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Thu, 15 Oct 2026 09:50:35 +0000 Date: Thu, 15 Oct 2026 17:49:40 +0800 From: Yan Zhao To: "Edgecombe, Rick P" , "Du, Fan" , "kvm@vger.kernel.org" , "Huang, Kai" , "Li, Xiaoyao" , "Hansen, Dave" , "thomas.lendacky@amd.com" , "tabba@google.com" , "vbabka@suse.cz" , "david@kernel.org" , "kas@kernel.org" , "binbin.wu@linux.intel.com" , "seanjc@google.com" , "pbonzini@redhat.com" , "Peng, Chao P" , "ackerleytng@google.com" , "michael.roth@amd.com" , "nik.borisov@suse.com" , "linux-kernel@vger.kernel.org" , "sagis@google.com" , "Annapurve, Vishal" , "Chen, Farrah" , "Gao, Chao" , "francescolavra.fl@gmail.com" , "Miao, Jun" , "jgross@suse.com" , "pgonda@google.com" , "x86@kernel.org" Subject: Re: [PATCH v4 02/17] x86/virt/tdx: Add a SEAMCALL wrapper to demote a 2MB huge page Message-ID: Reply-To: Yan Zhao References: <20260928090729.15468-1-yan.y.zhao@intel.com> <20260928090831.15502-1-yan.y.zhao@intel.com> <9016c06a883bde489957ffdf7933cbbf6b8e6b03.camel@intel.com> <94e930e88046fca1f53d2234d581aae593367d95.camel@intel.com> Content-Type: text/plain; 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> > > > atomic_t *dpamt_refcount = tdx_find_dpamt_refcount(pfn); > Oh, when DPAMT is not enabled, this line makes it erroneous to access the > uninitialized dpamt_refcounts. > > > > > struct page *dpamt_pages[TDX_DPAMT_ENTRY_PAGE_CNT]; > > > > *ext_err1 = 0; > > > > *ext_err2 = 0; > > > > u64 ret; > > > > > > > > if (!tdx_supports_dynamic_pamt(&tdx_sysinfo)) > > > > return TDX_SW_ERROR; > > > > > > Do we need to handle this logically? The below will return some error in any > So, we need this check and should move tdx_find_dpamt_refcount() after it. > > Would the below version look good to you? > > Changes vs the version in > https://lore.kernel.org/all/as9OHnM4mceEre%2F2@yzhao56-desk.sh.intel.com: > - Added WARN_ON_ONCE() for tdx_supports_dynamic_pamt() and moved > tdx_find_dpamt_refcount() after checking DPAMT is enabled. > - Added WARN_ON_ONCE() for DEMOTE SEAMCALL failure. > - atomic_cmpxchg_release() to atomic_set() and added > WARN_ON_ONCE(atomic_read(dpamt_refcount)). > > (I didn't add the warning for alloc_pamt_array(). Will add it if you think the > justification in > https://lore.kernel.org/all/atBupzmYqvnB0Qcu@yzhao56-desk.sh.intel.com makes sense. > > > u64 tdh_mem_page_demote_2mb(struct tdx_td *td, u64 gpa, kvm_pfn_t pfn, struct page *new_sept_pt, > struct tdx_pamt_cache *pamt_cache, u64 *ext_err1, u64 *ext_err2) > { > struct tdx_module_args args = { > .rcx = gpa | pg_level_to_tdx_sept_level(PG_LEVEL_2M), > .rdx = tdx_tdr_pa(td), > .r8 = page_to_phys(new_sept_pt), > }; > struct page *dpamt_pages[TDX_DPAMT_ENTRY_PAGE_CNT]; > atomic_t *dpamt_refcount; > u64 ret; > > *ext_err1 = 0; > *ext_err2 = 0; > > if (WARN_ON_ONCE(!tdx_supports_dynamic_pamt(&tdx_sysinfo))) > return TDX_SW_ERROR; > > dpamt_refcount = tdx_find_dpamt_refcount(pfn); Can move this line after alloc_pamt_array() to mirror the sequence in tdx_pamt_get(). > ret = alloc_pamt_array(dpamt_pages, pamt_cache); > if (ret) > return TDX_SW_ERROR; return ret; > > args.r12 = page_to_phys(dpamt_pages[0]), > args.r13 = page_to_phys(dpamt_pages[1]), > > /* > * The dpamt_lock is used to avoid contention between the > * TDH_MEM_PAGE_DEMOTE and TDH_PHYMEM_PAMT_{ADD/REMOVE} SEAMCALLs. > */ > spin_lock(&dpamt_lock); > > WARN_ON_ONCE(atomic_read(dpamt_refcount)); > > ret = seamcall_saved_ret(TDH_MEM_PAGE_DEMOTE, &args); > > *ext_err1 = args.rcx; > *ext_err2 = args.rdx; > > if (WARN_ON_ONCE(ret != TDX_SUCCESS)) > goto out_free; > > atomic_set(dpamt_refcount, PTRS_PER_PMD); > spin_unlock(&dpamt_lock); > > return TDX_SUCCESS; > > out_free: > spin_unlock(&dpamt_lock); > reinsert_pamt_array(pamt_cache, dpamt_pages); > > return ret; > } > EXPORT_SYMBOL_FOR_KVM(tdh_mem_page_demote_2mb); >