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When building the out-of-tree drivers with virtualization support disabled, symbols for some of the virtualization functions are not found ... nvgpu: Unknown symbol tegra_hv_mempool_unreserve (err -2) nvgpu: Unknown symbol is_tegra_hypervisor_mode (err -2) nvgpu: Unknown symbol tegra_hv_mempool_reserve (err -2) nvhost_pva: Unknown symbol is_tegra_hypervisor_mode (err -2) mc_utils: Unknown symbol is_tegra_hypervisor_mode (err -2) mc_utils: Unknown symbol is_tegra_hypervisor_mode (err -2) Update the hv-ivc.h header to ensure that these function stubs are defined when virtualization support is disabled and only build the hv-ivc driver if virtualization is enabled. Finally, move populating the ccflags to the top-level Makefile and use the subdir-ccflags directive to ensure the ccflags are passed to all sub-directories. Bug 4159372 Bug 4170085 Change-Id: I35edb91007524c3143dff7564f9ad545bd34e969 Signed-off-by: Jon Hunter <jonathanh@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/2921199 Tested-by: mobile promotions <svcmobile_promotions@nvidia.com> Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>