#define X86_FEATURE_RETPOLINE ( 7*32+29) /* "" Generic Retpoline mitigation for Spectre variant 2 */
#define X86_FEATURE_RETPOLINE_AMD ( 7*32+30) /* "" AMD Retpoline mitigation for Spectre variant 2 */
+
+#define X86_FEATURE_MSR_SPEC_CTRL ( 7*32+16) /* "" MSR SPEC_CTRL is implemented */
+
/* Because the ALTERNATIVE scheme is for members of the X86_FEATURE club... */
#define X86_FEATURE_KAISER ( 7*32+31) /* CONFIG_PAGE_TABLE_ISOLATION w/o nokaiser */
* have unknown values. AMD64_LS_CFG MSR is cached in the early AMD
* init code as it is not enumerated and depends on the family.
*/
- if (boot_cpu_has(X86_FEATURE_IBRS))
+ if (boot_cpu_has(X86_FEATURE_MSR_SPEC_CTRL))
rdmsrl(MSR_IA32_SPEC_CTRL, x86_spec_ctrl_base);
/* Select the proper spectre mitigation before patching alternatives */
{
u64 msrval = x86_spec_ctrl_base;
- if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL)
+ if (static_cpu_has(X86_FEATURE_SPEC_CTRL))
msrval |= ssbd_tif_to_spec_ctrl(current_thread_info()->flags);
return msrval;
}
{
u64 host = x86_spec_ctrl_base;
- if (!boot_cpu_has(X86_FEATURE_IBRS))
+ /* Is MSR_SPEC_CTRL implemented ? */
+ if (!static_cpu_has(X86_FEATURE_MSR_SPEC_CTRL))
return;
- if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL)
+ /* Intel controls SSB in MSR_SPEC_CTRL */
+ if (static_cpu_has(X86_FEATURE_SPEC_CTRL))
host |= ssbd_tif_to_spec_ctrl(current_thread_info()->flags);
if (host != guest_spec_ctrl)
{
u64 host = x86_spec_ctrl_base;
- if (!boot_cpu_has(X86_FEATURE_IBRS))
+ /* Is MSR_SPEC_CTRL implemented ? */
+ if (!static_cpu_has(X86_FEATURE_MSR_SPEC_CTRL))
return;
- if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL)
+ /* Intel controls SSB in MSR_SPEC_CTRL */
+ if (static_cpu_has(X86_FEATURE_SPEC_CTRL))
host |= ssbd_tif_to_spec_ctrl(current_thread_info()->flags);
if (host != guest_spec_ctrl)
void x86_spec_ctrl_setup_ap(void)
{
- if (boot_cpu_has(X86_FEATURE_IBRS))
+ if (boot_cpu_has(X86_FEATURE_MSR_SPEC_CTRL))
x86_spec_ctrl_set(x86_spec_ctrl_base & ~x86_spec_ctrl_mask);
if (ssb_mode == SPEC_STORE_BYPASS_DISABLE)
if (cpu_has(c, X86_FEATURE_SPEC_CTRL)) {
set_cpu_cap(c, X86_FEATURE_IBRS);
set_cpu_cap(c, X86_FEATURE_IBPB);
+ set_cpu_cap(c, X86_FEATURE_MSR_SPEC_CTRL);
}
if (cpu_has(c, X86_FEATURE_INTEL_STIBP))
set_cpu_cap(c, X86_FEATURE_STIBP);
- if (cpu_has(c, X86_FEATURE_AMD_IBRS))
+ if (cpu_has(c, X86_FEATURE_AMD_IBRS)) {
set_cpu_cap(c, X86_FEATURE_IBRS);
+ set_cpu_cap(c, X86_FEATURE_MSR_SPEC_CTRL);
+ }
if (cpu_has(c, X86_FEATURE_AMD_IBPB))
set_cpu_cap(c, X86_FEATURE_IBPB);
- if (cpu_has(c, X86_FEATURE_AMD_STIBP))
+ if (cpu_has(c, X86_FEATURE_AMD_STIBP)) {
set_cpu_cap(c, X86_FEATURE_STIBP);
+ set_cpu_cap(c, X86_FEATURE_MSR_SPEC_CTRL);
+ }
}
void get_cpu_cap(struct cpuinfo_x86 *c)