summaryrefslogtreecommitdiff
path: root/arch/x86/include/asm/nospec-branch.h
diff options
context:
space:
mode:
Diffstat (limited to 'arch/x86/include/asm/nospec-branch.h')
-rw-r--r--arch/x86/include/asm/nospec-branch.h25
1 files changed, 25 insertions, 0 deletions
diff --git a/arch/x86/include/asm/nospec-branch.h b/arch/x86/include/asm/nospec-branch.h
index dad12b767ba0..67cb9b2082b1 100644
--- a/arch/x86/include/asm/nospec-branch.h
+++ b/arch/x86/include/asm/nospec-branch.h
@@ -318,6 +318,31 @@ DECLARE_STATIC_KEY_FALSE(switch_to_cond_stibp);
DECLARE_STATIC_KEY_FALSE(switch_mm_cond_ibpb);
DECLARE_STATIC_KEY_FALSE(switch_mm_always_ibpb);
+#include <asm/segment.h>
+
+/**
+ * mds_clear_cpu_buffers - Mitigation for MDS vulnerability
+ *
+ * This uses the otherwise unused and obsolete VERW instruction in
+ * combination with microcode which triggers a CPU buffer flush when the
+ * instruction is executed.
+ */
+static inline void mds_clear_cpu_buffers(void)
+{
+ static const u16 ds = __KERNEL_DS;
+
+ /*
+ * Has to be the memory-operand variant because only that
+ * guarantees the CPU buffer flush functionality according to
+ * documentation. The register-operand variant does not.
+ * Works with any segment selector, but a valid writable
+ * data segment is the fastest variant.
+ *
+ * "cc" clobber is required because VERW modifies ZF.
+ */
+ asm volatile("verw %[ds]" : : [ds] "m" (ds) : "cc");
+}
+
#endif /* __ASSEMBLY__ */
/*