[Xen-devel] Requesting for freeze exception for RMRR

["Chen, Tiejun" <tiejun.chen@xxxxxxxxx>]

Hi Wei,

Here I'm trying to request the freeze exception for RMRR.

1. clarify the state of patch series / feature.

Reviewed        Acked   RMRR series v7
Y               Y       [v7][PATCH 01/16] xen: introduce 
XENMEM_reserved_device_memory_map
Y               Y       [v7][PATCH 02/16] xen/vtd: create RMRR mapping
Y		N	[v7][PATCH 03/16] xen/passthrough: extend hypercall to support rdm 
reservation policy
Y               Y       [v7][PATCH 04/16] xen: enable XENMEM_memory_map in hvm
Y               N       [v7][PATCH 05/16] hvmloader: get guest memory map into 
memory_map[]
Y               N       [v7][PATCH 06/16] hvmloader/pci: skip reserved ranges
Y               N       [v7][PATCH 07/16] hvmloader/e820: construct guest e820 
table
Y		Y	[v7][PATCH 08/16] tools/libxc: Expose new hypercall 
xc_reserved_device_memory_map
Y		Y	[v7][PATCH 09/16] tools: extend xc_assign_device() to support rdm 
reservation policy
Y		Y	[v7][PATCH 10/16] tools: introduce some new parameters to set rdm 
policy
Y               Y       [v7][PATCH 11/16] tools/libxl: detect and avoid 
conflicts with RDM
Y		Y	[v7][PATCH 12/16] tools: introduce a new parameter to set a 
predefined rdm boundary
Y		Y	[v7][PATCH 13/16] libxl: construct e820 map with RDM information 
for HVM guest
Y               Y       [v7][PATCH 14/16] xen/vtd: enable USB device assignment
Y		Y	[v7][PATCH 15/16] xen/vtd: prevent from assign the device with 
shared rmrr
Y               Y       [v7][PATCH 16/16] tools: parse to enable new rdm policy 
parameters      

Note Jackson and Campbell also raised some comments to improve current 
codes.
2. explain why it needs to be in this release (benefits).

RMRR mechanism was broken for a long time and this makes VM always face 
security issues. In addition, those associated devices can't be passed 
through to VM and even result in VM crashes.
3. explain why it doesn't break things (risks).

Our policy makes sure that system will work in the original way by 
default as without the RMRR patches. And especially, this series just 
impacts those platforms which have RMRR.
4. CC relevant maintainers and release manager.
Done

Cheers,
Tiejun


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