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Re: [PATCH 1/4] x86/xen: Remove redundant config dependency on X86_LOCAL_APIC
- To: Jan Beulich <jbeulich@xxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Wed, 5 Aug 2026 09:43:15 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, x86@xxxxxxxxxx
- Delivery-date: Wed, 05 Aug 2026 08:43:26 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 05/08/2026 9:40 am, Jan Beulich wrote:
> On 05.08.2026 10:37, Jan Beulich wrote:
>> On 05.08.2026 10:21, Juergen Gross wrote:
>>> CONFIG_XEN depends on CONFIG_X86_LOCAL_APIC already, so the dependency
>>> of CONFIG_XEN_PVHVM on CONFIG_X86_LOCAL_APIC can be dropped.
>>>
>>> Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
>> Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
> Hmm, looking at patch 2 I wonder: Isn't it XEN's dependency which wants
> dropping? XEN_PV shouldn't require X86_LOCAL_APIC, should it?
In Linux terms, XEN_PV does need X86_LOCAL_APIC.
While the PV guest doesn't have an APIC directly, other areas (parsing
the ACPI tables, configuring device interrupts) require Linux to think
it's on a normal APIC-like system.
~Andrew
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