linux-kernel - RE: [PATCH 07/13] 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:
 <SN6PR02MB4157B1676A6284ECD21E494FD490A@SN6PR02MB4157.namprd02.prod.outlook.com>
Date: Thu, 15 May 2025 23:40:06 +0000
From: Michael Kelley <mhklinux@...look.com>
To: Ingo Molnar <mingo@...nel.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, Vitaly Kuznetsov <vkuznets@...hat.com>
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>,
	Jürgen Groß <jgross@...e.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 07/13] 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: Thursday, May 15, 2025 6:27 AM
> 
> 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

I built and tested a Hyper-V guest with defconfig. The Hyper-V storage
and keyboard drivers are pulled in automatically, so my previous
comment about them being "missing" is moot.

But the Linux console for each Hyper-V guest is a synthetic graphics
console, and that didn't work with the DRM_HYPERV driver. Missing
the console pretty much kills any usefulness. DRM doesn't have 
Linux console support, so it needs CONFIG_DRM_FBDEV_EMULATION
to be set, and defconfig doesn't have it.

So either CONFIG_DRM_FBDEV_EMULATION needs to be added, or
defconfig should switch to the older HYPERV_FB driver. I think we'd
rather do the former. Vitaly -- any thoughts?

Michael

> 
> 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/x86_64_defconfig | 14 +++++++++++++-
>  1 file changed, 13 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/x86/configs/x86_64_defconfig b/arch/x86/configs/x86_64_defconfig
> index 156e9490e29b..df786b8b4e85 100644
> --- a/arch/x86/configs/x86_64_defconfig
> +++ b/arch/x86/configs/x86_64_defconfig
> @@ -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
> --
> 2.45.2
>