[Qemu-devel] [PATCH 1/5] target-arm: add powered off cpu state

[Ard Biesheuvel <ard.biesheuvel@linaro.org>]

From: Rob Herring <rob.herring@linaro.org>

Add tracking of cpu power state in order to support powering off of
cores in system emuluation. The initial state is determined by the
start-powered-off QOM property.

Signed-off-by: Rob Herring <rob.herring@linaro.org>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
---
 target-arm/cpu-qom.h | 1 +
 target-arm/cpu.c     | 7 ++++++-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/target-arm/cpu-qom.h b/target-arm/cpu-qom.h
index 07f3c9e86639..f71f6a4ccc6b 100644
--- a/target-arm/cpu-qom.h
+++ b/target-arm/cpu-qom.h
@@ -98,6 +98,7 @@ typedef struct ARMCPU {
 
     /* Should CPU start in PSCI powered-off state? */
     bool start_powered_off;
+    bool powered_off;
 
     /* [QEMU_]KVM_ARM_TARGET_* constant for this CPU, or
      * QEMU_KVM_ARM_TARGET_NONE if the kernel doesn't support this CPU type.
diff --git a/target-arm/cpu.c b/target-arm/cpu.c
index 8199f32e3267..b4c06c17cf87 100644
--- a/target-arm/cpu.c
+++ b/target-arm/cpu.c
@@ -40,7 +40,9 @@ static void arm_cpu_set_pc(CPUState *cs, vaddr value)
 
 static bool arm_cpu_has_work(CPUState *cs)
 {
-    return cs->interrupt_request &
+    ARMCPU *cpu = ARM_CPU(cs);
+
+    return !cpu->powered_off && cs->interrupt_request &
         (CPU_INTERRUPT_FIQ | CPU_INTERRUPT_HARD | CPU_INTERRUPT_EXITTB);
 }
 
@@ -91,6 +93,9 @@ static void arm_cpu_reset(CPUState *s)
     env->vfp.xregs[ARM_VFP_MVFR1] = cpu->mvfr1;
     env->vfp.xregs[ARM_VFP_MVFR2] = cpu->mvfr2;
 
+    cpu->powered_off = cpu->start_powered_off;
+    s->halted = cpu->start_powered_off;
+
     if (arm_feature(env, ARM_FEATURE_IWMMXT)) {
         env->iwmmxt.cregs[ARM_IWMMXT_wCID] = 0x69051000 | 'Q';
     }
-- 
1.8.3.2