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Re: [PATCH v1 1/5] console: add relocation hook
- To: Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 5 Jun 2025 16:42:53 +0200
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- Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Delivery-date: Thu, 05 Jun 2025 14:43:12 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 26.05.2025 17:39, Marek Marczykowski-Górecki wrote:
> On Mon, May 26, 2025 at 04:08:17PM +0100, Andrew Cooper wrote:
>> On 25/05/2025 3:15 pm, Marek Marczykowski-Górecki wrote:
>>> diff --git a/xen/arch/x86/setup.c b/xen/arch/x86/setup.c
>>> index 25189541244d..3ef819a252e4 100644
>>> --- a/xen/arch/x86/setup.c
>>> +++ b/xen/arch/x86/setup.c
>>> @@ -1481,6 +1481,8 @@ void asmlinkage __init noreturn __start_xen(void)
>>> highmem_start &= ~((1UL << L3_PAGETABLE_SHIFT) - 1);
>>> #endif
>>>
>>> + console_init_pre_relocate();
>>> +
>>> /*
>>> * Iterate backwards over all superpage-aligned RAM regions.
>>> *
>>> @@ -1606,6 +1608,12 @@ void asmlinkage __init noreturn __start_xen(void)
>>> if ( !xen_phys_start )
>>> panic("Not enough memory to relocate Xen\n");
>>>
>>> + /*
>>> + * Notify console drivers about relocation, before reusing old Xen's
>>> + * memory.
>>> + */
>>> + console_init_post_relocate();
>>> +
>>
>> With reference to the next patch, there are printk()'s in this region
>> which want to work (in case something goes very wrong), so I don't think
>> setting dbc->suspended is the best approach.
>
> I guess the post_relocate hook might be moved a bit earlier, but still,
> once relocation happens, the xhci console is not functional until it
> gets relocated too (for example - it would post new TRBs into a ring
> that isn't actually monitored by the controller).
Why is it that this ring is dependent upon Xen's position? If the ring was
dynamically allocated, it wouldn't change position when Xen is moved.
Jan
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