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Re: [PATCH v2] SUPPORT.md: Un-shimmed 32-bit PV guests are no longer supported

  • To: George Dunlap <george.dunlap@xxxxxxxxxx>, Ian Jackson <iwj@xxxxxxxxxxxxxx>
  • From: Jan Beulich <jbeulich@xxxxxxxx>
  • Date: Mon, 7 Jun 2021 11:18:01 +0200
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  • Delivery-date: Mon, 07 Jun 2021 09:18:18 +0000
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On 06.05.2021 14:47, George Dunlap wrote:
> --- a/xen/arch/x86/Kconfig
> +++ b/xen/arch/x86/Kconfig
> @@ -55,7 +55,7 @@ config PV
>  config PV32
>       bool "Support for 32bit PV guests"
>       depends on PV
> -     default y
> +     default PV_SHIM
>       select COMPAT
>       ---help---
>         The 32bit PV ABI uses Ring1, an area of the x86 architecture which

The tool stack side change that Jürgen has just sent will only address
the smoke test side of the resulting fallout. Unless steps get taken to
continue to build Xen with PV32=y in osstest (despite the changed
default), I expect many (all?) of the test-amd64-i386-* to then fail
when doing a full flight, as otherwise a 32-bit Dom0 then also won't be
usable anymore. Of course I think I recall the question having got
raised in the past whether the 32-bit Dom0 testing shouldn't be dropped
at some point. Yet even then I suppose some 32-bit DomU testing would
still want keeping, which still would require a PV32=y hypervisor.

I guess we want to postpone backporting until that is sorted.




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