Re: [Xen-devel] [PATCH v3 0/4] x86/iommu: PVH Dom0 workarounds for missing RMRR entries

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 07.08.18 at 18:04, <tamas.k.lengyel@xxxxxxxxx> wrote:
>> > > > (XEN) [VT-D]iommu.c:919: iommu_fault_status: Fault Overflow
>> > > > (XEN) [VT-D]iommu.c:921: iommu_fault_status: Primary Pending Fault
>> > > > (XEN) [VT-D]DMAR:[DMA Read] Request device [0000:00:02.0] fault addr
>> > > > 4625f3a000, iommu reg = ffff82c00181c000
>> > > > (XEN) [VT-D]DMAR: reason 06 - PTE Read access is not set
>> > > > (XEN) print_vtd_entries: iommu #0 dev 0000:00:02.0 gmfn 4625f3a

So the address here is clearly outside of any RAM:

> (XEN) EFI RAM map:
> (XEN)  0000000000000000 - 0000000000058000 (usable)
> (XEN)  0000000000058000 - 0000000000059000 (reserved)
> (XEN)  0000000000059000 - 000000000009f000 (usable)
> (XEN)  000000000009f000 - 0000000000100000 (reserved)
> (XEN)  0000000000100000 - 000000005f14d000 (usable)
> (XEN)  000000005f14d000 - 000000005f14e000 (ACPI NVS)
> (XEN)  000000005f14e000 - 000000005f14f000 (reserved)
> (XEN)  000000005f14f000 - 000000006ee89000 (usable)
> (XEN)  000000006ee89000 - 000000006f214000 (reserved)
> (XEN)  000000006f214000 - 000000006f258000 (ACPI data)
> (XEN)  000000006f258000 - 000000006f8fd000 (ACPI NVS)
> (XEN)  000000006f8fd000 - 000000006ffff000 (reserved)
> (XEN)  000000006ffff000 - 0000000070000000 (usable)
> (XEN)  0000000070000000 - 0000000078000000 (reserved)
> (XEN)  0000000078000000 - 0000000078600000 (usable)
> (XEN)  0000000078600000 - 000000007c800000 (reserved)
> (XEN)  00000000e0000000 - 00000000f0000000 (reserved)
> (XEN)  00000000fe000000 - 00000000fe011000 (reserved)
> (XEN)  00000000fec00000 - 00000000fec01000 (reserved)
> (XEN)  00000000fee00000 - 00000000fee01000 (reserved)
> (XEN)  00000000ff000000 - 0000000100000000 (reserved)
> (XEN)  0000000100000000 - 0000000281800000 (usable)

And it's also outside of any of the GPU device's BARs. Makes
me wonder what the graphics driver is doing.

Jan



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