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Re: [PATCH 4/4] arch/domain: Clean up the idle domain remnants in arch_domain_create()
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 23 Jul 2024 08:38:33 +0200
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- Cc: Roger Pau Monné <roger.pau@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Tue, 23 Jul 2024 06:38:39 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 22.07.2024 19:46, Andrew Cooper wrote:
> On 22/07/2024 8:23 am, Jan Beulich wrote:
>> On 18.07.2024 23:57, Andrew Cooper wrote:
>>> --- a/xen/arch/x86/domain.c
>>> +++ b/xen/arch/x86/domain.c
>>> @@ -791,23 +791,6 @@ int arch_domain_create(struct domain *d,
>>>
>>> spin_lock_init(&d->arch.e820_lock);
>>>
>>> - /* Minimal initialisation for the idle domain. */
>>> - if ( unlikely(is_idle_domain(d)) )
>>> - {
>>> - arch_init_idle_domain(d);
>>> -
>>> - d->arch.cpu_policy = ZERO_BLOCK_PTR; /* Catch stray misuses. */
>> This line looks to be lost in the process. Already in an earlier patch it
>> should move to arch_init_idle_domain(), shouldn't it? With that adjustment
>> for the entire series:
>> Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
>
> It was semi-intentional. cpu_policy is just one of many pointers, and I
> don't see a good reason for it to be treated specially.
>
> It's been around for years now, and never one triggered, not to mention
> the fact that there's a dwindling set of machines where a dereference of
> 0 isn't instantly fatal anyway.
Okay, yet would you mind mentioning this removal as intentional then in
the description?
Jan
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