diff options
Diffstat (limited to 'softmmu')
| -rw-r--r-- | softmmu/memory.c | 27 | ||||
| -rw-r--r-- | softmmu/physmem.c | 68 | ||||
| -rw-r--r-- | softmmu/runstate.c | 2 | ||||
| -rw-r--r-- | softmmu/vl.c | 2 |
4 files changed, 57 insertions, 42 deletions
diff --git a/softmmu/memory.c b/softmmu/memory.c index c19b0be..f016151 100644 --- a/softmmu/memory.c +++ b/softmmu/memory.c @@ -1531,22 +1531,22 @@ void memory_region_init_ram_nomigrate(MemoryRegion *mr, uint64_t size, Error **errp) { - memory_region_init_ram_shared_nomigrate(mr, owner, name, size, false, errp); + memory_region_init_ram_flags_nomigrate(mr, owner, name, size, 0, errp); } -void memory_region_init_ram_shared_nomigrate(MemoryRegion *mr, - Object *owner, - const char *name, - uint64_t size, - bool share, - Error **errp) +void memory_region_init_ram_flags_nomigrate(MemoryRegion *mr, + Object *owner, + const char *name, + uint64_t size, + uint32_t ram_flags, + Error **errp) { Error *err = NULL; memory_region_init(mr, owner, name, size); mr->ram = true; mr->terminates = true; mr->destructor = memory_region_destructor_ram; - mr->ram_block = qemu_ram_alloc(size, share, mr, &err); + mr->ram_block = qemu_ram_alloc(size, ram_flags, mr, &err); if (err) { mr->size = int128_zero(); object_unparent(OBJECT(mr)); @@ -1609,7 +1609,7 @@ void memory_region_init_ram_from_fd(MemoryRegion *mr, Object *owner, const char *name, uint64_t size, - bool share, + uint32_t ram_flags, int fd, ram_addr_t offset, Error **errp) @@ -1619,9 +1619,8 @@ 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 ? RAM_SHARED : 0, - fd, offset, false, &err); + mr->ram_block = qemu_ram_alloc_from_fd(size, mr, ram_flags, fd, offset, + false, &err); if (err) { mr->size = int128_zero(); object_unparent(OBJECT(mr)); @@ -1683,7 +1682,7 @@ void memory_region_init_rom_nomigrate(MemoryRegion *mr, uint64_t size, Error **errp) { - memory_region_init_ram_shared_nomigrate(mr, owner, name, size, false, errp); + memory_region_init_ram_flags_nomigrate(mr, owner, name, size, 0, errp); mr->readonly = true; } @@ -1703,7 +1702,7 @@ void memory_region_init_rom_device_nomigrate(MemoryRegion *mr, mr->terminates = true; mr->rom_device = true; mr->destructor = memory_region_destructor_ram; - mr->ram_block = qemu_ram_alloc(size, false, mr, &err); + mr->ram_block = qemu_ram_alloc(size, 0, mr, &err); if (err) { mr->size = int128_zero(); object_unparent(OBJECT(mr)); diff --git a/softmmu/physmem.c b/softmmu/physmem.c index 1c87176..9b171c9 100644 --- a/softmmu/physmem.c +++ b/softmmu/physmem.c @@ -1540,6 +1540,7 @@ static void *file_ram_alloc(RAMBlock *block, off_t offset, Error **errp) { + uint32_t qemu_map_flags; void *area; block->page_size = qemu_fd_getpagesize(fd); @@ -1587,9 +1588,11 @@ static void *file_ram_alloc(RAMBlock *block, perror("ftruncate"); } - area = qemu_ram_mmap(fd, memory, block->mr->align, readonly, - block->flags & RAM_SHARED, block->flags & RAM_PMEM, - offset); + qemu_map_flags = readonly ? QEMU_MAP_READONLY : 0; + qemu_map_flags |= (block->flags & RAM_SHARED) ? QEMU_MAP_SHARED : 0; + qemu_map_flags |= (block->flags & RAM_PMEM) ? QEMU_MAP_SYNC : 0; + qemu_map_flags |= (block->flags & RAM_NORESERVE) ? QEMU_MAP_NORESERVE : 0; + area = qemu_ram_mmap(fd, memory, block->mr->align, qemu_map_flags, offset); if (area == MAP_FAILED) { error_setg_errno(errp, errno, "unable to map backing store for guest RAM"); @@ -1714,6 +1717,11 @@ bool qemu_ram_is_shared(RAMBlock *rb) return rb->flags & RAM_SHARED; } +bool qemu_ram_is_noreserve(RAMBlock *rb) +{ + return rb->flags & RAM_NORESERVE; +} + /* Note: Only set at the start of postcopy */ bool qemu_ram_is_uf_zeroable(RAMBlock *rb) { @@ -1946,8 +1954,10 @@ static void dirty_memory_extend(ram_addr_t old_ram_size, } } -static void ram_block_add(RAMBlock *new_block, Error **errp, bool shared) +static void ram_block_add(RAMBlock *new_block, Error **errp) { + const bool noreserve = qemu_ram_is_noreserve(new_block); + const bool shared = qemu_ram_is_shared(new_block); RAMBlock *block; RAMBlock *last_block = NULL; ram_addr_t old_ram_size, new_ram_size; @@ -1970,7 +1980,7 @@ static void ram_block_add(RAMBlock *new_block, Error **errp, bool shared) } else { new_block->host = qemu_anon_ram_alloc(new_block->max_length, &new_block->mr->align, - shared); + shared, noreserve); if (!new_block->host) { error_setg_errno(errp, errno, "cannot set up guest memory '%s'", @@ -2042,7 +2052,7 @@ RAMBlock *qemu_ram_alloc_from_fd(ram_addr_t size, MemoryRegion *mr, int64_t file_size, file_align; /* Just support these ram flags by now. */ - assert((ram_flags & ~(RAM_SHARED | RAM_PMEM)) == 0); + assert((ram_flags & ~(RAM_SHARED | RAM_PMEM | RAM_NORESERVE)) == 0); if (xen_enabled()) { error_setg(errp, "-mem-path not supported with Xen"); @@ -2084,7 +2094,7 @@ RAMBlock *qemu_ram_alloc_from_fd(ram_addr_t size, MemoryRegion *mr, return NULL; } - ram_block_add(new_block, &local_err, ram_flags & RAM_SHARED); + ram_block_add(new_block, &local_err); if (local_err) { g_free(new_block); error_propagate(errp, local_err); @@ -2127,12 +2137,17 @@ RAMBlock *qemu_ram_alloc_internal(ram_addr_t size, ram_addr_t max_size, void (*resized)(const char*, uint64_t length, void *host), - void *host, bool resizeable, bool share, + void *host, uint32_t ram_flags, MemoryRegion *mr, Error **errp) { RAMBlock *new_block; Error *local_err = NULL; + assert((ram_flags & ~(RAM_SHARED | RAM_RESIZEABLE | RAM_PREALLOC)) == 0); + assert((ram_flags & ~(RAM_SHARED | RAM_RESIZEABLE | RAM_PREALLOC | + RAM_NORESERVE)) == 0); + assert(!host ^ (ram_flags & RAM_PREALLOC)); + size = HOST_PAGE_ALIGN(size); max_size = HOST_PAGE_ALIGN(max_size); new_block = g_malloc0(sizeof(*new_block)); @@ -2144,13 +2159,8 @@ RAMBlock *qemu_ram_alloc_internal(ram_addr_t size, ram_addr_t max_size, new_block->fd = -1; new_block->page_size = qemu_real_host_page_size; new_block->host = host; - if (host) { - new_block->flags |= RAM_PREALLOC; - } - if (resizeable) { - new_block->flags |= RAM_RESIZEABLE; - } - ram_block_add(new_block, &local_err, share); + new_block->flags = ram_flags; + ram_block_add(new_block, &local_err); if (local_err) { g_free(new_block); error_propagate(errp, local_err); @@ -2162,15 +2172,15 @@ RAMBlock *qemu_ram_alloc_internal(ram_addr_t size, ram_addr_t max_size, RAMBlock *qemu_ram_alloc_from_ptr(ram_addr_t size, void *host, MemoryRegion *mr, Error **errp) { - return qemu_ram_alloc_internal(size, size, NULL, host, false, - false, mr, errp); + return qemu_ram_alloc_internal(size, size, NULL, host, RAM_PREALLOC, mr, + errp); } -RAMBlock *qemu_ram_alloc(ram_addr_t size, bool share, +RAMBlock *qemu_ram_alloc(ram_addr_t size, uint32_t ram_flags, MemoryRegion *mr, Error **errp) { - return qemu_ram_alloc_internal(size, size, NULL, NULL, false, - share, mr, errp); + assert((ram_flags & ~(RAM_SHARED | RAM_NORESERVE)) == 0); + return qemu_ram_alloc_internal(size, size, NULL, NULL, ram_flags, mr, errp); } RAMBlock *qemu_ram_alloc_resizeable(ram_addr_t size, ram_addr_t maxsz, @@ -2179,8 +2189,8 @@ RAMBlock *qemu_ram_alloc_resizeable(ram_addr_t size, ram_addr_t maxsz, void *host), MemoryRegion *mr, Error **errp) { - return qemu_ram_alloc_internal(size, maxsz, resized, NULL, true, - false, mr, errp); + return qemu_ram_alloc_internal(size, maxsz, resized, NULL, + RAM_RESIZEABLE, mr, errp); } static void reclaim_ramblock(RAMBlock *block) @@ -2239,13 +2249,14 @@ void qemu_ram_remap(ram_addr_t addr, ram_addr_t length) abort(); } else { flags = MAP_FIXED; + flags |= block->flags & RAM_SHARED ? + MAP_SHARED : MAP_PRIVATE; + flags |= block->flags & RAM_NORESERVE ? MAP_NORESERVE : 0; if (block->fd >= 0) { - flags |= (block->flags & RAM_SHARED ? - MAP_SHARED : MAP_PRIVATE); area = mmap(vaddr, length, PROT_READ | PROT_WRITE, flags, block->fd, offset); } else { - flags |= MAP_PRIVATE | MAP_ANONYMOUS; + flags |= MAP_ANONYMOUS; area = mmap(vaddr, length, PROT_READ | PROT_WRITE, flags, -1, 0); } @@ -3523,6 +3534,7 @@ int ram_block_discard_range(RAMBlock *rb, uint64_t start, size_t length) /* The logic here is messy; * madvise DONTNEED fails for hugepages * fallocate works on hugepages and shmem + * shared anonymous memory requires madvise REMOVE */ need_madvise = (rb->page_size == qemu_host_page_size); need_fallocate = rb->fd != -1; @@ -3556,7 +3568,11 @@ int ram_block_discard_range(RAMBlock *rb, uint64_t start, size_t length) * fallocate'd away). */ #if defined(CONFIG_MADVISE) - ret = madvise(host_startaddr, length, MADV_DONTNEED); + if (qemu_ram_is_shared(rb) && rb->fd < 0) { + ret = madvise(host_startaddr, length, QEMU_MADV_REMOVE); + } else { + ret = madvise(host_startaddr, length, QEMU_MADV_DONTNEED); + } if (ret) { ret = -errno; error_report("ram_block_discard_range: Failed to discard range " diff --git a/softmmu/runstate.c b/softmmu/runstate.c index 1564057..10d9b73 100644 --- a/softmmu/runstate.c +++ b/softmmu/runstate.c @@ -747,7 +747,7 @@ static void qemu_run_exit_notifiers(void) void qemu_init_subsystems(void) { - Error *err; + Error *err = NULL; os_set_line_buffering(); diff --git a/softmmu/vl.c b/softmmu/vl.c index 326c1e9..feb4d20 100644 --- a/softmmu/vl.c +++ b/softmmu/vl.c @@ -2522,7 +2522,7 @@ static void qemu_process_help_options(void) static void qemu_maybe_daemonize(const char *pid_file) { - Error *err; + Error *err = NULL; os_daemonize(); rcu_disable_atfork(); |