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Mon, 19 Jan 2026 11:14:10 +0000 Date: Mon, 19 Jan 2026 19:11:53 +0800 From: Yan Zhao To: "Huang, Kai" CC: "pbonzini@redhat.com" , "seanjc@google.com" , "kvm@vger.kernel.org" , "Du, Fan" , "Li, Xiaoyao" , "Gao, Chao" , "Hansen, Dave" , "thomas.lendacky@amd.com" , "vbabka@suse.cz" , "tabba@google.com" , "david@kernel.org" , "kas@kernel.org" , "michael.roth@amd.com" , "Weiny, Ira" , "linux-kernel@vger.kernel.org" , "binbin.wu@linux.intel.com" , "ackerleytng@google.com" , "nik.borisov@suse.com" , "Yamahata, Isaku" , "Peng, Chao P" , "francescolavra.fl@gmail.com" , "sagis@google.com" , "Annapurve, Vishal" , "Edgecombe, Rick P" , "Miao, Jun" , "jgross@suse.com" , "pgonda@google.com" , "x86@kernel.org" Subject: Re: [PATCH v3 22/24] x86/tdx: Add/Remove DPAMT pages for guest private memory to demote Message-ID: Reply-To: Yan Zhao References: <20260106101646.24809-1-yan.y.zhao@intel.com> <20260106102413.25294-1-yan.y.zhao@intel.com> <2b9d6a33629b40c92ecf1d9ed5d75e2158528721.camel@intel.com> Content-Type: text/plain; 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> > The spec of TDH.MEM.PAGE.DEMOTE says: > > If the TDX Module is configured to use Dynamic PAMT and the large page > level is 1 (2MB), R12 contains the host physical address of a new  > PAMT page (HKID bits must be 0). > > It says "... is configured to use Dynamic PAMT ...", but not ".. Dynamic > PAMT is supported ..". Good catch. > tdx_supports_dynamic_pamt() only reports whether the module "supports" > DPAMT. Although in the DPAMT series the kernel always enables DPAMT when > it is supported, I think it's better to have a comment point out this fact > so we don't need to go to that series to figure out. Will add the comment. Thanks! > > + u64 guest_memory_pamt_page[MAX_TDX_ARG_SIZE(r12)]; > > + struct tdx_module_array_args args = { > > + .args.rcx = gpa | level, > > + .args.rdx = tdx_tdr_pa(td), > > + .args.r8 = page_to_phys(new_sept_page), > >   }; > >   u64 ret; > >   > >   if (!tdx_supports_demote_nointerrupt(&tdx_sysinfo)) > >   return TDX_SW_ERROR; > >   > > + if (dpamt) { > > + u64 *args_array = dpamt_args_array_ptr_r12(&args); > > + > > + if (alloc_pamt_array(guest_memory_pamt_page, prealloc)) > > + return TDX_SW_ERROR; > > + > > + /* > > + * Copy PAMT page PAs of the guest memory into the struct per the > > + * TDX ABI > > + */ > > + memcpy(args_array, guest_memory_pamt_page, > > +        tdx_dpamt_entry_pages() * sizeof(*args_array)); > > + }