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* [PATCH v11 0/7] x86/kvm/hyper-v: add support for synthetic debugger
@ 2020-04-24 11:37 Jon Doron
  2020-04-24 11:37 ` [PATCH v11 1/7] x86/kvm/hyper-v: Explicitly align hcall param for kvm_hyperv_exit Jon Doron
                   ` (7 more replies)
  0 siblings, 8 replies; 22+ messages in thread
From: Jon Doron @ 2020-04-24 11:37 UTC (permalink / raw)
  To: kvm, linux-hyperv; +Cc: vkuznets, Jon Doron

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


^ permalink raw reply	[flat|nested] 22+ messages in thread

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Thread overview: 22+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-04-24 11:37 [PATCH v11 0/7] x86/kvm/hyper-v: add support for synthetic debugger Jon Doron
2020-04-24 11:37 ` [PATCH v11 1/7] x86/kvm/hyper-v: Explicitly align hcall param for kvm_hyperv_exit Jon Doron
2020-05-13  8:42   ` Roman Kagan
2020-04-24 11:37 ` [PATCH v11 2/7] x86/kvm/hyper-v: Simplify addition for custom cpuid leafs Jon Doron
2020-05-13  9:24   ` Roman Kagan
2020-05-13 12:49     ` Jon Doron
2020-05-29 11:13       ` Paolo Bonzini
2020-04-24 11:37 ` [PATCH v11 3/7] x86/hyper-v: Add synthetic debugger definitions Jon Doron
2020-04-24 11:37 ` [PATCH v11 4/7] x86/kvm/hyper-v: Add support for synthetic debugger capability Jon Doron
2020-05-29 10:46   ` Paolo Bonzini
2020-05-29 12:08     ` Vitaly Kuznetsov
2020-05-29 12:17       ` Paolo Bonzini
2020-04-24 11:37 ` [PATCH v11 5/7] x86/kvm/hyper-v: enable hypercalls without hypercall page with syndbg Jon Doron
2020-05-13  9:57   ` Roman Kagan
2020-05-13 12:37     ` Jon Doron
2020-05-29 10:48   ` Paolo Bonzini
2020-04-24 11:37 ` [PATCH v11 6/7] x86/kvm/hyper-v: Add support for synthetic debugger via hypercalls Jon Doron
2020-05-12 15:33   ` Roman Kagan
2020-05-13 12:39     ` Jon Doron
2020-04-24 11:37 ` [PATCH v11 7/7] KVM: selftests: update hyperv_cpuid with SynDBG tests Jon Doron
2020-05-07  3:01 ` [PATCH v11 0/7] x86/kvm/hyper-v: add support for synthetic debugger Jon Doron
2020-05-07  7:57   ` Paolo Bonzini

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