KVM: selftests: Require GPA to be aligned when backed by hugepages

Assert that the GPA for a memslot backed by a hugepage is aligned to
the hugepage size and fix perf_test_util accordingly.  Lack of GPA
alignment prevents KVM from backing the guest with hugepages, e.g. x86's
write-protection of hugepages when dirty logging is activated is
otherwise not exercised.

Add a comment explaining that guest_page_size is for non-huge pages to
try and avoid confusion about what it actually tracks.

Cc: Ben Gardon <[email protected]>
Cc: Yanan Wang <[email protected]>
Cc: Andrew Jones <[email protected]>
Cc: Peter Xu <[email protected]>
Cc: Aaron Lewis <[email protected]>
Signed-off-by: Sean Christopherson <[email protected]>
[Used get_backing_src_pagesz() to determine alignment dynamically.]
Signed-off-by: David Matlack <[email protected]>
Message-Id: <[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>

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