neonvm-kernel: reduce difference between configs

[mikhail-sakhnov]

Take amd64 config, drop all x86,intel or amd related options. Add minimum set of variables required to build and boot on arm.

Diff is impossible to read, because it is 5k lines of dropped arm kernel config.

However, actual changes are the following:

• Delete options having x86, amd or intel in the name
• add following options to the end of the config

CONFIG_ARM=y
CONFIG_ARM_VIRT=y
CONFIG_ARCH_VIRT=y
CONFIG_PCI_HOST_GENERIC=y
CONFIG_PCI_ECAM=y
CONFIG_SERIAL_AMBA_PL011=y
CONFIG_SERIAL_AMBA_PL011_CONSOLE=y
CONFIG_ARM_GIC=y
CONFIG_ARM_GIC_V3=y
CONFIG_HAVE_ARM_ARCH_TIMER=y
CONFIG_ARM_PSCI=y
CONFIG_HAVE_SMP=y
CONFIG_HIGHMEM=y
CONFIG_HIGHPTE=y
CONFIG_ARM_LPAE=y
CONFIG_VFP=y
CONFIG_RTC_DRV_PL031=y

Absolute minimum I see as required:

• CONFIG_ARM, CONFIG_ARM_VIRT, CONFIG_ARCH_VIRT are generic options to specify we run on ARM in QEMU.

• CONFIG_PCI_ECAM, CONFIG_PCI_HOST_GENERIC, CONFIG_SERIAL_AMBA_PL011, CONFIG_SERIAL_AMBA_PL011_CONSOLE are required to have serial port available.

-CONFIG_ARM_GIC support for interruptions.

The rest is either to be on pair with amd config or I found them useful potentially with large computers or they were mentioned in different sources as nice to have with qemu based emulation.

Based on top of the #1141 to trigger test run, both PRs are required for the e2e tests on arm.

#1196

This 877293b (#1248) commit has kernel related changes.

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[sharnoff]

If it works, it works — looking forward to further improvements down the line :)

Maybe worth running make menuconfig on the ARM config to canonicalize it first

[Omrigan]

BTW, is it possible for us to have the same config for x86 and arm? Just enable everything which is needed by either one.

[mikhail-sakhnov]

@Omrigan I think yes, there is a separate issue to handle config difference correctly #1093

This PR has slightly different scope - to reduce initially large and fat config.