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(+) -- 2.9.4
