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Re: [XEN PATCH v2 13/15] x86/ioreq: guard VIO_realmode_completion with CONFIG_VMX
- To: Sergiy Kibrik <sergiy_kibrik@xxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Fri, 31 May 2024 10:31:18 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Xenia Ragiadakou <xenia.ragiadakou@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Fri, 31 May 2024 08:31:24 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 31.05.2024 10:05, Sergiy Kibrik wrote:
> 16.05.24 15:11, Jan Beulich:
>> On 15.05.2024 11:24, Sergiy Kibrik wrote:
>>> --- a/xen/arch/x86/hvm/emulate.c
>>> +++ b/xen/arch/x86/hvm/emulate.c
>>> @@ -2667,7 +2667,9 @@ static int _hvm_emulate_one(struct hvm_emulate_ctxt
>>> *hvmemul_ctxt,
>>> break;
>>>
>>> case VIO_mmio_completion:
>>> +#ifdef CONFIG_VMX
>>> case VIO_realmode_completion:
>>> +#endif
>>> BUILD_BUG_ON(sizeof(hvio->mmio_insn) <
>>> sizeof(hvmemul_ctxt->insn_buf));
>>> hvio->mmio_insn_bytes = hvmemul_ctxt->insn_buf_bytes;
>>> memcpy(hvio->mmio_insn, hvmemul_ctxt->insn_buf,
>>> hvio->mmio_insn_bytes);
>>
>> This change doesn't buy us anything, does it?
>
> why not? Code won't compile w/o it.
> Or do you mean hiding the whole VIO_realmode_completion enum under
> CONFIG_VMX wasn't really useful?
That's what I meant, by implication. To me it's extra #ifdef-ary without
real gain.
Jan
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