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Re: [for 4.22 v5 02/18] xen/riscv: introduce VMID allocation and manegement
- To: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 17 Nov 2025 09:35:18 +0100
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- Cc: Alistair Francis <alistair.francis@xxxxxxx>, Bob Eshleman <bobbyeshleman@xxxxxxxxx>, Connor Davis <connojdavis@xxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Mon, 17 Nov 2025 08:35:44 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 14.11.2025 10:27, Oleksii Kurochko wrote:
> On 11/6/25 3:05 PM, Jan Beulich wrote:
>> On 20.10.2025 17:57, Oleksii Kurochko wrote:
>>> +void vmid_flush_hart(void)
>>> +{
>>> + struct vmid_data *data = &this_cpu(vmid_data);
>>> +
>>> + if ( !data->used )
>>> + return;
>>> +
>>> + if ( likely(++data->generation != 0) )
>>> + return;
>>> +
>>> + /*
>>> + * VMID generations are 64 bit. Overflow of generations never happens.
>>> + * For safety, we simply disable ASIDs, so correctness is established;
>>> it
>>> + * only runs a bit slower.
>>> + */
>>> + printk("%s: VMID generation overrun. Disabling VMIDs.\n", __func__);
>> Is logging of the function name of any value here?
>
> Agree, there is no any sense for the logging of the function name.
>
>> Also, despite the x86
>> original havinbg it like this - generally no full stops please if log
>> messages. "VMID generation overrun; disabling VMIDs\n" would do.
>
> Sure, I will drop it and will try to not add it in such cases. But could you
> please remind (if I asked that before) me what is the reason why full stop
> shouldn't be presented in such cases?
First: Consistency across the code base. Second: Meaningless characters
needlessly consume serial line bandwidth.
Jan
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