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Re: [PATCH v20210616 00/36] leftover from 2020
- To: Olaf Hering <olaf@xxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Thu, 17 Jun 2021 16:05:39 +0100
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- Cc: <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Thu, 17 Jun 2021 15:05:53 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 17/06/2021 15:55, Olaf Hering wrote:
> Am Thu, 17 Jun 2021 12:24:22 +0100
> schrieb Andrew Cooper <andrew.cooper3@xxxxxxxxxx>:
>
>> On 16/06/2021 16:38, Olaf Hering wrote:
>>> Am Wed, 16 Jun 2021 15:50:24 +0100
>>> schrieb Andrew Cooper <andrew.cooper3@xxxxxxxxxx>:
>>>
>>>> 32bit toolstack build
>>> as in i386?
>>> How is this used in practice?
>> Every OSSTest run.
> This is not what I mean.
> I think there is a 32bit xen-tools, a 32bit dom0 kernel and a 64bit Xen?
Yes - this exists.
> Is 32bit xen-tools, 64bit dom0 kernel and 64bit Xen expected to work?
In an ideal world, yes. In reality, no.
Lots of hypercalls have embedded pointers (every GUEST_HANDLE(), to a
first approximation), and dom0's ABI with Xen is 64bit, which is not the
ABI that 32bit userspace speaks.
This is one of many errors in the hypercall design intending to be
addressed by the ABIv2 plans.
~Andrew
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