Re: [Xen-devel] [PATCH v2] VMX: don't allow PVH to reach handle_mmio()

[Roger Pau Monné <roger.pau@xxxxxxxxxx>]

El 09/12/14 a les 18.19, Jan Beulich ha escrit:
>>>> On 09.12.14 at 18:01, <roger.pau@xxxxxxxxxx> wrote:
>> For 4.6 I think we need to start using a different hvm_io_bitmap for PVH
>> Dom0 that allows direct access to the IO ports, bypassing the vmexit and
>> simplifying the code in Xen (this would also fix INS/OUTS). Still not
>> sure what should be done for PVH DomUs, specially when PVH gains support
>> for pci-passthrough.
> 
> With the difficulty being that for PV the hypervisor intentionally
> intercepts accesses to some of the ports, so we can't blindly
> allow PVH access to all the ports its allowed access to.

I assume this is mainly for DomUs but not for Dom0? Or should PVH Dom0
access to the IO space also be filtered and emulated for some ports?

Roger.


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