i386/xen: Implement SCHEDOP_poll and SCHEDOP_yield
They both do the same thing and just call sched_yield. This is 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 <dwmw@amazon.co.uk> Reviewed-by: Paul Durrant <paul@xen.org>
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@ -234,6 +234,19 @@ static bool kvm_xen_hcall_sched_op(struct kvm_xen_exit *exit, X86CPU *cpu,
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err = schedop_shutdown(cs, arg);
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break;
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case SCHEDOP_poll:
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/*
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* Linux will panic if this doesn't work. Just yield; it's not
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* worth overthinking it because with event channel handling
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* in KVM, the kernel will intercept this and it will never
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* reach QEMU anyway. The semantics of the hypercall explicltly
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* permit spurious wakeups.
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*/
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case SCHEDOP_yield:
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sched_yield();
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err = 0;
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break;
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default:
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return false;
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}
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