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Anti-Rollback (ARB) is a QAT GEN6 hardware feature that prevents loading firmware with a Security Version Number (SVN) lower than an authorized minimum. This protects against downgrade attacks by ensuring that only firmware at or above a committed SVN can run on the acceleration device. During firmware loading, the driver checks the SVN validation status via a hardware CSR. If the check reports a failure, firmware authentication is aborted. If it reports a retry status, the driver reissues the authentication command up to a maximum number of retries. Extend the firmware admin interface with two new messages, ICP_QAT_FW_SVN_READ and ICP_QAT_FW_SVN_COMMIT, to query and commit the SVN, respectively. Integrate the SVN check into the firmware authentication path in qat_uclo.c so the driver can react to anti-rollback status during device bring-up. Expose SVN information to userspace via a new sysfs attribute group, qat_svn, under the PCI device directory. The group provides read-only attributes for the active, enforced minimum, and permanent minimum SVN values, as well as a write-only commit attribute that allows a system administrator to commit the currently active SVN as the new authorized minimum. This is based on earlier work by Ciunas Bennett. Signed-off-by: Suman Kumar Chakraborty <suman.kumar.chakraborty@intel.com> Reviewed-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>