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authorRam Pai <linuxram@us.ibm.com>2018-01-18 17:50:31 -0800
committerMichael Ellerman <mpe@ellerman.id.au>2018-01-20 22:59:00 +1100
commit06bb53b33804613627c7ca1eda246459a7be2803 (patch)
tree61428a22fe89565f607bf32480a6173255fb8c7b /arch
parentdcf872956d444bbbd46f601024ea989ced03f8a7 (diff)
powerpc: store and restore the pkey state across context switches
Store and restore the AMR, IAMR and UAMOR register state of the task before scheduling out and after scheduling in, respectively. Signed-off-by: Ram Pai <linuxram@us.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch')
-rw-r--r--arch/powerpc/include/asm/mmu_context.h3
-rw-r--r--arch/powerpc/include/asm/pkeys.h4
-rw-r--r--arch/powerpc/include/asm/processor.h5
-rw-r--r--arch/powerpc/kernel/process.c7
-rw-r--r--arch/powerpc/mm/pkeys.c52
5 files changed, 70 insertions, 1 deletions
diff --git a/arch/powerpc/include/asm/mmu_context.h b/arch/powerpc/include/asm/mmu_context.h
index 7d0f2d05189b..4d69223d217a 100644
--- a/arch/powerpc/include/asm/mmu_context.h
+++ b/arch/powerpc/include/asm/mmu_context.h
@@ -195,6 +195,9 @@ static inline bool arch_vma_access_permitted(struct vm_area_struct *vma,
#ifndef CONFIG_PPC_MEM_KEYS
#define pkey_mm_init(mm)
+#define thread_pkey_regs_save(thread)
+#define thread_pkey_regs_restore(new_thread, old_thread)
+#define thread_pkey_regs_init(thread)
#endif /* CONFIG_PPC_MEM_KEYS */
#endif /* __KERNEL__ */
diff --git a/arch/powerpc/include/asm/pkeys.h b/arch/powerpc/include/asm/pkeys.h
index bf8e706dcb0f..41c303a01e1a 100644
--- a/arch/powerpc/include/asm/pkeys.h
+++ b/arch/powerpc/include/asm/pkeys.h
@@ -139,4 +139,8 @@ static inline int arch_set_user_pkey_access(struct task_struct *tsk, int pkey,
}
extern void pkey_mm_init(struct mm_struct *mm);
+extern void thread_pkey_regs_save(struct thread_struct *thread);
+extern void thread_pkey_regs_restore(struct thread_struct *new_thread,
+ struct thread_struct *old_thread);
+extern void thread_pkey_regs_init(struct thread_struct *thread);
#endif /*_ASM_POWERPC_KEYS_H */
diff --git a/arch/powerpc/include/asm/processor.h b/arch/powerpc/include/asm/processor.h
index bdab3b74eb98..01299cdc9806 100644
--- a/arch/powerpc/include/asm/processor.h
+++ b/arch/powerpc/include/asm/processor.h
@@ -309,6 +309,11 @@ struct thread_struct {
struct thread_vr_state ckvr_state; /* Checkpointed VR state */
unsigned long ckvrsave; /* Checkpointed VRSAVE */
#endif /* CONFIG_PPC_TRANSACTIONAL_MEM */
+#ifdef CONFIG_PPC_MEM_KEYS
+ unsigned long amr;
+ unsigned long iamr;
+ unsigned long uamor;
+#endif
#ifdef CONFIG_KVM_BOOK3S_32_HANDLER
void* kvm_shadow_vcpu; /* KVM internal data */
#endif /* CONFIG_KVM_BOOK3S_32_HANDLER */
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index 9eb78ec0ce5b..755fd7e23ed4 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -42,6 +42,7 @@
#include <linux/hw_breakpoint.h>
#include <linux/uaccess.h>
#include <linux/elf-randomize.h>
+#include <linux/pkeys.h>
#include <asm/pgtable.h>
#include <asm/io.h>
@@ -1103,6 +1104,8 @@ static inline void save_sprs(struct thread_struct *t)
t->tar = mfspr(SPRN_TAR);
}
#endif
+
+ thread_pkey_regs_save(t);
}
static inline void restore_sprs(struct thread_struct *old_thread,
@@ -1142,6 +1145,8 @@ static inline void restore_sprs(struct thread_struct *old_thread,
old_thread->tidr != new_thread->tidr)
mtspr(SPRN_TIDR, new_thread->tidr);
#endif
+
+ thread_pkey_regs_restore(new_thread, old_thread);
}
#ifdef CONFIG_PPC_BOOK3S_64
@@ -1867,6 +1872,8 @@ void start_thread(struct pt_regs *regs, unsigned long start, unsigned long sp)
current->thread.tm_tfiar = 0;
current->thread.load_tm = 0;
#endif /* CONFIG_PPC_TRANSACTIONAL_MEM */
+
+ thread_pkey_regs_init(&current->thread);
}
EXPORT_SYMBOL(start_thread);
diff --git a/arch/powerpc/mm/pkeys.c b/arch/powerpc/mm/pkeys.c
index e61bea4a3606..91ec6c467074 100644
--- a/arch/powerpc/mm/pkeys.c
+++ b/arch/powerpc/mm/pkeys.c
@@ -12,6 +12,8 @@ DEFINE_STATIC_KEY_TRUE(pkey_disabled);
bool pkey_execute_disable_supported;
int pkeys_total; /* Total pkeys as per device tree */
u32 initial_allocation_mask; /* Bits set for reserved keys */
+u64 pkey_amr_uamor_mask; /* Bits in AMR/UMOR not to be touched */
+u64 pkey_iamr_mask; /* Bits in AMR not to be touched */
#define AMR_BITS_PER_PKEY 2
#define AMR_RD_BIT 0x1UL
@@ -70,8 +72,16 @@ int pkey_initialize(void)
* programming note.
*/
initial_allocation_mask = ~0x0;
- for (i = 2; i < (pkeys_total - os_reserved); i++)
+
+ /* register mask is in BE format */
+ pkey_amr_uamor_mask = ~0x0ul;
+ pkey_iamr_mask = ~0x0ul;
+
+ for (i = 2; i < (pkeys_total - os_reserved); i++) {
initial_allocation_mask &= ~(0x1 << i);
+ pkey_amr_uamor_mask &= ~(0x3ul << pkeyshift(i));
+ pkey_iamr_mask &= ~(0x1ul << pkeyshift(i));
+ }
return 0;
}
@@ -206,3 +216,43 @@ int __arch_set_user_pkey_access(struct task_struct *tsk, int pkey,
init_amr(pkey, new_amr_bits);
return 0;
}
+
+void thread_pkey_regs_save(struct thread_struct *thread)
+{
+ if (static_branch_likely(&pkey_disabled))
+ return;
+
+ /*
+ * TODO: Skip saving registers if @thread hasn't used any keys yet.
+ */
+ thread->amr = read_amr();
+ thread->iamr = read_iamr();
+ thread->uamor = read_uamor();
+}
+
+void thread_pkey_regs_restore(struct thread_struct *new_thread,
+ struct thread_struct *old_thread)
+{
+ if (static_branch_likely(&pkey_disabled))
+ return;
+
+ /*
+ * TODO: Just set UAMOR to zero if @new_thread hasn't used any keys yet.
+ */
+ if (old_thread->amr != new_thread->amr)
+ write_amr(new_thread->amr);
+ if (old_thread->iamr != new_thread->iamr)
+ write_iamr(new_thread->iamr);
+ if (old_thread->uamor != new_thread->uamor)
+ write_uamor(new_thread->uamor);
+}
+
+void thread_pkey_regs_init(struct thread_struct *thread)
+{
+ if (static_branch_likely(&pkey_disabled))
+ return;
+
+ write_amr(read_amr() & pkey_amr_uamor_mask);
+ write_iamr(read_iamr() & pkey_iamr_mask);
+ write_uamor(read_uamor() & pkey_amr_uamor_mask);
+}