x86/bugs/AMD: Add support to disable RDS on Fam[15,16,17]h if requested

Browse source

AMD does not need the Speculative Store Bypass mitigation to be enabled.

The parameters for this are already available and can be done via MSR
C001_1020. Each family uses a different bit in that MSR for this.

[ tglx: Expose the bit mask via a variable and move the actual MSR fiddling
  	into the bugs code as that's the right thing to do and also required
	to prepare for dynamic enable/disable ]

Suggested-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Ingo Molnar <mingo@kernel.org>

...

This commit is contained in:

Konrad Rzeszutek Wilk 2018-04-25 22:04:24 -04:00 • committed by Thomas Gleixner

parent 1115a859f3

commit 764f3c2158

5 changed files with 61 additions and 1 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

1

arch/x86/include/asm/cpufeatures.h

View file

4

arch/x86/include/asm/nospec-branch.h

View file

26

arch/x86/kernel/cpu/amd.c

View file

27

arch/x86/kernel/cpu/bugs.c

View file

4

arch/x86/kernel/cpu/common.c

View file