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hw/arm/virt: Add default_bus_bypass_iommu machine option

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Add a default_bus_bypass_iommu machine option to enable/disable
bypass_iommu for default root bus. The option is disabled by
default and can be enabled with:
$QEMU -machine virt,iommu=smmuv3,default_bus_bypass_iommu=true

Signed-off-by: Xingang Wang <wangxingang5@huawei.com>
Message-Id: <1625748919-52456-4-git-send-email-wangxingang5@huawei.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Xingang Wang 2021-07-08 12:55:13 +00:00 committed by Michael S. Tsirkin
parent 91528f40ba
commit 6d7a85483a
2 changed files with 27 additions and 0 deletions
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26
hw/arm/virt.c
View File

@ -1367,6 +1367,7 @@ static void create_pcie(VirtMachineState *vms)
}
pci = PCI_HOST_BRIDGE(dev);
pci->bypass_iommu = vms->default_bus_bypass_iommu;
vms->bus = pci->bus;
if (vms->bus) {
for (i = 0; i < nb_nics; i++) {
@ -2322,6 +2323,21 @@ static void virt_set_iommu(Object *obj, const char *value, Error **errp)
}
}
static bool virt_get_default_bus_bypass_iommu(Object *obj, Error **errp)
{
VirtMachineState *vms = VIRT_MACHINE(obj);
return vms->default_bus_bypass_iommu;
}
static void virt_set_default_bus_bypass_iommu(Object *obj, bool value,
Error **errp)
{
VirtMachineState *vms = VIRT_MACHINE(obj);
vms->default_bus_bypass_iommu = value;
}
static CpuInstanceProperties
virt_cpu_index_to_props(MachineState *ms, unsigned cpu_index)
{
@ -2661,6 +2677,13 @@ static void virt_machine_class_init(ObjectClass *oc, void *data)
"Set the IOMMU type. "
"Valid values are none and smmuv3");
object_class_property_add_bool(oc, "default_bus_bypass_iommu",
virt_get_default_bus_bypass_iommu,
virt_set_default_bus_bypass_iommu);
object_class_property_set_description(oc, "default_bus_bypass_iommu",
"Set on/off to enable/disable "
"bypass_iommu for default root bus");
object_class_property_add_bool(oc, "ras", virt_get_ras,
virt_set_ras);
object_class_property_set_description(oc, "ras",
@ -2728,6 +2751,9 @@ static void virt_instance_init(Object *obj)
/* Default disallows iommu instantiation */
vms->iommu = VIRT_IOMMU_NONE;
/* The default root bus is attached to iommu by default */
vms->default_bus_bypass_iommu = false;
/* Default disallows RAS instantiation */
vms->ras = false;

1
include/hw/arm/virt.h
View File

@ -147,6 +147,7 @@ struct VirtMachineState {
OnOffAuto acpi;
VirtGICType gic_version;
VirtIOMMUType iommu;
bool default_bus_bypass_iommu;
VirtMSIControllerType msi_controller;
uint16_t virtio_iommu_bdf;
struct arm_boot_info bootinfo;