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16dbe77a5b
Use the CAST instruction to swap the guest descriptor when FEAT_LSUI is enabled, avoiding the need to clear the PAN bit. FEAT_LSUI is introduced in Armv9.6, where FEAT_PAN is mandatory. However, this assumption may not always hold: - Some CPUs may advertise FEAT_LSUI but lack FEAT_PAN. - Virtualization or ID register overrides may expose invalid feature combinations. Therefore, instead of disabling FEAT_LSUI when FEAT_PAN is absent, wrap LSUI instructions with uaccess_ttbr0_enable()/disable() when ARM64_SW_TTBR0_PAN is enabled. Signed-off-by: Yeoreum Yun <yeoreum.yun@arm.com> Reviewed-by: Marc Zyngier <maz@kernel.org> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>