* Jarkko Sakkinen (jarkko.sakkinen@xxxxxx) wrote: > On Wed, Jul 07, 2021 at 01:35:40PM -0500, Brijesh Singh wrote: > > The memory integrity guarantees of SEV-SNP are enforced through a new > > structure called the Reverse Map Table (RMP). The RMP is a single data > > structure shared across the system that contains one entry for every 4K > > page of DRAM that may be used by SEV-SNP VMs. The goal of RMP is to > > track the owner of each page of memory. Pages of memory can be owned by > > the hypervisor, owned by a specific VM or owned by the AMD-SP. See APM2 > > section 15.36.3 for more detail on RMP. > > > > The RMP table is used to enforce access control to memory. The table itself > > is not directly writable by the software. New CPU instructions (RMPUPDATE, > > PVALIDATE, RMPADJUST) are used to manipulate the RMP entries. > > What's the point of throwing out a set of opcodes, if there's > no explanation what they do? TBF They are described in the public document section linked in the previous paragraph. Dave > BR, Jarkko > -- Dr. David Alan Gilbert / dgilbert@xxxxxxxxxx / Manchester, UK
