Commit 5c14068f authored by Josh Poimboeuf's avatar Josh Poimboeuf Committed by Thomas Gleixner

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

Add MDS to the new 'mitigations=' cmdline option.
Signed-off-by: default avatarJosh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent e9fee6fe
......@@ -2556,6 +2556,7 @@
spectre_v2_user=off [X86]
spec_store_bypass_disable=off [X86,PPC]
l1tf=off [X86]
mds=off [X86]
auto (default)
Mitigate all CPU vulnerabilities, but leave SMT
......@@ -2570,6 +2571,7 @@
if needed. This is for users who always want to
be fully mitigated, even if it means losing SMT.
Equivalent to: l1tf=flush,nosmt [X86]
mds=full,nosmt [X86]
mminit_loglevel=
[KNL] When CONFIG_DEBUG_MEMORY_INIT is set, this
......
......@@ -233,7 +233,7 @@ 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;
}
......@@ -244,7 +244,8 @@ static void __init mds_select_mitigation(void)
static_branch_enable(&mds_user_clear);
if (mds_nosmt && !boot_cpu_has(X86_BUG_MSBDS_ONLY))
if (!boot_cpu_has(X86_BUG_MSBDS_ONLY) &&
(mds_nosmt || cpu_mitigations_auto_nosmt()))
cpu_smt_disable(false);
}
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment