configs: Add KVM support to arm64 bcm2711_defconfig #3456
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This is an attempt to enable KVM support in the 64-bit Pi 4 kernel. I've done nothing beyond setting some obvious config options and verifying that the kernel doesn't grow too much (it doesn't), and that I/O performance doesn't suffer significantly (also negative). I would appreciate some testing by people who actually want to use KVM.
The patch is limited to 64-bit Pi 4 because BCM2711 has enough performance that a small slowdown shouldn't be a problem to most people, and KVM benefits from a 64-bit kernel.