Re: [PATCH 4/4] x86/xen: Drop CONFIG_XEN_PVHVM_SMP

Juergen Gross <[email protected]> Wed, 5 Aug 2026 10:55:54 +0200

Newsgroups	gmane.comp.emulators.xen.devel,gmane.linux.kernel
Message-ID	<[email protected]>

On 05.08.26 10:44, Jan Beulich wrote:
> On 05.08.2026 10:21, Juergen Gross wrote:
>> --- a/arch/x86/xen/Makefile
>> +++ b/arch/x86/xen/Makefile
>> @@ -37,8 +37,8 @@ obj-$(CONFIG_XEN_PVH)		+= enlighten_pvh.o
>>   obj-$(CONFIG_EVENT_TRACING)	+= trace.o
>>   
>>   obj-$(CONFIG_SMP)		+= smp.o
>> +obj-$(CONFIG_SMP)		+= smp_hvm.o
>>   obj-$(CONFIG_XEN_PV_SMP)  	+= smp_pv.o
>> -obj-$(CONFIG_XEN_PVHVM_SMP)  	+= smp_hvm.o
> 
> Similar issue here - in a PV-only config smp_hvm.o doesn't want / shouldn't
> need building.

Note that I didn't change any functionality.

I agree that it seems a little bit strange, but in the end I believe
the current status is okay-ish. PV-only hasn't been something in upstream
Linux since Xen support was added, as PV was always meant to be an
alternative to bare metal support via paravirt patching. It might have
been possible to build a kernel not really functional on bare metal, but
this was more like the ability to build a x86 kernel not working on any
existing machine.

IMO the Xen kernel config options should allow for adding Xen-specific
features, but minimum Xen support should always have basic HVM support,
which includes the Xen specific performance enhancements.

Juergen

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