From b8405c184b4ef3abcebc5cf2211215944d6e2acc Mon Sep 17 00:00:00 2001
From: Avi Kivity <avi@redhat.com>
Date: Thu, 7 Jun 2012 17:08:48 +0300
Subject: KVM: VMX: Limit iterations with emulator_invalid_guest_state

Otherwise, if the guest ends up looping, we never exit the srcu critical
section, which causes synchronize_srcu() to hang.

Signed-off-by: Avi Kivity <avi@redhat.com>

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 82ab1fb..debac49 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -4977,11 +4977,12 @@ static int handle_invalid_guest_state(struct kvm_vcpu *vcpu)
 	int ret = 1;
 	u32 cpu_exec_ctrl;
 	bool intr_window_requested;
+	unsigned count = 130;
 
 	cpu_exec_ctrl = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
 	intr_window_requested = cpu_exec_ctrl & CPU_BASED_VIRTUAL_INTR_PENDING;
 
-	while (!guest_state_valid(vcpu)) {
+	while (!guest_state_valid(vcpu) && count-- != 0) {
 		if (intr_window_requested
 		    && (kvm_get_rflags(&vmx->vcpu) & X86_EFLAGS_IF))
 			return handle_interrupt_window(&vmx->vcpu);
-- 
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