From fa5376dd8adb5ad104e5773f09c15af2e8a76738 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= Date: Fri, 16 Sep 2016 19:50:23 +0400 Subject: linux-user-i386: Fix crash on cpuid MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Running cpuid instructions with a simple run like: i386-linux-user/qemu-i386 tests/tcg/sha1-i386 Results in the following assert: #0 0x00007ffff64246f5 in raise () from /lib64/libc.so.6 #1 0x00007ffff64262fa in abort () from /lib64/libc.so.6 #2 0x00007ffff7937ec5 in g_assertion_message () from /lib64/libglib-2.0.so.0 #3 0x00007ffff7937f5a in g_assertion_message_expr () from /lib64/libglib-2.0.so.0 #4 0x000055555561b54c in apicid_bitwidth_for_count (count=0) at /home/elmarco/src/qemu/include/hw/i386/topology.h:58 #5 0x000055555561b58a in apicid_smt_width (nr_cores=0, nr_threads=0) at /home/elmarco/src/qemu/include/hw/i386/topology.h:67 #6 0x000055555561b5c3 in apicid_core_offset (nr_cores=0, nr_threads=0) at /home/elmarco/src/qemu/include/hw/i386/topology.h:82 #7 0x000055555561b5e3 in apicid_pkg_offset (nr_cores=0, nr_threads=0) at /home/elmarco/src/qemu/include/hw/i386/topology.h:89 #8 0x000055555561dd86 in cpu_x86_cpuid (env=0x555557999550, index=4, count=3, eax=0x7fffffffcae8, ebx=0x7fffffffcaec, ecx=0x7fffffffcaf0, edx=0x7fffffffcaf4) at /home/elmarco/src/qemu/target-i386/cpu.c:2405 #9 0x0000555555638e8e in helper_cpuid (env=0x555557999550) at /home/elmarco/src/qemu/target-i386/misc_helper.c:106 #10 0x000055555599dc5e in static_code_gen_buffer () #11 0x00005555555952f8 in cpu_tb_exec (cpu=0x5555579912d0, itb=0x7ffff4371ab0) at /home/elmarco/src/qemu/cpu-exec.c:166 #12 0x0000555555595c8e in cpu_loop_exec_tb (cpu=0x5555579912d0, tb=0x7ffff4371ab0, last_tb=0x7fffffffd088, tb_exit=0x7fffffffd084, sc=0x7fffffffd0a0) at /home/elmarco/src/qemu/cpu-exec.c:517 #13 0x0000555555595e50 in cpu_exec (cpu=0x5555579912d0) at /home/elmarco/src/qemu/cpu-exec.c:612 #14 0x00005555555c065b in cpu_loop (env=0x555557999550) at /home/elmarco/src/qemu/linux-user/main.c:297 #15 0x00005555555c25b2 in main (argc=2, argv=0x7fffffffd848, envp=0x7fffffffd860) at /home/elmarco/src/qemu/linux-user/main.c:4803 The fields are set in qemu_init_vcpu() with softmmu, but it's a stub with linux-user. Signed-off-by: Marc-André Lureau Reviewed-by: Eduardo Habkost Signed-off-by: Eduardo Habkost --- qom/cpu.c | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'qom') diff --git a/qom/cpu.c b/qom/cpu.c index 2553247907..f783b5a6bd 100644 --- a/qom/cpu.c +++ b/qom/cpu.c @@ -342,6 +342,11 @@ static void cpu_common_initfn(Object *obj) cpu->cpu_index = UNASSIGNED_CPU_INDEX; cpu->gdb_num_regs = cpu->gdb_num_g_regs = cc->gdb_num_core_regs; + /* *-user doesn't have configurable SMP topology */ + /* the default value is changed by qemu_init_vcpu() for softmmu */ + cpu->nr_cores = 1; + cpu->nr_threads = 1; + qemu_mutex_init(&cpu->work_mutex); QTAILQ_INIT(&cpu->breakpoints); QTAILQ_INIT(&cpu->watchpoints); -- cgit v1.2.3