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[Qemu-devel] [PATCH 01/35] tcg: access cpu->icount_decr.u16.high with at
From: |
Emilio G. Cota |
Subject: |
[Qemu-devel] [PATCH 01/35] tcg: access cpu->icount_decr.u16.high with atomics |
Date: |
Mon, 17 Sep 2018 12:30:29 -0400 |
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.
Cc: Peter Crosthwaite <address@hidden>
Cc: Richard Henderson <address@hidden>
Signed-off-by: Emilio G. Cota <address@hidden>
---
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 898c3bb3d1..f7784bbc2d 100644
--- a/accel/tcg/translate-all.c
+++ b/accel/tcg/translate-all.c
@@ -2352,7 +2352,7 @@ 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;
--
2.17.1
- Re: [Qemu-devel] [PATCH 11/35] target/i386: access cpu->interrupt_request with atomics, (continued)
- [Qemu-devel] [PATCH 10/35] target/hppa: access cpu->interrupt_request with atomics, Emilio G. Cota, 2018/09/17
- [Qemu-devel] [PATCH 08/35] target/arm: access cpu->interrupt_request with atomics, Emilio G. Cota, 2018/09/17
- [Qemu-devel] [PATCH 02/35] target/i386: use cpu_reset_interrupt, Emilio G. Cota, 2018/09/17
- [Qemu-devel] [PATCH 18/35] target/mips: access cpu->interrupt_request with atomics, Emilio G. Cota, 2018/09/17
- [Qemu-devel] [PATCH 01/35] tcg: access cpu->icount_decr.u16.high with atomics,
Emilio G. Cota <=
- [Qemu-devel] [PATCH 34/35] exec: push BQL down to cpu->do_interrupt, Emilio G. Cota, 2018/09/17
- [Qemu-devel] [PATCH 16/35] target/m68k: access cpu->interrupt_request with atomics, Emilio G. Cota, 2018/09/17
- [Qemu-devel] [PATCH 20/35] target/nios2: access cpu->interrupt_request with atomics, Emilio G. Cota, 2018/09/17