KVM: x86/mmu: Use gfn_to_page_many_atomic() when prefetching indirect PTEs

KVM: x86/mmu: Use gfn_to_page_many_atomic() when prefetching indirect PTEs

Use gfn_to_page_many_atomic() instead of gfn_to_pfn_memslot_atomic() when
prefetching indirect PTEs (direct_pte_prefetch_many() already uses the
"to page" APIS).  Functionally, the two are subtly equivalent, as the "to
pfn" API short-circuits hva_to_pfn() if hva_to_pfn_fast() fails, i.e. is
just a wrapper for get_user_page_fast_only()/get_user_pages_fast_only().

Switching to the "to page" API will allow dropping the @atomic parameter
from the entire hva_to_pfn() callchain.

Tested-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Tested-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-ID: <20241010182427.1434605-11-seanjc@google.com>