[RFC PATCH v3 0/4] x86: Add the support of ACRN guest under arch/x86

[Zhao Yakui <yakui.zhao@intel.com>]

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
understand.
        Remove the export of x86_hyper_acrn.
        Remove the unused API definition of acrn_setup_intr_handler and
acrn_remove_intr_handler.
        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

Zhao Yakui (4):
  x86: Add new config symbol to unify conditional definition of
    hv_irq_callback_count
  x86: Add the support of ACRN guest
  x86: Use HYPERVISOR_CALLBACK_VECTOR for acrn_guest upcall vector
  x86: Add hypercall for acrn_guest

 arch/x86/Kconfig                      | 12 +++++
 arch/x86/entry/entry_64.S             |  5 +++
 arch/x86/include/asm/acrn_hypercall.h | 82 +++++++++++++++++++++++++++++++++++
 arch/x86/include/asm/acrnhyper.h      | 19 ++++++++
 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            | 57 ++++++++++++++++++++++++
 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, 185 insertions(+), 2 deletions(-)
 create mode 100644 arch/x86/include/asm/acrn_hypercall.h
 create mode 100644 arch/x86/include/asm/acrnhyper.h
 create mode 100644 arch/x86/kernel/cpu/acrn.c

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2.7.4