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 <tangc...@cn.fujitsu.com>
---
arch/x86/kvm/x86.c | 11 +++++++++++
include/linux/kvm_host.h | 14 +++++++++++++-
virt/kvm/kvm_main.c | 3 +++
3 files changed, 27 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 2ae2dc7..7dd4179 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/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 73de13c..b6e4d38 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -917,7 +917,19 @@ static inline int mmu_notifier_retry(struct kvm *kvm,
unsigned long mmu_seq)
return 1;
return 0;
}
-#endif
+
+#ifdef _ASM_X86_KVM_HOST_H
+void kvm_arch_mmu_notifier_invalidate_page(struct kvm *kvm,
+ unsigned long address);
+#else /* _ASM_X86_KVM_HOST_H */
+inline void kvm_arch_mmu_notifier_invalidate_page(struct kvm *kvm,
+ unsigned long address)
+{
+ return;
+}
+#endif /* _ASM_X86_KVM_HOST_H */
+
+#endif /* CONFIG_MMU_NOTIFIER & KVM_ARCH_WANT_MMU_NOTIFIER */
#ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
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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