KVM: selftests: Consolidate common code for populating ucall struct
Make ucall() a common helper that populates struct ucall, and only calls into arch code to make the actually call out to userspace. Rename all arch-specific helpers to make it clear they're arch-specific, and to avoid collisions with common helpers (one more on its way...) Add WRITE_ONCE() to stores in ucall() code (as already done to aarch64 code in commit 9e2f6498 ("selftests: KVM: Handle compiler optimizations in ucall")) to prevent clang optimizations breaking ucalls. Cc: Colton Lewis <coltonlewis@google.com> Reviewed-by: Andrew Jones <andrew.jones@linux.dev> Tested-by: Peter Gonda <pgonda@google.com> Signed-off-by: Sean Christopherson <seanjc@google.com> Link: https://lore.kernel.org/r/20221006003409.649993-2-seanjc@google.com
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