Re: [Qemu-arm] [RFC PATCH 1/2] target/arm/kvm: Translate the MSI doorbell in kvm_arch_fixup_msi_route

["Michael S. Tsirkin" <mst@redhat.com>]

On Thu, Jul 13, 2017 at 12:08:41PM +0530, Bharat Bhushan wrote:
> Fix-up MSI address if it translate via virtual iommu.
> This code is based on http://patchwork.ozlabs.org/patch/785951/
> 
> Signed-off-by: Bharat Bhushan <Bharat.Bhushan@nxp.com>

Links go dead with time. And following links
is hard on reviewers. Please copy the full description
tweaking as appropriate and attribute in commit log.

> ---
>  target/arm/kvm.c | 21 +++++++++++++++++++++
>  1 file changed, 21 insertions(+)
> 
> diff --git a/target/arm/kvm.c b/target/arm/kvm.c
> index 4555468..eff7e8f 100644
> --- a/target/arm/kvm.c
> +++ b/target/arm/kvm.c
> @@ -22,6 +22,9 @@
>  #include "cpu.h"
>  #include "internals.h"
>  #include "hw/arm/arm.h"
> +#include "hw/pci/pci.h"
> +#include "hw/pci/msi.h"
> +#include "hw/virtio/virtio-iommu.h"
>  #include "exec/memattrs.h"
>  #include "exec/address-spaces.h"
>  #include "hw/boards.h"
> @@ -611,6 +614,24 @@ int kvm_arm_vgic_probe(void)
>  int kvm_arch_fixup_msi_route(struct kvm_irq_routing_entry *route,
>                               uint64_t address, uint32_t data, PCIDevice *dev)
>  {
> +    AddressSpace *as = pci_device_iommu_address_space(dev);
> +    IOMMUTLBEntry entry;
> +    IOMMUDevice *sdev;
> +    VirtIOIOMMU *s;
> +
> +    if (as == &address_space_memory) {
> +        return 0;
> +    }
> +
> +    /* MSI doorbell address is translated by an IOMMU */
> +    sdev = container_of(as, IOMMUDevice, as);
> +    s = sdev->viommu;
> +
> +    entry = s->iommu_ops.translate(&sdev->iommu_mr, address, IOMMU_WO);
> +
> +    route->u.msi.address_lo = entry.translated_addr;
> +    route->u.msi.address_hi = entry.translated_addr >> 32;
> +
>      return 0;
>  }
>  
> -- 
> 1.9.3