exec: drop BQL from interrupt handling

[Qemu-devel] [PATCH 24/35] target/sh4: access cpu->interrupt_request with atomics

Posted by Emilio G. Cota 7 years, 1 month ago

From: Paolo Bonzini <pbonzini@redhat.com>

Cc: Aurelien Jarno <aurelien@aurel32.net>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Emilio G. Cota <cota@braap.org>
---
 target/sh4/cpu.c    | 2 +-
 target/sh4/helper.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/target/sh4/cpu.c b/target/sh4/cpu.c
index b9f393b7c7..892a023c5c 100644
--- a/target/sh4/cpu.c
+++ b/target/sh4/cpu.c
@@ -45,7 +45,7 @@ static void superh_cpu_synchronize_from_tb(CPUState *cs, TranslationBlock *tb)
 
 static bool superh_cpu_has_work(CPUState *cs)
 {
-    return cs->interrupt_request & CPU_INTERRUPT_HARD;
+    return atomic_read(&cs->interrupt_request) & CPU_INTERRUPT_HARD;
 }
 
 /* CPUClass::reset() */
diff --git a/target/sh4/helper.c b/target/sh4/helper.c
index 2ff0cf4060..c699b8c0a1 100644
--- a/target/sh4/helper.c
+++ b/target/sh4/helper.c
@@ -83,7 +83,7 @@ void superh_cpu_do_interrupt(CPUState *cs)
 {
     SuperHCPU *cpu = SUPERH_CPU(cs);
     CPUSH4State *env = &cpu->env;
-    int do_irq = cs->interrupt_request & CPU_INTERRUPT_HARD;
+    int do_irq = atomic_read(&cs->interrupt_request) & CPU_INTERRUPT_HARD;
     int do_exp, irq_vector = cs->exception_index;
 
     /* prioritize exceptions over interrupts */
-- 
2.17.1

Re: [Qemu-devel] [PATCH 24/35] target/sh4: access cpu->interrupt_request with atomics

Posted by Philippe Mathieu-Daudé 7 years, 1 month ago

On 9/17/18 6:30 PM, Emilio G. Cota wrote:
> From: Paolo Bonzini <pbonzini@redhat.com>
> 
> Cc: Aurelien Jarno <aurelien@aurel32.net>
> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
> Signed-off-by: Emilio G. Cota <cota@braap.org>

Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>

> ---
>  target/sh4/cpu.c    | 2 +-
>  target/sh4/helper.c | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/target/sh4/cpu.c b/target/sh4/cpu.c
> index b9f393b7c7..892a023c5c 100644
> --- a/target/sh4/cpu.c
> +++ b/target/sh4/cpu.c
> @@ -45,7 +45,7 @@ static void superh_cpu_synchronize_from_tb(CPUState *cs, TranslationBlock *tb)
>  
>  static bool superh_cpu_has_work(CPUState *cs)
>  {
> -    return cs->interrupt_request & CPU_INTERRUPT_HARD;
> +    return atomic_read(&cs->interrupt_request) & CPU_INTERRUPT_HARD;
>  }
>  
>  /* CPUClass::reset() */
> diff --git a/target/sh4/helper.c b/target/sh4/helper.c
> index 2ff0cf4060..c699b8c0a1 100644
> --- a/target/sh4/helper.c
> +++ b/target/sh4/helper.c
> @@ -83,7 +83,7 @@ void superh_cpu_do_interrupt(CPUState *cs)
>  {
>      SuperHCPU *cpu = SUPERH_CPU(cs);
>      CPUSH4State *env = &cpu->env;
> -    int do_irq = cs->interrupt_request & CPU_INTERRUPT_HARD;
> +    int do_irq = atomic_read(&cs->interrupt_request) & CPU_INTERRUPT_HARD;
>      int do_exp, irq_vector = cs->exception_index;
>  
>      /* prioritize exceptions over interrupts */
>