From a35b3e14157b9d912898d4800f329dc5f3c200a6 Mon Sep 17 00:00:00 2001 From: Richard Henderson Date: Wed, 28 Oct 2020 20:50:29 -0700 Subject: tcg: Add --accel tcg,split-wx property Plumb the value through to alloc_code_gen_buffer. This is not supported by any os or tcg backend, so for now enabling it will result in an error. Reviewed-by: Joelle van Dyne Signed-off-by: Richard Henderson --- accel/tcg/translate-all.c | 35 +++++++++++++++++++++++++++-------- 1 file changed, 27 insertions(+), 8 deletions(-) (limited to 'accel/tcg/translate-all.c') 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) -- cgit v1.2.3