From: David Woodhouse <d...@amazon.co.uk>
Just a dummy implementation which will sched_yield(), but it's enough to
stop the Linux guest panicking when running on a host kernel which doesn't
intercept SCHEDOP_poll and lets it reach userspace.
Signed-off-by: David Woodhouse <d...@amazon.co.uk>
---
target/i386/kvm/xen-emu.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/target/i386/kvm/xen-emu.c b/target/i386/kvm/xen-emu.c
index 055afba627..a8c953e3ca 100644
--- a/target/i386/kvm/xen-emu.c
+++ b/target/i386/kvm/xen-emu.c
@@ -919,6 +919,17 @@ static bool kvm_xen_hcall_sched_op(struct kvm_xen_exit
*exit, X86CPU *cpu,
err = schedop_shutdown(cs, arg);
break;
+ case SCHEDOP_poll:
+ /*
+ * Linux will panic if this doesn't work. Just yield; it's not
+ * worth overthinking it because wWith event channel handling
+ * in KVM, the kernel will intercept this and it will never
+ * reach QEMU anyway.
+ */
+ sched_yield();
+ err = 0;
+ break;
+
default:
return false;
}
--
2.35.3
