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Add a default_bus_bypass_iommu pc machine option to enable/disable bypass_iommu for default root bus. The option is disabled by default and can be enabled with: $QEMU -machine q35,default_bus_bypass_iommu=true Signed-off-by: Xingang Wang <wangxingang5@huawei.com> Message-Id: <1625748919-52456-5-git-send-email-wangxingang5@huawei.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>