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Re: [PATCH v2 1/2] Fetch XSAVE area component offsets and sizes when initializing x86 CPU

On 05.06.2019 18:59, Paul Goyette wrote:
> On Wed, 5 Jun 2019, Kamil Rytarowski wrote:
>> On 05.06.2019 17:59, Paul Goyette wrote:
>>> An easier question:
>>> Does an old HAXM module still work correctly with a new kernel?  AND
>>> Does a new HAXM module still work correctly with an old kernel?
>> Actually HAXM does not use these structs but I propose to bump minor
>> number nonetheless as we want to keep kernel and modules (ptrace is a
>> module) synced.
> Yep.  If ptrace is a module, and it exchanges contents of the 'struct
> x86_fpu_save' with the kernel, then you need a bump.  Otherwise one
> might attempt to run a new kernel with old ptrace module, or old kernel
> with new ptrace module.

I've recommended to Michal to hold on with merging this into HEAD as a
last minute feature. We can wait for -9 branching and add it after the
branch. If it will work well with real applications such as gdb and
other debuggers (edb, ...) we can backport it to -9 before the NetBSD
9.0 release.

Keeping it longer on HEAD will give more flexibility with design changes
if needed.

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