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Add a definition of HAFGRTR_EL2 (fine grained trap control for the AMU) as per DDI0601 2023-09. This was extracted from Fuad Tabba's patch "KVM: arm64: Handle HAFGRTR_EL2 trapping in nested virt". Signed-off-by: Fuad Tabba <tabba@google.com> Link: https://lore.kernel.org/r/20231206100503.564090-6-tabba@google.com [Extract sysreg update and rewrite commit message -- broonie] Signed-off-by: Mark Brown <broonie@kernel.org> Link: https://lore.kernel.org/r/20231209-b4-arm64-sysreg-additions-v1-2-45284e538474@kernel.org Signed-off-by: Will Deacon <will@kernel.org>