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[RFC PATCH v3 36/38] i386/xen: Implement SCHEDOP_poll
From: |
David Woodhouse |
Subject: |
[RFC PATCH v3 36/38] i386/xen: Implement SCHEDOP_poll |
Date: |
Fri, 16 Dec 2022 00:41:15 +0000 |
From: David Woodhouse <dwmw@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 <dwmw@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
- [RFC PATCH v3 29/38] hw/xen: Implement EVTCHNOP_bind_ipi, (continued)
- [RFC PATCH v3 29/38] hw/xen: Implement EVTCHNOP_bind_ipi, David Woodhouse, 2022/12/15
- [RFC PATCH v3 02/38] xen: add CONFIG_XENFV_MACHINE and CONFIG_XEN_EMU options for Xen emulation, David Woodhouse, 2022/12/15
- [RFC PATCH v3 32/38] hw/xen: Implement EVTCHNOP_bind_interdomain, David Woodhouse, 2022/12/15
- [RFC PATCH v3 25/38] hw/xen: Implement EVTCHNOP_status, David Woodhouse, 2022/12/15
- [RFC PATCH v3 08/38] hw/xen_backend: refactor xen_be_init(), David Woodhouse, 2022/12/15
- [RFC PATCH v3 15/38] i386/xen: implement XENMEM_add_to_physmap_batch, David Woodhouse, 2022/12/15
- [RFC PATCH v3 23/38] i386/xen: implement HYPERVISOR_event_channel_op, David Woodhouse, 2022/12/15
- [RFC PATCH v3 31/38] hw/xen: Implement EVTCHNOP_alloc_unbound, David Woodhouse, 2022/12/15
- [RFC PATCH v3 36/38] i386/xen: Implement SCHEDOP_poll,
David Woodhouse <=
- [RFC PATCH v3 11/38] hw/xen: Add xen_overlay device for emulating shared xenheap pages, David Woodhouse, 2022/12/15
- [RFC PATCH v3 19/38] i386/xen: handle VCPUOP_register_vcpu_time_info, David Woodhouse, 2022/12/15
- [RFC PATCH v3 28/38] hw/xen: Implement EVTCHNOP_bind_virq, David Woodhouse, 2022/12/15
- [RFC PATCH v3 21/38] i386/xen: implement HVMOP_set_evtchn_upcall_vector, David Woodhouse, 2022/12/15
- [RFC PATCH v3 33/38] hw/xen: Implement EVTCHNOP_bind_vcpu, David Woodhouse, 2022/12/15
- [RFC PATCH v3 04/38] i386/kvm: Add xen-version machine property and init KVM Xen support, David Woodhouse, 2022/12/15
- [RFC PATCH v3 14/38] i386/xen: implement HYPERVISOR_memory_op, David Woodhouse, 2022/12/15
- [RFC PATCH v3 09/38] i386/xen: handle guest hypercalls, David Woodhouse, 2022/12/15
- [RFC PATCH v3 30/38] hw/xen: Implement EVTCHNOP_send, David Woodhouse, 2022/12/15