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19e612cd59
Add helpers to check if a given page in a guest_memfd instance is PRIVATE versus SHARED, and use the "is shared" helper instead of an open-coded equivalent in the user pagefault handler. In addition to the immediate usage, providing an "is private" helper will allow cleaning up the so called prepare() code, and eventually will be heavily used once in-place conversion support comes along. No functional change intended. Reviewed-by: Xiaoyao Li <xiaoyao.li@intel.com> Reviewed-by: Ackerley Tng <ackerleytng@google.com> Reviewed-by: Fuad Tabba <fuad.tabba@linux.dev> Link: https://patch.msgid.link/20260723210811.72720-6-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com>