diff options
| author | Avi Kivity <avi@qumranet.com> | 2007-08-15 15:23:34 +0300 |
|---|---|---|
| committer | Avi Kivity <avi@qumranet.com> | 2007-10-13 10:18:23 +0200 |
| commit | 7e66f350cfc853043bfa71b281581dd6f92fa347 (patch) | |
| tree | bbf821c3fd4578cfacb07deaa59f18da5eaa4411 /drivers/kvm/svm.c | |
| parent | 3090dd7377c7eb5cbe229e2a538f9dc7e5b06814 (diff) | |
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/svm.c')
| -rw-r--r-- | drivers/kvm/svm.c | 19 |
1 files changed, 10 insertions, 9 deletions
diff --git a/drivers/kvm/svm.c b/drivers/kvm/svm.c index e3c6d891326..cc674bfd31d 100644 --- a/drivers/kvm/svm.c +++ b/drivers/kvm/svm.c @@ -1398,11 +1398,19 @@ again: if (unlikely(r)) return r; + clgi(); + + if (signal_pending(current)) { + stgi(); + ++vcpu->stat.signal_exits; + post_kvm_run_save(svm, kvm_run); + kvm_run->exit_reason = KVM_EXIT_INTR; + return -EINTR; + } + if (!vcpu->mmio_read_completed) do_interrupt_requests(svm, kvm_run); - clgi(); - vcpu->guest_mode = 1; if (vcpu->requests) if (test_and_clear_bit(KVM_TLB_FLUSH, &vcpu->requests)) @@ -1582,13 +1590,6 @@ again: r = handle_exit(svm, kvm_run); if (r > 0) { - if (signal_pending(current)) { - ++vcpu->stat.signal_exits; - post_kvm_run_save(svm, kvm_run); - kvm_run->exit_reason = KVM_EXIT_INTR; - return -EINTR; - } - if (dm_request_for_irq_injection(svm, kvm_run)) { ++vcpu->stat.request_irq_exits; post_kvm_run_save(svm, kvm_run); |