KVM: SVM: Add GHCB Accessor functions
Building a correct GHCB for the hypervisor requires setting valid bits in the GHCB. Simplify that process by providing accessor functions to set values and to update the valid bitmap and to check the valid bitmap in KVM. Signed-off-by: NJoerg Roedel <jroedel@suse.de> Signed-off-by: NBorislav Petkov <bp@suse.de> Link: https://lkml.kernel.org/r/20200907131613.12703-4-joro@8bytes.org
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