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KVM/arm64: First batch of fixes for 6.15 - Rework heuristics for resolving the fault IPA (HPFAR_EL2 v. re-walk stage-1 page tables) to align with the architecture. This avoids possibly taking an SEA at EL2 on the page table walk or using an architecturally UNKNOWN fault IPA. - Use acquire/release semantics in the KVM FF-A proxy to avoid reading a stale value for the FF-A version. - Fix KVM guest driver to match PV CPUID hypercall ABI. - Use Inner Shareable Normal Write-Back mappings at stage-1 in KVM selftests, which is the only memory type for which atomic instructions are architecturally guaranteed to work.