From: Richard Henderson <richard.henderson@linaro.org>
To: qemu-devel@nongnu.org
Subject: [PATCH v2 07/12] linux-user: Use tb_flush_exclusive to start second thread
Date: Mon, 22 Sep 2025 19:39:11 -0700 [thread overview]
Message-ID: <20250923023922.3102471-8-richard.henderson@linaro.org> (raw)
In-Reply-To: <20250923023922.3102471-1-richard.henderson@linaro.org>
When we start the second thread, we discard all translations
so that we can re-do them with CF_PARALLEL. Since there is
as yet only one cpu, and we are processing a syscall, there
are no live translation blocks and we have exclusivity.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
linux-user/mmap.c | 4 ++--
linux-user/syscall.c | 2 +-
2 files changed, 3 insertions(+), 3 deletions(-)
diff --git a/linux-user/mmap.c b/linux-user/mmap.c
index 002e1e668e..bd2bbaf1f4 100644
--- a/linux-user/mmap.c
+++ b/linux-user/mmap.c
@@ -1010,7 +1010,7 @@ abi_long target_mmap(abi_ulong start, abi_ulong len, int target_prot,
CPUState *cpu = thread_cpu;
if (!tcg_cflags_has(cpu, CF_PARALLEL)) {
tcg_cflags_set(cpu, CF_PARALLEL);
- tb_flush(cpu);
+ tb_flush__exclusive();
}
}
@@ -1450,7 +1450,7 @@ abi_ulong target_shmat(CPUArchState *cpu_env, int shmid,
*/
if (!tcg_cflags_has(cpu, CF_PARALLEL)) {
tcg_cflags_set(cpu, CF_PARALLEL);
- tb_flush(cpu);
+ tb_flush__exclusive();
}
if (qemu_loglevel_mask(CPU_LOG_PAGE)) {
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 91360a072c..d9c394856f 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -6633,7 +6633,7 @@ static int do_fork(CPUArchState *env, unsigned int flags, abi_ulong newsp,
*/
if (!tcg_cflags_has(cpu, CF_PARALLEL)) {
tcg_cflags_set(cpu, CF_PARALLEL);
- tb_flush(cpu);
+ tb_flush__exclusive();
}
/* we create a new CPU instance. */
--
2.43.0
next prev parent reply other threads:[~2025-09-23 2:42 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-09-23 2:39 [PATCH v2 00/12] accel/tcg: Improve tb_flush usage Richard Henderson
2025-09-23 2:39 ` [PATCH v2 01/12] gdbstub: Remove tb_flush uses Richard Henderson
2025-09-23 9:11 ` Philippe Mathieu-Daudé
2025-09-23 16:23 ` Richard Henderson
2025-09-23 2:39 ` [PATCH v2 02/12] accel/tcg: Split out tb_flush__exclusive Richard Henderson
2025-09-23 7:17 ` Philippe Mathieu-Daudé
2025-09-23 9:16 ` Philippe Mathieu-Daudé
2025-09-23 2:39 ` [PATCH v2 03/12] target/alpha: Simplify call_pal implementation Richard Henderson
2025-09-23 7:30 ` Philippe Mathieu-Daudé
2025-09-23 9:05 ` Philippe Mathieu-Daudé
2025-09-23 2:39 ` [PATCH v2 04/12] target/riscv: Record misa_ext in TCGTBCPUState.cs_base Richard Henderson
2025-09-24 6:17 ` LIU Zhiwei
2025-09-24 12:23 ` Daniel Henrique Barboza
2025-09-28 23:10 ` Alistair Francis
2025-09-23 2:39 ` [PATCH v2 05/12] accel/tcg: Move post-load tb_flush to vm_change_state hook Richard Henderson
2025-09-23 7:22 ` Philippe Mathieu-Daudé
2025-09-23 2:39 ` [PATCH v2 06/12] hw/ppc/spapr: Use tb_invalidate_phys_range in h_page_init Richard Henderson
2025-09-23 4:49 ` Harsh Prateek Bora
2025-09-23 8:55 ` Philippe Mathieu-Daudé
2025-09-23 9:45 ` Harsh Prateek Bora
2025-09-23 16:59 ` Richard Henderson
2025-09-23 2:39 ` Richard Henderson [this message]
2025-09-23 8:50 ` [PATCH v2 07/12] linux-user: Use tb_flush_exclusive to start second thread Philippe Mathieu-Daudé
2025-09-23 2:39 ` [PATCH v2 08/12] plugins: Use tb_flush__exclusive Richard Henderson
2025-09-23 7:33 ` Philippe Mathieu-Daudé
2025-09-23 13:35 ` Philippe Mathieu-Daudé
2025-09-23 20:28 ` Richard Henderson
2025-09-24 3:18 ` Philippe Mathieu-Daudé
2025-09-23 2:39 ` [PATCH v2 09/12] accel/tcg: Introduce EXCP_TB_FLUSH Richard Henderson
2025-09-23 7:10 ` Paolo Bonzini
2025-09-23 20:02 ` Richard Henderson
2025-09-23 2:39 ` [PATCH v2 10/12] accel/tcg: Use EXCP_TB_FLUSH in tb_gen_code Richard Henderson
2025-09-23 9:15 ` Philippe Mathieu-Daudé
2025-09-23 2:39 ` [PATCH v2 11/12] accel/tcg: Remove tb_flush Richard Henderson
2025-09-23 7:24 ` Philippe Mathieu-Daudé
2025-09-23 2:39 ` [PATCH v2 12/12] accel/tcg: Tighten assert in tb_flush__exclusive Richard Henderson
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