Re: [PATCH v3 for-4.22] x86/cpu-policy: set up host policy earlier

Teddy Astie <[email protected]> Wed, 29 Jul 2026 16:21:39 +0200
Newsgroups gmane.comp.emulators.xen.devel
Message-ID <1785334901.8631fc262581453bbf619ec5b2062170.19fae40a900000e099@vates.tech>
Le 08/07/2026 à 16:55, Jan Beulich a écrit :
> In order to use cpu_has_* expanding to host_cpu_policy.*, the host policy
> needs setting up alongside boot_cpu_data.x86_capability[]. Arrange for
> that towards the end of identify_cpu(). Then make sure .x86_capability[]
> and host policy remain in sync when setup_{force,clear}_cpu_cap() are
> used.
> 
> Rename the function now it's no longer static.
> 
> Fixes: 894bd7617924 ("x86/Intel: use host CPU policy for ARAT checking")
> Reported-by: Marek Marczykowski-Górecki <[email protected]>
> Signed-off-by: Jan Beulich <[email protected]>
> Release-Acked-by: Oleksii Kurochko <[email protected]>
> ---

Reviewed-by: Teddy Astie <[email protected]>

> This really was part of one of the XSTATE cleanup patches at the head of
> the AMX series. This explains the specific placement ahead of the call to
> xstate_init()). Likely anything from there downwards shouldn't really
> live in identify_cpu() anyway.
> ---
> v3: Make call from setup_force_cpu_cap() conditional.
> v2: Call calculate_host_cpu_policy() from setup_{force,clear}_cpu_cap()
>      instead of from init_guest_cpu_policies().


Teddy
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