KVM: ia64: Add handler for crashed vmm

Since vmm runs in an isolated address space and it is just a copy
of host's kvm-intel module, so once vmm crashes, we just crash all guests
running on it instead of crashing whole kernel.
Signed-off-by: NXiantao Zhang <xiantao.zhang@intel.com>
Signed-off-by: NAvi Kivity <avi@redhat.com>

arch/ia64/kvm/process.c

@@ -942,8 +942,20 @@ static void vcpu_do_resume(struct kvm_vcpu *vcpu)
 	ia64_set_pta(vcpu->arch.vhpt.pta.val);
 }
 
+static void vmm_sanity_check(struct kvm_vcpu *vcpu)
+{
+	struct exit_ctl_data *p = &vcpu->arch.exit_data;
+
+	if (!vmm_sanity && p->exit_reason != EXIT_REASON_DEBUG) {
+		panic_vm(vcpu, "Failed to do vmm sanity check,"
+			"it maybe caused by crashed vmm!!\n\n");
+	}
+}
+
 static void kvm_do_resume_op(struct kvm_vcpu *vcpu)
 {
+	vmm_sanity_check(vcpu); /*Guarantee vcpu runing on healthy vmm!*/
+
 	if (test_and_clear_bit(KVM_REQ_RESUME, &vcpu->requests)) {
 		vcpu_do_resume(vcpu);
 		return;
@@ -969,3 +981,11 @@ void vmm_transition(struct kvm_vcpu *vcpu)
 						1, 0, 0, 0, 0, 0);
 	kvm_do_resume_op(vcpu);
 }
+
+void vmm_panic_handler(u64 vec)
+{
+	struct kvm_vcpu *vcpu = current_vcpu;
+	vmm_sanity = 0;
+	panic_vm(vcpu, "Unexpected interruption occurs in VMM, vector:0x%lx\n",
+			vec2off[vec]);
+}

arch/ia64/kvm/vcpu.h

@@ -741,5 +741,8 @@ void panic_vm(struct kvm_vcpu *v, const char *fmt, ...);
 
 extern u64 ia64_call_vsa(u64 proc, u64 arg1, u64 arg2, u64 arg3,
 		u64 arg4, u64 arg5, u64 arg6, u64 arg7);
+
+extern long vmm_sanity;
+
 #endif
 #endif	/* __VCPU_H__ */

arch/ia64/kvm/vmm.c

@@ -32,6 +32,8 @@ MODULE_LICENSE("GPL");
 extern char kvm_ia64_ivt;
 extern fpswa_interface_t *vmm_fpswa_interface;
 
+long vmm_sanity = 1;
+
 struct kvm_vmm_info vmm_info = {
 	.module	     = THIS_MODULE,
 	.vmm_entry   = vmm_entry,

arch/ia64/kvm/vmm_ivt.S

@@ -70,14 +70,12 @@
 # define PSR_DEFAULT_BITS   0
 #endif
 
-
 #define KVM_FAULT(n)    \
     kvm_fault_##n:;          \
     mov r19=n;;          \
-    br.sptk.many kvm_fault_##n;         \
+    br.sptk.many kvm_vmm_panic;         \
     ;;                  \
 
-
 #define KVM_REFLECT(n)    \
     mov r31=pr;           \
     mov r19=n;       /* prepare to save predicates */ \
@@ -85,17 +83,26 @@
     ;;      \
     tbit.z p6,p7=r29,IA64_PSR_VM_BIT;       \
 (p7)br.sptk.many kvm_dispatch_reflection;        \
-    br.sptk.many kvm_panic;      \
-
+    br.sptk.many kvm_vmm_panic;      \
 
-GLOBAL_ENTRY(kvm_panic)
-    br.sptk.many kvm_panic
+GLOBAL_ENTRY(kvm_vmm_panic)
+    KVM_SAVE_MIN_WITH_COVER_R19
+    alloc r14=ar.pfs,0,0,1,0
+    mov out0=r15
+    adds r3=8,r2                // set up second base pointer
     ;;
-END(kvm_panic)
-
-
-
-
+    ssm psr.ic
+    ;;
+    srlz.i                  // guarantee that interruption collection is on
+    ;;
+    //(p15) ssm psr.i               // restore psr.i
+    addl r14=@gprel(ia64_leave_hypervisor),gp
+    ;;
+    KVM_SAVE_REST
+    mov rp=r14
+    ;;
+    br.call.sptk.many b6=vmm_panic_handler;
+END(kvm_vmm_panic)
 
     .section .text.ivt,"ax"