From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:59698) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gCTTP-00046V-6H for qemu-devel@nongnu.org; Tue, 16 Oct 2018 13:49:40 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gCTTL-00010T-1V for qemu-devel@nongnu.org; Tue, 16 Oct 2018 13:49:38 -0400 Received: from mail-pf1-x429.google.com ([2607:f8b0:4864:20::429]:34559) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1gCTTK-0000fG-LU for qemu-devel@nongnu.org; Tue, 16 Oct 2018 13:49:34 -0400 Received: by mail-pf1-x429.google.com with SMTP id f78-v6so6060615pfe.1 for ; Tue, 16 Oct 2018 10:49:18 -0700 (PDT) From: Richard Henderson Date: Tue, 16 Oct 2018 10:48:52 -0700 Message-Id: <20181016174911.9052-3-richard.henderson@linaro.org> In-Reply-To: <20181016174911.9052-1-richard.henderson@linaro.org> References: <20181016174911.9052-1-richard.henderson@linaro.org> Subject: [Qemu-devel] [PULL 02/21] tcg: access cpu->icount_decr.u16.high with atomics List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: peter.maydell@linaro.org, "Emilio G. Cota" From: "Emilio G. Cota" Consistently access u16.high with atomics to avoid undefined behaviour in MTTCG. Note that icount_decr.u16.low is only used in icount mode, so regular accesses to it are OK. Reviewed-by: Richard Henderson Signed-off-by: Emilio G. Cota Message-Id: <20181010144853.13005-2-cota@braap.org> Signed-off-by: Richard Henderson --- accel/tcg/tcg-all.c | 2 +- accel/tcg/translate-all.c | 2 +- qom/cpu.c | 2 +- 3 files changed, 3 insertions(+), 3 deletions(-) diff --git a/accel/tcg/tcg-all.c b/accel/tcg/tcg-all.c index 56dbb56a16..3d25bdcc17 100644 --- a/accel/tcg/tcg-all.c +++ b/accel/tcg/tcg-all.c @@ -51,7 +51,7 @@ static void tcg_handle_interrupt(CPUState *cpu, int mask) if (!qemu_cpu_is_self(cpu)) { qemu_cpu_kick(cpu); } else { - cpu->icount_decr.u16.high = -1; + atomic_set(&cpu->icount_decr.u16.high, -1); if (use_icount && !cpu->can_do_io && (mask & ~old_mask) != 0) { diff --git a/accel/tcg/translate-all.c b/accel/tcg/translate-all.c index ad5c758246..356dcd0948 100644 --- a/accel/tcg/translate-all.c +++ b/accel/tcg/translate-all.c @@ -2341,7 +2341,7 @@ void cpu_interrupt(CPUState *cpu, int mask) { g_assert(qemu_mutex_iothread_locked()); cpu->interrupt_request |= mask; - cpu->icount_decr.u16.high = -1; + atomic_set(&cpu->icount_decr.u16.high, -1); } /* diff --git a/qom/cpu.c b/qom/cpu.c index 92599f3541..20ad54d43f 100644 --- a/qom/cpu.c +++ b/qom/cpu.c @@ -266,7 +266,7 @@ static void cpu_common_reset(CPUState *cpu) cpu->mem_io_pc = 0; cpu->mem_io_vaddr = 0; cpu->icount_extra = 0; - cpu->icount_decr.u32 = 0; + atomic_set(&cpu->icount_decr.u32, 0); cpu->can_do_io = 1; cpu->exception_index = -1; cpu->crash_occurred = false; -- 2.17.2