From c2496b293bb914478980b6d9cc8bfd0438e88efe Mon Sep 17 00:00:00 2001 From: Marcel Apfelbaum Date: Sun, 24 Jul 2016 16:28:59 +0200 Subject: [PATCH 19/35] hw/pci: delay bus_master_enable_region initialization RH-Author: Marcel Apfelbaum Message-id: <1469377743-9714-10-git-send-email-marcel@redhat.com> Patchwork-id: 71376 O-Subject: [RHEL-7.3 qemu-kvm-rhev PATCH 09/13] hw/pci: delay bus_master_enable_region initialization Bugzilla: 1350196 RH-Acked-by: Auger Eric RH-Acked-by: Laurent Vivier RH-Acked-by: Peter Xu Skip bus_master_enable region creation on PCI device init in order to be sure the IOMMU device (if present) would be created in advance. Add this memory region at machine_done time. Signed-off-by: Marcel Apfelbaum Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin (cherry picked from commit b86eacb804bdb92acc48cab8cd2a465714a829ab) Signed-off-by: Marcel Apfelbaum Signed-off-by: Miroslav Rezanina --- hw/pci/pci.c | 41 ++++++++++++++++++++++++++++++++--------- include/hw/pci/pci_bus.h | 2 ++ include/sysemu/sysemu.h | 1 + vl.c | 5 +++++ 4 files changed, 40 insertions(+), 9 deletions(-) diff --git a/hw/pci/pci.c b/hw/pci/pci.c index 87bea47..b06e26f 100644 --- a/hw/pci/pci.c +++ b/hw/pci/pci.c @@ -78,10 +78,37 @@ static const VMStateDescription vmstate_pcibus = { } }; +static void pci_init_bus_master(PCIDevice *pci_dev) +{ + AddressSpace *dma_as = pci_device_iommu_address_space(pci_dev); + + memory_region_init_alias(&pci_dev->bus_master_enable_region, + OBJECT(pci_dev), "bus master", + dma_as->root, 0, memory_region_size(dma_as->root)); + memory_region_set_enabled(&pci_dev->bus_master_enable_region, false); + address_space_init(&pci_dev->bus_master_as, + &pci_dev->bus_master_enable_region, pci_dev->name); +} + +static void pcibus_machine_done(Notifier *notifier, void *data) +{ + PCIBus *bus = container_of(notifier, PCIBus, machine_done); + int i; + + for (i = 0; i < ARRAY_SIZE(bus->devices); ++i) { + if (bus->devices[i]) { + pci_init_bus_master(bus->devices[i]); + } + } +} + static void pci_bus_realize(BusState *qbus, Error **errp) { PCIBus *bus = PCI_BUS(qbus); + bus->machine_done.notify = pcibus_machine_done; + qemu_add_machine_init_done_notifier(&bus->machine_done); + vmstate_register(NULL, -1, &vmstate_pcibus, bus); } @@ -89,6 +116,8 @@ static void pci_bus_unrealize(BusState *qbus, Error **errp) { PCIBus *bus = PCI_BUS(qbus); + qemu_remove_machine_init_done_notifier(&bus->machine_done); + vmstate_unregister(NULL, &vmstate_pcibus, bus); } @@ -920,7 +949,6 @@ static PCIDevice *do_pci_register_device(PCIDevice *pci_dev, PCIBus *bus, PCIConfigReadFunc *config_read = pc->config_read; PCIConfigWriteFunc *config_write = pc->config_write; Error *local_err = NULL; - AddressSpace *dma_as; DeviceState *dev = DEVICE(pci_dev); pci_dev->bus = bus; @@ -961,15 +989,10 @@ static PCIDevice *do_pci_register_device(PCIDevice *pci_dev, PCIBus *bus, pci_dev->devfn = devfn; pci_dev->requester_id_cache = pci_req_id_cache_get(pci_dev); - dma_as = pci_device_iommu_address_space(pci_dev); - - memory_region_init_alias(&pci_dev->bus_master_enable_region, - OBJECT(pci_dev), "bus master", - dma_as->root, 0, memory_region_size(dma_as->root)); - memory_region_set_enabled(&pci_dev->bus_master_enable_region, false); - address_space_init(&pci_dev->bus_master_as, &pci_dev->bus_master_enable_region, - name); + if (qdev_hotplug) { + pci_init_bus_master(pci_dev); + } pstrcpy(pci_dev->name, sizeof(pci_dev->name), name); pci_dev->irq_state = 0; pci_config_alloc(pci_dev); diff --git a/include/hw/pci/pci_bus.h b/include/hw/pci/pci_bus.h index 403fec6..5484a9b 100644 --- a/include/hw/pci/pci_bus.h +++ b/include/hw/pci/pci_bus.h @@ -39,6 +39,8 @@ struct PCIBus { Keep a count of the number of devices with raised IRQs. */ int nirq; int *irq_count; + + Notifier machine_done; }; typedef struct PCIBridgeWindows PCIBridgeWindows; diff --git a/include/sysemu/sysemu.h b/include/sysemu/sysemu.h index 19c4cca..b64f728 100644 --- a/include/sysemu/sysemu.h +++ b/include/sysemu/sysemu.h @@ -75,6 +75,7 @@ void qemu_add_exit_notifier(Notifier *notify); void qemu_remove_exit_notifier(Notifier *notify); void qemu_add_machine_init_done_notifier(Notifier *notify); +void qemu_remove_machine_init_done_notifier(Notifier *notify); void hmp_savevm(Monitor *mon, const QDict *qdict); int load_vmstate(const char *name); diff --git a/vl.c b/vl.c index 4efc01c..3a25b48 100644 --- a/vl.c +++ b/vl.c @@ -2736,6 +2736,11 @@ void qemu_add_machine_init_done_notifier(Notifier *notify) } } +void qemu_remove_machine_init_done_notifier(Notifier *notify) +{ + notifier_remove(notify); +} + static void qemu_run_machine_init_done_notifiers(void) { notifier_list_notify(&machine_init_done_notifiers, NULL); -- 1.8.3.1