KVM: nVMX: split pieces of prepare_vmcs02() to prepare_vmcs02_early()

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Add prepare_vmcs02_early() and move pieces of prepare_vmcs02() to the
new function.  prepare_vmcs02_early() writes the bits of vmcs02 that
a) must be in place to pass the VMFail consistency checks (assuming
vmcs12 is valid) and b) are needed recover from a VMExit, e.g. host
state that is loaded on VMExit.  Splitting the functionality will
enable KVM to leverage hardware to do VMFail consistency checks via
a dry run of VMEnter and recover from a potential VMExit without
having to fully initialize vmcs02.

Add prepare_vmcs02_constant_state() to handle writing vmcs02 state that
comes from vmcs01 and never changes, i.e. we don't need to rewrite any
of the vmcs02 that is effectively constant once defined.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Reviewed-by: Jim Mattson <jmattson@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Sean Christopherson 2018-09-26 09:23:50 -07:00 • committed by Paolo Bonzini

parent 860ff2aa84

commit 09abe32002

1 changed files with 224 additions and 186 deletions

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arch/x86/kvm/vmx.c

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