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A new machine specific option 'x-change-vmfd-on-reset' is introduced for debugging and testing only (hence the 'x-' prefix). This option when enabled will force KVM VM file descriptor to be changed upon guest reset like in the case of confidential guests. This can be used to exercise the code changes that are specific for confidential guests on non-confidential guests as well (except changes that require hardware support for confidential guests). A new functional test has been added in the next patch that uses this new parameter to test the VM file descriptor changes. Signed-off-by: Ani Sinha <anisinha@redhat.com> Link: https://lore.kernel.org/r/20260225035000.385950-33-anisinha@redhat.com Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>