search for: initializatin

...TIO_F_IOMMU_PLATFORM flag QEMU expects GPA from guest kernel. > In such case, virtio device must use default virtio_direct_dma_ops DMA OPS > structure which transforms scatter gather buffer addresses as GPA. This > DMA OPS override must happen as early as possible during virtio device > initializatin sequence before virtio core starts using given device's DMA > OPS callbacks for I/O transactions. This change detects device's IOMMU flag > and does the override in case the flag is cleared. > > Signed-off-by: Anshuman Khandual <khandual at linux.vnet.ibm.com> > --- &g...

...TIO_F_IOMMU_PLATFORM flag QEMU expects GPA from guest kernel. > In such case, virtio device must use default virtio_direct_dma_ops DMA OPS > structure which transforms scatter gather buffer addresses as GPA. This > DMA OPS override must happen as early as possible during virtio device > initializatin sequence before virtio core starts using given device's DMA > OPS callbacks for I/O transactions. This change detects device's IOMMU flag > and does the override in case the flag is cleared. > > Signed-off-by: Anshuman Khandual <khandual at linux.vnet.ibm.com> > --- &g...

...n the absence of VIRTIO_F_IOMMU_PLATFORM flag QEMU expects GPA from guest kernel. In such case, virtio device must use default virtio_direct_dma_ops DMA OPS structure which transforms scatter gather buffer addresses as GPA. This DMA OPS override must happen as early as possible during virtio device initializatin sequence before virtio core starts using given device's DMA OPS callbacks for I/O transactions. This change detects device's IOMMU flag and does the override in case the flag is cleared. Signed-off-by: Anshuman Khandual <khandual at linux.vnet.ibm.com> --- drivers/virtio/virtio.c |...

...flag QEMU expects GPA from guest kernel. > > In such case, virtio device must use default virtio_direct_dma_ops DMA OPS > > structure which transforms scatter gather buffer addresses as GPA. This > > DMA OPS override must happen as early as possible during virtio device > > initializatin sequence before virtio core starts using given device's DMA > > OPS callbacks for I/O transactions. This change detects device's IOMMU flag > > and does the override in case the flag is cleared. > > > > Signed-off-by: Anshuman Khandual <khandual at linux.vnet.ibm...

This patch series is the follow up on the discussions we had before about the RFC titled [RFC,V2] virtio: Add platform specific DMA API translation for virito devices (https://patchwork.kernel.org/patch/10417371/). There were suggestions about doing away with two different paths of transactions with the host/QEMU, first being the direct GPA and the other being the DMA API based translations.

This patch series is the follow up on the discussions we had before about the RFC titled [RFC,V2] virtio: Add platform specific DMA API translation for virito devices (https://patchwork.kernel.org/patch/10417371/). There were suggestions about doing away with two different paths of transactions with the host/QEMU, first being the direct GPA and the other being the DMA API based translations.