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updated the readme

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Geoffrey McRae 2017-11-01 03:48:48 +11:00
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@ -139,10 +139,12 @@ guest.
Results Results
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Latency has not been measured but it is sufficient to say that it would be Latency has not yet been measured, but in practice to this author it is
difficult to obtain an accurate measurement. In practice to this author it is extremely hard to notice any latency between the physical display and host
impossible to see any latency between the physical display and host client client output when streaming 24bit RGB. When streaming YUV422P there no
output. percevable latency at all, this indicates that the memory copy is the slowest
part of the process. To combat this multi-threaded memory copy has been
implemented on both the host and guest ends of the transfer.
At this time we are waiting for a signed ivshmem driver by Red Hat to be At this time we are waiting for a signed ivshmem driver by Red Hat to be
released but since this may take quite some time we are currently in the released but since this may take quite some time we are currently in the
@ -151,12 +153,15 @@ process of obtaining a driver signing certificate.
Status Status
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The guest software at current needs to be rewritten, in it's current state it The host software is considered 90% complete for devices that are capable of
is simply proof of concept. NvFBC and has been written in such as way to allow for other capture interfaces
to be easily added to support other platforms.
The host software is considered 90% complete, features such as copy & paste The client software is considered 90% complete, features such as copy & paste
between client and guest are missing and it would be nice if it could also between client and host are missing and it would be nice if it could also
serve as the ivshmem-server. serve as the ivshmem-server. The client is able to support a variaty of pixel
formats types depending on the capability and performance of the capture API
that is in use.
Security Security
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@ -169,6 +174,19 @@ At this time this is not a concern as our use case of this application at this
time is in a completely trusted environment, but before it is more widely put time is in a completely trusted environment, but before it is more widely put
into use this will need to be addressed. into use this will need to be addressed.
Improvements
------------
It may be possible to avoid the additional copy by handing the guest a block
of memory directly from the hosts graphics device. This would allow the guest
to stream directly into the texture on the host. This however could be another
avenue of escape for malicious code on the guest and would need very careful
consideration before any attempt is made to implement this.
To achieve the above it would be required to modify qemu integrating the
features of this client directly so that a SDL\_Texture's RAM could be mapped
directly into the guest.
License License
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