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Re: [Xen-devel] [PATCH v2 1/2] x86: report use of PCID together with reporting XPTI status
- To: Jan Beulich <JBeulich@xxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Wed, 18 Jul 2018 15:47:30 +0100
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- Cc: xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Wed, 18 Jul 2018 14:48:10 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 18/07/18 10:19, Jan Beulich wrote:
>>>> On 18.07.18 at 10:46, <andrew.cooper3@xxxxxxxxxx> wrote:
>> On 18/07/2018 09:33, Jan Beulich wrote:
>>> --- a/xen/include/asm-x86/spec_ctrl.h
>>> +++ b/xen/include/asm-x86/spec_ctrl.h
>>> @@ -38,6 +38,8 @@ extern uint8_t opt_xpti;
>>> #define OPT_XPTI_DOM0 0x01
>>> #define OPT_XPTI_DOMU 0x02
>>>
>>> +bool xpti_pcid_enabled(void);
>> This still should be inside an CONFIG_PV to avoid scenarios which will
>> compile correctly but fail to link. It should live in pv/domain.h at
>> which point everything should be fine.
> It was intentional that I didn't move the declaration: Whether the build
> fails at the compile or link stage is irrelevant imo.
It is extremely relevant.
A compiler error points to the file/line here something is wrong, while
a linker error says "something somewhere went wrong", and grepping for
the symbol identified in the error won't be helpful for tracking down
the problem.
Furthermore, with CONFIG_PV not being a usable option yet, there is a
good chance of an error slipping in and going unnoticed until CONFIG_PV
can actually turned off.
> All we need is that it
> fail at all. I would have moved it if its current placement wasn't again
> very intentional, next to the other XPTI pieces.
You provided a reasonable justification for why the body of this
function should be in pv/domain.c Therefore, its declaration lives in
pv/domain.h
>
>> With that, Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
> Please clarify whether you can live with the above.
I'm not happy living with a linker error.
~Andrew
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