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KVM: x86: Fix immediate_exit handling for uninitialized AP

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When user space sets kvm_run->immediate_exit, KVM is supposed to
return quickly. However, when a vCPU is in KVM_MP_STATE_UNINITIALIZED,
the value is not considered and the vCPU blocks.

Fix that oversight.

Fixes: 460df4c1fc ("KVM: race-free exit from KVM_RUN without POSIX signals")
Signed-off-by: Jan H. Schönherr <jschoenh@amazon.de>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
This commit is contained in:
Jan H. Schönherr 2017-09-06 18:34:06 +02:00 committed by Radim Krčmář
parent a05950009f
commit 2f173d2688
1 changed files with 4 additions and 0 deletions
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4
arch/x86/kvm/x86.c
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@ -7231,6 +7231,10 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved); sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
if (unlikely(vcpu->arch.mp_state == KVM_MP_STATE_UNINITIALIZED)) { if (unlikely(vcpu->arch.mp_state == KVM_MP_STATE_UNINITIALIZED)) {
if (kvm_run->immediate_exit) {
r = -EINTR;
goto out;
}
kvm_vcpu_block(vcpu); kvm_vcpu_block(vcpu);
kvm_apic_accept_events(vcpu); kvm_apic_accept_events(vcpu);
kvm_clear_request(KVM_REQ_UNHALT, vcpu); kvm_clear_request(KVM_REQ_UNHALT, vcpu);