linux-kernel - Re: [PATCH 09/15] x86/kconfig/64: Enable more virtualization guest options in the defconfig: enable Xen, Xen

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Message-ID: <87msbp278e.fsf@redhat.com>
Date: Tue, 06 May 2025 15:34:25 +0200
From: Vitaly Kuznetsov <vkuznets@...hat.com>
To: Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org
Cc: "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>, Ingo
 Molnar <mingo@...nel.org>, 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>, Juergen Gross
 <jgross@...e.com>, "Kirill A . Shutemov"
 <kirill.shutemov@...ux.intel.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 and Intel
 TDX

Ingo Molnar <mingo@...nel.org> writes:

> 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
>  - Jailhouse
>  - ACRN
>  - Intel TDX

Out of curiosity and to get the idea what's good for defconfig and
what's not: do we want to enable Hyper-V and its drivers as well? I
think all popular distros enable it nowdays because of Azure. E.g.

CONFIG_PCI_HYPERV=m
CONFIG_HYPERV_STORAGE=m
CONFIG_HYPERV_NET=m
CONFIG_HYPERV_KEYBOARD=m
CONFIG_DRM_HYPERV=m
CONFIG_HID_HYPERV_MOUSE=m
CONFIG_HYPERV=m
CONFIG_HYPERV_UTILS=m
CONFIG_HYPERV_BALLOON=m

>
> Signed-off-by: Ingo Molnar <mingo@...nel.org>
> Cc: Ard Biesheuvel <ardb@...nel.org>
> Cc: Arnd Bergmann <arnd@...db.de>
> Cc: Carlos Bilbao <carlos.bilbao@...nel.org>
> Cc: David Woodhouse <dwmw@...zon.co.uk>
> Cc: Elena Reshetova <elena.reshetova@...el.com>
> Cc: Fei Li <fei1.li@...el.com>
> Cc: H. Peter Anvin <hpa@...or.com>
> Cc: Jan Kiszka <jan.kiszka@...mens.com>
> Cc: Juergen Gross <jgross@...e.com>
> Cc: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> Cc: Linus Torvalds <torvalds@...ux-foundation.org>
> Cc: Masahiro Yamada <yamada.masahiro@...ionext.com>
> Cc: Michal Marek <michal.lkml@...kovi.net>
> Cc: Paolo Bonzini <pbonzini@...hat.com>
> Cc: Sean Christopherson <seanjc@...gle.com>
> Cc: Stefano Stabellini <sstabellini@...nel.org>
> Cc: Vitaly Kuznetsov <vkuznets@...hat.com>
> ---
>  arch/x86/configs/defconfig.x86_64 | 6 ++++++
>  1 file changed, 6 insertions(+)
>
> diff --git a/arch/x86/configs/defconfig.x86_64 b/arch/x86/configs/defconfig.x86_64
> index 156e9490e29b..514f8fdc2102 100644
> --- a/arch/x86/configs/defconfig.x86_64
> +++ b/arch/x86/configs/defconfig.x86_64
> @@ -31,6 +31,12 @@ CONFIG_KEXEC=y
>  CONFIG_SMP=y
>  CONFIG_HYPERVISOR_GUEST=y
>  CONFIG_PARAVIRT=y
> +CONFIG_PARAVIRT_SPINLOCKS=y
> +CONFIG_XEN=y
> +CONFIG_XEN_PVH=y
> +CONFIG_JAILHOUSE_GUEST=y
> +CONFIG_ACRN_GUEST=y
> +CONFIG_INTEL_TDX_GUEST=y
>  CONFIG_X86_REROUTE_FOR_BROKEN_BOOT_IRQS=y
>  CONFIG_X86_MSR=y
>  CONFIG_X86_CPUID=y

-- 
Vitaly