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Re: Xen 4.18 pvshim console issue (with patch)


  • To: Manuel Bouyer <bouyer@xxxxxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, Henry Wang <Henry.Wang@xxxxxxx>
  • From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
  • Date: Wed, 18 Oct 2023 11:44:22 +0100
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  • Delivery-date: Wed, 18 Oct 2023 10:44:26 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

On 18/10/2023 11:38 am, Manuel Bouyer wrote:
> Hello,
> With Xen 4.18, a PV domain running under pvshim doesn't get console input.
> This is because the domain id in pvshim isn't 0 (and on x86 max_init_domid is
> hardwired to 0), so console_input_domain() will never select that domain
> as input.
> 
> The attached patch fixes it by translating 0 to the real domain id for
> pvshim, but there may be a better way to do this.
> 

Thankyou for the report.

First, CC'ing Henry as 4.18 release manager.

There have been changes in how this works recently in 4.18, notably c/s
c2581c58bec96.

However, it's not obvious whether this worked in 4.17 or not.  i.e.
whether it's a regression in 4.18, or whether it's been broken since PV
Shim was introduced.

~Andrew



 


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