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Re: [Qemu-devel] [RFC 0/5] Slow-path for atomic instruction translation

From: Emilio G. Cota
Subject: Re: [Qemu-devel] [RFC 0/5] Slow-path for atomic instruction translation
Date: Fri, 8 May 2015 14:29:47 -0400
User-agent: Mutt/1.5.21 (2010-09-15)

On Wed, May 06, 2015 at 17:38:02 +0200, Alvise Rigo wrote:
> This patch series provides an infrastructure for atomic
> instruction implementation in QEMU, paving the way for TCG multi-threading.
> The adopted design does not rely on host atomic
> instructions and is intended to propose a 'legacy' solution for
> translating guest atomic instructions.

Patch 2 doesn't apply to current master. I fixed the conflict manually
and get a segfault before it boots:

(gdb) bt
#0  0x0000555555657b04 in test_bit (addr=<optimized out>, nr=<optimized out>)
    at /local/home/cota/src/qemu/include/qemu/bitops.h:119
#1  cpu_physical_memory_excl_is_dirty (addr=18446744073709551615)
    at /local/home/cota/src/qemu/include/exec/ram_addr.h:214
#2  tlb_set_page_with_attrs (cpu=<optimized out>, vaddr=<optimized out>, 
    paddr=503316480, attrs=..., prot=<optimized out>, mmu_idx=3, size=1024)
    at /local/home/cota/src/qemu/cputlb.c:328
#3  0x0000555555714c68 in arm_cpu_handle_mmu_fault (cs=0x555556334500, 
    address=<optimized out>, access_type=0, mmu_idx=3)
    at /local/home/cota/src/qemu/target-arm/helper.c:5813
#4  0x00005555557077b0 in tlb_fill (cs=0x555556334500, addr=<optimized out>, 
    is_write=<optimized out>, mmu_idx=<optimized out>, retaddr=140737065132893)
    at /local/home/cota/src/qemu/target-arm/op_helper.c:69
#5  0x000055555565939f in helper_le_ldul_mmu (env=0x55555633c750, 
    addr=503316484, mmu_idx=3, retaddr=<optimized out>)
    at /local/home/cota/src/qemu/softmmu_template.h:192
#6  0x00007fffe6c623db in code_gen_buffer ()
#7  0x00005555556156ea in cpu_tb_exec (
    tb_ptr=0x7fffe6c62320 "A\213n\374\205\355\017\205\207", cpu=0x555556334500)
    at /local/home/cota/src/qemu/cpu-exec.c:199
#8  cpu_arm_exec (env=0x55555633c750)
    at /local/home/cota/src/qemu/cpu-exec.c:519
#9  0x000055555563c340 in tcg_cpu_exec (env=0x55555633c750)
    at /local/home/cota/src/qemu/cpus.c:1354
#10 tcg_exec_all () at /local/home/cota/src/qemu/cpus.c:1387
#11 qemu_tcg_cpu_thread_fn (arg=<optimized out>)
    at /local/home/cota/src/qemu/cpus.c:1032
#12 0x00007ffff40dfe9a in start_thread (arg=0x7fffe4a45700)
    at pthread_create.c:308
#13 0x00007ffff3e0d38d in clone ()
    at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#14 0x0000000000000000 in ?? ()

It could be that my manual fix of the conflicts was wrong. What commit
are your patches based on?



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