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Bhupesh Sharma
bbdbc11804
TCR_EL1.TxSZ, which controls the VA space size, is configured by a single kernel image to support either 48-bit or 52-bit VA space. If the ARMv8.2-LVA optional feature is present and we are running with a 64KB page size, then it is possible to use 52-bits of address space for both userspace and kernel addresses. However, any kernel binary that supports 52-bit must also be able to fall back to 48-bit at early boot time if the hardware feature is not present. Since TCR_EL1.T1SZ indicates the size of the memory region addressed by TTBR1_EL1, export the same in vmcoreinfo. User-space utilities like makedumpfile and crash-utility need to read this value from vmcoreinfo for determining if a virtual address lies in the linear map range. While at it also add documentation for TCR_EL1.T1SZ variable being added to vmcoreinfo. It indicates the size offset of the memory region addressed by TTBR1_EL1. Signed-off-by: Bhupesh Sharma <[email protected]> Tested-by: John Donnelly <[email protected]> Tested-by: Kamlakant Patel <[email protected]> Tested-by: Amit Daniel Kachhap <[email protected]> Reviewed-by: James Morse <[email protected]> Reviewed-by: Amit Daniel Kachhap <[email protected]> Cc: James Morse <[email protected]> Cc: Mark Rutland <[email protected]> Cc: Will Deacon <[email protected]> Cc: Steve Capper <[email protected]> Cc: Ard Biesheuvel <[email protected]> Cc: Dave Anderson <[email protected]> Cc: Kazuhito Hagio <[email protected]> Cc: [email protected] Cc: [email protected] Cc: [email protected] Link: https://lore.kernel.org/r/[email protected] [[email protected]: removed vabits_actual from the commit log] Signed-off-by: Catalin Marinas <[email protected]>