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ccf447434e
Load RDX with the VMCS.HOST_RSP field encoding on-demand instead of delegating to the compiler via an input constraint. In addition to saving one whole MOV instruction, this allows RDX to be properly clobbered (in a future patch) instead of being saved/loaded to/from the stack. Despite nested_vmx_check_vmentry_hw() having similar code, leave it alone, for now. In that case, RDX is unconditionally used and isn't clobbered, i.e. sending in HOST_RSP as an input is simpler. Note that because HOST_RSP is an enum and not a define, it must be redefined as an immediate instead of using __stringify(HOST_RSP). The naming "conflict" between host_rsp and HOST_RSP is slightly confusing, but the former will be removed in a future patch, at which point HOST_RSP is absolutely what is desired. Reviewed-by: Jim Mattson <jmattson@google.com> Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> |
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