+#undef pr_fmt
+#define pr_fmt(fmt) "L1D Flush : " fmt
+
+enum l1d_flush_mitigations {
+ L1D_FLUSH_OFF = 0,
+ L1D_FLUSH_ON,
+};
+
+static enum l1d_flush_mitigations l1d_flush_mitigation __initdata = L1D_FLUSH_OFF;
+
+static void __init l1d_flush_select_mitigation(void)
+{
+ if (!l1d_flush_mitigation || !boot_cpu_has(X86_FEATURE_FLUSH_L1D))
+ return;
+
+ static_branch_enable(&switch_mm_cond_l1d_flush);
+ pr_info("Conditional flush on switch_mm() enabled\n");
+}
+
+static int __init l1d_flush_parse_cmdline(char *str)
+{
+ if (!strcmp(str, "on"))
+ l1d_flush_mitigation = L1D_FLUSH_ON;
+
+ return 0;
+}
+early_param("l1d_flush", l1d_flush_parse_cmdline);
+