linux-kernel - RE: [PATCH -v2 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:
 <SN6PR02MB415751056C485BAFFE617EB8D48BA@SN6PR02MB4157.namprd02.prod.outlook.com>
Date: Thu, 8 May 2025 01:43:15 +0000
From: Michael Kelley <mhklinux@...look.com>
To: Ingo Molnar <mingo@...nel.org>, Vitaly Kuznetsov <vkuznets@...hat.com>
CC: "linux-kernel@...r.kernel.org" <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>, 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 -v2 09/15] x86/kconfig/64: Enable more virtualization
 guest options in the defconfig: enable Xen, Xen_PVH, Jailhouse, ACRN, Intel
 TDX and Hyper-V

From: Ingo Molnar <mingo@...nel.org> Sent: Tuesday, May 6, 2025 10:03 AM
> 
> * Vitaly Kuznetsov <vkuznets@...hat.com> wrote:
> 
> > 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

It looks like CONFIG_HYPERV_STORAGE is missing from your updated
patch below.

> > CONFIG_HYPERV_NET=m
> > CONFIG_HYPERV_KEYBOARD=m

Also CONFIG_HYPERV_KEYBOARD is missing.

Michael

> > CONFIG_DRM_HYPERV=m
> > CONFIG_HID_HYPERV_MOUSE=m
> > CONFIG_HYPERV=m
> > CONFIG_HYPERV_UTILS=m
> > CONFIG_HYPERV_BALLOON=m
> 
> We can certainly do that. The only reason I missed it is because
> CONFIG_HYPERV et al have hidden away in the 'drivers' section of the
> .config, which I didn't examine. The other guest support options are in
> the generic config section.
> 
> Updated patch attached.
> 
> Thanks,
> 
> 	Ingo
> 
> =================================>
> From: Ingo Molnar <mingo@...nel.org>
> Date: Mon, 5 May 2025 10:49:11 +0200
> Subject: [PATCH] x86/kconfig/64: Enable more virtualization guest options in the
> defconfig: enable Xen, Xen_PVH, Jailhouse, ACRN, Intel TDX and Hyper-V
> 
> 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
>  - Hyper-V
> 
> Signed-off-by: Ingo Molnar <mingo@...nel.org>
> Acked-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> 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: 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 | 14 +++++++++++++-
>  1 file changed, 13 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/x86/configs/defconfig.x86_64 b/arch/x86/configs/defconfig.x86_64
> index 156e9490e29b..df786b8b4e85 100644
> --- a/arch/x86/configs/defconfig.x86_64
> +++ b/arch/x86/configs/defconfig.x86_64
> @@ -30,7 +30,12 @@ CONFIG_PROFILING=y
>  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
> @@ -128,6 +133,7 @@ CONFIG_NET_9P=y
>  CONFIG_NET_9P_VIRTIO=y
>  CONFIG_PCI=y
>  CONFIG_PCIEPORTBUS=y
> +CONFIG_PCI_HYPERV=y
>  CONFIG_HOTPLUG_PCI=y
>  CONFIG_PCCARD=y
>  CONFIG_YENTA=y
> @@ -168,6 +174,7 @@ CONFIG_SKY2=y
>  CONFIG_FORCEDETH=y
>  CONFIG_8139TOO=y
>  CONFIG_R8169=y
> +CONFIG_HYPERV_NET=y
>  CONFIG_INPUT_EVDEV=y
>  CONFIG_INPUT_JOYSTICK=y
>  CONFIG_INPUT_TABLET=y
> @@ -198,6 +205,7 @@ CONFIG_AGP_INTEL=y
>  CONFIG_DRM=y
>  CONFIG_DRM_I915=y
>  CONFIG_DRM_VIRTIO_GPU=y
> +CONFIG_DRM_HYPERV=y
>  CONFIG_SOUND=y
>  CONFIG_SND=y
>  CONFIG_SND_HRTIMER=y
> @@ -214,6 +222,7 @@ CONFIG_HID_PETALYNX=y
>  CONFIG_HID_SAMSUNG=y
>  CONFIG_HID_SONY=y
>  CONFIG_HID_SUNPLUS=y
> +CONFIG_HID_HYPERV_MOUSE=y
>  CONFIG_HID_TOPSEED=y
>  CONFIG_HID_PID=y
>  CONFIG_USB_HIDDEV=y
> @@ -231,6 +240,9 @@ CONFIG_RTC_CLASS=y
>  CONFIG_DMADEVICES=y
>  CONFIG_VIRTIO_PCI=y
>  CONFIG_VIRTIO_INPUT=y
> +CONFIG_HYPERV=y
> +CONFIG_HYPERV_UTILS=y
> +CONFIG_HYPERV_BALLOON=y
>  CONFIG_EEEPC_LAPTOP=y
>  CONFIG_AMD_IOMMU=y
>  CONFIG_INTEL_IOMMU=y