Re: [Xen-users] [Xen-devel] Cannot Start Linux Paravirtualized (PV) Guests with Xen 4.2-unstable

[Sergey Zhukov <svg@xxxxxx>]

On Fri, 2012-03-30 at 17:03 +0800, Teo En Ming (Zhang Enming) wrote:
> Dear Sergey Zhukov,
> 
>  From the above Xen kernel message logs, it appears that your computer 
> hardware does not support VT-d or VT-d was not enabled in your Xen 
> installation.
> 
> Thank you very much.
> 


I understand, that something wrong with my installation (hardware or
software). What I want is just to see logs from mmu, to localize the
issue and than resolve it. But I could not enable mmu logs with passing
iommu=verbose as suggested in Xen documentation and don't know other
ways how to enable them.

I suppose iommu enabled by default in Xen 4.1, so it should write at
least something after I've passed iommu=verbose to boot options.

(XEN) Command line: placeholder iommu=verbose

Below are my kernel config options related to MMU and XEN. In my opinion
MMU options are enabled in the kernel, but I am not sure about it.
 
cat /boot/config-3.2.0-19-generic | egrep -i 'xen|mmu'

CONFIG_MMU=y
CONFIG_XEN=y
CONFIG_XEN_DOM0=y
CONFIG_XEN_PRIVILEGED_GUEST=y
CONFIG_XEN_PVHVM=y
CONFIG_XEN_MAX_DOMAIN_MEMORY=128
CONFIG_XEN_SAVE_RESTORE=y
# CONFIG_XEN_DEBUG_FS is not set
CONFIG_GART_IOMMU=y
CONFIG_CALGARY_IOMMU=y
CONFIG_CALGARY_IOMMU_ENABLED_BY_DEFAULT=y
CONFIG_IOMMU_HELPER=y
CONFIG_MMU_NOTIFIER=y
CONFIG_PCI_XEN=y
CONFIG_XEN_PCIDEV_FRONTEND=m
# Near Field Communication (NFC) devices
CONFIG_XEN_BLKDEV_FRONTEND=y
CONFIG_XEN_BLKDEV_BACKEND=m
CONFIG_NETXEN_NIC=m
CONFIG_XEN_NETDEV_FRONTEND=y
CONFIG_XEN_NETDEV_BACKEND=m
CONFIG_INPUT_XEN_KBDDEV_FRONTEND=m
CONFIG_HVC_XEN=y
CONFIG_XEN_WDT=m
CONFIG_XEN_FBDEV_FRONTEND=m
# Xen driver support
CONFIG_XEN_BALLOON=y
CONFIG_XEN_SELFBALLOONING=y
CONFIG_XEN_BALLOON_MEMORY_HOTPLUG=y
CONFIG_XEN_SCRUB_PAGES=y
CONFIG_XEN_DEV_EVTCHN=m
CONFIG_XEN_BACKEND=y
CONFIG_XENFS=m
CONFIG_XEN_COMPAT_XENFS=y
CONFIG_XEN_SYS_HYPERVISOR=y
CONFIG_XEN_XENBUS_FRONTEND=y
CONFIG_XEN_GNTDEV=m
CONFIG_XEN_GRANT_DEV_ALLOC=m
CONFIG_SWIOTLB_XEN=y
CONFIG_XEN_TMEM=y
CONFIG_XEN_PCIDEV_BACKEND=m
CONFIG_IOMMU_API=y
CONFIG_IOMMU_SUPPORT=y
CONFIG_AMD_IOMMU=y
CONFIG_AMD_IOMMU_STATS=y
CONFIG_INTEL_IOMMU=y
# CONFIG_INTEL_IOMMU_DEFAULT_ON is not set
CONFIG_INTEL_IOMMU_FLOPPY_WA=y
# CONFIG_IOMMU_DEBUG is not set
# CONFIG_IOMMU_STRESS is not set
# CONFIG_KVM_MMU_AUDIT is not set


Sergey Zhukov


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