On Sat, 2021-08-28 at 00:03 +1200, Kai Huang wrote: > > > > -/* The free page list lock protected variables prepend the lock. */ > > > > +/* The number of usable EPC pages in the system. */ > > > > +unsigned long sgx_nr_all_pages; > > > > + > > > > +/* The number of free EPC pages in all nodes. */ > > > > static unsigned long sgx_nr_free_pages; > > > > > > > > /* Nodes with one or more EPC sections. */ > > > > @@ -656,6 +659,8 @@ static bool __init sgx_setup_epc_section(u64 phys_addr, u64 size, > > > > list_add_tail(§ion->pages[i].list, &sgx_dirty_page_list); > > > > } > > > > > > > > + sgx_nr_all_pages += nr_pages; > > > > + > > > > > > EPC sections can be freed again in sgx_init() after they are successfully > > > initialized, when any further initialization fails (i.e. when fails to create > > > ksgxd, or fails to register /dev/sgx_provision). In which case, I think > > > sgx_nr_all_pages should also be cleared. But current sgx_init() seems doesn't > > > reset it. Do you need to fix that too? > > > > sgx_nr_all_pages tells just the total pages in the system, i.e. it's a constant. > > > > Maybe a rename to "sgx_nr_total_pages" would be a good idea? Would match with > > the meminfo field better too. > > I don't have preference on name. I just think if there's no actual user of > EPC (when both driver and KVM SGX cannot be enabled), it's pointless to print > number of EPC pages. I'd presume that you refer to the code, which prints the number of *bytes* in the system because code printing the number of pages does not exist in this patch set. I have troubles the decipher your statement. You think that only if both the driver and KVM are *both* enabled, only then it makes sense to have this information available for sysadmin? I don't get this logic, if I understood what you mean in the first place. /Jarkko
