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x86/mtrr: Add comment for set_mtrr_state() serialization

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Add a comment about set_mtrr_state() needing serialization.

  [ bp: Touchups. ]

Suggested-by: Borislav Petkov <bp@alien8.de>
Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lore.kernel.org/r/20220820092533.29420-2-jgross@suse.com
This commit is contained in:
Juergen Gross
2022-10-04 10:10:08 +02:00
committed by Borislav Petkov
parent 1d30800c0c
commit 01c97c7303
1 changed files with 4 additions and 1 deletions
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5
arch/x86/kernel/cpu/mtrr/generic.c
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@@ -684,7 +684,10 @@ static u32 deftype_lo, deftype_hi;
/**
* set_mtrr_state - Set the MTRR state for this CPU.
*
* NOTE: The CPU must already be in a safe state for MTRR changes.
* NOTE: The CPU must already be in a safe state for MTRR changes, including
* measures that only a single CPU can be active in set_mtrr_state() in
* order to not be subject to races for usage of deftype_lo. This is
* accomplished by taking set_atomicity_lock.
* RETURNS: 0 if no changes made, else a mask indicating what was changed.
*/
static unsigned long set_mtrr_state(void)