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031fbb7110
Do not reset a vfio-pci device during CPR, and do not complain if the kernel's PCI config space changes for non-emulated bits between the vmstate save and load, which can happen due to ongoing interrupt activity. Signed-off-by: Steve Sistare <steven.sistare@oracle.com> Reviewed-by: Cédric Le Goater <clg@redhat.com> Link: https://lore.kernel.org/qemu-devel/1749569991-25171-12-git-send-email-steven.sistare@oracle.com Signed-off-by: Cédric Le Goater <clg@redhat.com>
70 lines
1.9 KiB
C
70 lines
1.9 KiB
C
/*
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* Copyright (c) 2021-2024 Oracle and/or its affiliates.
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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 "hw/vfio/vfio-device.h"
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#include "hw/vfio/vfio-cpr.h"
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#include "hw/vfio/pci.h"
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#include "migration/cpr.h"
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#include "qapi/error.h"
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#include "system/runstate.h"
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int vfio_cpr_reboot_notifier(NotifierWithReturn *notifier,
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MigrationEvent *e, Error **errp)
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{
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if (e->type == MIG_EVENT_PRECOPY_SETUP &&
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!runstate_check(RUN_STATE_SUSPENDED) && !vm_get_suspended()) {
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error_setg(errp,
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"VFIO device only supports cpr-reboot for runstate suspended");
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return -1;
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}
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return 0;
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}
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bool vfio_cpr_register_container(VFIOContainerBase *bcontainer, Error **errp)
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{
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migration_add_notifier_mode(&bcontainer->cpr_reboot_notifier,
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vfio_cpr_reboot_notifier,
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MIG_MODE_CPR_REBOOT);
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return true;
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}
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void vfio_cpr_unregister_container(VFIOContainerBase *bcontainer)
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{
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migration_remove_notifier(&bcontainer->cpr_reboot_notifier);
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}
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/*
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* The kernel may change non-emulated config bits. Exclude them from the
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* changed-bits check in get_pci_config_device.
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*/
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static int vfio_cpr_pci_pre_load(void *opaque)
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{
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VFIOPCIDevice *vdev = opaque;
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PCIDevice *pdev = &vdev->pdev;
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int size = MIN(pci_config_size(pdev), vdev->config_size);
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int i;
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for (i = 0; i < size; i++) {
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pdev->cmask[i] &= vdev->emulated_config_bits[i];
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}
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return 0;
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}
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const VMStateDescription vfio_cpr_pci_vmstate = {
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.name = "vfio-cpr-pci",
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.version_id = 0,
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.minimum_version_id = 0,
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.pre_load = vfio_cpr_pci_pre_load,
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.needed = cpr_incoming_needed,
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.fields = (VMStateField[]) {
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VMSTATE_END_OF_LIST()
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}
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};
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