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Re: [Xen-devel] [v6][PATCH 2/2] xen:vtd: missing RMRR mapping while share EPT

 >> It should suffice to give 3 Gb (or event slightly less) of memory to
 >> the DomU (if your Dom0 can hopefully tolerate running with just 1Gb).
 > Yes. So I can't produce that real case of conflict with those existing
 > RMRR in my platform.

When you pass 3Gb to the guest, its memory map should extend to
about 0xC0000000, well beyond the range the RMRRs reference. So

Yes. So I set memory size as 2816M which also cover all RMRR ranges in my platform.

you ought to be able to see the collision (or if you don't you ought to
have ways to find out why they're not happening, as that would be a
sign of something else being bogus).

Then I can see that work as we expect:

# xl cr hvm.cfg
Parsing config from hvm.cfg
libxl: error: libxl_pci.c:949:do_pci_add: xc_assign_device failed: Operation not permitted libxl: error: libxl_create.c:1329:domcreate_attach_pci: libxl_device_pci_add failed: -3


# xl dmesg
(XEN) [VT-D]iommu.c:1589: d0:PCI: unmap 0000:00:02.0
(XEN) [VT-D]iommu.c:1452: d1:PCI: map 0000:00:02.0
(XEN) Cannot identity map d1:ad000, already mapped to 115d51.
(XEN) [VT-D]iommu.c:2296: IOMMU: mapping reserved region failed
(XEN) XEN_DOMCTL_assign_device: assign 0000:00:02.0 to dom1 failed (-1)
(XEN) [VT-D]iommu.c:1589: d1:PCI: unmap 0000:00:02.0
(XEN) [VT-D]iommu.c:1452: d0:PCI: map 0000:00:02.0


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