Tyler Hicks pointed out that Cortex-A57, Cortex-A72, Cortex-A73, and Cortex-A75 
all just receive
firmware updates that disabled memory disambiguation at boot time to mitigate 
SSB. The following page indicates that the patches are only relevant for 
Cortex-A76. 
https://developer.arm.com/support/arm-security-updates/speculative-processor-vulnerability

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https://bugs.launchpad.net/bugs/1787993

Title:
  [Bionic] Spectre v4 mitigation (Speculative Store Bypass Disable)
  support for arm64 using SMC firmware call to set a hardware chicken
  bit

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