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KVM: VMX: Limit iterations with emulator_invalid_guest_state

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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>
This commit is contained in:
Avi Kivity 2012-06-07 17:08:48 +03:00
parent f0495f9b99
commit b8405c184b
1 changed files with 2 additions and 1 deletions
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3
arch/x86/kvm/vmx.c
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@ -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);