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Re: [PATCH v2 1/8] x86/xen/pv: Don't setup runstate area too early
- To: Teddy Astie <teddy.astie@xxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- From: Juergen Gross <jgross@xxxxxxxx>
- Date: Wed, 11 Nov 2026 08:44:28 +0100
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- Cc: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>, David Woodhouse <dwmw2@xxxxxxxxxxxxx>, x86@xxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
- Delivery-date: Wed, 11 Nov 2026 07:44:33 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 19.10.26 11:20, Teddy Astie wrote:
Le 16/10/2026 à 19:34, Andrew Cooper a écrit :
On 16/10/2026 6:06 pm, Teddy Astie wrote:
This is no longer required since [1].
At this moment of boot, per_cpu areas are not initialized, which prevents
using VCPUOP_register_runstate_phys_area as per_cpu_ptr_to_phys() would
misbehave in this case.
This isn't really correct.
The per-cpu area for the BSP is within the main image, which is why the
logic functions today. What's missing is the call to
pcpu_setup_first_chunk() which tells per_cpu_ptr_to_phys() about where
the BSP data is.
I think you want to say:
"A future change wants to use per_cpu_ptr_to_phys() in
xen_setup_runstate_info(), but this call is too early. It turns out to
be no longer required since ..."
Right, I was thinking that the use of the per_cpu was incorrect at this point.
But that's not exactly the issue here.
Will adjust for the v3.
With the suggested wording above:
Reviewed-by: Juergen Gross <jgross@xxxxxxxx>
Juergen
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