The intel-iommu device is currently unusable on big endian hosts. When doing something like this on a s390x host:
wget https://download.fedoraproject.org/pub/fedora/linux/releases/38/Server/x86_64/images/Fedora-Server-KVM-38-1.6.x86_64.qcow2 ./qemu-system-x86_64 -M q35 -device intel-iommu -m 2G \ -hda ~/Fedora-Server-KVM-38-1.6.x86_64.qcow2 -trace "vtd_*" ... the guest kernel crashes during boot, complaining about some problems with the iommu, and you can see clearly in the traces that some values are wrong when compared to running this on a x86 host. After spending quite some time hunting down the problems one by one, I think I now found them all - at least I can successfully boot the above kernel after I applied these patches. Thomas Huth (6): hw/i386/intel_iommu: Fix trivial endianness problems hw/i386/intel_iommu: Fix endianness problems related to VTD_IR_TableEntry hw/i386/intel_iommu: Fix struct VTDInvDescIEC on big endian hosts hw/i386/intel_iommu: Fix index calculation in vtd_interrupt_remap_msi() hw/i386/x86-iommu: Fix endianness issue in x86_iommu_irq_to_msi_message() include/hw/i386/x86-iommu: Fix struct X86IOMMU_MSIMessage for big endian hosts hw/i386/intel_iommu_internal.h | 9 ++++++ include/hw/i386/intel_iommu.h | 50 ++++++++++++++++++---------------- include/hw/i386/x86-iommu.h | 50 ++++++++++++++++++---------------- hw/i386/intel_iommu.c | 23 ++++++++++------ hw/i386/x86-iommu.c | 2 +- 5 files changed, 76 insertions(+), 58 deletions(-) -- 2.39.3
