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Re: [RFC PATCH] x86/svm: Use host_cpu_policy instead of open-coding cpuid
- To: Teddy Astie <teddy.astie@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 8 Dec 2025 16:19:08 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Jason Andryuk <jason.andryuk@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Mon, 08 Dec 2025 15:19:13 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 08.12.2025 15:58, Teddy Astie wrote:
> host_cpu_policy already fetched the SVM CPUIDs, use it instead of open-coding
> cpuid.
>
> Signed-off-by: Teddy Astie <teddy.astie@xxxxxxxxxx>
> ---
> It very likely doesn't work right now, as host_cpu_policy is not evaluated at
> this point
> (start_svm is unfortunately called before calculate_host_policy). So this is
> mostly a intent
> rather than something ready.
>
> There are also some other things I would like to improve on this, but not
> sure on the approach.
>
> It would be nice to move svm_feature_flags to host_cpu_policy, alike other
> bitmap-like leafs we have in cpu_policy. IOW move most of
> arch/x86/include/asm/hvm/svm/svm.h
> to cpu_policy infrastructure, which could also serve later for properly
> managing nested SVM
> features of a guest.
See https://lists.xen.org/archives/html/xen-devel/2024-06/msg01546.html
Jan
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