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Re: [PATCH v4 2/2] nvme: allow cmb and pmr to be enabled on same device


From: Klaus Jensen
Subject: Re: [PATCH v4 2/2] nvme: allow cmb and pmr to be enabled on same device
Date: Thu, 2 Jul 2020 19:51:13 +0200

On Jul  2 08:07, Andrzej Jakowski wrote:
> On 7/2/20 3:31 AM, Klaus Jensen wrote:
> > Aight, an update here. This only happens when QEMU is run with a virtual
> > IOMMU. Otherwise, the kernel is happy.
> > 
> > With the vIOMMU, qemu also craps out a bit:
> > 
> > qemu-system-x86_64: vtd_iova_to_slpte: detected slpte permission error 
> > (iova=0xfd200000, level=0x2, slpte=0x0, write=0)
> > qemu-system-x86_64: vtd_iommu_translate: detected translation failure 
> > (dev=03:00:00, iova=0xfd200000)
> > 
> > So I think we are back in QEMU land for the bug.
> 
> Can you share command line for that?
> 
> 

qemu-system-x86_64 \
  -nodefaults \
  -display none \
  -device intel-iommu,pt,intremap=on,device-iotlb=on \
  -machine type=q35,accel=kvm,kernel_irqchip=split \
  -cpu host \
  -smp 4 \
  -m 8G \
  -nic user,model=virtio-net-pci,hostfwd=tcp::2222-:22 \
  -device virtio-rng-pci \
  -drive 
id=boot,file=/home/kbj/work/src/vmctl/state/pmr/boot.qcow2,format=qcow2,if=virtio,discard=on,detect-zeroes=unmap
 \
  -device pcie-root-port,id=pcie_root_port1,chassis=1,slot=0 \
  -device x3130-upstream,id=pcie_upstream1,bus=pcie_root_port1 \
  -device 
xio3130-downstream,id=pcie_downstream1,bus=pcie_upstream1,chassis=1,slot=1 \
  -drive 
id=nvme0n1,file=/home/kbj/work/src/vmctl/state/pmr/nvme0n1.img,format=raw,if=none,discard=on,detect-zeroes=unmap
 \
  -object memory-backend-file,id=pmr,share=on,mem-path=pmr.bin,size=1M \
  -device 
nvme,id=nvme0,serial=deadbeef,bus=pcie_downstream1,drive=nvme0n1,msix_qsize=1,pmrdev=pmr,cmb_size_mb=2
 \
  -pidfile /home/kbj/work/src/vmctl/run/pmr/pidfile \
  -kernel /home/kbj/work/src/kernel/linux/arch/x86_64/boot/bzImage \
  -append root=/dev/vda1 console=ttyS0,115200 audit=0 nokaslr \
  -virtfs 
local,path=/home/kbj/work/src/kernel/linux,security_model=none,readonly,mount_tag=modules
 \
  -serial mon:stdio \
  -trace pci_nvme*





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