[PATCH v8 7/8] kvm, mem-hotplug: Add arch specific mmu notifier to handle apic access migration.
From: Tang Chen
Date: Wed Sep 24 2014 - 03:59:04 EST
We are handling "L1 and L2 share one apic access page" situation when migrating
apic access page. We should do some handling when migration happens in the
following situations:
1) when L0 is running: Update L1's vmcs in the next L0->L1 entry and L2's
vmcs in the next L1->L2 entry.
2) when L1 is running: Force a L1->L0 exit, update L1's vmcs in the next
L0->L1 entry and L2's vmcs in the next L1->L2 entry.
3) when L2 is running: Force a L2->L0 exit, update L2's vmcs in the next
L0->L2 entry and L1's vmcs in the next L2->L1 exit.
This patch force a L1->L0 exit or L2->L0 exit when shared apic access page is
migrated using mmu notifier. Since apic access page is only used on intel x86,
this is arch specific code.
Signed-off-by: Tang Chen <tangchen@xxxxxxxxxxxxxx>
---
arch/arm/include/asm/kvm_host.h | 5 +++++
arch/arm64/include/asm/kvm_host.h | 5 +++++
arch/ia64/include/asm/kvm_host.h | 7 +++++++
arch/mips/include/asm/kvm_host.h | 6 ++++++
arch/powerpc/include/asm/kvm_host.h | 5 +++++
arch/s390/include/asm/kvm_host.h | 8 ++++++++
arch/x86/include/asm/kvm_host.h | 2 ++
arch/x86/kvm/x86.c | 11 +++++++++++
virt/kvm/kvm_main.c | 3 +++
9 files changed, 52 insertions(+)
diff --git a/arch/arm/include/asm/kvm_host.h b/arch/arm/include/asm/kvm_host.h
index 6dfb404..f5b3f53 100644
--- a/arch/arm/include/asm/kvm_host.h
+++ b/arch/arm/include/asm/kvm_host.h
@@ -182,6 +182,11 @@ static inline int kvm_test_age_hva(struct kvm *kvm, unsigned long hva)
return 0;
}
+static inline void kvm_arch_mmu_notifier_invalidate_page(struct kvm *kvm,
+ unsigned long address)
+{
+}
+
struct kvm_vcpu *kvm_arm_get_running_vcpu(void);
struct kvm_vcpu __percpu **kvm_get_running_vcpus(void);
diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index e10c45a..594873a 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -192,6 +192,11 @@ static inline int kvm_test_age_hva(struct kvm *kvm, unsigned long hva)
return 0;
}
+static inline void kvm_arch_mmu_notifier_invalidate_page(struct kvm *kvm,
+ unsigned long address)
+{
+}
+
struct kvm_vcpu *kvm_arm_get_running_vcpu(void);
struct kvm_vcpu __percpu **kvm_get_running_vcpus(void);
diff --git a/arch/ia64/include/asm/kvm_host.h b/arch/ia64/include/asm/kvm_host.h
index db95f57..282e71f 100644
--- a/arch/ia64/include/asm/kvm_host.h
+++ b/arch/ia64/include/asm/kvm_host.h
@@ -574,6 +574,13 @@ static inline struct kvm_pt_regs *vcpu_regs(struct kvm_vcpu *v)
return (struct kvm_pt_regs *) ((unsigned long) v + KVM_STK_OFFSET) - 1;
}
+#ifdef KVM_ARCH_WANT_MMU_NOTIFIER
+static inline void kvm_arch_mmu_notifier_invalidate_page(struct kvm *kvm,
+ unsigned long address)
+{
+}
+#endif /* KVM_ARCH_WANT_MMU_NOTIFIER */
+
typedef int kvm_vmm_entry(void);
typedef void kvm_tramp_entry(union context *host, union context *guest);
diff --git a/arch/mips/include/asm/kvm_host.h b/arch/mips/include/asm/kvm_host.h
index 7a3fc67..4826d29 100644
--- a/arch/mips/include/asm/kvm_host.h
+++ b/arch/mips/include/asm/kvm_host.h
@@ -767,5 +767,11 @@ extern int kvm_mips_trans_mtc0(uint32_t inst, uint32_t *opc,
extern void kvm_mips_dump_stats(struct kvm_vcpu *vcpu);
extern unsigned long kvm_mips_get_ramsize(struct kvm *kvm);
+#ifdef KVM_ARCH_WANT_MMU_NOTIFIER
+static inline void kvm_arch_mmu_notifier_invalidate_page(struct kvm *kvm,
+ unsigned long address)
+{
+}
+#endif /* KVM_ARCH_WANT_MMU_NOTIFIER */
#endif /* __MIPS_KVM_HOST_H__ */
diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
index 98d9dd5..e40402d 100644
--- a/arch/powerpc/include/asm/kvm_host.h
+++ b/arch/powerpc/include/asm/kvm_host.h
@@ -61,6 +61,11 @@ extern int kvm_age_hva(struct kvm *kvm, unsigned long hva);
extern int kvm_test_age_hva(struct kvm *kvm, unsigned long hva);
extern void kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte);
+static inline void kvm_arch_mmu_notifier_invalidate_page(struct kvm *kvm,
+ unsigned long address)
+{
+}
+
#define HPTEG_CACHE_NUM (1 << 15)
#define HPTEG_HASH_BITS_PTE 13
#define HPTEG_HASH_BITS_PTE_LONG 12
diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h
index 773bef7..e4d6708 100644
--- a/arch/s390/include/asm/kvm_host.h
+++ b/arch/s390/include/asm/kvm_host.h
@@ -450,4 +450,12 @@ void kvm_arch_async_page_present(struct kvm_vcpu *vcpu,
extern int sie64a(struct kvm_s390_sie_block *, u64 *);
extern char sie_exit;
+
+#ifdef KVM_ARCH_WANT_MMU_NOTIFIER
+static inline void kvm_arch_mmu_notifier_invalidate_page(struct kvm *kvm,
+ unsigned long address)
+{
+}
+#endif /* KVM_ARCH_WANT_MMU_NOTIFIER */
+
#endif
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 66480fd..408b944 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1047,6 +1047,8 @@ int kvm_arch_interrupt_allowed(struct kvm_vcpu *vcpu);
int kvm_cpu_get_interrupt(struct kvm_vcpu *v);
void kvm_vcpu_reset(struct kvm_vcpu *vcpu);
void kvm_vcpu_reload_apic_access_page(struct kvm_vcpu *vcpu);
+void kvm_arch_mmu_notifier_invalidate_page(struct kvm *kvm,
+ unsigned long address);
void kvm_define_shared_msr(unsigned index, u32 msr);
void kvm_set_shared_msr(unsigned index, u64 val, u64 mask);
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index c064ca6..e042ef6 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -6011,6 +6011,17 @@ void kvm_vcpu_reload_apic_access_page(struct kvm_vcpu *vcpu)
}
EXPORT_SYMBOL_GPL(kvm_vcpu_reload_apic_access_page);
+void kvm_arch_mmu_notifier_invalidate_page(struct kvm *kvm,
+ unsigned long address)
+{
+ /*
+ * The physical address of apic access page is stored in VMCS.
+ * Update it when it becomes invalid.
+ */
+ if (address == gfn_to_hva(kvm, APIC_DEFAULT_PHYS_BASE >> PAGE_SHIFT))
+ kvm_make_all_cpus_request(kvm, KVM_REQ_APIC_PAGE_RELOAD);
+}
+
/*
* Returns 1 to let __vcpu_run() continue the guest execution loop without
* exiting to the userspace. Otherwise, the value will be returned to the
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 0f8b6f6..5427973d 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -295,6 +295,9 @@ static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier *mn,
kvm_flush_remote_tlbs(kvm);
spin_unlock(&kvm->mmu_lock);
+
+ kvm_arch_mmu_notifier_invalidate_page(kvm, address);
+
srcu_read_unlock(&kvm->srcu, idx);
}
--
1.8.3.1
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