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ehci: Walk async schedule before and after migration

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Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Hans de Goede 2012-09-12 15:08:33 +02:00 committed by Gerd Hoffmann
parent 8f5457eb04
commit ceab6f9645
1 changed files with 28 additions and 0 deletions
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28
hw/usb/hcd-ehci.c
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@ -34,6 +34,7 @@
#include "monitor.h"
#include "trace.h"
#include "dma.h"
#include "sysemu.h"
#define EHCI_DEBUG 0
@ -2572,6 +2573,32 @@ static int usb_ehci_post_load(void *opaque, int version_id)
return 0;
}
static void usb_ehci_vm_state_change(void *opaque, int running, RunState state)
{
EHCIState *ehci = opaque;
/*
* We don't migrate the EHCIQueue-s, instead we rebuild them for the
* schedule in guest memory. We must do the rebuilt ASAP, so that
* USB-devices which have async handled packages have a packet in the
* ep queue to match the completion with.
*/
if (state == RUN_STATE_RUNNING) {
ehci_advance_async_state(ehci);
}
/*
* The schedule rebuilt from guest memory could cause the migration dest
* to miss a QH unlink, and fail to cancel packets, since the unlinked QH
* will never have existed on the destination. Therefor we must flush the
* async schedule on savevm to catch any not yet noticed unlinks.
*/
if (state == RUN_STATE_SAVE_VM) {
ehci_advance_async_state(ehci);
ehci_queues_rip_unseen(ehci, 1);
}
}
static const VMStateDescription vmstate_ehci = {
.name = "ehci",
.version_id = 2,
@ -2721,6 +2748,7 @@ static int usb_ehci_initfn(PCIDevice *dev)
usb_packet_init(&s->ipacket);
qemu_register_reset(ehci_reset, s);
qemu_add_vm_change_state_handler(usb_ehci_vm_state_change, s);
memory_region_init(&s->mem, "ehci", MMIO_SIZE);
memory_region_init_io(&s->mem_caps, &ehci_mmio_caps_ops, s,