Hi All. I made some progress, but still pci-passthrough is not enabled. Following are the bullet-points : a) On host, /proc/cpuinfo shows the following : ######################################## ajay@ajay-Latitude-E6320:~$ cat /proc/cpuinfo | grep vmx | wc -l 4 ######################################## b) On guest, /proc/cpuinfo shows the following : ######################################## ajay@ajay-Standard-PC-i440FX-PIIX-1996:~$ cat /proc/cpuinfo | grep vmx | wc -l 0 ######################################## c) Guest has been booted with intel_iommu on, as confirmed by the following logs : ######################################## Sep 28 20:05:46 ajay-Standard-PC-i440FX-PIIX-1996 kernel: [ 0.025210] Kernel command line: BOOT_IMAGE=/boot/vmlinuz-5.11.0-37-generic root=UUID=a32e7e30-7796-464b-9efc-720eb4fc7706 ro quiet splash intel_iommu=on vt.handoff=7 Sep 28 20:05:46 ajay-Standard-PC-i440FX-PIIX-1996 kernel: [ 0.025301] DMAR: IOMMU enabled ######################################## Note that just one DMAR log is seen. d) On guest, following are the outputs, when trying to observe virtual iommu devices/groups etc : ######################################## ajay@ajay-Standard-PC-i440FX-PIIX-1996:~$ ls -lrth /sys/kernel/iommu_groups/ total 0 ajay@ajay-Standard-PC-i440FX-PIIX-1996:~$ ls -lrth /sys/devices/virtual/iommu ls: cannot access '/sys/devices/virtual/iommu': No such file or directory ######################################## What am I missing? On Tue, Sep 28, 2021 at 1:03 PM Ajay Garg <ajaygargnsit@xxxxxxxxx> wrote: > > Hi All. > > I have the following set up: > > * Host : Ubuntu-16, on a amd64 hardware > * Guest : Ubuntu-21, as a VM on QEMU/KVM. > > > Now, I have a SD-MMC card-reader attached physically on the host, > which is listed as expected if I do lspci on the host : > > ############################################ > ajay@ajay-Latitude-E6320:~/ldd3$ lspci > .... > .... > 0a:00.0 SD Host controller: O2 Micro, Inc. OZ600FJ0/OZ900FJ0/OZ600FJS > SD/MMC Card Reader Controller (rev 05) > .... > ############################################ > > > However, if I try doing lspci on the guest, this pci-device is not listed. > > > > > So, I have the following queries : > > * Would it require enabling pci-passthrough (if not already) in the > guest-kernel, on a global basis? > * Does having raw-physical-access on the guest, require support from > the pci-device itself? > > > My ultimate aim is to get the sd-mmc-driver that I wrote for the > host-machine, to run unmodified on the guest-machine (obviously after > the sd-card-reader is detected on the guest, and the code recompiled > on the guest). > > > Will be grateful for any pointers. > > > Thanks and Regards, > Ajay
