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Wed, 27 Aug 2025 09:22:50 +0000 Date: Wed, 27 Aug 2025 17:22:02 +0800 From: Yan Zhao To: Sean Christopherson CC: Paolo Bonzini , , , Michael Roth , "Ira Weiny" , Vishal Annapurve , "Rick Edgecombe" Subject: Re: [RFC PATCH 12/12] KVM: TDX: Rename nr_premapped to nr_pending_tdh_mem_page_adds Message-ID: Reply-To: Yan Zhao References: <20250827000522.4022426-1-seanjc@google.com> <20250827000522.4022426-13-seanjc@google.com> Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <20250827000522.4022426-13-seanjc@google.com> X-ClientProxiedBy: SI2PR01CA0041.apcprd01.prod.exchangelabs.com (2603:1096:4:193::15) To DS7PR11MB5966.namprd11.prod.outlook.com (2603:10b6:8:71::6) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS7PR11MB5966:EE_|IA4PR11MB9277:EE_ X-MS-Office365-Filtering-Correlation-Id: 7fb8380f-d2b4-455d-b07a-08dde54b4b77 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|1800799024|376014|366016|7053199007; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?EQDIOd425exjJxpqpzYPpqeESvcs/Rcbhqt2XGgLSzTdHtcC1o86B9i3R4jc?= =?us-ascii?Q?kTxEqWJZTSG1+QkWWitOjfMQ/fBHX9aTyELdFKThb1IpkL/mfV4tPDw/Bocx?= =?us-ascii?Q?zgb9LC4y5rnaOK0z0nieZcb6r2ru8e5alGY36EpMZ7AuhIu8o5a6cqHbZrQB?= =?us-ascii?Q?CBqLmd/SLVqITngJZGEkQVTdqyHYtaFYdAeSuoQCgDzQUn+6vNXUUYVOzGsz?= =?us-ascii?Q?twM1oB2CJiubrFGWqBPcafRgsLUB6aduO3u12c2UklBOm84u8fHPguVu4Lze?= =?us-ascii?Q?dMh3iP4b1EyMxCH0+e7oFdU/2xX6XCOTzCN41Z9E6ojHkcfpCJ3tlfEKGfPp?= =?us-ascii?Q?K4mY8NfeVGxzDqUOQvu6tbZmGptkCpkRBHP1cDe1bqasKqj+Ih14IhZOvN6K?= =?us-ascii?Q?WmewMsVs8m74AMoqle91DgOJqxuJpZ9marwvB1KTX269sSkL+3PxO6aWQhCx?= =?us-ascii?Q?UTKbRw1McJFPwqMZzR3QkxWvVsXjYbRsmwSZeqMs9yEZ+9ezVhPgqS6EA7h5?= =?us-ascii?Q?BjYa/kMhE5H+b0EuMnmVquu6mvihmmMMVQ1X+hi5kqaW9G9eJnGsGuuH6J62?= =?us-ascii?Q?8JqWguAfPiIHNwaAb6dWbge3TDp/szzJu5LVI9N+KDmxLml6niEoVN+7VlE+?= =?us-ascii?Q?AUwRXz1HQfCQ35UvBE92iwhLySoxwXxL3kdf2HhSTegfcQY0jllYwf+B9ffs?= =?us-ascii?Q?U+uH5JeOrRV+ivFTrCpEzyb5HypNqKQ9ro9A7YVuFI1PfFf2YFeO22snUZAD?= =?us-ascii?Q?TmByuYS3hdLXy5YeIeJx+DLLnGqdlC8S80ew7W4ZDQVQWcIHPeY7MgTgj4aQ?= =?us-ascii?Q?7OZcQPsO8DRERywMdCpK88Kv/p+9Ap7KIGyX1MYBrSYV2MrfmnXOQiny8Nll?= =?us-ascii?Q?1CNgpBReq8/zvHM/4b9OQ1wToa7RuIdOsQusOBjyD4u1Iq+bSAM2T1CFCmN0?= =?us-ascii?Q?N/t8IzL+JBEVmp+Ewk4eiroXtsHkzJbFCjuu7X6bq6FKe1frbpgdQ6jGwpRN?= =?us-ascii?Q?yMlJTmvwgIZhoALuHmFBK4K85Yrq5bhEWLAF0gqB0bGut78x1LAntXAKCLH6?= =?us-ascii?Q?hK6vINnxfz5B/8APRDjpxxE47kwq6xLnUvSDzVS6TuNsrQpbFVx9Neec656o?= =?us-ascii?Q?IR6TXgICBuBCeETnM9tYltyA2lEqkckfTbJY+YEq9o7qmoAVqyyx68avSTwr?= =?us-ascii?Q?mwLbVl1Otazx1tN7GpmuSfP5BsEtiU3AyMakAfMeZCe+INA/nvOK+0yJYUMv?= =?us-ascii?Q?GliSlYB3AIW9KzNmnlJYN16NQZqzEEf0ea3X4codkrOuvYtwUyYje4EvxVyI?= =?us-ascii?Q?Kbw+OR9KLrjH0rq1qKj1R/NrY9xOfbrSWmX5yovUdCsYpqtEpuiST+CNmLbe?= =?us-ascii?Q?ufVK13EyiOVJWu2Tweb3SZxXeG4YbxoS1OFT2I0YwEaQMDwNAOIgm4ojJDAd?= =?us-ascii?Q?j/mBOuejsjjHScS/D9dP9rK0SIw5I5cR8mIwl0gNAUn8+W3hHk37NLDjCFCZ?= =?us-ascii?Q?qAr/Quu7HSEgDZY9Akreumt67BVKA72PdUg6NBv3bxi2yPaoqBiMKMvAysE5?= =?us-ascii?Q?xkK5nbRHeGNjNuV3m/pkDlERYa1hf+a+YcCz+wFu?= X-MS-Exchange-CrossTenant-Network-Message-Id: 7fb8380f-d2b4-455d-b07a-08dde54b4b77 X-MS-Exchange-CrossTenant-AuthSource: DS7PR11MB5966.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 27 Aug 2025 09:22:50.9186 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: IrceHS8j9If33+dzHa8/CBos3NRU86WbhwVFefOgGFJLK/EQs9WrM6wSk6uKzi64XnAeKZhI6dwULJ+Z5/DGVw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA4PR11MB9277 X-OriginatorOrg: intel.com On Tue, Aug 26, 2025 at 05:05:22PM -0700, Sean Christopherson wrote: > Rename "nr_premapped" to an asurdly verbose "nr_pending_tdh_mem_page_adds" > to make it explicitly clear what the counter tracks. "pre-map" is far > too similar to "pre-fault", especially since tdx_sept_set_private_spte() > deals with both "pre_fault_allowed" and the counter. > > No functional change intended. > > Signed-off-by: Sean Christopherson > --- > arch/x86/kvm/vmx/tdx.c | 8 ++++---- > arch/x86/kvm/vmx/tdx.h | 9 +++++++-- > 2 files changed, 11 insertions(+), 6 deletions(-) > > diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c > index 5d2bb27f22da..f9ac590e8ff0 100644 > --- a/arch/x86/kvm/vmx/tdx.c > +++ b/arch/x86/kvm/vmx/tdx.c > @@ -1639,7 +1639,7 @@ static int tdx_sept_set_private_spte(struct kvm *kvm, gfn_t gfn, > if (KVM_BUG_ON(kvm->arch.pre_fault_allowed, kvm)) > return -EIO; > > - kvm_tdx->nr_premapped++; > + kvm_tdx->nr_pending_tdh_mem_page_adds++; > return 0; > } > > @@ -1771,7 +1771,7 @@ static int tdx_sept_zap_private_spte(struct kvm *kvm, gfn_t gfn, > if (tdx_is_sept_zap_err_due_to_premap(kvm_tdx, err, entry, level)) { > lockdep_assert_held(&kvm->slots_lock); > > - if (KVM_BUG_ON(--kvm_tdx->nr_premapped < 0, kvm)) > + if (KVM_BUG_ON(--kvm_tdx->nr_pending_tdh_mem_page_adds < 0, kvm)) > return -EIO; > > return 0; > @@ -2846,7 +2846,7 @@ static int tdx_td_finalize(struct kvm *kvm, struct kvm_tdx_cmd *cmd) > * Pages are pending for KVM_TDX_INIT_MEM_REGION to issue > * TDH.MEM.PAGE.ADD(). > */ > - if (kvm_tdx->nr_premapped) > + if (kvm_tdx->nr_pending_tdh_mem_page_adds) > return -EINVAL; > > cmd->hw_error = tdh_mr_finalize(&kvm_tdx->td); > @@ -3160,7 +3160,7 @@ static int tdx_gmem_post_populate(struct kvm *kvm, gfn_t gfn, kvm_pfn_t pfn, > goto out; > } > > - KVM_BUG_ON(--kvm_tdx->nr_premapped < 0, kvm); > + KVM_BUG_ON(--kvm_tdx->nr_pending_tdh_mem_page_adds < 0, kvm); > > if (arg->flags & KVM_TDX_MEASURE_MEMORY_REGION) { > for (i = 0; i < PAGE_SIZE; i += TDX_EXTENDMR_CHUNKSIZE) { > diff --git a/arch/x86/kvm/vmx/tdx.h b/arch/x86/kvm/vmx/tdx.h > index 04ba9ea3e0ba..45d86f9fa41c 100644 > --- a/arch/x86/kvm/vmx/tdx.h > +++ b/arch/x86/kvm/vmx/tdx.h > @@ -36,8 +36,13 @@ struct kvm_tdx { > > struct tdx_td td; > > - /* For KVM_TDX_INIT_MEM_REGION. */ > - unsigned long nr_premapped; > + /* > + * The number of pages that KVM_TDX_INIT_MEM_REGION has mapped into the > + * S-EPT, but not yet initialized via TDH.MEM.PAGE_ADD. Used to sanity > + * check adding pages to the image, and to ensure that all pages have > + * been initialized before finalizing the TD. > + */ To ensure the consistency between mirror EPT and S-EPT? (as in https://lore.kernel.org/all/aK7Ji3kAoDaEYn3h@yzhao56-desk.sh.intel.com). tdx_td_finalize() holds slots_lock, so it can't run in-between a KVM_TDX_INIT_MEM_REGION. > + unsigned long nr_pending_tdh_mem_page_adds; > > /* > * Prevent vCPUs from TD entry to ensure SEPT zap related SEAMCALLs do > -- > 2.51.0.268.g9569e192d0-goog >