory_region_init_ram_shared_nomigrate.

There are no functional changes if the new flag is not used.

Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Marcel Apfelbaum <marcel@redhat.com>
This commit is contained in:
Marcel Apfelbaum 2017-12-13 16:37:37 +02:00
parent e5ecc287a7
commit 06329ccecf
14 changed files with 94 additions and 50 deletions
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23
include/exec/memory.h
View file

@ -435,6 +435,29 @@ void memory_region_init_ram_nomigrate(MemoryRegion *mr,
uint64_t size,
Error **errp);
/**
* memory_region_init_ram_shared_nomigrate: Initialize RAM memory region.
* Accesses into the region will
* modify memory directly.
*
* @mr: the #MemoryRegion to be initialized.
* @owner: the object that tracks the region's reference count
* @name: Region name, becomes part of RAMBlock name used in migration stream
* must be unique within any device
* @size: size of the region.
* @share: allow remapping RAM to different addresses
* @errp: pointer to Error*, to store an error if it happens.
*
* Note that this function is similar to memory_region_init_ram_nomigrate.
* The only difference is part of the RAM region can be remapped.
*/
void memory_region_init_ram_shared_nomigrate(MemoryRegion *mr,
struct Object *owner,
const char *name,
uint64_t size,
bool share,
Error **errp);
/**
* memory_region_init_resizeable_ram: Initialize memory region with resizeable
* RAM. Accesses into the region will

3
include/exec/ram_addr.h
View file

@ -80,7 +80,8 @@ RAMBlock *qemu_ram_alloc_from_fd(ram_addr_t size, MemoryRegion *mr,
Error **errp);
RAMBlock *qemu_ram_alloc_from_ptr(ram_addr_t size, void *host,
MemoryRegion *mr, Error **errp);
RAMBlock *qemu_ram_alloc(ram_addr_t size, MemoryRegion *mr, Error **errp);
RAMBlock *qemu_ram_alloc(ram_addr_t size, bool share, MemoryRegion *mr,
Error **errp);
RAMBlock *qemu_ram_alloc_resizeable(ram_addr_t size, ram_addr_t max_size,
void (*resized)(const char*,
uint64_t length,