linux-kernel - Re: [PATCH 09/15] x86/kconfig/64: Enable more virtualization guest options in the defconfig: enable Xen, Xen_PVH, Jailhouse, ACRN, Intel TDX and Hyper-V

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Message-ID: <aCXp4FiECnz5f4Nr@gmail.com>
Date: Thu, 15 May 2025 15:19:28 +0200
From: Ingo Molnar <mingo@...nel.org>
To: Jürgen Groß <jgross@...e.com>
Cc: linux-kernel@...r.kernel.org, "H . Peter Anvin" <hpa@...or.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Borislav Petkov <bp@...en8.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Vitaly Kuznetsov <vkuznets@...hat.com>,
	"Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
	Ard Biesheuvel <ardb@...nel.org>, Arnd Bergmann <arnd@...db.de>,
	Carlos Bilbao <carlos.bilbao@...nel.org>,
	David Woodhouse <dwmw@...zon.co.uk>,
	Elena Reshetova <elena.reshetova@...el.com>,
	Fei Li <fei1.li@...el.com>, Jan Kiszka <jan.kiszka@...mens.com>,
	Masahiro Yamada <yamada.masahiro@...ionext.com>,
	Michal Marek <michal.lkml@...kovi.net>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Sean Christopherson <seanjc@...gle.com>,
	Stefano Stabellini <sstabellini@...nel.org>
Subject: Re: [PATCH 09/15] x86/kconfig/64: Enable more virtualization guest
 options in the defconfig: enable Xen, Xen_PVH, Jailhouse, ACRN, Intel TDX
 and Hyper-V


* Jürgen Groß <jgross@...e.com> wrote:

> On 06.05.25 19:09, Ingo Molnar wrote:
> > Since the x86 defconfig aims to be a distro kernel work-alike with
> > fewer drivers and a shorter build time, refresh all the virtualization
> > guest Kconfig features, enabling paravirt spinlocks, and
> > enabling the guest support code for the following guests:
> > 
> >   - Xen
> >   - Xen_PVH
> 
> With those it might be a good idea to add:
> 
> CONFIG_XEN_BLKDEV_FRONTEND=m
> CONFIG_XEN_NETDEV_FRONTEND=m
> CONFIG_HVC_XEN=y
> CONFIG_XEN_BALLOON=y

Yeah, and these already get enabled automatically, due to their 
defaults:

 starship:~/mingo.tip.git> grep -E 'CONFIG_XEN_BLKDEV_FRONTEND|CONFIG_XEN_NETDEV_FRONTEND|CONFIG_HVC_XEN|CONFIG_XEN_BALLOON' .config
 CONFIG_XEN_BLKDEV_FRONTEND=y
 CONFIG_XEN_NETDEV_FRONTEND=y
 CONFIG_HVC_XEN=y
 CONFIG_HVC_XEN_FRONTEND=y
 CONFIG_XEN_BALLOON=y

defconfig files do not include entries that get enabled anyway - this 
compresses defconfig files substantially.

Thanks,

	Ingo