SPECTRE_V2_IBRS,
};
-/*
- * The Intel specification for the SPEC_CTRL MSR requires that we
- * preserve any already set reserved bits at boot time (e.g. for
- * future additions that this kernel is not currently aware of).
- * We then set any additional mitigation bits that we want
- * ourselves and always use this as the base for SPEC_CTRL.
- * We also use this when handling guest entry/exit as below.
- */
extern void x86_spec_ctrl_set(u64);
-extern u64 x86_spec_ctrl_get_default(void);
/* The Speculative Store Bypass disable variants */
enum ssb_mitigation {
alternative_msr_write(MSR_IA32_PRED_CMD, val, X86_FEATURE_USE_IBPB);
}
+/* The Intel SPEC CTRL MSR base value cache */
+extern u64 x86_spec_ctrl_base;
+
/*
* With retpoline, we must use IBRS to restrict branch prediction
* before calling into firmware.
*/
#define firmware_restrict_branch_speculation_start() \
do { \
- u64 val = x86_spec_ctrl_get_default() | SPEC_CTRL_IBRS; \
+ u64 val = x86_spec_ctrl_base | SPEC_CTRL_IBRS; \
\
preempt_disable(); \
alternative_msr_write(MSR_IA32_SPEC_CTRL, val, \
#define firmware_restrict_branch_speculation_end() \
do { \
- u64 val = x86_spec_ctrl_get_default(); \
+ u64 val = x86_spec_ctrl_base; \
\
alternative_msr_write(MSR_IA32_SPEC_CTRL, val, \
X86_FEATURE_USE_IBRS_FW); \
extern u64 x86_amd_ls_cfg_base;
extern u64 x86_amd_ls_cfg_ssbd_mask;
-/* The Intel SPEC CTRL MSR base value cache */
-extern u64 x86_spec_ctrl_base;
-
static inline u64 ssbd_tif_to_spec_ctrl(u64 tifn)
{
BUILD_BUG_ON(TIF_SSBD < SPEC_CTRL_SSBD_SHIFT);
* writes to SPEC_CTRL contain whatever reserved bits have been set.
*/
u64 x86_spec_ctrl_base;
+EXPORT_SYMBOL_GPL(x86_spec_ctrl_base);
/*
* The vendor and possibly platform specific bits which can be modified in
}
EXPORT_SYMBOL_GPL(x86_spec_ctrl_set);
-u64 x86_spec_ctrl_get_default(void)
-{
- u64 msrval = x86_spec_ctrl_base;
-
- if (static_cpu_has(X86_FEATURE_SPEC_CTRL))
- msrval |= ssbd_tif_to_spec_ctrl(current_thread_info()->flags);
- return msrval;
-}
-EXPORT_SYMBOL_GPL(x86_spec_ctrl_get_default);
-
void
x86_virt_spec_ctrl(u64 guest_spec_ctrl, u64 guest_virt_spec_ctrl, bool setguest)
{