Re: [Xen-devel] [v7][RFC][PATCH 01/13] xen: RMRR fix

[Tim Deegan <tim@xxxxxxx>]

Hi,

At 15:34 +0800 on 24 Oct (1414161264), Tiejun Chen wrote:
> This series of patches try to reconcile those remaining problems but
> just post as RFC to ask for any comments to refine everything.
> 
> The current whole scheme is as follows:
> 
> 1. Reconcile guest mmio with RMRR in pci_setup
> 2. Reconcile guest RAM with RMRR in e820 table
> 
> Then in theory guest wouldn't access any RMRR range.
> 
> 3. Just initialize all RMRR ranges as p2m_access_n in p2m table:
>     gfn:mfn:p2m_access_n

Please don't use p2m_access for this.  It will conflict with other
users of that interface.  Just clear the entries instead (i.e. set to
p2m_type_invalid).  Then you don't need to do this either:

> 5. Before we take real device assignment, any access to RMRR may issue
> ept_handle_violation because of p2m_access_n. Then we just call
> update_guest_eip() to return.

because the RMRR area will be handled like any other un-backed address.

Cheers,

Tim.

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
http://lists.xen.org/xen-devel