diff options
| author | Avi Kivity <avi@qumranet.com> | 2007-08-15 14:23:34 +0200 |
|---|---|---|
| committer | Avi Kivity <avi@qumranet.com> | 2007-10-13 10:18:23 +0200 |
| commit | 7e66f350cfc853043bfa71b281581dd6f92fa347 (patch) | |
| tree | bbf821c3fd4578cfacb07deaa59f18da5eaa4411 /drivers/kvm/vmx.c | |
| parent | KVM: Clean up kvm_setup_pio() (diff) | |
| download | linux-7e66f350cfc853043bfa71b281581dd6f92fa347.tar.xz linux-7e66f350cfc853043bfa71b281581dd6f92fa347.zip | |
KVM: Close minor race in signal handling
We need to check for signals inside the critical section, otherwise a
signal can be sent which we will not notice. Also move the check
before entry, so that if the signal happens before the first entry,
we exit immediately instead of waiting for something to happen to the
guest.
Signed-off-by: Avi Kivity <avi@qumranet.com>
Diffstat (limited to 'drivers/kvm/vmx.c')
| -rw-r--r-- | drivers/kvm/vmx.c | 23 |
1 files changed, 12 insertions, 11 deletions
diff --git a/drivers/kvm/vmx.c b/drivers/kvm/vmx.c index 906d4fa13d10..a9b4cb51dec8 100644 --- a/drivers/kvm/vmx.c +++ b/drivers/kvm/vmx.c @@ -2066,9 +2066,6 @@ again: preempt_disable(); - if (!vcpu->mmio_read_completed) - do_interrupt_requests(vcpu, kvm_run); - vmx_save_host_state(vmx); kvm_load_guest_fpu(vcpu); @@ -2079,6 +2076,18 @@ again: local_irq_disable(); + if (signal_pending(current)) { + local_irq_enable(); + preempt_enable(); + r = -EINTR; + kvm_run->exit_reason = KVM_EXIT_INTR; + ++vcpu->stat.signal_exits; + goto out; + } + + if (!vcpu->mmio_read_completed) + do_interrupt_requests(vcpu, kvm_run); + vcpu->guest_mode = 1; if (vcpu->requests) if (test_and_clear_bit(KVM_TLB_FLUSH, &vcpu->requests)) @@ -2227,14 +2236,6 @@ again: r = kvm_handle_exit(kvm_run, vcpu); if (r > 0) { - /* Give scheduler a change to reschedule. */ - if (signal_pending(current)) { - r = -EINTR; - kvm_run->exit_reason = KVM_EXIT_INTR; - ++vcpu->stat.signal_exits; - goto out; - } - if (dm_request_for_irq_injection(vcpu, kvm_run)) { r = -EINTR; kvm_run->exit_reason = KVM_EXIT_INTR; |