The BP hardening helpers are an integral part of the Spectre-v2
mitigation, so move them into asm/spectre.h and inline the
arm64_get_bp_hardening_data() function at the same time.
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Quentin Perret <qperret@google.com>
Link: https://lore.kernel.org/r/20201113113847.21619-6-will@kernel.org
#define USER_ASID_FLAG (UL(1) << USER_ASID_BIT)
#define TTBR_ASID_MASK (UL(0xffff) << 48)
-#define BP_HARDEN_EL2_SLOTS 4
-#define __BP_HARDEN_HYP_VECS_SZ (BP_HARDEN_EL2_SLOTS * SZ_2K)
-
#ifndef __ASSEMBLY__
#include <linux/refcount.h>
return cpus_have_const_cap(ARM64_UNMAP_KERNEL_AT_EL0);
}
-typedef void (*bp_hardening_cb_t)(void);
-
-struct bp_hardening_data {
- int hyp_vectors_slot;
- bp_hardening_cb_t fn;
-};
-
-DECLARE_PER_CPU_READ_MOSTLY(struct bp_hardening_data, bp_hardening_data);
-
-static inline struct bp_hardening_data *arm64_get_bp_hardening_data(void)
-{
- return this_cpu_ptr(&bp_hardening_data);
-}
-
-static inline void arm64_apply_bp_hardening(void)
-{
- struct bp_hardening_data *d;
-
- if (!cpus_have_const_cap(ARM64_SPECTRE_V2))
- return;
-
- d = arm64_get_bp_hardening_data();
- if (d->fn)
- d->fn();
-}
-
extern void arm64_memblock_init(void);
extern void paging_init(void);
extern void bootmem_init(void);
#ifndef __ASM_SPECTRE_H
#define __ASM_SPECTRE_H
+#define BP_HARDEN_EL2_SLOTS 4
+#define __BP_HARDEN_HYP_VECS_SZ (BP_HARDEN_EL2_SLOTS * SZ_2K)
+
+#ifndef __ASSEMBLY__
+
+#include <linux/percpu.h>
+
#include <asm/cpufeature.h>
+#include <asm/virt.h>
/* Watch out, ordering is important here. */
enum mitigation_state {
struct task_struct;
+typedef void (*bp_hardening_cb_t)(void);
+
+struct bp_hardening_data {
+ int hyp_vectors_slot;
+ bp_hardening_cb_t fn;
+};
+
+DECLARE_PER_CPU_READ_MOSTLY(struct bp_hardening_data, bp_hardening_data);
+
+static inline void arm64_apply_bp_hardening(void)
+{
+ struct bp_hardening_data *d;
+
+ if (!cpus_have_const_cap(ARM64_SPECTRE_V2))
+ return;
+
+ d = this_cpu_ptr(&bp_hardening_data);
+ if (d->fn)
+ d->fn();
+}
+
enum mitigation_state arm64_get_spectre_v2_state(void);
bool has_spectre_v2(const struct arm64_cpu_capabilities *cap, int scope);
void spectre_v2_enable_mitigation(const struct arm64_cpu_capabilities *__unused);
void spectre_v4_enable_mitigation(const struct arm64_cpu_capabilities *__unused);
void spectre_v4_enable_task_mitigation(struct task_struct *tsk);
+#endif /* __ASSEMBLY__ */
#endif /* __ASM_SPECTRE_H */
*/
static void cpu_set_hyp_vector(void)
{
- struct bp_hardening_data *data = arm64_get_bp_hardening_data();
+ struct bp_hardening_data *data = this_cpu_ptr(&bp_hardening_data);
void *vect = kern_hyp_va(kvm_ksym_ref(__kvm_hyp_vector));
int slot = -1;
#include <asm/kvm_arm.h>
#include <asm/kvm_asm.h>
#include <asm/mmu.h>
+#include <asm/spectre.h>
.macro save_caller_saved_regs_vect
/* x0 and x1 were saved in the vector entry */