[PATCH v3 0/2] amd_iommu: Cleanups and fixes (PART 2)

[Sairaj Kodilkar <sarunkod@amd.com>]

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/20251013050046.393-1-sarunkod@amd.com/
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]


* Changes Since V1:
https://lore.kernel.org/qemu-devel/20251008164324.21553-1-sarunkod@amd.com/
P1:
 - Use fixed type uint8_t for devfn
 - Use uintptr_t instead of uint64_t
 - Build hash key using lower 56 bits of bus pointer and 8 bits of devfn
 - Use gboolean instead of int for amdvi_find_as_by_devid
 - Update comments
 - Use IOMMU_NOTIFIER_NONE instead of IOMMU_NONE

P2:
 - Reword commit message
 - Correctly initialize `struct amdvi_iotlb_key`
 - Remove unused macro

-------------------------------------------------------------------------------

Base commit: (qemu uptream) eb7abb4a719f

-------------------------------------------------------------------------------


Sairaj Kodilkar (2):
  amd_iommu: Fix handling device on buses != 0
  amd_iommu: Support 64 bit address for IOTLB lookup

 hw/i386/amd_iommu.c | 179 +++++++++++++++++++++++++++-----------------
 hw/i386/amd_iommu.h |   6 +-
 2 files changed, 113 insertions(+), 72 deletions(-)

-- 
2.34.1