[vbox-dev] Host/Guest Communication

[André Eberle]

Hello,

I am trying to achieve host guest communication, through DMA in a guest
driver. Also, I am trying to capture the result in the host process, and
act on it. Could you point me to sources with examples of this behavior? It
seems something similar is already done currently in the VirtualBox, is it
so?

Thanks,

Andr?.
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[Frank Mehnert]

Andr?,

Post by André Eberle
I am trying to achieve host guest communication, through DMA in a guest
driver. Also, I am trying to capture the result in the host process, and
act on it. Could you point me to sources with examples of this behavior? It
seems something similar is already done currently in the VirtualBox, is it
so?

as I understand correctly, you intend to establish a communication between
host and guest where you can transfer bigger amounts of data. One example
would be the shared folders service. The guest part is located at

src/VBox/Additions/common/VBoxGuestLib/VBoxGuestR0LibSharedFolders.c
(guest ring 0 abstraction for shared folders functions)
src/VBox/Additions/linux/sharedfolders/
(guest ring 0 Linux driver)

while the host part is located at

src/VBox/HostServices/SharedFolders

The HGCM abstraction is a bit different from the emulation of a physical
device. The guest is issuing HGCM requests to the host. If the host is
able to fulfil the request immediately, it will, otherwise the host returns
VINF_HGCM_ASYNC_EXECUTE and the VBox guest driver will call a callback
function when the request can finally be fulfilled.

Hope that helps,

Frank
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