diff options
Diffstat (limited to 'accel/tcg')
| -rw-r--r-- | accel/tcg/tcg-all.c | 26 | ||||
| -rw-r--r-- | accel/tcg/translate-all.c | 35 |
2 files changed, 52 insertions, 9 deletions
diff --git a/accel/tcg/tcg-all.c b/accel/tcg/tcg-all.c index 1ac0b76515..2eea8c32ee 100644 --- a/accel/tcg/tcg-all.c +++ b/accel/tcg/tcg-all.c @@ -38,6 +38,7 @@ struct TCGState { AccelState parent_obj; bool mttcg_enabled; + int splitwx_enabled; unsigned long tb_size; }; typedef struct TCGState TCGState; @@ -94,6 +95,13 @@ static void tcg_accel_instance_init(Object *obj) TCGState *s = TCG_STATE(obj); s->mttcg_enabled = default_mttcg_enabled(); + + /* If debugging enabled, default "auto on", otherwise off. */ +#ifdef CONFIG_DEBUG_TCG + s->splitwx_enabled = -1; +#else + s->splitwx_enabled = 0; +#endif } bool mttcg_enabled; @@ -102,7 +110,7 @@ static int tcg_init(MachineState *ms) { TCGState *s = TCG_STATE(current_accel()); - tcg_exec_init(s->tb_size * 1024 * 1024); + tcg_exec_init(s->tb_size * 1024 * 1024, s->splitwx_enabled); mttcg_enabled = s->mttcg_enabled; /* @@ -179,6 +187,18 @@ static void tcg_set_tb_size(Object *obj, Visitor *v, s->tb_size = value; } +static bool tcg_get_splitwx(Object *obj, Error **errp) +{ + TCGState *s = TCG_STATE(obj); + return s->splitwx_enabled; +} + +static void tcg_set_splitwx(Object *obj, bool value, Error **errp) +{ + TCGState *s = TCG_STATE(obj); + s->splitwx_enabled = value; +} + static void tcg_accel_class_init(ObjectClass *oc, void *data) { AccelClass *ac = ACCEL_CLASS(oc); @@ -196,6 +216,10 @@ static void tcg_accel_class_init(ObjectClass *oc, void *data) object_class_property_set_description(oc, "tb-size", "TCG translation block cache size"); + object_class_property_add_bool(oc, "split-wx", + tcg_get_splitwx, tcg_set_splitwx); + object_class_property_set_description(oc, "split-wx", + "Map jit pages into separate RW and RX regions"); } static const TypeInfo tcg_accel_type = { diff --git a/accel/tcg/translate-all.c b/accel/tcg/translate-all.c index ae87b2342a..022f9c743d 100644 --- a/accel/tcg/translate-all.c +++ b/accel/tcg/translate-all.c @@ -1015,13 +1015,19 @@ static inline void *split_cross_256mb(void *buf1, size_t size1) static uint8_t static_code_gen_buffer[DEFAULT_CODE_GEN_BUFFER_SIZE] __attribute__((aligned(CODE_GEN_ALIGN))); -static bool alloc_code_gen_buffer(size_t tb_size, Error **errp) +static bool alloc_code_gen_buffer(size_t tb_size, int splitwx, Error **errp) { - void *buf = static_code_gen_buffer; - void *end = static_code_gen_buffer + sizeof(static_code_gen_buffer); + void *buf, *end; size_t size; + if (splitwx > 0) { + error_setg(errp, "jit split-wx not supported"); + return false; + } + /* page-align the beginning and end of the buffer */ + buf = static_code_gen_buffer; + end = static_code_gen_buffer + sizeof(static_code_gen_buffer); buf = QEMU_ALIGN_PTR_UP(buf, qemu_real_host_page_size); end = QEMU_ALIGN_PTR_DOWN(end, qemu_real_host_page_size); @@ -1050,9 +1056,16 @@ static bool alloc_code_gen_buffer(size_t tb_size, Error **errp) return true; } #elif defined(_WIN32) -static bool alloc_code_gen_buffer(size_t size, Error **errp) +static bool alloc_code_gen_buffer(size_t size, int splitwx, Error **errp) { - void *buf = VirtualAlloc(NULL, size, MEM_RESERVE | MEM_COMMIT, + void *buf; + + if (splitwx > 0) { + error_setg(errp, "jit split-wx not supported"); + return false; + } + + buf = VirtualAlloc(NULL, size, MEM_RESERVE | MEM_COMMIT, PAGE_EXECUTE_READWRITE); if (buf == NULL) { error_setg_win32(errp, GetLastError(), @@ -1065,12 +1078,17 @@ static bool alloc_code_gen_buffer(size_t size, Error **errp) return true; } #else -static bool alloc_code_gen_buffer(size_t size, Error **errp) +static bool alloc_code_gen_buffer(size_t size, int splitwx, Error **errp) { int prot = PROT_WRITE | PROT_READ | PROT_EXEC; int flags = MAP_PRIVATE | MAP_ANONYMOUS; void *buf; + if (splitwx > 0) { + error_setg(errp, "jit split-wx not supported"); + return false; + } + buf = mmap(NULL, size, prot, flags, -1, 0); if (buf == MAP_FAILED) { error_setg_errno(errp, errno, @@ -1145,7 +1163,7 @@ static void tb_htable_init(void) /* Must be called before using the QEMU cpus. 'tb_size' is the size (in bytes) allocated to the translation buffer. Zero means default size. */ -void tcg_exec_init(unsigned long tb_size) +void tcg_exec_init(unsigned long tb_size, int splitwx) { bool ok; @@ -1154,7 +1172,8 @@ void tcg_exec_init(unsigned long tb_size) page_init(); tb_htable_init(); - ok = alloc_code_gen_buffer(size_code_gen_buffer(tb_size), &error_fatal); + ok = alloc_code_gen_buffer(size_code_gen_buffer(tb_size), + splitwx, &error_fatal); assert(ok); #if defined(CONFIG_SOFTMMU) |