Kernel with L1TF mitigation patches panics while running on CPU without EPT

Solution Verified - Updated -

Issue

The kernel with L1TF mitigation patches applied panics if it is being run on the CPU that does not support Extended Page Tables (EPT).

RHEL 7 kernel may panic if userspace tries to read the /sys/module/kvm_intel/parameters/vmentry_l1d_flush file.

RHEL 6 kernel may panic right after the first KVM VM is started.

Environment

  • Red Hat Enterprise Linux 6 (2.6.32-754.3.5.el6.x86_64)
  • Red Hat Enterprise Linux 7 (3.10.0-862.11.6.el7.x86_64)

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