[COMMIT master] KVM: fix cleanup_srcu_struct on vm destruction

[Avi Kivity]

From: Marcelo Tosatti <mtosa...@redhat.com>

cleanup_srcu_struct on VM destruction remains broken:

BUG: unable to handle kernel paging request at ffffffffffffffff
IP: [<ffffffff802533d2>] srcu_read_lock+0x16/0x21
RIP: 0010:[<ffffffff802533d2>]  [<ffffffff802533d2>] srcu_read_lock+0x16/0x21
Call Trace:
 [<ffffffffa05354c4>] kvm_arch_vcpu_uninit+0x1b/0x48 [kvm]
 [<ffffffffa05339c6>] kvm_vcpu_uninit+0x9/0x15 [kvm]
 [<ffffffffa0569f7d>] vmx_free_vcpu+0x7f/0x8f [kvm_intel]
 [<ffffffffa05357b5>] kvm_arch_destroy_vm+0x78/0x111 [kvm]
 [<ffffffffa053315b>] kvm_put_kvm+0xd4/0xfe [kvm]

Move it to kvm_arch_destroy_vm.

Signed-off-by: Marcelo Tosatti <mtosa...@redhat.com>
Reported-by: Jan Kiszka <jan.kis...@siemens.com>

diff --git a/arch/ia64/kvm/kvm-ia64.c b/arch/ia64/kvm/kvm-ia64.c
index e6ac549..0618898 100644
--- a/arch/ia64/kvm/kvm-ia64.c
+++ b/arch/ia64/kvm/kvm-ia64.c
@@ -1404,6 +1404,7 @@ void kvm_arch_destroy_vm(struct kvm *kvm)
        kfree(kvm->arch.vioapic);
        kvm_release_vm_pages(kvm);
        kvm_free_physmem(kvm);
+       cleanup_srcu_struct(&kvm->srcu);
        free_kvm(kvm);
 }
 
diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index 2c29116..51aedd7 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -137,6 +137,7 @@ void kvm_arch_destroy_vm(struct kvm *kvm)
 {
        kvmppc_free_vcpus(kvm);
        kvm_free_physmem(kvm);
+       cleanup_srcu_struct(&kvm->srcu);
        kfree(kvm);
 }
 
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 8bedd31..8f09959 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -241,6 +241,7 @@ void kvm_arch_destroy_vm(struct kvm *kvm)
        kvm_free_physmem(kvm);
        free_page((unsigned long)(kvm->arch.sca));
        debug_unregister(kvm->arch.dbf);
+       cleanup_srcu_struct(&kvm->srcu);
        kfree(kvm);
 }
 
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index a311751..56a90a6 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -5546,6 +5546,7 @@ void kvm_arch_destroy_vm(struct kvm *kvm)
                put_page(kvm->arch.apic_access_page);
        if (kvm->arch.ept_identity_pagetable)
                put_page(kvm->arch.ept_identity_pagetable);
+       cleanup_srcu_struct(&kvm->srcu);
        kfree(kvm->arch.aliases);
        kfree(kvm);
 }
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 2b7cd6c..7c5c873 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -506,7 +506,6 @@ static void kvm_destroy_vm(struct kvm *kvm)
 #else
        kvm_arch_flush_shadow(kvm);
 #endif
-       cleanup_srcu_struct(&kvm->srcu);
        kvm_arch_destroy_vm(kvm);
        hardware_disable_all();
        mmdrop(mm);
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