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c5e8d51824
g_new(T, n) is neater than g_malloc(sizeof(T) * n). It's also safer,
for two reasons. One, it catches multiplication overflowing size_t.
Two, it returns T * rather than void *, which lets the compiler catch
more type errors.
This commit only touches allocations with size arguments of the form
sizeof(T).
Patch created mechanically with:
$ spatch --in-place --sp-file scripts/coccinelle/use-g_new-etc.cocci \
--macro-file scripts/cocci-macro-file.h FILES...
The previous iteration was commit a95942b50c.
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Message-Id: <20220923084254.4173111-1-armbru@redhat.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
132 lines
3.4 KiB
C
132 lines
3.4 KiB
C
/**
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* IOMMU for remote device
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*
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* Copyright © 2022 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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*/
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#include "qemu/osdep.h"
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#include "hw/remote/iommu.h"
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#include "hw/pci/pci_bus.h"
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#include "hw/pci/pci.h"
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#include "exec/memory.h"
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#include "exec/address-spaces.h"
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#include "trace.h"
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/**
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* IOMMU for TYPE_REMOTE_MACHINE - manages DMA address space isolation
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* for remote machine. It is used by TYPE_VFIO_USER_SERVER.
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*
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* - Each TYPE_VFIO_USER_SERVER instance handles one PCIDevice on a PCIBus.
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* There is one RemoteIommu per PCIBus, so the RemoteIommu tracks multiple
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* PCIDevices by maintaining a ->elem_by_devfn mapping.
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*
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* - memory_region_init_iommu() is not used because vfio-user MemoryRegions
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* will be added to the elem->mr container instead. This is more natural
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* than implementing the IOMMUMemoryRegionClass APIs since vfio-user
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* provides something that is close to a full-fledged MemoryRegion and
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* not like an IOMMU mapping.
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*
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* - When a device is hot unplugged, the elem->mr reference is dropped so
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* all vfio-user MemoryRegions associated with this vfio-user server are
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* destroyed.
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*/
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static AddressSpace *remote_iommu_find_add_as(PCIBus *pci_bus,
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void *opaque, int devfn)
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{
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RemoteIommu *iommu = opaque;
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RemoteIommuElem *elem = NULL;
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qemu_mutex_lock(&iommu->lock);
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elem = g_hash_table_lookup(iommu->elem_by_devfn, INT2VOIDP(devfn));
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if (!elem) {
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elem = g_new0(RemoteIommuElem, 1);
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g_hash_table_insert(iommu->elem_by_devfn, INT2VOIDP(devfn), elem);
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}
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if (!elem->mr) {
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elem->mr = MEMORY_REGION(object_new(TYPE_MEMORY_REGION));
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memory_region_set_size(elem->mr, UINT64_MAX);
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address_space_init(&elem->as, elem->mr, NULL);
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}
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qemu_mutex_unlock(&iommu->lock);
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return &elem->as;
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}
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void remote_iommu_unplug_dev(PCIDevice *pci_dev)
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{
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AddressSpace *as = pci_device_iommu_address_space(pci_dev);
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RemoteIommuElem *elem = NULL;
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if (as == &address_space_memory) {
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return;
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}
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elem = container_of(as, RemoteIommuElem, as);
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address_space_destroy(&elem->as);
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object_unref(elem->mr);
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elem->mr = NULL;
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}
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static void remote_iommu_init(Object *obj)
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{
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RemoteIommu *iommu = REMOTE_IOMMU(obj);
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iommu->elem_by_devfn = g_hash_table_new_full(NULL, NULL, NULL, g_free);
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qemu_mutex_init(&iommu->lock);
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}
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static void remote_iommu_finalize(Object *obj)
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{
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RemoteIommu *iommu = REMOTE_IOMMU(obj);
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qemu_mutex_destroy(&iommu->lock);
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g_hash_table_destroy(iommu->elem_by_devfn);
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iommu->elem_by_devfn = NULL;
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}
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void remote_iommu_setup(PCIBus *pci_bus)
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{
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RemoteIommu *iommu = NULL;
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g_assert(pci_bus);
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iommu = REMOTE_IOMMU(object_new(TYPE_REMOTE_IOMMU));
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pci_setup_iommu(pci_bus, remote_iommu_find_add_as, iommu);
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object_property_add_child(OBJECT(pci_bus), "remote-iommu", OBJECT(iommu));
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object_unref(OBJECT(iommu));
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}
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static const TypeInfo remote_iommu_info = {
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.name = TYPE_REMOTE_IOMMU,
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.parent = TYPE_OBJECT,
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.instance_size = sizeof(RemoteIommu),
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.instance_init = remote_iommu_init,
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.instance_finalize = remote_iommu_finalize,
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};
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static void remote_iommu_register_types(void)
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{
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type_register_static(&remote_iommu_info);
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}
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type_init(remote_iommu_register_types)
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