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charset="utf-8" From: Jagannathan Raman Allow RAM MemoryRegion to be created from an offset in a file, instead of allocating at offset of 0 by default. This is needed to synchronize RAM between QEMU & remote process. Signed-off-by: Jagannathan Raman Signed-off-by: John G Johnson Signed-off-by: Elena Ufimtseva Reviewed-by: Stefan Hajnoczi --- include/exec/memory.h | 2 ++ include/exec/ram_addr.h | 2 +- include/qemu/mmap-alloc.h | 4 +++- backends/hostmem-memfd.c | 2 +- hw/misc/ivshmem.c | 3 ++- softmmu/memory.c | 3 ++- softmmu/physmem.c | 11 +++++++---- util/mmap-alloc.c | 7 ++++--- util/oslib-posix.c | 2 +- 9 files changed, 23 insertions(+), 13 deletions(-) diff --git a/include/exec/memory.h b/include/exec/memory.h index 521d9901d7..a9d2b669e8 100644 --- a/include/exec/memory.h +++ b/include/exec/memory.h @@ -990,6 +990,7 @@ void memory_region_init_ram_from_file(MemoryRegion *mr, * @size: size of the region. * @share: %true if memory must be mmaped with the MAP_SHARED flag * @fd: the fd to mmap. + * @offset: offset within the file referenced by fd * @errp: pointer to Error*, to store an error if it happens. * * Note that this function does not do anything to cause the data in the @@ -1001,6 +1002,7 @@ void memory_region_init_ram_from_fd(MemoryRegion *mr, uint64_t size, bool share, int fd, + ram_addr_t offset, Error **errp); #endif =20 diff --git a/include/exec/ram_addr.h b/include/exec/ram_addr.h index c6d2ef1d07..d465a483c6 100644 --- a/include/exec/ram_addr.h +++ b/include/exec/ram_addr.h @@ -121,7 +121,7 @@ RAMBlock *qemu_ram_alloc_from_file(ram_addr_t size, Mem= oryRegion *mr, Error **errp); RAMBlock *qemu_ram_alloc_from_fd(ram_addr_t size, MemoryRegion *mr, uint32_t ram_flags, int fd, - Error **errp); + off_t offset, Error **errp); =20 RAMBlock *qemu_ram_alloc_from_ptr(ram_addr_t size, void *host, MemoryRegion *mr, Error **errp); diff --git a/include/qemu/mmap-alloc.h b/include/qemu/mmap-alloc.h index e786266b92..b096ffb7e9 100644 --- a/include/qemu/mmap-alloc.h +++ b/include/qemu/mmap-alloc.h @@ -16,6 +16,7 @@ size_t qemu_mempath_getpagesize(const char *mem_path); * otherwise, the alignment in use will be determined by QEMU. * @shared: map has RAM_SHARED flag. * @is_pmem: map has RAM_PMEM flag. + * @map_offset: map starts at offset of map_offset from the start of fd * * Return: * On success, return a pointer to the mapped area. @@ -25,7 +26,8 @@ void *qemu_ram_mmap(int fd, size_t size, size_t align, bool shared, - bool is_pmem); + bool is_pmem, + off_t map_offset); =20 void qemu_ram_munmap(int fd, void *ptr, size_t size); =20 diff --git a/backends/hostmem-memfd.c b/backends/hostmem-memfd.c index e5626d4330..69b0ae30bb 100644 --- a/backends/hostmem-memfd.c +++ b/backends/hostmem-memfd.c @@ -55,7 +55,7 @@ memfd_backend_memory_alloc(HostMemoryBackend *backend, Er= ror **errp) name =3D host_memory_backend_get_name(backend); memory_region_init_ram_from_fd(&backend->mr, OBJECT(backend), name, backend->size, - backend->share, fd, errp); + backend->share, fd, 0, errp); g_free(name); } =20 diff --git a/hw/misc/ivshmem.c b/hw/misc/ivshmem.c index e321e5cb69..8d3e1eedbd 100644 --- a/hw/misc/ivshmem.c +++ b/hw/misc/ivshmem.c @@ -494,7 +494,8 @@ static void process_msg_shmem(IVShmemState *s, int fd, = Error **errp) =20 /* mmap the region and map into the BAR2 */ memory_region_init_ram_from_fd(&s->server_bar2, OBJECT(s), - "ivshmem.bar2", size, true, fd, &local_= err); + "ivshmem.bar2", size, true, fd, 0, + &local_err); if (local_err) { error_propagate(errp, local_err); return; diff --git a/softmmu/memory.c b/softmmu/memory.c index 333e1ed7b0..fa65f45532 100644 --- a/softmmu/memory.c +++ b/softmmu/memory.c @@ -1609,6 +1609,7 @@ void memory_region_init_ram_from_fd(MemoryRegion *mr, uint64_t size, bool share, int fd, + ram_addr_t offset, Error **errp) { Error *err =3D NULL; @@ -1618,7 +1619,7 @@ void memory_region_init_ram_from_fd(MemoryRegion *mr, mr->destructor =3D memory_region_destructor_ram; mr->ram_block =3D qemu_ram_alloc_from_fd(size, mr, share ? RAM_SHARED : 0, - fd, &err); + fd, offset, &err); if (err) { mr->size =3D int128_zero(); object_unparent(OBJECT(mr)); diff --git a/softmmu/physmem.c b/softmmu/physmem.c index 2cd1de4a2c..4206dec857 100644 --- a/softmmu/physmem.c +++ b/softmmu/physmem.c @@ -1461,6 +1461,7 @@ static void *file_ram_alloc(RAMBlock *block, ram_addr_t memory, int fd, bool truncate, + off_t offset, Error **errp) { void *area; @@ -1511,7 +1512,8 @@ static void *file_ram_alloc(RAMBlock *block, } =20 area =3D qemu_ram_mmap(fd, memory, block->mr->align, - block->flags & RAM_SHARED, block->flags & RAM_PME= M); + block->flags & RAM_SHARED, block->flags & RAM_PME= M, + offset); if (area =3D=3D MAP_FAILED) { error_setg_errno(errp, errno, "unable to map backing store for guest RAM"); @@ -1943,7 +1945,7 @@ static void ram_block_add(RAMBlock *new_block, Error = **errp, bool shared) #ifdef CONFIG_POSIX RAMBlock *qemu_ram_alloc_from_fd(ram_addr_t size, MemoryRegion *mr, uint32_t ram_flags, int fd, - Error **errp) + off_t offset, Error **errp) { RAMBlock *new_block; Error *local_err =3D NULL; @@ -1996,7 +1998,8 @@ RAMBlock *qemu_ram_alloc_from_fd(ram_addr_t size, Mem= oryRegion *mr, new_block->used_length =3D size; new_block->max_length =3D size; new_block->flags =3D ram_flags; - new_block->host =3D file_ram_alloc(new_block, size, fd, !file_size, er= rp); + new_block->host =3D file_ram_alloc(new_block, size, fd, !file_size, of= fset, + errp); if (!new_block->host) { g_free(new_block); return NULL; @@ -2026,7 +2029,7 @@ RAMBlock *qemu_ram_alloc_from_file(ram_addr_t size, M= emoryRegion *mr, return NULL; } =20 - block =3D qemu_ram_alloc_from_fd(size, mr, ram_flags, fd, errp); + block =3D qemu_ram_alloc_from_fd(size, mr, ram_flags, fd, 0, errp); if (!block) { if (created) { unlink(mem_path); diff --git a/util/mmap-alloc.c b/util/mmap-alloc.c index 27dcccd8ec..ddffa0db4e 100644 --- a/util/mmap-alloc.c +++ b/util/mmap-alloc.c @@ -86,7 +86,8 @@ void *qemu_ram_mmap(int fd, size_t size, size_t align, bool shared, - bool is_pmem) + bool is_pmem, + off_t map_offset) { int flags; int map_sync_flags =3D 0; @@ -147,7 +148,7 @@ void *qemu_ram_mmap(int fd, offset =3D QEMU_ALIGN_UP((uintptr_t)guardptr, align) - (uintptr_t)guar= dptr; =20 ptr =3D mmap(guardptr + offset, size, PROT_READ | PROT_WRITE, - flags | map_sync_flags, fd, 0); + flags | map_sync_flags, fd, map_offset); =20 if (ptr =3D=3D MAP_FAILED && map_sync_flags) { if (errno =3D=3D ENOTSUP) { @@ -172,7 +173,7 @@ void *qemu_ram_mmap(int fd, * we will remove these flags to handle compatibility. */ ptr =3D mmap(guardptr + offset, size, PROT_READ | PROT_WRITE, - flags, fd, 0); + flags, fd, map_offset); } =20 if (ptr =3D=3D MAP_FAILED) { diff --git a/util/oslib-posix.c b/util/oslib-posix.c index f15234b5c0..93874dfc9b 100644 --- a/util/oslib-posix.c +++ b/util/oslib-posix.c @@ -227,7 +227,7 @@ void *qemu_memalign(size_t alignment, size_t size) void *qemu_anon_ram_alloc(size_t size, uint64_t *alignment, bool shared) { size_t align =3D QEMU_VMALLOC_ALIGN; - void *ptr =3D qemu_ram_mmap(-1, size, align, shared, false); + void *ptr =3D qemu_ram_mmap(-1, size, align, shared, false, 0); =20 if (ptr =3D=3D MAP_FAILED) { return NULL; --=20 2.25.GIT