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Re: [Xen-devel] [PATCH v2] x86/pv: Fix construction of 32bit dom0's


  • To: Jan Beulich <JBeulich@xxxxxxxx>, Wei Liu <wei.liu2@xxxxxxxxxx>
  • From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
  • Date: Thu, 14 Feb 2019 12:02:36 +0000
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  • Cc: xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Roger Pau Monne <roger.pau@xxxxxxxxxx>
  • Delivery-date: Thu, 14 Feb 2019 12:02:42 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
  • Openpgp: preference=signencrypt

On 14/02/2019 12:01, Jan Beulich wrote:
>>>> On 14.02.19 at 12:54, <wei.liu2@xxxxxxxxxx> wrote:
>> On Thu, Feb 14, 2019 at 04:49:21AM -0700, Jan Beulich wrote:
>>>>>> On 14.02.19 at 12:10, <wei.liu2@xxxxxxxxxx> wrote:
>>>> From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
>>>>
>>>> dom0_construct_pv() has logic to transition dom0 into a compat domain when
>>>> booting an ELF32 image.
>>>>
>>>> One aspect which is missing is the CPUID policy recalculation, meaning 
>>>> that a
>>>> 32bit dom0 sees a 64bit policy, which differ by the Long Mode feature flag 
>>>> in
>>>> particular.  Another missing item is the x87_fip_width initialisation.
>>>>
>>>> Update dom0_construct_pv() to use switch_compat(), rather than retaining 
>>>> the
>>>> opencoding.  Position the call to switch_compat() such that the compat32 
>>>> local
>>>> variable can disappear entirely.
>>>>
>>>> The 32bit monitor table is now created by setup_compat_l4(), avoiding the 
>>>> need
>>>> to for manual creation later.  Furthermore, the L3 table creation is 
>>>> redundant
>>>> with the logic inside the main mapping loop, so can be dropped as well.
>>> This last sentence is no longer applicable afaict.
>> Good catch.
>>
>> I think the subject line also needs fixing. It should read:
>>
>>     x86/pv: Fix construction of 32bit dom0
>>
>> i.e. the possessive form is wrong.
> Perhaps. I was under the impression that Andrew meant plural.

I did, because in practice this is "fix running 32bit PV XTF tests when
your working on Xen in PVH mode".

~Andrew

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