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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
#undef XC_WANT_COMPAT_GNTTAB_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)
typedef xc_gnttab xengnttab_handle;
#define xengnttab_open(l, f) xc_gnttab_open(l, f)
#define xengnttab_close(h) xc_gnttab_close(h)
#define xengnttab_set_max_grants(h, n) xc_gnttab_set_max_grants(h, n)
#define xengnttab_map_grant_ref(h, d, r, p) xc_gnttab_map_grant_ref(h, d, r, p)
#define xengnttab_unmap(h, a, n) xc_gnttab_munmap(h, a, n)
#define xengnttab_map_grant_refs(h, c, d, r, p) \
xc_gnttab_map_grant_refs(h, c, d, r, p)
#define xengnttab_map_domain_grant_refs(h, c, d, r, p) \
xc_gnttab_map_domain_grant_refs(h, c, d, r, p)
#else /* CONFIG_XEN_CTRL_INTERFACE_VERSION >= 40701 */
#include <xenevtchn.h>
#include <xengnttab.h>
#endif
/* Xen before 4.8 */
static int libxengnttab_fallback_grant_copy(xengnttab_handle *xgt,
bool to_domain, uint32_t domid,
XenGrantCopySegment segs[],
unsigned int nr_segs, Error **errp)
{
uint32_t *refs = g_new(uint32_t, nr_segs);
int prot = to_domain ? PROT_WRITE : PROT_READ;
void *map;
unsigned int i;
int rc = 0;
for (i = 0; i < nr_segs; i++) {
XenGrantCopySegment *seg = &segs[i];
refs[i] = to_domain ? seg->dest.foreign.ref :
seg->source.foreign.ref;
}
map = xengnttab_map_domain_grant_refs(xgt, nr_segs, domid, refs, prot);
if (!map) {
if (errp) {
error_setg_errno(errp, errno,
"xengnttab_map_domain_grant_refs failed");
}
rc = -errno;
goto done;
}
for (i = 0; i < nr_segs; i++) {
XenGrantCopySegment *seg = &segs[i];
void *page = map + (i * XEN_PAGE_SIZE);
if (to_domain) {
memcpy(page + seg->dest.foreign.offset, seg->source.virt,
seg->len);
} else {
memcpy(seg->dest.virt, page + seg->source.foreign.offset,
seg->len);
}
}
if (xengnttab_unmap(xgt, map, nr_segs)) {
if (errp) {
error_setg_errno(errp, errno, "xengnttab_unmap failed");
}
rc = -errno;
}
done:
g_free(refs);
return rc;
}
#if CONFIG_XEN_CTRL_INTERFACE_VERSION >= 40800
static int libxengnttab_backend_grant_copy(xengnttab_handle *xgt,
bool to_domain, uint32_t domid,
XenGrantCopySegment *segs,
uint32_t nr_segs, Error **errp)
{
xengnttab_grant_copy_segment_t *xengnttab_segs;
unsigned int i;
int rc;
xengnttab_segs = g_new0(xengnttab_grant_copy_segment_t, nr_segs);
for (i = 0; i < nr_segs; i++) {
XenGrantCopySegment *seg = &segs[i];
xengnttab_grant_copy_segment_t *xengnttab_seg = &xengnttab_segs[i];
if (to_domain) {
xengnttab_seg->flags = GNTCOPY_dest_gref;
xengnttab_seg->dest.foreign.domid = domid;
xengnttab_seg->dest.foreign.ref = seg->dest.foreign.ref;
xengnttab_seg->dest.foreign.offset = seg->dest.foreign.offset;
xengnttab_seg->source.virt = seg->source.virt;
} else {
xengnttab_seg->flags = GNTCOPY_source_gref;
xengnttab_seg->source.foreign.domid = domid;
xengnttab_seg->source.foreign.ref = seg->source.foreign.ref;
xengnttab_seg->source.foreign.offset =
seg->source.foreign.offset;
xengnttab_seg->dest.virt = seg->dest.virt;
}
xengnttab_seg->len = seg->len;
}
if (xengnttab_grant_copy(xgt, nr_segs, xengnttab_segs)) {
if (errp) {
error_setg_errno(errp, errno, "xengnttab_grant_copy failed");
}
rc = -errno;
goto done;
}
rc = 0;
for (i = 0; i < nr_segs; i++) {
xengnttab_grant_copy_segment_t *xengnttab_seg = &xengnttab_segs[i];
if (xengnttab_seg->status != GNTST_okay) {
if (errp) {
error_setg(errp, "xengnttab_grant_copy seg[%u] failed", i);
}
rc = -EIO;
break;
}
}
done:
g_free(xengnttab_segs);
return rc;
}
#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,
};
static xengnttab_handle *libxengnttab_backend_open(void)
{
return xengnttab_open(NULL, 0);
}
static int libxengnttab_backend_unmap(xengnttab_handle *xgt,
void *start_address, uint32_t *refs,
uint32_t count)
{
return xengnttab_unmap(xgt, start_address, count);
}
static struct gnttab_backend_ops libxengnttab_backend_ops = {
.features = XEN_GNTTAB_OP_FEATURE_MAP_MULTIPLE,
.open = libxengnttab_backend_open,
.close = xengnttab_close,
.grant_copy = libxengnttab_fallback_grant_copy,
.set_max_grants = xengnttab_set_max_grants,
.map_refs = xengnttab_map_domain_grant_refs,
.unmap = libxengnttab_backend_unmap,
};
void setup_xen_backend_ops(void)
{
#if CONFIG_XEN_CTRL_INTERFACE_VERSION >= 40800
xengnttab_handle *xgt = xengnttab_open(NULL, 0);
if (xgt) {
if (xengnttab_grant_copy(xgt, 0, NULL) == 0) {
libxengnttab_backend_ops.grant_copy = libxengnttab_backend_grant_copy;
}
xengnttab_close(xgt);
}
#endif
xen_evtchn_ops = &libxenevtchn_backend_ops;
xen_gnttab_ops = &libxengnttab_backend_ops;
}
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