[PATCH 0/2] Expose VMFUNC to the nested hypervisor

[Bandan Das]

These patches expose eptp switching/vmfunc to the nested hypervisor. Testing with
kvm-unit-tests seems to work ok.

If the guest hypervisor enables vmfunc/eptp switching, a "shadow" eptp list
address page is written to the VMCS. Initially, it would be unpopulated which
would result in a vmexit with exit reason 59. This hooks to handle_vmfunc()
to rewrite vmcs12->ept_pointer to reload the mmu and get a new root hpa.
This new shadow ept pointer is written to the shadow eptp list in the given
index. A next vmfunc call to switch to the given index would succeed without
an exit.

Bandan Das (2):
  KVM: nVMX: Implement EPTP switching for the L1 hypervisor
  KVM: nVMX: Advertise VMFUNC to L1 hypervisor

 arch/x86/include/asm/vmx.h |   9 ++++
 arch/x86/kvm/vmx.c         | 122 +++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 131 insertions(+)

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2.9.4