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| author | Xingang Wang | 2021-07-08 14:55:11 +0200 |
|---|---|---|
| committer | Michael S. Tsirkin | 2021-07-16 17:10:45 +0200 |
| commit | 2d64b7bbb2a2e945635633486ef9a060cb2c89bc (patch) | |
| tree | 0acc3b05c6b68d81ae923f1715aab953dd401a1c /hw/pci | |
| parent | docs: Add '-device intel-iommu' entry (diff) | |
| download | qemu-2d64b7bbb2a2e945635633486ef9a060cb2c89bc.tar.gz qemu-2d64b7bbb2a2e945635633486ef9a060cb2c89bc.tar.xz qemu-2d64b7bbb2a2e945635633486ef9a060cb2c89bc.zip | |
hw/pci/pci_host: Allow PCI host to bypass iommu
Add a new bypass_iommu property for PCI host and use it to check
whether devices attached to the PCI root bus will bypass iommu.
In pci_device_iommu_address_space(), check the property and
avoid getting iommu address space for devices bypass iommu.
Signed-off-by: Xingang Wang <wangxingang5@huawei.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Message-Id: <1625748919-52456-2-git-send-email-wangxingang5@huawei.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'hw/pci')
| -rw-r--r-- | hw/pci/pci.c | 18 | ||||
| -rw-r--r-- | hw/pci/pci_host.c | 1 |
2 files changed, 18 insertions, 1 deletions
diff --git a/hw/pci/pci.c b/hw/pci/pci.c index 377084f1a8..27d588e268 100644 --- a/hw/pci/pci.c +++ b/hw/pci/pci.c @@ -416,6 +416,22 @@ const char *pci_root_bus_path(PCIDevice *dev) return rootbus->qbus.name; } +bool pci_bus_bypass_iommu(PCIBus *bus) +{ + PCIBus *rootbus = bus; + PCIHostState *host_bridge; + + if (!pci_bus_is_root(bus)) { + rootbus = pci_device_root_bus(bus->parent_dev); + } + + host_bridge = PCI_HOST_BRIDGE(rootbus->qbus.parent); + + assert(host_bridge->bus == rootbus); + + return host_bridge->bypass_iommu; +} + static void pci_root_bus_init(PCIBus *bus, DeviceState *parent, MemoryRegion *address_space_mem, MemoryRegion *address_space_io, @@ -2718,7 +2734,7 @@ AddressSpace *pci_device_iommu_address_space(PCIDevice *dev) iommu_bus = parent_bus; } - if (iommu_bus && iommu_bus->iommu_fn) { + if (!pci_bus_bypass_iommu(bus) && iommu_bus && iommu_bus->iommu_fn) { return iommu_bus->iommu_fn(bus, iommu_bus->iommu_opaque, devfn); } return &address_space_memory; diff --git a/hw/pci/pci_host.c b/hw/pci/pci_host.c index 8ca5fadcbd..cf02f0d6a5 100644 --- a/hw/pci/pci_host.c +++ b/hw/pci/pci_host.c @@ -222,6 +222,7 @@ const VMStateDescription vmstate_pcihost = { static Property pci_host_properties_common[] = { DEFINE_PROP_BOOL("x-config-reg-migration-enabled", PCIHostState, mig_enabled, true), + DEFINE_PROP_BOOL("bypass-iommu", PCIHostState, bypass_iommu, false), DEFINE_PROP_END_OF_LIST(), }; |