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hw/xen: Add evtchn operations to allow redirection to internal emulation

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The existing implementation calling into the real libxenevtchn moves to
a new file hw/xen/xen-operations.c, and is called via a function table
which in a subsequent commit will also be able to invoke the emulated
event channel support.

Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Reviewed-by: Paul Durrant <paul@xen.org>
This commit is contained in:
David Woodhouse 2023-01-01 17:54:41 +00:00
parent 831b0db8ab
commit b6cacfea0b
13 changed files with 242 additions and 57 deletions
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71
hw/xen/xen-operations.c Normal file
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/*
* QEMU Xen backend support: Operations for true Xen
*
* Copyright © 2022 Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Authors: David Woodhouse <dwmw2@infradead.org>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#include "qemu/osdep.h"
#include "qapi/error.h"
#include "hw/xen/xen_backend_ops.h"
#include "hw/xen/xen_common.h"
/*
* If we have new enough libxenctrl then we do not want/need these compat
* interfaces, despite what the user supplied cflags might say. They
* must be undefined before including xenctrl.h
*/
#undef XC_WANT_COMPAT_EVTCHN_API
#include <xenctrl.h>
/*
* We don't support Xen prior to 4.2.0.
*/
/* Xen 4.2 through 4.6 */
#if CONFIG_XEN_CTRL_INTERFACE_VERSION < 40701
typedef xc_evtchn xenevtchn_handle;
typedef evtchn_port_or_error_t xenevtchn_port_or_error_t;
#define xenevtchn_open(l, f) xc_evtchn_open(l, f);
#define xenevtchn_close(h) xc_evtchn_close(h)
#define xenevtchn_fd(h) xc_evtchn_fd(h)
#define xenevtchn_pending(h) xc_evtchn_pending(h)
#define xenevtchn_notify(h, p) xc_evtchn_notify(h, p)
#define xenevtchn_bind_interdomain(h, d, p) xc_evtchn_bind_interdomain(h, d, p)
#define xenevtchn_unmask(h, p) xc_evtchn_unmask(h, p)
#define xenevtchn_unbind(h, p) xc_evtchn_unbind(h, p)
#else /* CONFIG_XEN_CTRL_INTERFACE_VERSION >= 40701 */
#include <xenevtchn.h>
#endif
static xenevtchn_handle *libxenevtchn_backend_open(void)
{
return xenevtchn_open(NULL, 0);
}
struct evtchn_backend_ops libxenevtchn_backend_ops = {
.open = libxenevtchn_backend_open,
.close = xenevtchn_close,
.bind_interdomain = xenevtchn_bind_interdomain,
.unbind = xenevtchn_unbind,
.get_fd = xenevtchn_fd,
.notify = xenevtchn_notify,
.unmask = xenevtchn_unmask,
.pending = xenevtchn_pending,
};
void setup_xen_backend_ops(void)
{
xen_evtchn_ops = &libxenevtchn_backend_ops;
}