• Khalid Aziz's avatar
    sparc64: Add support for ADI (Application Data Integrity) · 74a04967
    Khalid Aziz authored
    ADI is a new feature supported on SPARC M7 and newer processors to allow
    hardware to catch rogue accesses to memory. ADI is supported for data
    fetches only and not instruction fetches. An app can enable ADI on its
    data pages, set version tags on them and use versioned addresses to
    access the data pages. Upper bits of the address contain the version
    tag. On M7 processors, upper four bits (bits 63-60) contain the version
    tag. If a rogue app attempts to access ADI enabled data pages, its
    access is blocked and processor generates an exception. Please see
    Documentation/sparc/adi.txt for further details.
    
    This patch extends mprotect to enable ADI (TSTATE.mcde), enable/disable
    MCD (Memory Corruption Detection) on selected memory ranges, enable
    TTE.mcd in PTEs, return ADI parameters to userspace and save/restore ADI
    version tags on page swap out/in or migration. ADI is not enabled by
    default for any task. A task must explicitly enable ADI on a memory
    range and set version tag for ADI to be effective for the task.
    Signed-off-by: 's avatarKhalid Aziz <khalid.aziz@oracle.com>
    Cc: Khalid Aziz <khalid@gonehiking.org>
    Reviewed-by: 's avatarAnthony Yznaga <anthony.yznaga@oracle.com>
    Signed-off-by: 's avatarDavid S. Miller <davem@davemloft.net>
    74a04967
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