From 6b145e32e9e219c723b4911aac0a96ea2aa70e77 Mon Sep 17 00:00:00 2001 From: Hans de Goede Date: Wed, 12 Sep 2012 15:08:33 +0200 Subject: [PATCH] ehci: Walk async schedule before and after migration Signed-off-by: Hans de Goede Signed-off-by: Gerd Hoffmann (cherry picked from commit ceab6f96454fe6589d1b09ce64403c041d79f9d9) Signed-off-by: Michael Roth --- hw/usb/hcd-ehci.c | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) diff --git a/hw/usb/hcd-ehci.c b/hw/usb/hcd-ehci.c index bc86460..6a5da84 100644 --- a/hw/usb/hcd-ehci.c +++ b/hw/usb/hcd-ehci.c @@ -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, -- 1.7.12.1