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x86/cpufeatures: Disentangle SSBD enumeration

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The SSBD enumeration is similarly to the other bits magically shared
between Intel and AMD though the mechanisms are different.

Make X86_FEATURE_SSBD synthetic and set it depending on the vendor specific
features or family dependent setup.

Change the Intel bit to X86_FEATURE_SPEC_CTRL_SSBD to denote that SSBD is
controlled via MSR_SPEC_CTRL and fix up the usage sites.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Thomas Gleixner
2018-05-10 20:21:36 +02:00
parent 7eb8956a7f
commit 52817587e7
6 changed files with 14 additions and 16 deletions
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3
arch/x86/kernel/cpu/common.c
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@@ -767,6 +767,9 @@ static void init_speculation_control(struct cpuinfo_x86 *c)
if (cpu_has(c, X86_FEATURE_INTEL_STIBP))
set_cpu_cap(c, X86_FEATURE_STIBP);
if (cpu_has(c, X86_FEATURE_SPEC_CTRL_SSBD))
set_cpu_cap(c, X86_FEATURE_SSBD);
if (cpu_has(c, X86_FEATURE_AMD_IBRS)) {
set_cpu_cap(c, X86_FEATURE_IBRS);
set_cpu_cap(c, X86_FEATURE_MSR_SPEC_CTRL);