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Tue, 08 Jun 2010 19:15:52 +0000 From: Alex Williamson Subject: [RFC PATCH 2/6] ram_blocks: Convert to a QLIST To: qemu-devel@nongnu.org, anthony@codemonkey.ws Cc: kvm@vger.kernel.org, quintela@redhat.com, chrisw@redhat.com, alex.williamson@redhat.com Date: Tue, 08 Jun 2010 13:15:35 -0600 Message-ID: <20100608191535.4451.48702.stgit@localhost.localdomain> In-Reply-To: <20100608191447.4451.47795.stgit@localhost.localdomain> References: <20100608191447.4451.47795.stgit@localhost.localdomain> User-Agent: StGIT/0.14.3 MIME-Version: 1.0 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Greylist: IP, sender and recipient auto-whitelisted, not delayed by milter-greylist-4.2.3 (demeter.kernel.org [140.211.167.41]); Tue, 08 Jun 2010 19:21:48 +0000 (UTC) diff --git a/arch_init.c b/arch_init.c index 8e849a8..43e42ba 100644 --- a/arch_init.c +++ b/arch_init.c @@ -110,7 +110,7 @@ static int ram_save_block(QEMUFile *f) ram_addr_t addr = 0; int bytes_sent = 0; - while (addr < last_ram_offset) { + while (addr < ram.last_offset) { if (cpu_physical_memory_get_dirty(current_addr, MIGRATION_DIRTY_FLAG)) { uint8_t *p; @@ -133,7 +133,7 @@ static int ram_save_block(QEMUFile *f) break; } addr += TARGET_PAGE_SIZE; - current_addr = (saved_addr + addr) % last_ram_offset; + current_addr = (saved_addr + addr) % ram.last_offset; } return bytes_sent; @@ -146,7 +146,7 @@ static ram_addr_t ram_save_remaining(void) ram_addr_t addr; ram_addr_t count = 0; - for (addr = 0; addr < last_ram_offset; addr += TARGET_PAGE_SIZE) { + for (addr = 0; addr < ram.last_offset; addr += TARGET_PAGE_SIZE) { if (cpu_physical_memory_get_dirty(addr, MIGRATION_DIRTY_FLAG)) { count++; } @@ -167,7 +167,7 @@ uint64_t ram_bytes_transferred(void) uint64_t ram_bytes_total(void) { - return last_ram_offset; + return ram.last_offset; } int ram_save_live(Monitor *mon, QEMUFile *f, int stage, void *opaque) @@ -191,7 +191,7 @@ int ram_save_live(Monitor *mon, QEMUFile *f, int stage, void *opaque) bytes_transferred = 0; /* Make sure all dirty bits are set */ - for (addr = 0; addr < last_ram_offset; addr += TARGET_PAGE_SIZE) { + for (addr = 0; addr < ram.last_offset; addr += TARGET_PAGE_SIZE) { if (!cpu_physical_memory_get_dirty(addr, MIGRATION_DIRTY_FLAG)) { cpu_physical_memory_set_dirty(addr); } @@ -200,7 +200,7 @@ int ram_save_live(Monitor *mon, QEMUFile *f, int stage, void *opaque) /* Enable dirty memory tracking */ cpu_physical_memory_set_dirty_tracking(1); - qemu_put_be64(f, last_ram_offset | RAM_SAVE_FLAG_MEM_SIZE); + qemu_put_be64(f, ram.last_offset | RAM_SAVE_FLAG_MEM_SIZE); } bytes_transferred_last = bytes_transferred; @@ -259,7 +259,7 @@ int ram_load(QEMUFile *f, void *opaque, int version_id) addr &= TARGET_PAGE_MASK; if (flags & RAM_SAVE_FLAG_MEM_SIZE) { - if (addr != last_ram_offset) { + if (addr != ram.last_offset) { return -EINVAL; } } diff --git a/cpu-all.h b/cpu-all.h index 77eaf85..458cb4b 100644 --- a/cpu-all.h +++ b/cpu-all.h @@ -859,9 +859,21 @@ target_phys_addr_t cpu_get_phys_page_debug(CPUState *env, target_ulong addr); /* memory API */ extern int phys_ram_fd; -extern uint8_t *phys_ram_dirty; extern ram_addr_t ram_size; -extern ram_addr_t last_ram_offset; + +typedef struct RAMBlock { + uint8_t *host; + ram_addr_t offset; + ram_addr_t length; + QLIST_ENTRY(RAMBlock) next; +} RAMBlock; + +typedef struct RAMList { + uint8_t *phys_dirty; + ram_addr_t last_offset; + QLIST_HEAD(ram, RAMBlock) blocks; +} RAMList; +extern RAMList ram; extern const char *mem_path; extern int mem_prealloc; @@ -891,29 +903,29 @@ extern int mem_prealloc; /* read dirty bit (return 0 or 1) */ static inline int cpu_physical_memory_is_dirty(ram_addr_t addr) { - return phys_ram_dirty[addr >> TARGET_PAGE_BITS] == 0xff; + return ram.phys_dirty[addr >> TARGET_PAGE_BITS] == 0xff; } static inline int cpu_physical_memory_get_dirty_flags(ram_addr_t addr) { - return phys_ram_dirty[addr >> TARGET_PAGE_BITS]; + return ram.phys_dirty[addr >> TARGET_PAGE_BITS]; } static inline int cpu_physical_memory_get_dirty(ram_addr_t addr, int dirty_flags) { - return phys_ram_dirty[addr >> TARGET_PAGE_BITS] & dirty_flags; + return ram.phys_dirty[addr >> TARGET_PAGE_BITS] & dirty_flags; } static inline void cpu_physical_memory_set_dirty(ram_addr_t addr) { - phys_ram_dirty[addr >> TARGET_PAGE_BITS] = 0xff; + ram.phys_dirty[addr >> TARGET_PAGE_BITS] = 0xff; } static inline int cpu_physical_memory_set_dirty_flags(ram_addr_t addr, int dirty_flags) { - return phys_ram_dirty[addr >> TARGET_PAGE_BITS] |= dirty_flags; + return ram.phys_dirty[addr >> TARGET_PAGE_BITS] |= dirty_flags; } static inline void cpu_physical_memory_mask_dirty_range(ram_addr_t start, @@ -925,7 +937,7 @@ static inline void cpu_physical_memory_mask_dirty_range(ram_addr_t start, len = length >> TARGET_PAGE_BITS; mask = ~dirty_flags; - p = phys_ram_dirty + (start >> TARGET_PAGE_BITS); + p = ram.phys_dirty + (start >> TARGET_PAGE_BITS); for (i = 0; i < len; i++) { p[i] &= mask; } diff --git a/exec.c b/exec.c index c60f9e7..d785de3 100644 --- a/exec.c +++ b/exec.c @@ -116,21 +116,9 @@ uint8_t *code_gen_ptr; #if !defined(CONFIG_USER_ONLY) int phys_ram_fd; -uint8_t *phys_ram_dirty; static int in_migration; -typedef struct RAMBlock { - uint8_t *host; - ram_addr_t offset; - ram_addr_t length; - struct RAMBlock *next; -} RAMBlock; - -static RAMBlock *ram_blocks; -/* TODO: When we implement (and use) ram deallocation (e.g. for hotplug) - then we can no longer assume contiguous ram offsets, and external uses - of this variable will break. */ -ram_addr_t last_ram_offset; +RAMList ram = { .blocks = QLIST_HEAD_INITIALIZER(ram) }; #endif CPUState *first_cpu; @@ -2795,18 +2783,17 @@ ram_addr_t qemu_ram_map(ram_addr_t size, void *host) new_block->host = host; - new_block->offset = last_ram_offset; + new_block->offset = ram.last_offset; new_block->length = size; - new_block->next = ram_blocks; - ram_blocks = new_block; + QLIST_INSERT_HEAD(&ram.blocks, new_block, next); - phys_ram_dirty = qemu_realloc(phys_ram_dirty, - (last_ram_offset + size) >> TARGET_PAGE_BITS); - memset(phys_ram_dirty + (last_ram_offset >> TARGET_PAGE_BITS), + ram.phys_dirty = qemu_realloc(ram.phys_dirty, + (ram.last_offset + size) >> TARGET_PAGE_BITS); + memset(ram.phys_dirty + (ram.last_offset >> TARGET_PAGE_BITS), 0xff, size >> TARGET_PAGE_BITS); - last_ram_offset += size; + ram.last_offset += size; if (kvm_enabled()) kvm_setup_guest_memory(new_block->host, size); @@ -2864,31 +2851,17 @@ void qemu_ram_free(ram_addr_t addr) */ void *qemu_get_ram_ptr(ram_addr_t addr) { - RAMBlock *prev; - RAMBlock **prevp; RAMBlock *block; - prev = NULL; - prevp = &ram_blocks; - block = ram_blocks; - while (block && (block->offset > addr - || block->offset + block->length <= addr)) { - if (prev) - prevp = &prev->next; - prev = block; - block = block->next; - } - if (!block) { - fprintf(stderr, "Bad ram offset %" PRIx64 "\n", (uint64_t)addr); - abort(); - } - /* Move this entry to to start of the list. */ - if (prev) { - prev->next = block->next; - block->next = *prevp; - *prevp = block; + QLIST_FOREACH(block, &ram.blocks, next) { + if (addr - block->offset < block->length) { + QLIST_REMOVE(block, next); + QLIST_INSERT_HEAD(&ram.blocks, block, next); + return block->host + (addr - block->offset); + } } - return block->host + (addr - block->offset); + + return NULL; } int do_qemu_ram_addr_from_host(void *ptr, ram_addr_t *ram_addr) @@ -2896,15 +2869,14 @@ int do_qemu_ram_addr_from_host(void *ptr, ram_addr_t *ram_addr) RAMBlock *block; uint8_t *host = ptr; - block = ram_blocks; - while (block && (block->host > host - || block->host + block->length <= host)) { - block = block->next; + QLIST_FOREACH(block, &ram.blocks, next) { + if (host - block->host < block->length) { + *ram_addr = block->offset + (host - block->host); + return 0; + } } - if (!block) - return -1; - *ram_addr = block->offset + (host - block->host); - return 0; + + return -1; } /* Some of the softmmu routines need to translate from a host pointer