search for: pci_dma_configur

...#39;t provide a device-tree, the virtio-iommu device > contains a description of the endpoints it manages. That information > allows us to probe endpoints after the IOMMU is probed (possibly as late > as userspace modprobe), provided it is discovered early enough. > > Add a hook to pci_dma_configure(), which returns -EPROBE_DEFER if the > endpoint is managed by a vIOMMU that will be loaded later, or 0 in any > other case to avoid disturbing the normal DMA configuration methods. > When CONFIG_VIRTIO_IOMMU_TOPOLOGY isn't selected, the call to > virt_dma_configure() is compiled o...

...rtual platforms that don't provide a device-tree, the virtio-iommu device contains a description of the endpoints it manages. That information allows us to probe endpoints after the IOMMU is probed (possibly as late as userspace modprobe), provided it is discovered early enough. Add a hook to pci_dma_configure(), which returns -EPROBE_DEFER if the endpoint is managed by a vIOMMU that will be loaded later, or 0 in any other case to avoid disturbing the normal DMA configuration methods. When CONFIG_VIRTIO_IOMMU_TOPOLOGY isn't selected, the call to virt_dma_configure() is compiled out. As long as the...

Add topology description to the virtio-iommu driver and enable x86 platforms. Since the RFC [1] I've mostly given up on ACPI tables, since the internal discussions seem to have reached a dead end. The built-in topology description presented here isn't ideal, but it is simple to implement and doesn't impose a dependency on ACPI or device-tree, which can be beneficial to lightweight

On Tue, May 05, 2020 at 03:00:04PM +0530, Bharat Bhushan wrote: > Different endpoint can support different page size, probe > endpoint if it supports specific page size otherwise use > global page sizes. > > Signed-off-by: Bharat Bhushan <bbhushan2 at marvell.com> > --- > v4->v5: > - Rebase to Linux v5.7-rc4 > > v3->v4: > - Fix whitespace error >

The interaction between virtio and IOMMUs is messy. On most systems with virtio, physical addresses match bus addresses, and it doesn't particularly matter which one we use to program the device. On some systems, including Xen and any system with a physical device that speaks virtio behind a physical IOMMU, we must program the IOMMU for virtio DMA to work at all. On other systems, including

The interaction between virtio and IOMMUs is messy. On most systems with virtio, physical addresses match bus addresses, and it doesn't particularly matter which one we use to program the device. On some systems, including Xen and any system with a physical device that speaks virtio behind a physical IOMMU, we must program the IOMMU for virtio DMA to work at all. On other systems, including

...ci-driver.c @@ -17,6 +17,7 @@ #include <linux/suspend.h> #include <linux/kexec.h> #include <linux/of_device.h> +#include <linux/virtio_iommu.h> #include <linux/acpi.h> #include "pci.h" #include "pcie/portdrv.h" @@ -1633,6 +1634,8 @@ static int pci_dma_configure(struct device *dev) struct acpi_device *adev = to_acpi_device_node(bridge->fwnode); ret = acpi_dma_configure(dev, acpi_get_dma_attr(adev)); + } else if (IS_ENABLED(CONFIG_VIRTIO_IOMMU_TOPOLOGY)) { + ret = virt_dma_configure(dev); } pci_put_host_bridge_device(bridge); diff --git a...

...lude <linux/suspend.h> > #include <linux/kexec.h> > #include <linux/of_device.h> > +#include <linux/virtio_iommu.h> > #include <linux/acpi.h> > #include "pci.h" > #include "pcie/portdrv.h" > @@ -1633,6 +1634,8 @@ static int pci_dma_configure(struct device *dev) > struct acpi_device *adev = to_acpi_device_node(bridge->fwnode); > > ret = acpi_dma_configure(dev, acpi_get_dma_attr(adev)); > + } else if (IS_ENABLED(CONFIG_VIRTIO_IOMMU_TOPOLOGY)) { > + ret = virt_dma_configure(dev); > } > > pci_put_...

Add a topology description to the virtio-iommu driver and enable x86 platforms. Since [v2] we have made some progress on adding ACPI support for virtio-iommu, which is the preferred boot method on x86. It will be a new vendor-agnostic table describing para-virtual topologies in a minimal format. However some platforms don't use either ACPI or DT for booting (for example microvm), and will

Add a topology description to the virtio-iommu driver and enable x86 platforms. Since [v2] we have made some progress on adding ACPI support for virtio-iommu, which is the preferred boot method on x86. It will be a new vendor-agnostic table describing para-virtual topologies in a minimal format. However some platforms don't use either ACPI or DT for booting (for example microvm), and will

I'm seeking feedback on multi-platform support for virtio-iommu. At the moment only devicetree (DT) is supported and we don't have a pleasant solution for other platforms. Once we figure out the topology description, x86 support is trivial. Since the IOMMU manages memory accesses from other devices, the guest kernel needs to initialize the IOMMU before endpoints start issuing DMA.

I'm seeking feedback on multi-platform support for virtio-iommu. At the moment only devicetree (DT) is supported and we don't have a pleasant solution for other platforms. Once we figure out the topology description, x86 support is trivial. Since the IOMMU manages memory accesses from other devices, the guest kernel needs to initialize the IOMMU before endpoints start issuing DMA.