On Fri, May 09, 2025 at 12:15:24PM +0530, Sairaj Kodilkar wrote: > Fix following two issues in the amd viommu > 1. The guest fails to setup the passthrough device when for following setup > because amd iommu enables the no DMA memory region even when guest is > using DMA remapping mode. > > -device amd-iommu,intremap=on,xtsup=on,pt=on \ > -device vfio-pci,host=<DEVID> \ > > and guest forcing DMA remap mode e.g. 'iommu.passthrough=0' > > which will cause failures from QEMU: > > qemu-system-x86_64: AHCI: Failed to start DMA engine: bad command list > buffer address > qemu-system-x86_64: AHCI: Failed to start FIS receive engine: bad FIS > receive buffer address > qemu-system-x86_64: AHCI: Failed to start DMA engine: bad command list > buffer address > qemu-system-x86_64: AHCI: Failed to start FIS receive engine: bad FIS > receive buffer address > qemu-system-x86_64: AHCI: Failed to start DMA engine: bad command list > buffer address > > > 2. The guest fails to boot with xtsup=on and <= 255 vCPUs, because amd_iommu > does not enable x2apic mode. > > base commit 56c6e249b6988c1b6edc2dd34ebb0f1e570a1365 (v10.0.0-rc3) > > Sairaj Kodilkar (1): > hw/i386/amd_iommu: Fix device setup failure when PT is on. > > Vasant Hegde (1): > hw/i386/amd_iommu: Fix xtsup when vcpus < 255 > > hw/i386/amd_iommu.c | 20 ++++++++++---------- > 1 file changed, 10 insertions(+), 10 deletions(-)
Patches themselves were not posted to list. Only the cover letter. > -- > 2.34.1
