From: Ram Pai <linuxram@us.ibm.com>
To: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org,
linux-arch@vger.kernel.org, linux-mm@kvack.org, x86@kernel.org,
linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org
Cc: benh@kernel.crashing.org, paulus@samba.org, mpe@ellerman.id.au,
khandual@linux.vnet.ibm.com, aneesh.kumar@linux.vnet.ibm.com,
bsingharora@gmail.com, dave.hansen@intel.com, hbabu@us.ibm.com,
linuxram@us.ibm.com, arnd@arndb.de, akpm@linux-foundation.org,
corbet@lwn.net, mingo@redhat.com
Subject: [RFC v4 05/17] powerpc: store and restore the pkey state across context switches
Date: Tue, 27 Jun 2017 03:11:47 -0700 [thread overview]
Message-ID: <1498558319-32466-6-git-send-email-linuxram@us.ibm.com> (raw)
In-Reply-To: <1498558319-32466-1-git-send-email-linuxram@us.ibm.com>
Store and restore the AMR, IAMR and UMOR register state of the task
before scheduling out and after scheduling in, respectively.
Signed-off-by: Ram Pai <linuxram@us.ibm.com>
---
arch/powerpc/include/asm/processor.h | 5 +++++
arch/powerpc/kernel/process.c | 18 ++++++++++++++++++
2 files changed, 23 insertions(+)
diff --git a/arch/powerpc/include/asm/processor.h b/arch/powerpc/include/asm/processor.h
index a2123f2..1f714df 100644
--- a/arch/powerpc/include/asm/processor.h
+++ b/arch/powerpc/include/asm/processor.h
@@ -310,6 +310,11 @@ struct thread_struct {
struct thread_vr_state ckvr_state; /* Checkpointed VR state */
unsigned long ckvrsave; /* Checkpointed VRSAVE */
#endif /* CONFIG_PPC_TRANSACTIONAL_MEM */
+#ifdef CONFIG_PPC64_MEMORY_PROTECTION_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 baae104..37d001a 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -1096,6 +1096,11 @@ static inline void save_sprs(struct thread_struct *t)
t->tar = mfspr(SPRN_TAR);
}
#endif
+#ifdef CONFIG_PPC64_MEMORY_PROTECTION_KEYS
+ t->amr = mfspr(SPRN_AMR);
+ t->iamr = mfspr(SPRN_IAMR);
+ t->uamor = mfspr(SPRN_UAMOR);
+#endif
}
static inline void restore_sprs(struct thread_struct *old_thread,
@@ -1131,6 +1136,14 @@ static inline void restore_sprs(struct thread_struct *old_thread,
mtspr(SPRN_TAR, new_thread->tar);
}
#endif
+#ifdef CONFIG_PPC64_MEMORY_PROTECTION_KEYS
+ if (old_thread->amr != new_thread->amr)
+ mtspr(SPRN_AMR, new_thread->amr);
+ if (old_thread->iamr != new_thread->iamr)
+ mtspr(SPRN_IAMR, new_thread->iamr);
+ if (old_thread->uamor != new_thread->uamor)
+ mtspr(SPRN_UAMOR, new_thread->uamor);
+#endif
}
struct task_struct *__switch_to(struct task_struct *prev,
@@ -1686,6 +1699,11 @@ void start_thread(struct pt_regs *regs, unsigned long start, unsigned long sp)
current->thread.tm_texasr = 0;
current->thread.tm_tfiar = 0;
#endif /* CONFIG_PPC_TRANSACTIONAL_MEM */
+#ifdef CONFIG_PPC64_MEMORY_PROTECTION_KEYS
+ current->thread.amr = 0x0ul;
+ current->thread.iamr = 0x0ul;
+ current->thread.uamor = 0x0ul;
+#endif /* CONFIG_PPC64_MEMORY_PROTECTION_KEYS */
}
EXPORT_SYMBOL(start_thread);
--
1.8.3.1
--
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next prev parent reply other threads:[~2017-06-27 10:12 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-27 10:11 [RFC v4 00/17] powerpc: Memory Protection Keys Ram Pai
2017-06-27 10:11 ` [RFC v4 01/17] mm: introduce an additional vma bit for powerpc pkey Ram Pai
2017-06-27 10:54 ` Balbir Singh
2017-06-27 10:11 ` [RFC v4 02/17] mm: ability to disable execute permission on a key at creation Ram Pai
2017-06-27 11:32 ` Balbir Singh
2017-06-27 10:11 ` [RFC v4 03/17] x86: key creation with PKEY_DISABLE_EXECUTE disallowed Ram Pai
2017-06-27 11:32 ` Balbir Singh
2017-06-27 10:11 ` [RFC v4 04/17] powerpc: Implement sys_pkey_alloc and sys_pkey_free system call Ram Pai
2017-06-27 10:11 ` Ram Pai [this message]
2017-06-27 10:11 ` [RFC v4 06/17] powerpc: Implementation for sys_mprotect_pkey() " Ram Pai
2017-06-27 10:11 ` [RFC v4 07/17] powerpc: make the hash functions protection-key aware Ram Pai
2017-06-27 10:11 ` [RFC v4 08/17] powerpc: Program HPTE key protection bits Ram Pai
2017-06-27 10:11 ` [RFC v4 09/17] powerpc: call the hash functions with the correct pkey value Ram Pai
2017-06-27 15:24 ` Aneesh Kumar K.V
2017-06-28 7:12 ` Ram Pai
2017-06-27 10:11 ` [RFC v4 10/17] powerpc: Macro the mask used for checking DSI exception Ram Pai
2017-06-27 10:11 ` [RFC v4 11/17] powerpc: Handle exceptions caused by pkey violation Ram Pai
2017-06-27 10:11 ` [RFC v4 12/17] powerpc: Deliver SEGV signal on " Ram Pai
2017-06-27 10:11 ` [RFC v4 13/17] selftest: Move protecton key selftest to arch neutral directory Ram Pai
2017-06-27 10:11 ` [RFC v4 14/17] selftest: PowerPC specific test updates to memory protection keys Ram Pai
2017-06-27 10:11 ` [RFC v4 15/17] Documentation: Move protecton key documentation to arch neutral directory Ram Pai
2017-06-27 10:11 ` [RFC v4 16/17] Documentation: PowerPC specific updates to memory protection keys Ram Pai
2017-06-27 10:11 ` [RFC v4 17/17] procfs: display the protection-key number associated with a vma Ram Pai
2017-06-28 1:50 ` Michael Ellerman
2017-06-27 10:46 ` [RFC v4 00/17] powerpc: Memory Protection Keys Balbir Singh
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