Xen PCI passthrough support may not be available and thus the global
variable "has_igd_gfx_passthru" might be compiled out. Common code
should not access it in that case.
Unfortunately, we can't use CONFIG_XEN_PCI_PASSTHROUGH directly in
xen-common.c so this patch instead move access to the
has_igd_gfx_passthru variable via function and those functions are
also implemented as stubs. The stubs will be used when QEMU is built
without passthrough support.
Now, when one will want to enable igd-passthru via the -machine
property, they will get an error message if QEMU is built without
passthrough support.
Fixes: 46472d8232
('xen: convert "-machine igd-passthru" to an accelerator property')
Reported-by: Roger Pau Monné <roger.pau@citrix.com>
Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
Message-Id: <20200603160442.3151170-1-anthony.perard@citrix.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
228 lines
5.6 KiB
C
228 lines
5.6 KiB
C
/*
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* Copyright (C) 2014 Citrix Systems UK Ltd.
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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* Contributions after 2012-01-13 are licensed under the terms of the
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* GNU GPL, version 2 or (at your option) any later version.
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*/
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#include "qemu/osdep.h"
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#include "qemu/error-report.h"
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#include "qemu/module.h"
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#include "qapi/error.h"
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#include "hw/xen/xen-legacy-backend.h"
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#include "hw/xen/xen_pt.h"
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#include "chardev/char.h"
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#include "sysemu/accel.h"
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#include "sysemu/xen.h"
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#include "sysemu/runstate.h"
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#include "migration/misc.h"
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#include "migration/global_state.h"
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#include "hw/boards.h"
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//#define DEBUG_XEN
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#ifdef DEBUG_XEN
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#define DPRINTF(fmt, ...) \
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do { fprintf(stderr, "xen: " fmt, ## __VA_ARGS__); } while (0)
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#else
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#define DPRINTF(fmt, ...) \
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do { } while (0)
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#endif
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static bool xen_allowed;
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bool xen_enabled(void)
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{
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return xen_allowed;
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}
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xc_interface *xen_xc;
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xenforeignmemory_handle *xen_fmem;
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xendevicemodel_handle *xen_dmod;
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static int store_dev_info(int domid, Chardev *cs, const char *string)
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{
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struct xs_handle *xs = NULL;
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char *path = NULL;
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char *newpath = NULL;
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char *pts = NULL;
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int ret = -1;
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/* Only continue if we're talking to a pty. */
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if (!CHARDEV_IS_PTY(cs)) {
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return 0;
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}
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pts = cs->filename + 4;
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/* We now have everything we need to set the xenstore entry. */
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xs = xs_open(0);
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if (xs == NULL) {
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fprintf(stderr, "Could not contact XenStore\n");
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goto out;
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}
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path = xs_get_domain_path(xs, domid);
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if (path == NULL) {
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fprintf(stderr, "xs_get_domain_path() error\n");
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goto out;
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}
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newpath = realloc(path, (strlen(path) + strlen(string) +
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strlen("/tty") + 1));
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if (newpath == NULL) {
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fprintf(stderr, "realloc error\n");
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goto out;
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}
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path = newpath;
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strcat(path, string);
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strcat(path, "/tty");
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if (!xs_write(xs, XBT_NULL, path, pts, strlen(pts))) {
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fprintf(stderr, "xs_write for '%s' fail", string);
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goto out;
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}
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ret = 0;
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out:
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free(path);
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xs_close(xs);
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return ret;
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}
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void xenstore_store_pv_console_info(int i, Chardev *chr)
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{
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if (i == 0) {
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store_dev_info(xen_domid, chr, "/console");
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} else {
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char buf[32];
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snprintf(buf, sizeof(buf), "/device/console/%d", i);
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store_dev_info(xen_domid, chr, buf);
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}
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}
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static void xenstore_record_dm_state(struct xs_handle *xs, const char *state)
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{
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char path[50];
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if (xs == NULL) {
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error_report("xenstore connection not initialized");
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exit(1);
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}
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snprintf(path, sizeof (path), "device-model/%u/state", xen_domid);
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/*
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* This call may fail when running restricted so don't make it fatal in
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* that case. Toolstacks should instead use QMP to listen for state changes.
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*/
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if (!xs_write(xs, XBT_NULL, path, state, strlen(state)) &&
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!xen_domid_restrict) {
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error_report("error recording dm state");
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exit(1);
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}
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}
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static void xen_change_state_handler(void *opaque, int running,
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RunState state)
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{
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if (running) {
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/* record state running */
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xenstore_record_dm_state(xenstore, "running");
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}
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}
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static bool xen_get_igd_gfx_passthru(Object *obj, Error **errp)
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{
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return xen_igd_gfx_pt_enabled();
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}
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static void xen_set_igd_gfx_passthru(Object *obj, bool value, Error **errp)
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{
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xen_igd_gfx_pt_set(value, errp);
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}
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static void xen_setup_post(MachineState *ms, AccelState *accel)
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{
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int rc;
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if (xen_domid_restrict) {
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rc = xen_restrict(xen_domid);
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if (rc < 0) {
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perror("xen: failed to restrict");
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exit(1);
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}
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}
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}
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static int xen_init(MachineState *ms)
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{
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MachineClass *mc = MACHINE_GET_CLASS(ms);
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xen_xc = xc_interface_open(0, 0, 0);
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if (xen_xc == NULL) {
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xen_pv_printf(NULL, 0, "can't open xen interface\n");
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return -1;
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}
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xen_fmem = xenforeignmemory_open(0, 0);
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if (xen_fmem == NULL) {
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xen_pv_printf(NULL, 0, "can't open xen fmem interface\n");
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xc_interface_close(xen_xc);
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return -1;
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}
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xen_dmod = xendevicemodel_open(0, 0);
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if (xen_dmod == NULL) {
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xen_pv_printf(NULL, 0, "can't open xen devicemodel interface\n");
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xenforeignmemory_close(xen_fmem);
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xc_interface_close(xen_xc);
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return -1;
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}
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qemu_add_vm_change_state_handler(xen_change_state_handler, NULL);
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/*
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* opt out of system RAM being allocated by generic code
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*/
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mc->default_ram_id = NULL;
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return 0;
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}
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static void xen_accel_class_init(ObjectClass *oc, void *data)
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{
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AccelClass *ac = ACCEL_CLASS(oc);
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static GlobalProperty compat[] = {
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{ "migration", "store-global-state", "off" },
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{ "migration", "send-configuration", "off" },
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{ "migration", "send-section-footer", "off" },
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};
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ac->name = "Xen";
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ac->init_machine = xen_init;
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ac->setup_post = xen_setup_post;
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ac->allowed = &xen_allowed;
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ac->compat_props = g_ptr_array_new();
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compat_props_add(ac->compat_props, compat, G_N_ELEMENTS(compat));
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object_class_property_add_bool(oc, "igd-passthru",
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xen_get_igd_gfx_passthru, xen_set_igd_gfx_passthru);
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object_class_property_set_description(oc, "igd-passthru",
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"Set on/off to enable/disable igd passthrou");
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}
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#define TYPE_XEN_ACCEL ACCEL_CLASS_NAME("xen")
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static const TypeInfo xen_accel_type = {
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.name = TYPE_XEN_ACCEL,
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.parent = TYPE_ACCEL,
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.class_init = xen_accel_class_init,
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};
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static void xen_type_init(void)
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{
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type_register_static(&xen_accel_type);
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}
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type_init(xen_type_init);
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