Re: [Qemu-devel] [PATCH v5 0/3] IOMMU: intel_iommu support map and unmap notifications

[Chao Gao <chao.gao@intel.com>]

On Fri, Oct 21, 2016 at 12:07:18AM +0300, Aviv B.D wrote:
>From: "Aviv Ben-David" <bd.aviv@gmail.com>
>
>* Advertize Cache Mode capability in iommu cap register. 
>  This capability is controlled by "cache-mode" property of intel-iommu device.
>  To enable this option call QEMU with "-device intel-iommu,cache-mode=true".
>
>* On page cache invalidation in intel vIOMMU, check if the domain belong to
>  registered notifier, and notify accordingly.
>
>Currently this patch still doesn't enabling VFIO devices support with vIOMMU 
>present. Current problems:
>* vfio_iommu_map_notify is not aware about memory range belong to specific 
>  VFIOGuestIOMMU.
>* memory_region_iommu_replay hangs QEMU on start up while it itterate over 
>  64bit address space. Commenting out the call to this function enables 
>  workable VFIO device while vIOMMU present.
>
After applying the patch series based on commit ede0cbeb, I run the following cmd:
modprobe vfio-pci
echo 8086 1528 > /sys/bus/pci/drivers/vfio-pci/new_id
echo "0000:03:00.1" > /sys/bus/pci/devices/0000\:03\:00.1/driver/unbind
echo 8086 1528 > /sys/bus/pci/drivers/vfio-pci/new_id
to prepare for assigning nic device.
After that, I try to boot a guest by
qemu-system-x86_64 -boot c -m 4096 -monitor pty -serial stdio --enable-kvm \
-M kernel-irqchip=split -bios bios.bin -smp cpus=288 -hda vdisk.img \
-machine q35 -device intel-iommu,intremap=on,eim=on,cache-mode=true \
-net none -device vfio-pci,host=03:00.1
and however encounter this error:
qemu-system-x86_64: -device vfio-pci,host=03:00.1: iommu map to non memory area e258e000
qemu-system-x86_64: -device vfio-pci,host=03:00.1: iommu map to non memory area e258f000
qemu-system-x86_64: -device vfio-pci,host=03:00.1: iommu map to non memory area e2590000

Do i make some mistakes in this test? How to correct it?

by the way, there is a build error:
qemu/hw/pci-host/apb.c:326:5: error: initialization from incompatible pointer type [-Werror]
     .translate = pbm_translate_iommu,
     ^
qemu/hw/pci-host/apb.c:326:5: error: (near initialization for \u2018pbm_iommu_ops.translate\u2019) [-Werror]
cc1: all warnings being treated as errors
make: *** [hw/pci-host/apb.o] Error 1 
>
>-- 
>1.9.1
>
>