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Re: xentrace buffer size, maxcpus and online cpus
- To: Olaf Hering <olaf@xxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Mon, 19 Jun 2023 12:14:21 +0100
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- Cc: George Dunlap <george.dunlap@xxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, Juergen Gross <jgross@xxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>
- Delivery-date: Mon, 19 Jun 2023 11:14:56 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 19/06/2023 11:16 am, Olaf Hering wrote:
> Fri, 16 Jun 2023 17:08:25 +0100 Andrew Cooper <andrew.cooper3@xxxxxxxxxx>:
>
>> XENMEM_acquire_resource is a new mapping interface with far more sane
>> semantics which, amongst other things, will work in PVH guests too.
> Does that indicate xentrace will not work in a PVH dom0?
To the best of my knowledge, it does not right now.
I seem to recall that ARM did some bodge to make it work for them, as
all guests are effectively PVH, but I don't recall exactly what that was.
> I will have a look how XENMEM_acquire_resource is used in other places.
> The resulting change will likely be too intrusive for 4.18.
It shouldn't be too bad IMO, but it's not the end of the world if it
falls into 4.19.
~Andrew
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