From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Subject: Re: Xen's Linux kernel config options V2
Date: Wed, 4 Feb 2015 14:57:03 +0000
Message-ID: <alpine.DEB.2.02.1502041446040.29696@kaball.uk.xensource.com>
References: <54905BF1.2050608@suse.com> <54D1FA55.9000503@citrix.com>
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To: David Vrabel <david.vrabel@citrix.com>
Cc: Juergen Gross <jgross@suse.com>, "xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>, "Ian.Campbell@citrix.com" <Ian.Campbell@citrix.com>, Jan Beulich <JBeulich@suse.com>, Boris Ostrovsky <boris.ostrovsky@oracle.com>
List-Id: xen-devel@lists.xenproject.org

On Wed, 4 Feb 2015, David Vrabel wrote:
> On 16/12/14 16:21, Juergen Gross wrote:
> > Hi,
> > 
> > This is a design proposal for a rework of the config options on the
> > Linux kernel which are related to Xen.
> > 
> > The need to do so arose from the fact that it is currently not
> > possible to build the Xen frontend drivers for a non-pvops kernel,
> > e.g. to run them in a HVM-domain. There are more drawbacks in the
> > current config options to which I'll come later.
> > 
> > Option                          Selects                 Depends
> > ----------------------------------------------------------------------
> > XEN
> >   XEN_PV(x86)                   XEN_HAVE_PVMMU
> >                                 PARAVIRT
> >                                 PARAVIRT_CLOCK
> >   XEN_PVH(x86)                  XEN_PVHVM
> >                                 PARAVIRT  
> >                                 PARAVIRT_CLOCK
> >   XEN_PVHVM                     PARAVIRT
> >                                 PARAVIRT_CLOCK

PARAVIRT_CLOCK and PARAVIRT are x86 specific.
Given that there is no CONFIG_PV or CONFIG_PVH or even CONFIG_PVHVM on
arm and arm64 as there is just one type of guest, I would rather just
have CONFIG_XEN there.


> >   XEN_BACKEND                   SWIOTLB_XEN(arm,arm64)  XEN_PV(x86) ||
> >                                                         XEN_PVH(x86) ||
> >                                                         XEN_PVHVM
> >     XEN_BLKDEV_BACKEND
> >     XEN_PCIDEV_BACKEND(x86)
> >     XEN_SCSI_BACKEND
> >     XEN_NETDEV_BACKEND
> >   PCI_XEN(x86)                  SWIOTLB_XEN
> >   XEN_DOM0                      XEN_BACKEND             XEN_PV(x86) ||
> >                                 PCI_XEN(x86)            XEN_PVH(x86)
> >     XEN_ACPI_HOTPLUG_MEMORY                             XEN_STUB
> >     XEN_ACPI_HOTPLUG_CPU                                XEN_STUB
> >     XEN_MCE_LOG(x86)
> >   XEN_MAX_DOMAIN_MEMORY(x86)
> >   XEN_SAVE_RESTORE(x86)
> >   XEN_DEBUG_FS
> >   XEN_WDT
> >   XEN_BALLOON
> >     XEN_SELFBALLOONING                                  XEN_TMEM
> >     XEN_BALLOON_MEMORY_HOTPLUG
> >     XEN_SCRUB_PAGES
> >   XENFS                         XEN_PRIVCMD
> >     XEN_COMPAT_XENFS
> >   XEN_SYS_HYPERVISOR
> >   XEN_DEV_EVTCHN
> >   XEN_GNTDEV
> >   XEN_GRANT_DEV_ALLOC
> >   SWIOTLB_XEN
> >   XEN_TMEM

not available on arm and arm64


> >   XEN_PRIVCMD
> >   XEN_STUB(x86_64)                                      BROKEN
> >   XEN_ACPI_PROCESSOR(x86)
> >   XEN_HAVE_PVMMU

x86 specific


> >   XEN_EFI(x64)

FYI soon to be available on arm


> >   XEN_XENBUS_FRONTEND
> > XEN_FRONTEND                    XEN
> >                                 XEN_XENBUS_FRONTEND
> >   XEN_FBDEV_FRONTEND            INPUT_XEN_KBDDEV_FRONTEND
> >   XEN_BLKDEV_FRONTEND
> >   HVC_XEN_FRONTEND              HVC_XEN
> >   TCG_XEN
> >   XEN_PCIDEV_FRONTEND           PCI_XEN

x86 specific for the moment


> >   XEN_SCSI_FRONTEND
> >   INPUT_XEN_KBDDEV_FRONTEND
> >   XEN_NETDEV_FRONTEND
> >   XEN_PLATFORM_PCI

definitely x86 only


> This looks fine to me.
> 
> David
> 
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