x86/bugs: Update when to check for the LS_CFG SSBD mitigation

If either the X86_FEATURE_AMD_SSBD or X86_FEATURE_VIRT_SSBD features are
present, then there is no need to perform the check for the LS_CFG SSBD
mitigation support.

Signed-off-by: Tom Lendacky <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: David Woodhouse <[email protected]>
Cc: Konrad Rzeszutek Wilk <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>

diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
index 082d7875cef82eb779b68e5105330482f5a419d8..38915fbfae73d5cfeacbf16624fa49cb9edc7ec7 100644 (file)
--- a/arch/x86/kernel/cpu/amd.c
+++ b/arch/x86/kernel/cpu/amd.c
@@ -543,7 +543,9 @@ static void bsp_init_amd(struct cpuinfo_x86 *c)
                nodes_per_socket = ((value >> 3) & 7) + 1;
        }
 
-       if (c->x86 >= 0x15 && c->x86 <= 0x17) {
+       if (!boot_cpu_has(X86_FEATURE_AMD_SSBD) &&
+           !boot_cpu_has(X86_FEATURE_VIRT_SSBD) &&
+           c->x86 >= 0x15 && c->x86 <= 0x17) {
                unsigned int bit;
 
                switch (c->x86) {