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[Qemu-devel] [PATCH v5 2/4] spapr: Implement H_PROD

Nicholas Piggin posted 4 patches 6 years, 6 months ago
Maintainers: David Gibson <david@gibson.dropbear.id.au>
There is a newer version of this series
[Qemu-devel] [PATCH v5 2/4] spapr: Implement H_PROD
Posted by Nicholas Piggin 6 years, 6 months ago 
H_PROD is added, and H_CEDE is modified to test the prod bit
according to PAPR.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
 hw/ppc/spapr_hcall.c | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/hw/ppc/spapr_hcall.c b/hw/ppc/spapr_hcall.c
index e615881ac4..8b208ab259 100644
--- a/hw/ppc/spapr_hcall.c
+++ b/hw/ppc/spapr_hcall.c
@@ -1050,14 +1050,41 @@ static target_ulong h_cede(PowerPCCPU *cpu, SpaprMachineState *spapr,
 {
     CPUPPCState *env = &cpu->env;
     CPUState *cs = CPU(cpu);
+    SpaprCpuState *spapr_cpu = spapr_cpu_state(cpu);
 
     env->msr |= (1ULL << MSR_EE);
     hreg_compute_hflags(env);
+
+    if (spapr_cpu->prod) {
+        spapr_cpu->prod = false;
+        return H_SUCCESS;
+    }
+
     if (!cpu_has_work(cs)) {
         cs->halted = 1;
         cs->exception_index = EXCP_HLT;
         cs->exit_request = 1;
     }
+
+    return H_SUCCESS;
+}
+
+static target_ulong h_prod(PowerPCCPU *cpu, SpaprMachineState *spapr,
+                           target_ulong opcode, target_ulong *args)
+{
+    target_long target = args[0];
+    CPUState *cs;
+    SpaprCpuState *spapr_cpu = spapr_cpu_state(cpu);
+
+    cs = CPU(spapr_find_cpu(target));
+    if (!cs) {
+        return H_PARAMETER;
+    }
+
+    spapr_cpu->prod = true;
+    cs->halted = 0;
+    qemu_cpu_kick(cs);
+
     return H_SUCCESS;
 }
 
@@ -1882,6 +1909,8 @@ static void hypercall_register_types(void)
     /* hcall-splpar */
     spapr_register_hypercall(H_REGISTER_VPA, h_register_vpa);
     spapr_register_hypercall(H_CEDE, h_cede);
+    spapr_register_hypercall(H_PROD, h_prod);
+
     spapr_register_hypercall(H_SIGNAL_SYS_RESET, h_signal_sys_reset);
 
     /* processor register resource access h-calls */
-- 
2.20.1
Re: [Qemu-devel] [PATCH v5 2/4] spapr: Implement H_PROD
Posted by Cédric Le Goater 6 years, 6 months ago 
On 17/07/2019 07:39, Nicholas Piggin wrote:
> H_PROD is added, and H_CEDE is modified to test the prod bit
> according to PAPR.
> 
> Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
> ---
>  hw/ppc/spapr_hcall.c | 29 +++++++++++++++++++++++++++++
>  1 file changed, 29 insertions(+)
> 
> diff --git a/hw/ppc/spapr_hcall.c b/hw/ppc/spapr_hcall.c
> index e615881ac4..8b208ab259 100644
> --- a/hw/ppc/spapr_hcall.c
> +++ b/hw/ppc/spapr_hcall.c
> @@ -1050,14 +1050,41 @@ static target_ulong h_cede(PowerPCCPU *cpu, SpaprMachineState *spapr,
>  {
>      CPUPPCState *env = &cpu->env;
>      CPUState *cs = CPU(cpu);
> +    SpaprCpuState *spapr_cpu = spapr_cpu_state(cpu);
>  
>      env->msr |= (1ULL << MSR_EE);
>      hreg_compute_hflags(env);
> +
> +    if (spapr_cpu->prod) {
> +        spapr_cpu->prod = false;
> +        return H_SUCCESS;
> +    }
> +
>      if (!cpu_has_work(cs)) {
>          cs->halted = 1;
>          cs->exception_index = EXCP_HLT;

Shouldn't that be EXCP_HALTED instead ? 

commit 1dd088946cf4 seems to say that h_cede is equivalent to the hlt 
instruction on x86 but in 7 years things have changed.

C. 

>          cs->exit_request = 1;
>      }
> +
> +    return H_SUCCESS;
> +}
> +
> +static target_ulong h_prod(PowerPCCPU *cpu, SpaprMachineState *spapr,
> +                           target_ulong opcode, target_ulong *args)
> +{
> +    target_long target = args[0];
> +    CPUState *cs;
> +    SpaprCpuState *spapr_cpu = spapr_cpu_state(cpu);
> +
> +    cs = CPU(spapr_find_cpu(target));
> +    if (!cs) {
> +        return H_PARAMETER;
> +    }
> +
> +    spapr_cpu->prod = true;
> +    cs->halted = 0;
> +    qemu_cpu_kick(cs);
> +
>      return H_SUCCESS;
>  }
>  
> @@ -1882,6 +1909,8 @@ static void hypercall_register_types(void)
>      /* hcall-splpar */
>      spapr_register_hypercall(H_REGISTER_VPA, h_register_vpa);
>      spapr_register_hypercall(H_CEDE, h_cede);
> +    spapr_register_hypercall(H_PROD, h_prod);
> +
>      spapr_register_hypercall(H_SIGNAL_SYS_RESET, h_signal_sys_reset);
>  
>      /* processor register resource access h-calls */
>
Re: [Qemu-devel] [PATCH v5 2/4] spapr: Implement H_PROD
Posted by Nicholas Piggin 6 years, 6 months ago 
Cédric Le Goater's on July 17, 2019 11:33 pm:
> On 17/07/2019 07:39, Nicholas Piggin wrote:
>> H_PROD is added, and H_CEDE is modified to test the prod bit
>> according to PAPR.
>> 
>> Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
>> ---
>>  hw/ppc/spapr_hcall.c | 29 +++++++++++++++++++++++++++++
>>  1 file changed, 29 insertions(+)
>> 
>> diff --git a/hw/ppc/spapr_hcall.c b/hw/ppc/spapr_hcall.c
>> index e615881ac4..8b208ab259 100644
>> --- a/hw/ppc/spapr_hcall.c
>> +++ b/hw/ppc/spapr_hcall.c
>> @@ -1050,14 +1050,41 @@ static target_ulong h_cede(PowerPCCPU *cpu, SpaprMachineState *spapr,
>>  {
>>      CPUPPCState *env = &cpu->env;
>>      CPUState *cs = CPU(cpu);
>> +    SpaprCpuState *spapr_cpu = spapr_cpu_state(cpu);
>>  
>>      env->msr |= (1ULL << MSR_EE);
>>      hreg_compute_hflags(env);
>> +
>> +    if (spapr_cpu->prod) {
>> +        spapr_cpu->prod = false;
>> +        return H_SUCCESS;
>> +    }
>> +
>>      if (!cpu_has_work(cs)) {
>>          cs->halted = 1;
>>          cs->exception_index = EXCP_HLT;
> 
> Shouldn't that be EXCP_HALTED instead ? 

Possibly, I'm not sure. I don't know if it even makes a difference in
ppc code?

Thanks,
Nick
Re: [Qemu-devel] [PATCH v5 2/4] spapr: Implement H_PROD
Posted by Cédric Le Goater 6 years, 6 months ago 
On 17/07/2019 07:39, Nicholas Piggin wrote:
> H_PROD is added, and H_CEDE is modified to test the prod bit
> according to PAPR.
> 
> Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
> ---
>  hw/ppc/spapr_hcall.c | 29 +++++++++++++++++++++++++++++
>  1 file changed, 29 insertions(+)
> 
> diff --git a/hw/ppc/spapr_hcall.c b/hw/ppc/spapr_hcall.c
> index e615881ac4..8b208ab259 100644
> --- a/hw/ppc/spapr_hcall.c
> +++ b/hw/ppc/spapr_hcall.c
> @@ -1050,14 +1050,41 @@ static target_ulong h_cede(PowerPCCPU *cpu, SpaprMachineState *spapr,
>  {
>      CPUPPCState *env = &cpu->env;
>      CPUState *cs = CPU(cpu);
> +    SpaprCpuState *spapr_cpu = spapr_cpu_state(cpu);
>  
>      env->msr |= (1ULL << MSR_EE);
>      hreg_compute_hflags(env);
> +
> +    if (spapr_cpu->prod) {
> +        spapr_cpu->prod = false;
> +        return H_SUCCESS;
> +    }
> +
>      if (!cpu_has_work(cs)) {
>          cs->halted = 1;
>          cs->exception_index = EXCP_HLT;
>          cs->exit_request = 1;
>      }
> +
> +    return H_SUCCESS;
> +}
> +
> +static target_ulong h_prod(PowerPCCPU *cpu, SpaprMachineState *spapr,
> +                           target_ulong opcode, target_ulong *args)
> +{
> +    target_long target = args[0];
> +    CPUState *cs;
> +    SpaprCpuState *spapr_cpu = spapr_cpu_state(cpu);

shouldn't we grab the SpaprCpuState of 'target' instead ?  

> +    cs = CPU(spapr_find_cpu(target));
> +    if (!cs) {
> +        return H_PARAMETER;
> +    }
> +
> +    spapr_cpu->prod = true;
> +    cs->halted = 0;
> +    qemu_cpu_kick(cs);
> +
>      return H_SUCCESS;
>  }
>  
> @@ -1882,6 +1909,8 @@ static void hypercall_register_types(void)
>      /* hcall-splpar */
>      spapr_register_hypercall(H_REGISTER_VPA, h_register_vpa);
>      spapr_register_hypercall(H_CEDE, h_cede);
> +    spapr_register_hypercall(H_PROD, h_prod);
> +
>      spapr_register_hypercall(H_SIGNAL_SYS_RESET, h_signal_sys_reset);
>  
>      /* processor register resource access h-calls */
>
Re: [Qemu-devel] [PATCH v5 2/4] spapr: Implement H_PROD
Posted by Nicholas Piggin 6 years, 6 months ago 
Cédric Le Goater's on July 17, 2019 8:16 pm:
> On 17/07/2019 07:39, Nicholas Piggin wrote:
>> H_PROD is added, and H_CEDE is modified to test the prod bit
>> according to PAPR.
>> 
>> Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
>> ---
>>  hw/ppc/spapr_hcall.c | 29 +++++++++++++++++++++++++++++
>>  1 file changed, 29 insertions(+)
>> 
>> diff --git a/hw/ppc/spapr_hcall.c b/hw/ppc/spapr_hcall.c
>> index e615881ac4..8b208ab259 100644
>> --- a/hw/ppc/spapr_hcall.c
>> +++ b/hw/ppc/spapr_hcall.c
>> @@ -1050,14 +1050,41 @@ static target_ulong h_cede(PowerPCCPU *cpu, SpaprMachineState *spapr,
>>  {
>>      CPUPPCState *env = &cpu->env;
>>      CPUState *cs = CPU(cpu);
>> +    SpaprCpuState *spapr_cpu = spapr_cpu_state(cpu);
>>  
>>      env->msr |= (1ULL << MSR_EE);
>>      hreg_compute_hflags(env);
>> +
>> +    if (spapr_cpu->prod) {
>> +        spapr_cpu->prod = false;
>> +        return H_SUCCESS;
>> +    }
>> +
>>      if (!cpu_has_work(cs)) {
>>          cs->halted = 1;
>>          cs->exception_index = EXCP_HLT;
>>          cs->exit_request = 1;
>>      }
>> +
>> +    return H_SUCCESS;
>> +}
>> +
>> +static target_ulong h_prod(PowerPCCPU *cpu, SpaprMachineState *spapr,
>> +                           target_ulong opcode, target_ulong *args)
>> +{
>> +    target_long target = args[0];
>> +    CPUState *cs;
>> +    SpaprCpuState *spapr_cpu = spapr_cpu_state(cpu);
> 
> shouldn't we grab the SpaprCpuState of 'target' instead ?  

Yes we should, good catch.

Thanks,
Nick

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