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[RFC PATCH v4 0/4] x86: Add the support of ACRN guest under arch/x86

ACRN is a flexible, lightweight reference hypervisor, built with real-time
and safety-criticality in mind, optimized to streamline embedded development
through an open source platform. It is built for embedded IOT with small
footprint and real-time features. More details can be found
in https://projectacrn.org/

This is the patch set that allows the Linux to work on ACRN hypervisor and it can
work with the following patch set to manage the Linux guest on acrn-hypervisor. It
includes the detection of acrn_hypervisor, upcall notification vector from
hypervisor, hypercall. The hypervisor detection is similar to Xen/VMWARE/Hyperv.
ACRN also uses the upcall notification mechanism similar to that in Xen/Microsoft
HyperV when it needs to send the notification to Linux OS. The hypercall provides
the mechanism that can be used to query/configure the acrn-hypervisor by Linux guest.

Following this patch set, we will send acrn driver part, which provides the interface
that can be used to manage the virtualized CPU/memory/device/interrupt for other guest
OS after the acrn hypervisor is detected.

v1->v2: Change the CONFIG_ACRN to CONFIG_ACRN_GUEST, which makes it easy to
        Remove the export of x86_hyper_acrn.
        Remove the unused API definition of acrn_setup_intr_handler and
        Adjust the order of header file
        Add the declaration of acrn_hv_vector_handler and tracing
definition of acrn_hv_callback_vector.
	Refine the comments for the function of acrn_hypercall0/1/2

v2-v3:  Add one new config symbol to unify the conditional definition
of hv_irq_callback_count
        Use the "vmcall" mnemonic to replace the hard-code byte definition
	Remove the unnecessary dependency of CONFIG_PARAVIRT for ACRN_GUEST

v3-v4:  Rename the file name of acrnhyper.h to acrn.h
	Refine the commit log and some other minor changes(more comments and 
redundant ifdef in acrn.h, sorting the header file in acrn.c)

Zhao Yakui (4):
  x86/Kconfig: Add new config symbol to unify conditional definition of
  x86: Add the support of Linux guest on ACRN hypervisor
  x86/acrn: Use HYPERVISOR_CALLBACK_VECTOR for ACRN guest upcall vector
  x86/acrn: Add hypercall for ACRN guest

 arch/x86/Kconfig                      | 16 +++++++
 arch/x86/entry/entry_64.S             |  5 +++
 arch/x86/include/asm/acrn.h           | 11 +++++
 arch/x86/include/asm/acrn_hypercall.h | 81 +++++++++++++++++++++++++++++++++++
 arch/x86/include/asm/hardirq.h        |  2 +-
 arch/x86/include/asm/hypervisor.h     |  1 +
 arch/x86/kernel/cpu/Makefile          |  1 +
 arch/x86/kernel/cpu/acrn.c            | 61 ++++++++++++++++++++++++++
 arch/x86/kernel/cpu/hypervisor.c      |  4 ++
 arch/x86/kernel/irq.c                 |  2 +-
 arch/x86/xen/Kconfig                  |  1 +
 drivers/hv/Kconfig                    |  1 +
 12 files changed, 184 insertions(+), 2 deletions(-)
 create mode 100644 arch/x86/include/asm/acrn.h
 create mode 100644 arch/x86/include/asm/acrn_hypercall.h
 create mode 100644 arch/x86/kernel/cpu/acrn.c