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| author |   Linus Torvalds <torvalds@linux-foundation.org> | 2018-12-25 16:26:42 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-12-25 16:26:42 -0800 |
| commit | 13e1ad2be3a85f5c0f76e82af9806b3d12a574d0 (patch) | |
| tree | db693bd41dbea4d361477175c7431cd4fb5c2bab /Documentation/admin-guide | |
| parent | Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip (diff) | |
| parent | x86/speculation: Add support for STIBP always-on preferred mode (diff) | |
| download | linux-dev-13e1ad2be3a85f5c0f76e82af9806b3d12a574d0.tar.xz linux-dev-13e1ad2be3a85f5c0f76e82af9806b3d12a574d0.zip | |
Merge branch 'x86-pti-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 pti updates from Thomas Gleixner:
"No point in speculating what's in this parcel:
- Drop the swap storage limit when L1TF is disabled so the full space
is available
- Add support for the new AMD STIBP always on mitigation mode
- Fix a bunch of STIPB typos"
* 'x86-pti-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/speculation: Add support for STIBP always-on preferred mode
x86/speculation/l1tf: Drop the swap storage limit restriction when l1tf=off
x86/speculation: Change misspelled STIPB to STIBP
Diffstat (limited to 'Documentation/admin-guide')
| -rw-r--r-- | Documentation/admin-guide/kernel-parameters.txt | 3 | ||||
| -rw-r--r-- | Documentation/admin-guide/l1tf.rst | 6 |
2 files changed, 8 insertions, 1 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 362a18cd68e1..7fd61bf339b4 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -2099,6 +2099,9 @@ off Disables hypervisor mitigations and doesn't emit any warnings. + It also drops the swap size and available + RAM limit restriction on both hypervisor and + bare metal. Default is 'flush'. diff --git a/Documentation/admin-guide/l1tf.rst b/Documentation/admin-guide/l1tf.rst index b85dd80510b0..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`. @@ -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. |