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When building NVGPU with virtualization enabled, we need to ensure that the ccflag CONFIG_TEGRA_VIRTUALIZATION is defined. The Tegra HV driver is only compiled when CONFIG_TEGRA_VIRTUALIZATION is defined. When NVGPU is compiled without defining CONFIG_TEGRA_VIRTUALIZATION, then function stubs in the header file "soc/tegra/virt/hv-ivc.h" will be used and these stubs will return an error when called causing virtualization to fail. Bug 4159372 Bug 4170085 Change-Id: Iab3cd47e25e086e31f8cc3337c0a732645ed4a7a Signed-off-by: Jon Hunter <jonathanh@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2930315 (cherry picked from commit 6aa1600cb5b4b6ea783188c6d9e4cc56eedc17ea) Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2931658 Reviewed-by: Laxman Dewangan <ldewangan@nvidia.com> GVS: Gerrit_Virtual_Submit <buildbot_gerritrpt@nvidia.com>