Re: [PATCH v11 0/7] x86/kvm/hyper-v: add support for synthetic debugger

[Jon Doron <arilou@gmail.com>]

Paolo was this merged in or by any chance in the queue?

Thanks,
-- Jon.

On 24/04/2020, Jon Doron wrote:
>Add support for the synthetic debugger interface of hyper-v, the
>synthetic debugger has 2 modes.
>1. Use a set of MSRs to send/recv information (undocumented so it's not
>   going to the hyperv-tlfs.h)
>2. Use hypercalls
>
>The first mode is based the following MSRs:
>1. Control/Status MSRs which either asks for a send/recv .
>2. Send/Recv MSRs each holds GPA where the send/recv buffers are.
>3. Pending MSR, holds a GPA to a PAGE that simply has a boolean that
>   indicates if there is data pending to issue a recv VMEXIT.
>
>The first mode implementation is to simply exit to user-space when
>either the control MSR or the pending MSR are being set.
>Then it's up-to userspace to implement the rest of the logic of sending/recving.
>
>In the second mode instead of using MSRs KNet will simply issue
>Hypercalls with the information to send/recv, in this mode the data
>being transferred is UDP encapsulated, unlike in the previous mode in
>which you get just the data to send.
>
>The new hypercalls will exit to userspace which will be incharge of
>re-encapsulating if needed the UDP packets to be sent.
>
>There is an issue though in which KDNet does not respect the hypercall
>page and simply issues vmcall/vmmcall instructions depending on the cpu
>type expecting them to be handled as it a real hypercall was issued.
>
>It's important to note that part of this feature has been subject to be
>removed in future versions of Windows, which is why some of the
>defintions will not be present the the TLFS but in the kvm hyperv header
>instead.
>
>v11:
>Fixed all reviewed by and rebased on latest origin/master
>
>Jon Doron (6):
>  x86/kvm/hyper-v: Explicitly align hcall param for kvm_hyperv_exit
>  x86/kvm/hyper-v: Simplify addition for custom cpuid leafs
>  x86/hyper-v: Add synthetic debugger definitions
>  x86/kvm/hyper-v: Add support for synthetic debugger capability
>  x86/kvm/hyper-v: enable hypercalls without hypercall page with syndbg
>  x86/kvm/hyper-v: Add support for synthetic debugger via hypercalls
>
>Vitaly Kuznetsov (1):
>  KVM: selftests: update hyperv_cpuid with SynDBG tests
>
> Documentation/virt/kvm/api.rst                |  18 ++
> arch/x86/include/asm/hyperv-tlfs.h            |   6 +
> arch/x86/include/asm/kvm_host.h               |  14 +
> arch/x86/kvm/hyperv.c                         | 242 ++++++++++++++++--
> arch/x86/kvm/hyperv.h                         |  33 +++
> arch/x86/kvm/trace.h                          |  51 ++++
> arch/x86/kvm/x86.c                            |  13 +
> include/uapi/linux/kvm.h                      |  13 +
> .../selftests/kvm/x86_64/hyperv_cpuid.c       | 143 +++++++----
> 9 files changed, 468 insertions(+), 65 deletions(-)
>
>-- 
>2.24.1
>