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kvm: Fix IRQ injection into full queue

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User space may only inject interrupts during kvm_arch_pre_run if
ready_for_interrupt_injection is set in kvm_run. But that field is
updated on exit from KVM_RUN, so we must ensure that we enter the
kernel after potentially queuing an interrupt, otherwise we risk to
loose one - like it happens with the current code against latest
kernel modules (since kvm-86) that started to queue only a single
interrupt.

Fix the problem by reordering kvm_cpu_exec.

Credits go to Gleb Natapov for analyzing the issue in details.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Jan Kiszka 2009-05-30 10:01:45 +02:00 • committed by Anthony Liguori
parent 6a7ad2998c
commit 8c14c17395
1 changed files with 1 additions and 2 deletions
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3
kvm-all.c
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@ -578,14 +578,13 @@ int kvm_cpu_exec(CPUState *env)
dprintf("kvm_cpu_exec()\n"); dprintf("kvm_cpu_exec()\n");
do { do {
kvm_arch_pre_run(env, run);
if (env->exit_request) { if (env->exit_request) {
dprintf("interrupt exit requested\n"); dprintf("interrupt exit requested\n");
ret = 0; ret = 0;
break; break;
} }
kvm_arch_pre_run(env, run);
ret = kvm_vcpu_ioctl(env, KVM_RUN, 0); ret = kvm_vcpu_ioctl(env, KVM_RUN, 0);
kvm_arch_post_run(env, run); kvm_arch_post_run(env, run);