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Dear mailinglist, I own a Gigabyte motherboard GA 970A UD3 with IOMMU support. Since the update XSA-36 (also part of the latest debian wheezy pkg), the IO-Virtualisation does not work any more as discussed on this mailinglist [0] and [1]. I like to ask, if there is an "official" solution in sight. I''m not sure about my alternatives. How "dangerous" is the

...e of this vulnerability. MITIGATION ========== This issue can be avoided by not assigning PCI devices to untrusted guests. In Xen versions 4.1.3 and above the sharing of the interrupt remapping table (and hence the more severe part of this problem) can be avoided by passing "iommu=amd-iommu-perdev-intremap" as a command line option to the hypervisor. This option is not fully functional on earlier hypervisors. RESOLUTION ========== Applying the appropriate attached patch resolves this issue. Note that on certain systems (SP5100 chipsets with erratum 28 present, or such with broken IV...

Hi! From other people posting to this list, I know that there has been a bug related to the issue described in Xen Security Advisory 36 that disables iommu for some AMD users like me. However, even when passing "iommu=no-amd-iommu-perdev-intremap" it still disables i/o virtualisatoin. Related Xen dmesg output: (XEN) IVHD Error: Invalid IO-APIC 0 (XEN) AMD-Vi: Error initialization (XEN) I/O virtualisation disabled Is there _any_ way I can fix this to make IOMMU work again? Updating my BIOS had no effect. I''m using X...

Hi, unfortunatly your latest change "AMD,IOMMU: Clean up old entries in remapping tables when creating new one" (Changeset 26517 in xen-unstable and 25975 in xen-4.2-testing) is causing a CPU0 Panic at boot for me. When i tried to boot latest versions of xen unstable or xen-testing, my dom0 gives me the message: (XEN) ************************************* (XEN) Panic on CPU 0: (XEN)

...about what to fix, which I don''t know either. Could you pls. give me some hints which I can forward to the manufacturer support? Thanks a lot & best regards Hans PS: Hardware is a Gigabyte GA-970A-UD3(rev. 1.0), BIOS F7 (tested F8a, too). PPS: I know about ''no-amd-iommu-perdev-intremap'' - this does not really help as e.g. heavy i/o on a usb device in one domain causes other domains to disable the related irq etc. ... From the support mail: "Our hardware team replied: Please inform us what settings or specific detail he needs to modify on IVRS ACPI Ta...

...e the second one is wrong. > > -boris > > > > Thanks a lot & best regards > > Hans > > > > > > > > PS: Hardware is a Gigabyte GA-970A-UD3(rev. 1.0), BIOS F7 (tested F8a, too). > > > > PPS: I know about ''no-amd-iommu-perdev-intremap'' - this does not really help > > as e.g. heavy i/o on a usb device in one domain causes other domains to > > disable the related irq etc. ...

...PCI passthrough does not work. That is due to:: (XEN) IVHD Error: Invalid IO-APIC 0xff (XEN) AMD-Vi: Error initialization (XEN) I/O virtualisation disabled A bit of Googling and I add in "no-amd-iommu-perdev-intremap,no-intremap" That combination looks to blow up the box. If I just do: 'iommu=verbose,debug,no-intremap' it shows that IOMMU is enabled (yeey) (XEN) AMD-Vi: IOMMU 0 Enabled. (XEN) I/O virtualisation enabled and it boots! But...

.../x86/irq.c +++ b/xen/arch/x86/irq.c @@ -399,7 +399,8 @@ static vmask_t *irq_get_used_vector_mask { vmask_t *ret = NULL; - if ( opt_irq_vector_map == OPT_IRQ_VECTOR_MAP_GLOBAL ) + if ( opt_irq_vector_map == OPT_IRQ_VECTOR_MAP_GLOBAL || + opt_irq_vector_map == OPT_IRQ_VECTOR_MAP_PERDEV_GLOBAL ) { struct irq_desc *desc = irq_to_desc(irq); diff -r 84e4d183fa8b -r 6671fc79717a xen/drivers/passthrough/amd/pci_amd_iommu.c --- a/xen/drivers/passthrough/amd/pci_amd_iommu.c +++ b/xen/drivers/passthrough/amd/pci_amd_iommu.c @@ -238,6 +238,21 @@ int __init amd_iov_detect(vo...

...stalls several times. (It also stalls on shutdown BTW) I have bisected it to this commit running kernel 3.10.2 and Debian wheezy. xl-dmesg and dmesg from a boot with stall are attached, snippet from dmesg with RCU stall appended below. Note that i do have to run with iommu=''no-amd-iommu-perdev-intremap'' due to the bios bug that probably will never get fixed. When i run without the ''no-amd-iommu-perdev-intremap'' the iommu is disabled and stalls do not occur. -- Sander [ 13.066802] udevd[1548]: starting version 175 [ 13.250159] usb 4-5: New USB device foun...