On 10/17/2025 11:43 AM, Sairaj Kodilkar wrote:
This series provide fixes for following two issues: 1. AMD IOMMU fails to detect the devices when they are attached to PCI bus with bus id != 0. e.g. With following command line, dhclient command fails inside the guest -device pcie-root-port,port=0x10,chassis=1,id=pci.1,bus=pcie.0,multifunction=on,addr=0x5 \ -netdev user,id=USER0,hostfwd=tcp::3333-:22 \ -device virtio-net-pci,id=vnet0,iommu_platform=on,disable-legacy=on,romfile=,netdev=USER0,bus=pci.1,addr=0 \ 2. Current AMD IOMMU supports IOVAs upto 60 bit which cause failure while setting up the devices when guest is booted with command line "iommu.forcedac=1". One example of the failure is when there are two virtio ethernet devices attached to the guest with command line-netdev user,id=USER0 \-netdev user,id=USER1 \ -device virtio-net-pci,id=vnet0,iommu_platform=on,disable-legacy=on,romfile=,netdev=USER0 \ -device virtio-net-pci,id=vnet1,iommu_platform=on,disable-legacy=on,romfile=,netdev=USER1 \In this case dhclient fails for second device with following dmesg [ 24.802644] virtio_net virtio0 enp0s1: TX timeout on queue: 0, sq: output.0, vq: 0x1, name: output.0, 5664000 usecs ago[ 29.856716] virtio_net virtio0 enp0s1: NETDEV WATCHDOG: CPU: 59: transmit queue 0 timed out 10720 ms [ 29.858585] virtio_net virtio0 enp0s1: TX timeout on queue: 0, sq: output.0, vq: 0x1, name: output.0, 10720000 usecs ago ------------------------------------------------------------------------------- Change log: ---------- * Changes since V2: https://lore.kernel.org/qemu-devel/[email protected]/ P1: - Remove cast from the pointer assignment [MST] - Rename struct amdvi_as_key to AMDViAsKey [Alejandro, MST] - Fix compilation error due to missing 'static' [Alejandro] P2: - Rename struct amdvi_iotlb_key to AMDViIOTLBKey [Alejandro, MST] - Fix compilation error [Alejandro]
Correction... This is AMDVIAskey and AMDVIIOTLBKey, not AMDViAsKey and AMDViIOTLBKey Thanks Sairaj
