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Re: [PATCH 2/4] xen: Drop CONFIG_XEN_PVHVM
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, x86@xxxxxxxxxx
- From: Juergen Gross <jgross@xxxxxxxx>
- Date: Wed, 5 Aug 2026 10:36:32 +0200
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- Cc: Thomas Gleixner <tglx@xxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Wed, 05 Aug 2026 08:36:42 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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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