As more flag parameters besides the existing 'share' are going to be added to following functions memory_region_init_ram_from_file qemu_ram_alloc_from_fd qemu_ram_alloc_from_file , let's switch them to use the 'flags' parameters so as to ease future flag additions.
The existing 'share' flag is converted to the QEMU_RAM_SHARE bit in flags, and other flag bits are ignored by above functions right now. Signed-off-by: Haozhong Zhang <haozhong.zh...@intel.com> --- backends/hostmem-file.c | 3 ++- exec.c | 7 ++++--- include/exec/memory.h | 10 ++++++++-- include/exec/ram_addr.h | 25 +++++++++++++++++++++++-- memory.c | 8 +++++--- numa.c | 2 +- 6 files changed, 43 insertions(+), 12 deletions(-) diff --git a/backends/hostmem-file.c b/backends/hostmem-file.c index 134b08d63a..30df843d90 100644 --- a/backends/hostmem-file.c +++ b/backends/hostmem-file.c @@ -58,7 +58,8 @@ file_backend_memory_alloc(HostMemoryBackend *backend, Error **errp) path = object_get_canonical_path(OBJECT(backend)); memory_region_init_ram_from_file(&backend->mr, OBJECT(backend), path, - backend->size, fb->align, backend->share, + backend->size, fb->align, + backend->share ? QEMU_RAM_SHARE : 0, fb->mem_path, errp); g_free(path); } diff --git a/exec.c b/exec.c index 5e56efefeb..16b373a86b 100644 --- a/exec.c +++ b/exec.c @@ -2000,12 +2000,13 @@ static void ram_block_add(RAMBlock *new_block, Error **errp, bool shared) #ifdef __linux__ RAMBlock *qemu_ram_alloc_from_fd(ram_addr_t size, MemoryRegion *mr, - bool share, int fd, + uint64_t flags, int fd, Error **errp) { RAMBlock *new_block; Error *local_err = NULL; int64_t file_size; + bool share = flags & QEMU_RAM_SHARE; if (xen_enabled()) { error_setg(errp, "-mem-path not supported with Xen"); @@ -2061,7 +2062,7 @@ RAMBlock *qemu_ram_alloc_from_fd(ram_addr_t size, MemoryRegion *mr, RAMBlock *qemu_ram_alloc_from_file(ram_addr_t size, MemoryRegion *mr, - bool share, const char *mem_path, + uint64_t flags, const char *mem_path, Error **errp) { int fd; @@ -2073,7 +2074,7 @@ RAMBlock *qemu_ram_alloc_from_file(ram_addr_t size, MemoryRegion *mr, return NULL; } - block = qemu_ram_alloc_from_fd(size, mr, share, fd, errp); + block = qemu_ram_alloc_from_fd(size, mr, flags, fd, errp); if (!block) { if (created) { unlink(mem_path); diff --git a/include/exec/memory.h b/include/exec/memory.h index 1b02bbd334..d87258b6ae 100644 --- a/include/exec/memory.h +++ b/include/exec/memory.h @@ -479,6 +479,9 @@ void memory_region_init_resizeable_ram(MemoryRegion *mr, void *host), Error **errp); #ifdef __linux__ + +#define QEMU_RAM_SHARE (1UL << 0) + /** * memory_region_init_ram_from_file: Initialize RAM memory region with a * mmap-ed backend. @@ -490,7 +493,10 @@ void memory_region_init_resizeable_ram(MemoryRegion *mr, * @size: size of the region. * @align: alignment of the region base address; if 0, the default alignment * (getpagesize()) will be used. - * @share: %true if memory must be mmaped with the MAP_SHARED flag + * @flags: specify properties of this memory region, which can be one or bit-or + * of following values: + * - QEMU_RAM_SHARE: memory must be mmaped with the MAP_SHARED flag + * Other bits are ignored. * @path: the path in which to allocate the RAM. * @errp: pointer to Error*, to store an error if it happens. * @@ -502,7 +508,7 @@ void memory_region_init_ram_from_file(MemoryRegion *mr, const char *name, uint64_t size, uint64_t align, - bool share, + uint64_t flags, const char *path, Error **errp); diff --git a/include/exec/ram_addr.h b/include/exec/ram_addr.h index cf2446a176..b8b01d1eb9 100644 --- a/include/exec/ram_addr.h +++ b/include/exec/ram_addr.h @@ -72,12 +72,33 @@ static inline unsigned long int ramblock_recv_bitmap_offset(void *host_addr, long qemu_getrampagesize(void); unsigned long last_ram_page(void); + +/** + * qemu_ram_alloc_from_file, + * qemu_ram_alloc_from_fd: Allocate a ram block from the specified back + * file or device + * + * Parameters: + * @size: the size in bytes of the ram block + * @mr: the memory region where the ram block is + * @flags: specify the properties of the ram block, which can be one + * or bit-or of following values + * - QEMU_RAM_SHARE: mmap the back file or device with MAP_SHARED + * Other bits are ignored. + * @mem_path or @fd: specify the back file or device + * @errp: pointer to Error*, to store an error if it happens + * + * Return: + * On success, return a pointer to the ram block. + * On failure, return NULL. + */ RAMBlock *qemu_ram_alloc_from_file(ram_addr_t size, MemoryRegion *mr, - bool share, const char *mem_path, + uint64_t flags, const char *mem_path, Error **errp); RAMBlock *qemu_ram_alloc_from_fd(ram_addr_t size, MemoryRegion *mr, - bool share, int fd, + uint64_t flags, int fd, 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, bool share, MemoryRegion *mr, diff --git a/memory.c b/memory.c index 3211fdc15f..229f64b24b 100644 --- a/memory.c +++ b/memory.c @@ -1581,7 +1581,7 @@ void memory_region_init_ram_from_file(MemoryRegion *mr, const char *name, uint64_t size, uint64_t align, - bool share, + uint64_t flags, const char *path, Error **errp) { @@ -1590,7 +1590,7 @@ void memory_region_init_ram_from_file(MemoryRegion *mr, mr->terminates = true; mr->destructor = memory_region_destructor_ram; mr->align = align; - mr->ram_block = qemu_ram_alloc_from_file(size, mr, share, path, errp); + mr->ram_block = qemu_ram_alloc_from_file(size, mr, flags, path, errp); mr->dirty_log_mask = tcg_enabled() ? (1 << DIRTY_MEMORY_CODE) : 0; } @@ -1606,7 +1606,9 @@ void memory_region_init_ram_from_fd(MemoryRegion *mr, mr->ram = true; mr->terminates = true; mr->destructor = memory_region_destructor_ram; - mr->ram_block = qemu_ram_alloc_from_fd(size, mr, share, fd, errp); + mr->ram_block = qemu_ram_alloc_from_fd(size, mr, + share ? QEMU_RAM_SHARE : 0, + fd, errp); mr->dirty_log_mask = tcg_enabled() ? (1 << DIRTY_MEMORY_CODE) : 0; } #endif diff --git a/numa.c b/numa.c index 83675a03f3..fa202a376d 100644 --- a/numa.c +++ b/numa.c @@ -456,7 +456,7 @@ static void allocate_system_memory_nonnuma(MemoryRegion *mr, Object *owner, if (mem_path) { #ifdef __linux__ Error *err = NULL; - memory_region_init_ram_from_file(mr, owner, name, ram_size, 0, false, + memory_region_init_ram_from_file(mr, owner, name, ram_size, 0, 0, mem_path, &err); if (err) { error_report_err(err); -- 2.14.1