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x86/speculation/mds: Add 'mitigations=' support for MDS

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commit 5c14068f87 upstream.

Add MDS to the new 'mitigations=' cmdline option.

Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
[bwh: Backported to 4.4:
 - Drop the auto,nosmt option, which we can't support
 - Adjust filenames, context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Josh Poimboeuf
2019-04-17 16:39:02 -05:00
committed by Greg Kroah-Hartman
parent a50e2ca575
commit 3092ad5c4f
2 changed files with 2 additions and 1 deletions
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1
Documentation/kernel-parameters.txt
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@@ -2187,6 +2187,7 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
nospectre_v2 [X86]
spectre_v2_user=off [X86]
spec_store_bypass_disable=off [X86]
mds=off [X86]
auto (default)
Mitigate all CPU vulnerabilities, but leave SMT

2
arch/x86/kernel/cpu/bugs.c
View File

@@ -221,7 +221,7 @@ static const char * const mds_strings[] = {
static void __init mds_select_mitigation(void)
{
if (!boot_cpu_has_bug(X86_BUG_MDS)) {
if (!boot_cpu_has_bug(X86_BUG_MDS) || cpu_mitigations_off()) {
mds_mitigation = MDS_MITIGATION_OFF;
return;
}