Re: [PATCH 2/4] xen: Drop CONFIG_XEN_PVHVM

[Juergen Gross]

On 05.08.26 10:28, Andrew Cooper wrote:
> On 05/08/2026 9:21 am, Juergen Gross wrote:
> > On x86 CONFIG_XEN_PVHVM is now a synonym of CONFIG_XEN.
> >
> > In Xen specific x86 code it can be just dropped, in non-Xen specific
> > x86 code it can be replaced with CONFIG_XEN.
> >
> > In architecture independent code it is used only where CONFIG_XEN is
> > defined, so it can be replaced with CONFIG_X86 there.
> >
> > Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
> >
> > diff --git a/arch/x86/include/asm/idtentry.h b/arch/x86/include/asm/idtentry.h
> > index 20f548702404..f400cfac69a6 100644
> > --- a/arch/x86/include/asm/idtentry.h
> > +++ b/arch/x86/include/asm/idtentry.h
> > @@ -745,7 +745,7 @@ DECLARE_IDTENTRY_SYSVEC(HYPERV_STIMER0_VECTOR,		sysvec_hyperv_stimer0);
> >   DECLARE_IDTENTRY_SYSVEC(HYPERVISOR_CALLBACK_VECTOR,	sysvec_acrn_hv_callback);
> >   #endif
> >   
> > -#ifdef CONFIG_XEN_PVHVM
> > +#ifdef CONFIG_XEN
> >   DECLARE_IDTENTRY_SYSVEC(HYPERVISOR_CALLBACK_VECTOR,	sysvec_xen_hvm_callback);
> >   #endif
>
> I'm very happy to see a reduction in the number of Kconfig symbols for
> Xen (there are definitely too many), but this looks wonky.
>
> Or are you saying that there really is no way to build a Xen PV guest
> excluding the HVM-only bits?

Seems so, yes.

This has been like this for at least several years now.

What you can do is to configure the kernel to exclude the Xen platform PCI
device (CONFIG_XEN_PVHVM_GUEST=n).


Juergen

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