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Re: [PATCH v2 1/5] xen/version: Drop bogus return values for XENVER_platform_parameters
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 16 Jan 2023 16:36:06 +0100
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- Cc: George Dunlap <George.Dunlap@xxxxxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Mon, 16 Jan 2023 15:36:14 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 14.01.2023 00:08, Andrew Cooper wrote:
> A split in virtual address space is only applicable for x86 PV guests.
> Furthermore, the information returned for x86 64bit PV guests is wrong.
>
> Explain the problem in version.h, stating the other information that PV guests
> need to know.
>
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
> The only reason this does not get an XSA is because Xen does not have any form
> of KALSR.
I continue to question this. I think I did say before that even with KASLR Xen
would need to constrain itself to the 16 L4 slots that the ABI reserves for
its purpose. And nothing is being returned about the inner structure of that
virtual address range.
Jan
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