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hyperv: Add support to process syndbg commands

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SynDbg commands can come from two different flows:
1. Hypercalls, in this mode the data being sent is fully
   encapsulated network packets.
2. SynDbg specific MSRs, in this mode only the data that needs to be
   transfered is passed.

Signed-off-by: Jon Doron <arilou@gmail.com>
Reviewed-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
Message-Id: <20220216102500.692781-4-arilou@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Jon Doron 2022-02-16 12:24:59 +02:00 • committed by Paolo Bonzini
parent ccbdf5e81b
commit 73d2407407
8 changed files with 451 additions and 8 deletions
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15
docs/hyperv.txt
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@ -225,6 +225,21 @@ default (WS2016).
Note: hv-version-id-* are not enlightenments and thus don't enable Hyper-V
identification when specified without any other enlightenments.
3.21. hv-syndbg
===============
Enables Hyper-V synthetic debugger interface, this is a special interface used
by Windows Kernel debugger to send the packets through, rather than sending
them via serial/network .
When enabled, this enlightenment provides additional communication facilities
to the guest: SynDbg messages.
This new communication is used by Windows Kernel debugger rather than sending
packets via serial/network, adding significant performance boost over the other
comm channels.
This enlightenment requires a VMBus device (-device vmbus-bridge,irq=15)
and the follow enlightenments to work:
hv-relaxed,hv_time,hv-vapic,hv-vpindex,hv-synic,hv-runtime,hv-stimer
4. Supplementary features
=========================