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Re: [XEN][PATCH 3/5] x86: hvm: factor out compat code under ifdefs
- To: Grygorii Strashko <grygorii_strashko@xxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 13 Nov 2025 14:23:06 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Alejandro Vallejo <alejandro.garciavallejo@xxxxxxx>, Jason Andryuk <jason.andryuk@xxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>
- Delivery-date: Thu, 13 Nov 2025 13:23:18 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 13.11.2025 14:18, Grygorii Strashko wrote:
> On 13.11.25 14:30, Jan Beulich wrote:
>> On 11.11.2025 18:54, Grygorii Strashko wrote:
>>> --- a/xen/arch/x86/hvm/hypercall.c
>>> +++ b/xen/arch/x86/hvm/hypercall.c
>>> @@ -29,10 +29,12 @@ long hvm_memory_op(unsigned long cmd,
>>> XEN_GUEST_HANDLE_PARAM(void) arg)
>>> return -ENOSYS;
>>> }
>>>
>>> - if ( !vcpu_is_hcall_compat(current) )
>>> - rc = do_memory_op(cmd, arg);
>>> - else
>>> +#ifdef CONFIG_COMPAT
>>> + if ( vcpu_is_hcall_compat(current) )
>>> rc = compat_memory_op(cmd, arg);
>>> + else
>>> +#endif
>>> + rc = do_memory_op(cmd, arg);
>>
>> Why would this be needed when vcpu_is_hcall_compat() already honors
>> CONFIG_COMPAT?
>> (Same question then applies elsewhere, of course.)
>
> This I do not like by myself, but I was not able to find other options :(
>
> hypercall-defs.h is autogenerated and it's the only one place where functions
> declarations like do_x_op() are appeared or disappeared.
> So build is failing without ifdefs as compiler can't find compat_memory_op()
> declaration.
Oh, I see; I hadn't thought of that aspect. I wonder if we wouldn't better take
care of that in the machinery there. Cc-ing Jürgen, who did introduce this
originally. Maybe he has concrete arguments against us doing so.
Jan
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