kvm: prefault a floating point state before restoring it

If physical pages of a memory region are not mapped yet, the kernel will
trigger KVM_EXIT_MMIO and we will map physical pages in bluepillHandler().

An instruction that triggered a fault will not be re-executed, it
will be emulated in the kernel, but it can't  emulate complex
instructions like xsave, xrstor. We can touch the memory with
simple instructions to workaround this problem.

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