Shuo A Liu 10ec896f99 hv: nested: Introduce shadow EPT infrastructure ... To shadow guest EPT, the hypervisor needs construct a shadow EPT for each guest EPT. The key to associate a shadow EPT and a guest EPT is the EPTP (EPT pointer). This patch provides following structure to do the association. struct nept_desc { /* * A shadow EPTP. * The format is same with 'EPT pointer' in VMCS. * Its PML4 address field is a HVA of the hypervisor. */ uint64_t shadow_eptp; /* * An guest EPTP configured by L1 VM. * The format is same with 'EPT pointer' in VMCS. * Its PML4 address field is a GPA of the L1 VM. */ uint64_t guest_eptp; uint32_t ref_count; }; Due to lack of dynamic memory allocation of the hypervisor, a array nept_bucket of type 'struct nept_desc' is introduced to store those association information. A guest EPT might be shared between different L2 vCPUs, so this patch provides several functions to handle the reference of the structure. Interface get_shadow_eptp() also is introduced. To find the shadow EPTP of a specified guest EPTP. Tracked-On: #5923 Signed-off-by: Sainath Grandhi <sainath.grandhi@intel.com> Signed-off-by: Zide Chen <zide.chen@intel.com> Signed-off-by: Shuo A Liu <shuo.a.liu@intel.com> Reviewed-by: Jason Chen CJ <jason.cj.chen@intel.com> Acked-by: Eddie Dong <eddie.dong@intel.com>		2021-06-04 13:53:47 +08:00
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x86	hv: nested: Introduce shadow EPT infrastructure	2021-06-04 13:53:47 +08:00