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[PATCH] hvf: remove unused but set variable

Pierrick Bouvier posted 1 patch 1 month ago 
target/i386/hvf/x86_task.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
[PATCH] hvf: remove unused but set variable
Posted by Pierrick Bouvier 1 month ago 
fixes associated warning when building on MacOS.

Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
---
 target/i386/hvf/x86_task.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/target/i386/hvf/x86_task.c b/target/i386/hvf/x86_task.c
index f09bfbdda5b..cdea2ea69d9 100644
--- a/target/i386/hvf/x86_task.c
+++ b/target/i386/hvf/x86_task.c
@@ -122,7 +122,6 @@ void vmx_handle_task_switch(CPUState *cpu, x68_segment_selector tss_sel, int rea
     load_regs(cpu);
 
     struct x86_segment_descriptor curr_tss_desc, next_tss_desc;
-    int ret;
     x68_segment_selector old_tss_sel = vmx_read_segment_selector(cpu, R_TR);
     uint64_t old_tss_base = vmx_read_segment_base(cpu, R_TR);
     uint32_t desc_limit;
@@ -138,7 +137,7 @@ void vmx_handle_task_switch(CPUState *cpu, x68_segment_selector tss_sel, int rea
     if (reason == TSR_IDT_GATE && gate_valid) {
         int dpl;
 
-        ret = x86_read_call_gate(cpu, &task_gate_desc, gate);
+        x86_read_call_gate(cpu, &task_gate_desc, gate);
 
         dpl = task_gate_desc.dpl;
         x68_segment_selector cs = vmx_read_segment_selector(cpu, R_CS);
@@ -167,11 +166,12 @@ void vmx_handle_task_switch(CPUState *cpu, x68_segment_selector tss_sel, int rea
         x86_write_segment_descriptor(cpu, &next_tss_desc, tss_sel);
     }
 
-    if (next_tss_desc.type & 8)
-        ret = task_switch_32(cpu, tss_sel, old_tss_sel, old_tss_base, &next_tss_desc);
-    else
+    if (next_tss_desc.type & 8) {
+        task_switch_32(cpu, tss_sel, old_tss_sel, old_tss_base, &next_tss_desc);
+    } else {
         //ret = task_switch_16(cpu, tss_sel, old_tss_sel, old_tss_base, &next_tss_desc);
         VM_PANIC("task_switch_16");
+    }
 
     macvm_set_cr0(cpu->accel->fd, rvmcs(cpu->accel->fd, VMCS_GUEST_CR0) |
                                 CR0_TS_MASK);
-- 
2.39.5
Re: [PATCH] hvf: remove unused but set variable
Posted by Paolo Bonzini 3 days, 23 hours ago 
Queued, thanks.

Paolo
Re: [PATCH] hvf: remove unused but set variable
Posted by Pierrick Bouvier 2 days, 23 hours ago 
On 11/19/24 09:34, Paolo Bonzini wrote:
> Queued, thanks.
> 
> Paolo
> 

Thanks for pulling it Paolo.
Re: [PATCH] hvf: remove unused but set variable
Posted by Pierrick Bouvier 4 days, 19 hours ago 
On 10/23/24 11:29, Pierrick Bouvier wrote:
> fixes associated warning when building on MacOS.
> 
> Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
> ---
>   target/i386/hvf/x86_task.c | 10 +++++-----
>   1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/target/i386/hvf/x86_task.c b/target/i386/hvf/x86_task.c
> index f09bfbdda5b..cdea2ea69d9 100644
> --- a/target/i386/hvf/x86_task.c
> +++ b/target/i386/hvf/x86_task.c
> @@ -122,7 +122,6 @@ void vmx_handle_task_switch(CPUState *cpu, x68_segment_selector tss_sel, int rea
>       load_regs(cpu);
>   
>       struct x86_segment_descriptor curr_tss_desc, next_tss_desc;
> -    int ret;
>       x68_segment_selector old_tss_sel = vmx_read_segment_selector(cpu, R_TR);
>       uint64_t old_tss_base = vmx_read_segment_base(cpu, R_TR);
>       uint32_t desc_limit;
> @@ -138,7 +137,7 @@ void vmx_handle_task_switch(CPUState *cpu, x68_segment_selector tss_sel, int rea
>       if (reason == TSR_IDT_GATE && gate_valid) {
>           int dpl;
>   
> -        ret = x86_read_call_gate(cpu, &task_gate_desc, gate);
> +        x86_read_call_gate(cpu, &task_gate_desc, gate);
>   
>           dpl = task_gate_desc.dpl;
>           x68_segment_selector cs = vmx_read_segment_selector(cpu, R_CS);
> @@ -167,11 +166,12 @@ void vmx_handle_task_switch(CPUState *cpu, x68_segment_selector tss_sel, int rea
>           x86_write_segment_descriptor(cpu, &next_tss_desc, tss_sel);
>       }
>   
> -    if (next_tss_desc.type & 8)
> -        ret = task_switch_32(cpu, tss_sel, old_tss_sel, old_tss_base, &next_tss_desc);
> -    else
> +    if (next_tss_desc.type & 8) {
> +        task_switch_32(cpu, tss_sel, old_tss_sel, old_tss_base, &next_tss_desc);
> +    } else {
>           //ret = task_switch_16(cpu, tss_sel, old_tss_sel, old_tss_base, &next_tss_desc);
>           VM_PANIC("task_switch_16");
> +    }
>   
>       macvm_set_cr0(cpu->accel->fd, rvmcs(cpu->accel->fd, VMCS_GUEST_CR0) |
>                                   CR0_TS_MASK);

Gentle ping on this patch, hopefully it could be merged for 9.2.
Re: [PATCH] hvf: remove unused but set variable
Posted by Alex Bennée 1 month ago 
Pierrick Bouvier <pierrick.bouvier@linaro.org> writes:

> fixes associated warning when building on MacOS.
>
> Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
> ---
>  target/i386/hvf/x86_task.c | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/target/i386/hvf/x86_task.c b/target/i386/hvf/x86_task.c
> index f09bfbdda5b..cdea2ea69d9 100644
> --- a/target/i386/hvf/x86_task.c
> +++ b/target/i386/hvf/x86_task.c
> @@ -122,7 +122,6 @@ void vmx_handle_task_switch(CPUState *cpu, x68_segment_selector tss_sel, int rea
>      load_regs(cpu);
>  
>      struct x86_segment_descriptor curr_tss_desc, next_tss_desc;
> -    int ret;
>      x68_segment_selector old_tss_sel = vmx_read_segment_selector(cpu, R_TR);
>      uint64_t old_tss_base = vmx_read_segment_base(cpu, R_TR);
>      uint32_t desc_limit;
> @@ -138,7 +137,7 @@ void vmx_handle_task_switch(CPUState *cpu, x68_segment_selector tss_sel, int rea
>      if (reason == TSR_IDT_GATE && gate_valid) {
>          int dpl;
>  
> -        ret = x86_read_call_gate(cpu, &task_gate_desc, gate);
> +        x86_read_call_gate(cpu, &task_gate_desc, gate);

If we don't care and this is the only caller we fix up
x86_read_call_gate not to return a value. It looks like it fails safe
with an empty entry (but also the function x86_read_call_gate needs the
printf removing).

>  
>          dpl = task_gate_desc.dpl;
>          x68_segment_selector cs = vmx_read_segment_selector(cpu, R_CS);
> @@ -167,11 +166,12 @@ void vmx_handle_task_switch(CPUState *cpu, x68_segment_selector tss_sel, int rea
>          x86_write_segment_descriptor(cpu, &next_tss_desc, tss_sel);
>      }
>  
> -    if (next_tss_desc.type & 8)
> -        ret = task_switch_32(cpu, tss_sel, old_tss_sel, old_tss_base, &next_tss_desc);
> -    else
> +    if (next_tss_desc.type & 8) {
> +        task_switch_32(cpu, tss_sel, old_tss_sel, old_tss_base, &next_tss_desc);
> +    } else {
>          //ret = task_switch_16(cpu, tss_sel, old_tss_sel, old_tss_base, &next_tss_desc);
>          VM_PANIC("task_switch_16");
> +    }
>  
>      macvm_set_cr0(cpu->accel->fd, rvmcs(cpu->accel->fd, VMCS_GUEST_CR0) |
>                                  CR0_TS_MASK);

-- 
Alex Bennée
Virtualisation Tech Lead @ Linaro
Re: [PATCH] hvf: remove unused but set variable
Posted by Pierrick Bouvier 1 month ago 
On 10/23/24 12:53, Alex Bennée wrote:
> Pierrick Bouvier <pierrick.bouvier@linaro.org> writes:
> 
>> fixes associated warning when building on MacOS.
>>
>> Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
>> ---
>>   target/i386/hvf/x86_task.c | 10 +++++-----
>>   1 file changed, 5 insertions(+), 5 deletions(-)
>>
>> diff --git a/target/i386/hvf/x86_task.c b/target/i386/hvf/x86_task.c
>> index f09bfbdda5b..cdea2ea69d9 100644
>> --- a/target/i386/hvf/x86_task.c
>> +++ b/target/i386/hvf/x86_task.c
>> @@ -122,7 +122,6 @@ void vmx_handle_task_switch(CPUState *cpu, x68_segment_selector tss_sel, int rea
>>       load_regs(cpu);
>>   
>>       struct x86_segment_descriptor curr_tss_desc, next_tss_desc;
>> -    int ret;
>>       x68_segment_selector old_tss_sel = vmx_read_segment_selector(cpu, R_TR);
>>       uint64_t old_tss_base = vmx_read_segment_base(cpu, R_TR);
>>       uint32_t desc_limit;
>> @@ -138,7 +137,7 @@ void vmx_handle_task_switch(CPUState *cpu, x68_segment_selector tss_sel, int rea
>>       if (reason == TSR_IDT_GATE && gate_valid) {
>>           int dpl;
>>   
>> -        ret = x86_read_call_gate(cpu, &task_gate_desc, gate);
>> +        x86_read_call_gate(cpu, &task_gate_desc, gate);
> 
> If we don't care and this is the only caller we fix up
> x86_read_call_gate not to return a value. It looks like it fails safe
> with an empty entry (but also the function x86_read_call_gate needs the
> printf removing).
> 
Yes, or maybe we should check if the read was a success, or else call 
VM_PANIC("x86_read_call_gate").
Any advice from hvf maintainers?

>>   
>>           dpl = task_gate_desc.dpl;
>>           x68_segment_selector cs = vmx_read_segment_selector(cpu, R_CS);
>> @@ -167,11 +166,12 @@ void vmx_handle_task_switch(CPUState *cpu, x68_segment_selector tss_sel, int rea
>>           x86_write_segment_descriptor(cpu, &next_tss_desc, tss_sel);
>>       }
>>   
>> -    if (next_tss_desc.type & 8)
>> -        ret = task_switch_32(cpu, tss_sel, old_tss_sel, old_tss_base, &next_tss_desc);
>> -    else
>> +    if (next_tss_desc.type & 8) {
>> +        task_switch_32(cpu, tss_sel, old_tss_sel, old_tss_base, &next_tss_desc);
>> +    } else {
>>           //ret = task_switch_16(cpu, tss_sel, old_tss_sel, old_tss_base, &next_tss_desc);
>>           VM_PANIC("task_switch_16");
>> +    }
>>   
>>       macvm_set_cr0(cpu->accel->fd, rvmcs(cpu->accel->fd, VMCS_GUEST_CR0) |
>>                                   CR0_TS_MASK);
>
Re: [PATCH] hvf: remove unused but set variable
Posted by Pierrick Bouvier 2 weeks, 4 days ago 
On 10/23/24 13:04, Pierrick Bouvier wrote:
> On 10/23/24 12:53, Alex Bennée wrote:
>> Pierrick Bouvier <pierrick.bouvier@linaro.org> writes:
>>
>>> fixes associated warning when building on MacOS.
>>>
>>> Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
>>> ---
>>>    target/i386/hvf/x86_task.c | 10 +++++-----
>>>    1 file changed, 5 insertions(+), 5 deletions(-)
>>>
>>> diff --git a/target/i386/hvf/x86_task.c b/target/i386/hvf/x86_task.c
>>> index f09bfbdda5b..cdea2ea69d9 100644
>>> --- a/target/i386/hvf/x86_task.c
>>> +++ b/target/i386/hvf/x86_task.c
>>> @@ -122,7 +122,6 @@ void vmx_handle_task_switch(CPUState *cpu, x68_segment_selector tss_sel, int rea
>>>        load_regs(cpu);
>>>    
>>>        struct x86_segment_descriptor curr_tss_desc, next_tss_desc;
>>> -    int ret;
>>>        x68_segment_selector old_tss_sel = vmx_read_segment_selector(cpu, R_TR);
>>>        uint64_t old_tss_base = vmx_read_segment_base(cpu, R_TR);
>>>        uint32_t desc_limit;
>>> @@ -138,7 +137,7 @@ void vmx_handle_task_switch(CPUState *cpu, x68_segment_selector tss_sel, int rea
>>>        if (reason == TSR_IDT_GATE && gate_valid) {
>>>            int dpl;
>>>    
>>> -        ret = x86_read_call_gate(cpu, &task_gate_desc, gate);
>>> +        x86_read_call_gate(cpu, &task_gate_desc, gate);
>>
>> If we don't care and this is the only caller we fix up
>> x86_read_call_gate not to return a value. It looks like it fails safe
>> with an empty entry (but also the function x86_read_call_gate needs the
>> printf removing).
>>
> Yes, or maybe we should check if the read was a success, or else call
> VM_PANIC("x86_read_call_gate").
> Any advice from hvf maintainers?
> 

We didn't have any feedback yet.

Would that be possible for a maintainer to pull the current series as it is?
It's functionnally equivalent, and remove this warning to have a clean 
9.2 release on this platform.

>>>    
>>>            dpl = task_gate_desc.dpl;
>>>            x68_segment_selector cs = vmx_read_segment_selector(cpu, R_CS);
>>> @@ -167,11 +166,12 @@ void vmx_handle_task_switch(CPUState *cpu, x68_segment_selector tss_sel, int rea
>>>            x86_write_segment_descriptor(cpu, &next_tss_desc, tss_sel);
>>>        }
>>>    
>>> -    if (next_tss_desc.type & 8)
>>> -        ret = task_switch_32(cpu, tss_sel, old_tss_sel, old_tss_base, &next_tss_desc);
>>> -    else
>>> +    if (next_tss_desc.type & 8) {
>>> +        task_switch_32(cpu, tss_sel, old_tss_sel, old_tss_base, &next_tss_desc);
>>> +    } else {
>>>            //ret = task_switch_16(cpu, tss_sel, old_tss_sel, old_tss_base, &next_tss_desc);
>>>            VM_PANIC("task_switch_16");
>>> +    }
>>>    
>>>        macvm_set_cr0(cpu->accel->fd, rvmcs(cpu->accel->fd, VMCS_GUEST_CR0) |
>>>                                    CR0_TS_MASK);
>>
Re: [PATCH] hvf: remove unused but set variable
Posted by Richard Henderson 1 month ago 
On 10/23/24 11:29, Pierrick Bouvier wrote:
> fixes associated warning when building on MacOS.
> 
> Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
> ---
>   target/i386/hvf/x86_task.c | 10 +++++-----
>   1 file changed, 5 insertions(+), 5 deletions(-)

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>


r~
> 
> diff --git a/target/i386/hvf/x86_task.c b/target/i386/hvf/x86_task.c
> index f09bfbdda5b..cdea2ea69d9 100644
> --- a/target/i386/hvf/x86_task.c
> +++ b/target/i386/hvf/x86_task.c
> @@ -122,7 +122,6 @@ void vmx_handle_task_switch(CPUState *cpu, x68_segment_selector tss_sel, int rea
>       load_regs(cpu);
>   
>       struct x86_segment_descriptor curr_tss_desc, next_tss_desc;
> -    int ret;
>       x68_segment_selector old_tss_sel = vmx_read_segment_selector(cpu, R_TR);
>       uint64_t old_tss_base = vmx_read_segment_base(cpu, R_TR);
>       uint32_t desc_limit;
> @@ -138,7 +137,7 @@ void vmx_handle_task_switch(CPUState *cpu, x68_segment_selector tss_sel, int rea
>       if (reason == TSR_IDT_GATE && gate_valid) {
>           int dpl;
>   
> -        ret = x86_read_call_gate(cpu, &task_gate_desc, gate);
> +        x86_read_call_gate(cpu, &task_gate_desc, gate);
>   
>           dpl = task_gate_desc.dpl;
>           x68_segment_selector cs = vmx_read_segment_selector(cpu, R_CS);
> @@ -167,11 +166,12 @@ void vmx_handle_task_switch(CPUState *cpu, x68_segment_selector tss_sel, int rea
>           x86_write_segment_descriptor(cpu, &next_tss_desc, tss_sel);
>       }
>   
> -    if (next_tss_desc.type & 8)
> -        ret = task_switch_32(cpu, tss_sel, old_tss_sel, old_tss_base, &next_tss_desc);
> -    else
> +    if (next_tss_desc.type & 8) {
> +        task_switch_32(cpu, tss_sel, old_tss_sel, old_tss_base, &next_tss_desc);
> +    } else {
>           //ret = task_switch_16(cpu, tss_sel, old_tss_sel, old_tss_base, &next_tss_desc);
>           VM_PANIC("task_switch_16");
> +    }
>   
>       macvm_set_cr0(cpu->accel->fd, rvmcs(cpu->accel->fd, VMCS_GUEST_CR0) |
>                                   CR0_TS_MASK);

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