[v2] accel, cpus: clean up cpu->exit_request

[PATCH 13/18] cpus: remove TCG-ism from cpu_exit()

Paolo Bonzini posted 18 patches 1 week ago

Diff against v1
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Maintainers: Richard Henderson <richard.henderson@linaro.org>, Paolo Bonzini <pbonzini@redhat.com>, "Philippe Mathieu-Daudé" <philmd@linaro.org>, Cameron Esfahani <dirty@apple.com>, Roman Bolshakov <rbolshakov@ddn.com>, Phil Dennis-Jordan <phil@philjordan.eu>, Mads Ynddal <mads@ynddal.dk>, Riku Voipio <riku.voipio@iki.fi>, Warner Losh <imp@bsdimp.com>, Kyle Evans <kevans@freebsd.org>, Eduardo Habkost <eduardo@habkost.net>, Marcel Apfelbaum <marcel.apfelbaum@gmail.com>, Yanan Wang <wangyanan55@huawei.com>, Zhao Liu <zhao1.liu@intel.com>, Nicholas Piggin <npiggin@gmail.com>, Chinmay Rath <rathc@linux.ibm.com>, Harsh Prateek Bora <harshpb@linux.ibm.com>, Laurent Vivier <laurent@vivier.eu>, Brian Cain <brian.cain@oss.qualcomm.com>, "Alex Bennée" <alex.bennee@linaro.org>, Peter Maydell <peter.maydell@linaro.org>, Michael Rolnik <mrolnik@gmail.com>, Marcelo Tosatti <mtosatti@redhat.com>, Reinoud Zandijk <reinoud@netbsd.org>, Sunil Muthuswamy <sunilmut@microsoft.com>, Stafford Horne <shorne@gmail.com>, Yoshinori Sato <yoshinori.sato@nifty.com>, David Hildenbrand <david@redhat.com>, Ilya Leoshkevich <iii@linux.ibm.com>, Thomas Huth <thuth@redhat.com>, Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>, Artyom Tarasenko <atar4qemu@gmail.com>

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[PATCH 13/18] cpus: remove TCG-ism from cpu_exit()

Posted by Paolo Bonzini 1 week ago

Now that TCG has its own kick function, make cpu_exit() do the right kick
for all accelerators.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 hw/core/cpu-common.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/hw/core/cpu-common.c b/hw/core/cpu-common.c
index ca00accd162..3fa9fa82228 100644
--- a/hw/core/cpu-common.c
+++ b/hw/core/cpu-common.c
@@ -76,9 +76,7 @@ void cpu_exit(CPUState *cpu)
 {
     /* Ensure cpu_exec will see the reason why the exit request was set.  */
     qatomic_store_release(&cpu->exit_request, true);
-    /* Ensure cpu_exec will see the exit request after TCG has exited.  */
-    smp_wmb();
-    qatomic_set(&cpu->neg.icount_decr.u16.high, -1);
+    qemu_cpu_kick(cpu);
 }
 
 static int cpu_common_gdb_read_register(CPUState *cpu, GByteArray *buf, int reg)
-- 
2.51.0

Re: [PATCH 13/18] cpus: remove TCG-ism from cpu_exit()

Posted by Igor Mammedov 4 days, 14 hours ago

On Fri, 29 Aug 2025 17:31:10 +0200
Paolo Bonzini <pbonzini@redhat.com> wrote:

> Now that TCG has its own kick function, make cpu_exit() do the right kick
> for all accelerators.
> 
> Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
> Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

Reviewed-by: Igor Mammedov <imammedo@redhat.com>

> ---
>  hw/core/cpu-common.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/hw/core/cpu-common.c b/hw/core/cpu-common.c
> index ca00accd162..3fa9fa82228 100644
> --- a/hw/core/cpu-common.c
> +++ b/hw/core/cpu-common.c
> @@ -76,9 +76,7 @@ void cpu_exit(CPUState *cpu)
>  {
>      /* Ensure cpu_exec will see the reason why the exit request was set.  */
>      qatomic_store_release(&cpu->exit_request, true);
> -    /* Ensure cpu_exec will see the exit request after TCG has exited.  */
> -    smp_wmb();
> -    qatomic_set(&cpu->neg.icount_decr.u16.high, -1);
> +    qemu_cpu_kick(cpu);
>  }
>  
>  static int cpu_common_gdb_read_register(CPUState *cpu, GByteArray *buf, int reg)