[meta-virtualization] [RFC 1/3] xen: Create structure necessary to break Xen kernel config into dom0 / guest.

[Bruce Ashfield]

On Tue, Feb 11, 2014 at 9:45 PM, Philip Tricca <flihp at twobit.us> wrote:
> For now the config remains the same for both dom0 and guest
> DISTRO_FEATURES. This work provides the structure for migrating
> config options into the two different distro features as the need
> arises.

I have a similar split for KVM hosts and guests, the options are largely
the same, but the flexibility is maintained for cases where they really
do need to differ.

But here's a more general question, rather than having to trigger on
distro features, why not separate the differences based on different machines ?
(maybe that is what you are already doing, and I'm missing it).

i.e. for a KVM host, I use the "native" BSP + some kernel options. For the
KVM guest, I have a x86-kvm-guest BSP that encapsulates the options
and userspace that we want.

The kernel configurations and other changes you have here would be the
same, but just with a different separation mechanism.

Cheers,

Bruce

>
> Signed-off-by: Philip Tricca <flihp at twobit.us>
>
>  create mode 100644 recipes-kernel/linux/linux-yocto/xen-common.cfg
>  create mode 100644 recipes-kernel/linux/linux-yocto/xen-dom0.cfg
>  create mode 100644 recipes-kernel/linux/linux-yocto/xen-dom0.scc
>  create mode 100644 recipes-kernel/linux/linux-yocto/xen-guest.cfg
>  create mode 100644 recipes-kernel/linux/linux-yocto/xen-guest.scc
>  delete mode 100644 recipes-kernel/linux/linux-yocto/xen.cfg
>  delete mode 100644 recipes-kernel/linux/linux-yocto/xen.scc
>
> diff --git a/recipes-kernel/linux/linux-yocto/xen-common.cfg b/recipes-kernel/linux/linux-yocto/xen-common.cfg
> new file mode 100644
> index 0000000..4e796b9
> --- /dev/null
> +++ b/recipes-kernel/linux/linux-yocto/xen-common.cfg
> @@ -0,0 +1,54 @@
> +###
> +# linux 3.4, 3.8
> +CONFIG_PARAVIRT_GUEST=y
> +###
> +
> +###
> +# linux 3.10
> +CONFIG_HYPERVISOR_GUEST=y
> +###
> +
> +CONFIG_PARAVIRT=y
> +CONFIG_XEN=y
> +CONFIG_XEN_DOM0=y
> +CONFIG_XEN_PRIVILEGED_GUEST=y
> +CONFIG_XEN_PVHVM=y
> +CONFIG_XEN_MAX_DOMAIN_MEMORY=500
> +CONFIG_XEN_SAVE_RESTORE=y
> +CONFIG_PARAVIRT_CLOCK=y
> +CONFIG_HIBERNATE_CALLBACKS=y
> +CONFIG_PCI_XEN=y
> +CONFIG_XEN_PCIDEV_FRONTEND=y
> +CONFIG_SYS_HYPERVISOR=y
> +CONFIG_XEN_BLKDEV_FRONTEND=y
> +CONFIG_XEN_BLKDEV_BACKEND=m
> +CONFIG_XEN_NETDEV_FRONTEND=y
> +CONFIG_XEN_NETDEV_BACKEND=m
> +CONFIG_INPUT_MISC=y
> +CONFIG_INPUT_XEN_KBDDEV_FRONTEND=y
> +CONFIG_HVC_IRQ=y
> +CONFIG_HVC_XEN=y
> +CONFIG_HVC_XEN_FRONTEND=y
> +CONFIG_XEN_WDT=m
> +CONFIG_FB_SYS_FILLRECT=y
> +CONFIG_FB_SYS_COPYAREA=y
> +CONFIG_FB_SYS_IMAGEBLIT=y
> +CONFIG_FB_SYS_FOPS=y
> +CONFIG_FB_DEFERRED_IO=y
> +CONFIG_XEN_FBDEV_FRONTEND=y
> +CONFIG_XEN_BALLOON=y
> +CONFIG_XEN_SCRUB_PAGES=y
> +CONFIG_XEN_DEV_EVTCHN=y
> +CONFIG_XEN_BACKEND=y
> +CONFIG_XENFS=y
> +CONFIG_XEN_COMPAT_XENFS=y
> +CONFIG_XEN_SYS_HYPERVISOR=y
> +CONFIG_XEN_XENBUS_FRONTEND=y
> +CONFIG_XEN_GNTDEV=m
> +CONFIG_XEN_GRANT_DEV_ALLOC=m
> +CONFIG_SWIOTLB_XEN=y
> +CONFIG_XEN_PCIDEV_BACKEND=m
> +CONFIG_XEN_PRIVCMD=y
> +CONFIG_XEN_ACPI_PROCESSOR=m
> +CONFIG_XEN_MCE_LOG=y
> +CONFIG_XEN_HAVE_PVMMU=y
> diff --git a/recipes-kernel/linux/linux-yocto/xen-dom0.cfg b/recipes-kernel/linux/linux-yocto/xen-dom0.cfg
> new file mode 100644
> index 0000000..e69de29
> diff --git a/recipes-kernel/linux/linux-yocto/xen-dom0.scc b/recipes-kernel/linux/linux-yocto/xen-dom0.scc
> new file mode 100644
> index 0000000..a84b0cb
> --- /dev/null
> +++ b/recipes-kernel/linux/linux-yocto/xen-dom0.scc
> @@ -0,0 +1,5 @@
> +define KFEATURE_DESCRIPTION "Xen dom0 Kernel Support"
> +define KFEATURE_COMPATIBILITY arch
> +
> +kconf non-hardware xen-common.cfg
> +kconf non-hardware xen-dom0.cfg
> diff --git a/recipes-kernel/linux/linux-yocto/xen-guest.cfg b/recipes-kernel/linux/linux-yocto/xen-guest.cfg
> new file mode 100644
> index 0000000..e69de29
> diff --git a/recipes-kernel/linux/linux-yocto/xen-guest.scc b/recipes-kernel/linux/linux-yocto/xen-guest.scc
> new file mode 100644
> index 0000000..0edba0c
> --- /dev/null
> +++ b/recipes-kernel/linux/linux-yocto/xen-guest.scc
> @@ -0,0 +1,5 @@
> +define KFEATURE_DESCRIPTION "Xen Guest Kernel Support"
> +define KFEATURE_COMPATIBILITY arch
> +
> +kconf non-hardware xen-common.cfg
> +kconf non-hardware xen-guest.cfg
> diff --git a/recipes-kernel/linux/linux-yocto/xen.cfg b/recipes-kernel/linux/linux-yocto/xen.cfg
> deleted file mode 100644
> index 4e796b9..0000000
> --- a/recipes-kernel/linux/linux-yocto/xen.cfg
> +++ /dev/null
> @@ -1,54 +0,0 @@
> -###
> -# linux 3.4, 3.8
> -CONFIG_PARAVIRT_GUEST=y
> -###
> -
> -###
> -# linux 3.10
> -CONFIG_HYPERVISOR_GUEST=y
> -###
> -
> -CONFIG_PARAVIRT=y
> -CONFIG_XEN=y
> -CONFIG_XEN_DOM0=y
> -CONFIG_XEN_PRIVILEGED_GUEST=y
> -CONFIG_XEN_PVHVM=y
> -CONFIG_XEN_MAX_DOMAIN_MEMORY=500
> -CONFIG_XEN_SAVE_RESTORE=y
> -CONFIG_PARAVIRT_CLOCK=y
> -CONFIG_HIBERNATE_CALLBACKS=y
> -CONFIG_PCI_XEN=y
> -CONFIG_XEN_PCIDEV_FRONTEND=y
> -CONFIG_SYS_HYPERVISOR=y
> -CONFIG_XEN_BLKDEV_FRONTEND=y
> -CONFIG_XEN_BLKDEV_BACKEND=m
> -CONFIG_XEN_NETDEV_FRONTEND=y
> -CONFIG_XEN_NETDEV_BACKEND=m
> -CONFIG_INPUT_MISC=y
> -CONFIG_INPUT_XEN_KBDDEV_FRONTEND=y
> -CONFIG_HVC_IRQ=y
> -CONFIG_HVC_XEN=y
> -CONFIG_HVC_XEN_FRONTEND=y
> -CONFIG_XEN_WDT=m
> -CONFIG_FB_SYS_FILLRECT=y
> -CONFIG_FB_SYS_COPYAREA=y
> -CONFIG_FB_SYS_IMAGEBLIT=y
> -CONFIG_FB_SYS_FOPS=y
> -CONFIG_FB_DEFERRED_IO=y
> -CONFIG_XEN_FBDEV_FRONTEND=y
> -CONFIG_XEN_BALLOON=y
> -CONFIG_XEN_SCRUB_PAGES=y
> -CONFIG_XEN_DEV_EVTCHN=y
> -CONFIG_XEN_BACKEND=y
> -CONFIG_XENFS=y
> -CONFIG_XEN_COMPAT_XENFS=y
> -CONFIG_XEN_SYS_HYPERVISOR=y
> -CONFIG_XEN_XENBUS_FRONTEND=y
> -CONFIG_XEN_GNTDEV=m
> -CONFIG_XEN_GRANT_DEV_ALLOC=m
> -CONFIG_SWIOTLB_XEN=y
> -CONFIG_XEN_PCIDEV_BACKEND=m
> -CONFIG_XEN_PRIVCMD=y
> -CONFIG_XEN_ACPI_PROCESSOR=m
> -CONFIG_XEN_MCE_LOG=y
> -CONFIG_XEN_HAVE_PVMMU=y
> diff --git a/recipes-kernel/linux/linux-yocto/xen.scc b/recipes-kernel/linux/linux-yocto/xen.scc
> deleted file mode 100644
> index b588e5d..0000000
> --- a/recipes-kernel/linux/linux-yocto/xen.scc
> +++ /dev/null
> @@ -1,4 +0,0 @@
> -define KFEATURE_DESCRIPTION "Xen Kernel Support"
> -define KFEATURE_COMPATIBILITY arch
> -
> -kconf non-hardware xen.cfg
> diff --git a/recipes-kernel/linux/linux-yocto_3.10.bbappend b/recipes-kernel/linux/linux-yocto_3.10.bbappend
> index c029c05..e4ae462 100644
> --- a/recipes-kernel/linux/linux-yocto_3.10.bbappend
> +++ b/recipes-kernel/linux/linux-yocto_3.10.bbappend
> @@ -16,4 +16,8 @@ module_autoload_kvm-intel = "kvm-intel"
>  KERNEL_FEATURES_append += "${@base_contains('DISTRO_FEATURES', 'aufs', ' features/aufs/aufs-enable.scc', '', d)}"
>
>  # xen kernel support
> -SRC_URI += "${@base_contains('DISTRO_FEATURES', 'xen', ' file://xen.scc', '', d)}"
> +SRC_URI += " \
> +    ${@base_contains('DISTRO_FEATURES', 'xen-dom0', ' file://xen-dom0.scc', '', d)} \
> +    ${@base_contains('DISTRO_FEATURES', 'xen-guest', ' file://xen-guest.scc', '', d)} \
> +"
> +
> --
> 1.7.10.4
>
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