Commit-ID: 845d382bb15c6e7dc5026c0ff919c5b13fc7e11b Gitweb: https://git.kernel.org/tip/845d382bb15c6e7dc5026c0ff919c5b13fc7e11b Author: Tom Lendacky <[email protected]> AuthorDate: Mon, 2 Jul 2018 16:35:53 -0500 Committer: Ingo Molnar <[email protected]> CommitDate: Tue, 3 Jul 2018 09:45:48 +0200
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]> --- arch/x86/kernel/cpu/amd.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c index 082d7875cef8..38915fbfae73 100644 --- 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) {
