KVM: x86: Fix handling of pending signal on uninitialized AP

KVM API says that KVM_RUN will return with -EINTR when a signal is
pending. However, if a vCPU is in KVM_MP_STATE_UNINITIALIZED, then
the return value is unconditionally -EAGAIN.

Copy over some code from vcpu_run(), so that the case of a pending
signal results in the expected return value.

Signed-off-by: Jan H. Schönherr <jschoenh@amazon.de>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 6069af86da3b..b27f7f0020e3 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -7235,6 +7235,11 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
                 kvm_apic_accept_events(vcpu);
                 kvm_clear_request(KVM_REQ_UNHALT, vcpu);
                 r = -EAGAIN;
+                if (signal_pending(current)) {
+                        r = -EINTR;
+                        vcpu->run->exit_reason = KVM_EXIT_INTR;
+                        ++vcpu->stat.signal_exits;
+                }
                 goto out;
         }