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Tue, 28 Oct 2025 05:39:11 +0000 Date: Tue, 28 Oct 2025 13:37:11 +0800 From: Yan Zhao To: Rick Edgecombe CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: Re: [PATCH] KVM: TDX: Take MMU lock around tdh_vp_init() Message-ID: Reply-To: Yan Zhao References: <20251028002824.1470939-1-rick.p.edgecombe@intel.com> Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <20251028002824.1470939-1-rick.p.edgecombe@intel.com> X-ClientProxiedBy: SI2P153CA0022.APCP153.PROD.OUTLOOK.COM (2603:1096:4:190::8) To DS7PR11MB5966.namprd11.prod.outlook.com (2603:10b6:8:71::6) Precedence: bulk X-Mailing-List: linux-coco@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS7PR11MB5966:EE_|DM3PPF0644BB20C:EE_ X-MS-Office365-Filtering-Correlation-Id: 672f7153-663e-45d3-a8c3-08de15e45266 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|7416014|366016; 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Dealing with > an error in some of the MMU paths that make SEAMCALLs is not straight > forward, so KVM takes steps to ensure that these will meet no contention > during a single BUSY error retry. The whole scheme relies on KVM to take > appropriate steps to avoid making any SEAMCALLs that could contend while > the retry is happening. > > Unfortunately, there is a case where contention could be met if userspace > does something unusual. Specifically, hole punching a gmem fd while > initializing the TD vCPU. The impact would be triggering a KVM_BUG_ON(). > > The resource being contended is called the "TDR resource" in TDX docs > parlance. The tdh_vp_init() can take this resource as exclusive if the > 'version' passed is 1, which happens to be version the kernel passes. The > various MMU operations (tdh_mem_range_block(), tdh_mem_track() and > tdh_mem_page_remove()) take it as shared. > > There isn't a KVM lock that maps conceptually and in a lock order friendly > way to the TDR lock. So to minimize infrastructure, just take MMU lock > around tdh_vp_init(). This makes the operations we care about mutually > exclusive. Since the other operations are under a write mmu_lock, the code > could just take the lock for read, however this is weirdly inverted from > the actual underlying resource being contended. Since this is covering an > edge case that shouldn't be hit in normal usage, be a little less weird > and take the mmu_lock for write around the call. > > Fixes: 02ab57707bdb ("KVM: TDX: Implement hooks to propagate changes of TDP MMU mirror page table") > Reported-by: Yan Zhao > Suggested-by: Yan Zhao > Signed-off-by: Rick Edgecombe > --- > Hi, > > It was indeed awkward, as Sean must have sniffed. But seems ok enough to > close the issue. > > Yan, can you give it a look? It passed my local tests. LGTM. Thanks! > Posted here, but applies on top of this series. > > Thanks, > > Rick > --- > arch/x86/kvm/vmx/tdx.c | 15 ++++++++++++--- > 1 file changed, 12 insertions(+), 3 deletions(-) > > diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c > index daec88d4b88d..8bf5d2624152 100644 > --- a/arch/x86/kvm/vmx/tdx.c > +++ b/arch/x86/kvm/vmx/tdx.c > @@ -2938,9 +2938,18 @@ static int tdx_td_vcpu_init(struct kvm_vcpu *vcpu, u64 vcpu_rcx) > } > } > > - err = tdh_vp_init(&tdx->vp, vcpu_rcx, vcpu->vcpu_id); > - if (TDX_BUG_ON(err, TDH_VP_INIT, vcpu->kvm)) > - return -EIO; > + /* > + * tdh_vp_init() can take a exclusive lock of the TDR resource inside > + * the TDX module. This resource is also taken as shared in several > + * no-fail MMU paths, which could return TDX_OPERAND_BUSY on contention. > + * A read lock here would be enough to exclude the contention, but take > + * a write lock to avoid the weird inversion. > + */ > + scoped_guard(write_lock, &vcpu->kvm->mmu_lock) { > + err = tdh_vp_init(&tdx->vp, vcpu_rcx, vcpu->vcpu_id); > + if (TDX_BUG_ON(err, TDH_VP_INIT, vcpu->kvm)) > + return -EIO; > + } > > vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE; > > -- > 2.51.1 >