a72ccc7fc4
The primary console is special because the toolstack maps a page into the guest for its ring, and also allocates the guest-side event channel. The guest's grant table is even primed to export that page using a known grant ref#. Add support for all that in emulated mode, so that we can have a primary console. For reasons unclear, the backends running under real Xen don't just use a mapping of the well-known GNTTAB_RESERVED_CONSOLE grant ref (which would also be in the ring-ref node in XenStore). Instead, the toolstack sets the ring-ref node of the primary console to the GFN of the guest page. The backend is expected to handle that special case and map it with foreignmem operations instead. We don't have an implementation of foreignmem ops for emulated Xen mode, so just make it map GNTTAB_RESERVED_CONSOLE instead. This would probably work for real Xen too, but we can't work out how to make real Xen create a primary console of type "ioemu" to make QEMU drive it, so we can't test that; might as well leave it as it is for now under Xen. Now at last we can boot the Xen PV shim and run PV kernels in QEMU. Signed-off-by: David Woodhouse <dwmw@amazon.co.uk> Reviewed-by: Paul Durrant <paul@xen.org>
53 lines
1.1 KiB
C
53 lines
1.1 KiB
C
/*
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* QEMU Xen emulation: QMP stubs
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*
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* Copyright © 2023 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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*
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* Authors: David Woodhouse <dwmw2@infradead.org>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#include "qemu/osdep.h"
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#include "qapi/error.h"
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#include "qapi/qapi-commands-misc-target.h"
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#include "xen_evtchn.h"
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#include "xen_primary_console.h"
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void xen_evtchn_snoop_msi(PCIDevice *dev, bool is_msix, unsigned int vector,
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uint64_t addr, uint32_t data, bool is_masked)
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{
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}
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void xen_evtchn_remove_pci_device(PCIDevice *dev)
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{
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}
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bool xen_evtchn_deliver_pirq_msi(uint64_t address, uint32_t data)
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{
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return false;
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}
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void xen_primary_console_create(void)
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{
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}
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void xen_primary_console_set_be_port(uint16_t port)
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{
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}
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#ifdef TARGET_I386
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EvtchnInfoList *qmp_xen_event_list(Error **errp)
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{
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error_setg(errp, "Xen event channel emulation not enabled");
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return NULL;
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}
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void qmp_xen_event_inject(uint32_t port, Error **errp)
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{
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error_setg(errp, "Xen event channel emulation not enabled");
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}
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#endif
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