Re: [RFC PATCH v6 00/92] VM introspection

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On 09/08/19 17:59, Adalbert Lazăr wrote:
> 
> Patches 1-20: unroll a big part of the KVM introspection subsystem,
> sent in one patch in the previous versions.
> 
> Patches 21-24: extend the current page tracking code.
> 
> Patches 25-33: make use of page tracking to support the
> KVMI_SET_PAGE_ACCESS introspection command and the KVMI_EVENT_PF event
> (on EPT violations caused by the tracking settings).
> 
> Patches 34-42: include the SPP feature (Enable Sub-page
> Write Protection Support), already sent to KVM list:
> 
> 	https://lore.kernel.org/lkml/20190717133751.12910-1-weijiang.yang@xxxxxxxxx/
> 
> Patches 43-46: add the commands needed to use SPP.
> 
> Patches 47-63: unroll almost all the rest of the introspection code.
> 
> Patches 64-67: add single-stepping, mostly as a way to overcome the
> unimplemented instructions, but also as a feature for the introspection
> tool.
> 
> Patches 68-70: cover more cases related to EPT violations.
> 
> Patches 71-73: add the remote mapping feature, allowing the introspection
> tool to map into its address space a page from guest memory.
> 
> Patches 74: add a fix to hypercall emulation.
> 
> Patches 75-76: disable some features/optimizations when the introspection
> code is present.
> 
> Patches 77-78: add trace functions for the introspection code and change
> some related to interrupts/exceptions injection.
> 
> Patches 79-92: new instruction for the x86 emulator, including cmpxchg
> fixes.

Thanks for the very good explanation.  Apart from the complicated flow
of KVM request handling and KVM reply, the main issue is the complete
lack of testcases.  There should be a kvmi_test in
tools/testing/selftests/kvm, and each patch adding a new ioctl or event
should add a new testcase.

Paolo
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