4.14-stable review patch. If anyone has any objections, please let me know.
------------------ From: Konrad Rzeszutek Wilk [email protected] commit 108fab4b5c8f12064ef86e02cb0459992affb30f upstream Both AMD and Intel can have SPEC_CTRL_MSR for SSBD. However AMD also has two more other ways of doing it - which are !SPEC_CTRL MSR ways. Signed-off-by: Konrad Rzeszutek Wilk <[email protected]> Signed-off-by: Thomas Gleixner <[email protected]> Cc: Kees Cook <[email protected]> Cc: [email protected] Cc: KarimAllah Ahmed <[email protected]> Cc: [email protected] Cc: "H. Peter Anvin" <[email protected]> Cc: Borislav Petkov <[email protected]> Cc: David Woodhouse <[email protected]> Link: https://lkml.kernel.org/r/[email protected] Signed-off-by: Greg Kroah-Hartman <[email protected]> --- arch/x86/kernel/cpu/bugs.c | 11 +++-------- 1 file changed, 3 insertions(+), 8 deletions(-) --- a/arch/x86/kernel/cpu/bugs.c +++ b/arch/x86/kernel/cpu/bugs.c @@ -535,17 +535,12 @@ static enum ssb_mitigation __init __ssb_ * Intel uses the SPEC CTRL MSR Bit(2) for this, while AMD may * use a completely different MSR and bit dependent on family. */ - switch (boot_cpu_data.x86_vendor) { - case X86_VENDOR_INTEL: - case X86_VENDOR_AMD: - if (!static_cpu_has(X86_FEATURE_MSR_SPEC_CTRL)) { - x86_amd_ssb_disable(); - break; - } + if (!static_cpu_has(X86_FEATURE_MSR_SPEC_CTRL)) + x86_amd_ssb_disable(); + else { x86_spec_ctrl_base |= SPEC_CTRL_SSBD; x86_spec_ctrl_mask |= SPEC_CTRL_SSBD; wrmsrl(MSR_IA32_SPEC_CTRL, x86_spec_ctrl_base); - break; } }
