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* [PATCH stable-4.9] Documentation: Document arm64 kpti control
@ 2020-01-28  1:54 Florian Fainelli
  2020-01-28  8:05 ` Greg KH
  0 siblings, 1 reply; 2+ messages in thread
From: Florian Fainelli @ 2020-01-28  1:54 UTC (permalink / raw)
  To: linux-vger
  Cc: stable, jeremy.linton, gregkh, sashal, Jonathan Corbet,
	Florian Fainelli, open list:DOCUMENTATION, open list

From: Jeremy Linton <jeremy.linton@arm.com>

commit de19055564c8f8f9d366f8db3395836da0b2176c upstream

For a while Arm64 has been capable of force enabling
or disabling the kpti mitigations. Lets make sure the
documentation reflects that.

Signed-off-by: Jeremy Linton <jeremy.linton@arm.com>
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
[florian: patch the correct file]
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
---
 Documentation/kernel-parameters.txt | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 1bc12619bedd..b2d2f4539a3f 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1965,6 +1965,12 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
 			kmemcheck=2 (one-shot mode)
 			Default: 2 (one-shot mode)
 
+	kpti=		[ARM64] Control page table isolation of user
+			and kernel address spaces.
+			Default: enabled on cores which need mitigation.
+			0: force disabled
+			1: force enabled
+
 	kstack=N	[X86] Print N words from the kernel stack
 			in oops dumps.
 
-- 
2.17.1


^ permalink raw reply related	[flat|nested] 2+ messages in thread

* Re: [PATCH stable-4.9] Documentation: Document arm64 kpti control
  2020-01-28  1:54 [PATCH stable-4.9] Documentation: Document arm64 kpti control Florian Fainelli
@ 2020-01-28  8:05 ` Greg KH
  0 siblings, 0 replies; 2+ messages in thread
From: Greg KH @ 2020-01-28  8:05 UTC (permalink / raw)
  To: Florian Fainelli
  Cc: stable, jeremy.linton, sashal, Jonathan Corbet,
	open list:DOCUMENTATION, open list

On Mon, Jan 27, 2020 at 05:54:14PM -0800, Florian Fainelli wrote:
> From: Jeremy Linton <jeremy.linton@arm.com>
> 
> commit de19055564c8f8f9d366f8db3395836da0b2176c upstream
> 
> For a while Arm64 has been capable of force enabling
> or disabling the kpti mitigations. Lets make sure the
> documentation reflects that.
> 
> Signed-off-by: Jeremy Linton <jeremy.linton@arm.com>
> Reviewed-by: Andre Przywara <andre.przywara@arm.com>
> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
> [florian: patch the correct file]
> Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

Thanks for the backport, now applied.

greg k-h

^ permalink raw reply	[flat|nested] 2+ messages in thread

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