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Diffstat (limited to 'Documentation/admin-guide/l1tf.rst')
| -rw-r--r-- | Documentation/admin-guide/l1tf.rst | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/Documentation/admin-guide/l1tf.rst b/Documentation/admin-guide/l1tf.rst index bae52b845de0..9af977384168 100644 --- a/Documentation/admin-guide/l1tf.rst +++ b/Documentation/admin-guide/l1tf.rst @@ -405,6 +405,9 @@ time with the option "l1tf=". The valid arguments for this option are: off Disables hypervisor mitigations and doesn't emit any warnings. + It also drops the swap size and available RAM limit restrictions + on both hypervisor and bare metal. + ============ ============================================================= The default is 'flush'. For details about L1D flushing see :ref:`l1d_flush`. @@ -553,7 +556,7 @@ When nested virtualization is in use, three operating systems are involved: the bare metal hypervisor, the nested hypervisor and the nested virtual machine. VMENTER operations from the nested hypervisor into the nested guest will always be processed by the bare metal hypervisor. If KVM is the -bare metal hypervisor it wiil: +bare metal hypervisor it will: - Flush the L1D cache on every switch from the nested hypervisor to the nested virtual machine, so that the nested hypervisor's secrets are not @@ -576,7 +579,8 @@ Default mitigations The kernel default mitigations for vulnerable processors are: - PTE inversion to protect against malicious user space. This is done - unconditionally and cannot be controlled. + unconditionally and cannot be controlled. The swap storage is limited + to ~16TB. - L1D conditional flushing on VMENTER when EPT is enabled for a guest. |