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Fri, 16 May 2025 08:21:45 +0000 Date: Fri, 16 May 2025 16:19:35 +0800 From: Yan Zhao To: "Edgecombe, Rick P" CC: "pbonzini@redhat.com" , "seanjc@google.com" , "Shutemov, Kirill" , "quic_eberman@quicinc.com" , "Li, Xiaoyao" , "kvm@vger.kernel.org" , "Hansen, Dave" , "david@redhat.com" , "thomas.lendacky@amd.com" , "tabba@google.com" , "Li, Zhiquan1" , "Du, Fan" , "linux-kernel@vger.kernel.org" , "michael.roth@amd.com" , "Weiny, Ira" , "vbabka@suse.cz" , "binbin.wu@linux.intel.com" , "ackerleytng@google.com" , "Yamahata, Isaku" , "Peng, Chao P" , "Annapurve, Vishal" , "jroedel@suse.de" , "Miao, Jun" , "pgonda@google.com" , "x86@kernel.org" Subject: Re: [RFC PATCH 19/21] KVM: gmem: Split huge boundary leafs for punch hole of private memory Message-ID: Reply-To: Yan Zhao References: <20250424030033.32635-1-yan.y.zhao@intel.com> <20250424030858.519-1-yan.y.zhao@intel.com> <5749b89695679d21542efea03035dc5a682fbbeb.camel@intel.com> Content-Type: text/plain; charset="iso-8859-1" Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <5749b89695679d21542efea03035dc5a682fbbeb.camel@intel.com> X-ClientProxiedBy: SI1PR02CA0033.apcprd02.prod.outlook.com (2603:1096:4:1f6::14) To DS7PR11MB5966.namprd11.prod.outlook.com (2603:10b6:8:71::6) Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS7PR11MB5966:EE_|SJ0PR11MB5865:EE_ X-MS-Office365-Filtering-Correlation-Id: d8213d25-f075-4b15-2425-08dd9452b1d1 X-LD-Processed: 46c98d88-e344-4ed4-8496-4ed7712e255d,ExtAddr X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|7416014|1800799024|376014; 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> >   struct kvm_memory_slot *slot; > >   struct kvm *kvm = gmem->kvm; > >   unsigned long index; > > + int ret = 0; > >   > >   xa_for_each_range(&gmem->bindings, index, slot, start, end - 1) { > >   pgoff_t pgoff = slot->gmem.pgoff; > > @@ -319,14 +320,23 @@ static void kvm_gmem_invalidate_begin(struct kvm_gmem *gmem, pgoff_t start, > >   kvm_mmu_invalidate_begin(kvm); > >   } > >   > > + if (need_split) { > > + ret = kvm_split_boundary_leafs(kvm, &gfn_range); > > What is the effect for other guestmemfd users? SEV doesn't need this, right? Oh > I see, down in tdp_mmu_split_boundary_leafs() it bails on non-mirror roots. I > don't like the naming then. It sounds deterministic, but it's really only > necessary splits for certain VM types. Right, kvm_split_boundary_leafs() only takes effect on the mirror root. > I guess it all depends on how well teaching kvm_mmu_unmap_gfn_range() to fail > goes. But otherwise, we should call it like kvm_prepare_zap_range() or Hmm, if we call it kvm_prepare_zap_range(), we have to invoke it for all zaps. However, except kvm_gmem_punch_hole(), the other two callers kvm_gmem_error_folio(), kvm_gmem_release() have no need to perfrom splitting before zapping. Passing in the invalidation reason to kvm_gmem_invalidate_begin() also makes things complicated. > something. And have it make it clearly do nothing for non-TDX high up where it's > easy to see. Would a name like kvm_split_boundary_leafs_for_mirror() be too TDX specific? If we name it kvm_split_boundary_leafs(), SEV can simply remove the bailing out if they want in future. > > > + if (ret < 0) > > + goto out; > > + > > + flush |= ret; > > + } > >   flush |= kvm_mmu_unmap_gfn_range(kvm, &gfn_range); > >   } > >   > > +out: > >   if (flush) > >   kvm_flush_remote_tlbs(kvm); > >   > >   if (found_memslot) > >   KVM_MMU_UNLOCK(kvm); > > + >