From: Dave Hansen <dave.hansen@intel.com>
To: Kiryl Shutsemau <kas@kernel.org>, Yan Zhao <yan.y.zhao@intel.com>
Cc: "Edgecombe, Rick P" <rick.p.edgecombe@intel.com>,
"Gao, Chao" <chao.gao@intel.com>,
"seanjc@google.com" <seanjc@google.com>,
"bp@alien8.de" <bp@alien8.de>,
"Annapurve, Vishal" <vannapurve@google.com>,
"Huang, Kai" <kai.huang@intel.com>,
"mingo@redhat.com" <mingo@redhat.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"dave.hansen@linux.intel.com" <dave.hansen@linux.intel.com>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
"linux-coco@lists.linux.dev" <linux-coco@lists.linux.dev>,
"Yamahata, Isaku" <isaku.yamahata@intel.com>,
"pbonzini@redhat.com" <pbonzini@redhat.com>,
"tglx@linutronix.de" <tglx@linutronix.de>,
"x86@kernel.org" <x86@kernel.org>
Subject: Re: [PATCH v3 00/16] TDX: Enable Dynamic PAMT
Date: Mon, 29 Sep 2025 09:22:48 -0700 [thread overview]
Message-ID: <0fc9a9ed-b0ba-45fc-8bd2-1bf24c14ab7f@intel.com> (raw)
In-Reply-To: <x5wtf2whjjofaxufloomkebek4wnaiyjnteguanpw3ijdaer6q@daize5ngmfcl>
On 9/29/25 04:17, Kiryl Shutsemau wrote:
>> Do you have any suggestions for a better approach?
>>
>> e.g., could the PAMT pages be allocated from a dedicated pool that ensures they
>> reside in different 2MB ranges from guest private pages and TD control pages?
> It can work: allocate 2M a time for PAMT and piecemeal it to TDX module
> as needed. But it means if 2M allocation is failed, TDX is not functional.
>
> Maybe just use a dedicated kmem_cache for PAMT allocations. Although, I
> am not sure if there's a way to specify to kmem_cache what pages to ask
> from page allocator.
That seems a bit obtuse rather than just respecting normal lock ordering
rules. No?
next prev parent reply other threads:[~2025-09-29 16:22 UTC|newest]
Thread overview: 97+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-09-18 23:22 [PATCH v3 00/16] TDX: Enable Dynamic PAMT Rick Edgecombe
2025-09-18 23:22 ` [PATCH v3 01/16] x86/tdx: Move all TDX error defines into <asm/shared/tdx_errno.h> Rick Edgecombe
2025-09-19 1:29 ` Huang, Kai
2025-09-25 23:23 ` Edgecombe, Rick P
2025-09-25 23:32 ` Huang, Kai
2025-09-23 5:49 ` Binbin Wu
2025-09-25 23:09 ` Edgecombe, Rick P
2025-09-26 5:36 ` Binbin Wu
2025-09-26 4:52 ` Xiaoyao Li
2025-09-26 19:53 ` Edgecombe, Rick P
2025-09-18 23:22 ` [PATCH v3 02/16] x86/tdx: Add helpers to check return status codes Rick Edgecombe
2025-09-19 1:26 ` Huang, Kai
2025-09-25 23:27 ` Edgecombe, Rick P
2025-09-23 6:19 ` Binbin Wu
2025-09-25 23:24 ` Edgecombe, Rick P
2025-09-26 6:32 ` Xiaoyao Li
2025-09-26 21:27 ` Edgecombe, Rick P
2025-09-18 23:22 ` [PATCH v3 03/16] x86/virt/tdx: Simplify tdmr_get_pamt_sz() Rick Edgecombe
2025-09-19 0:50 ` Huang, Kai
2025-09-19 19:26 ` Edgecombe, Rick P
2025-09-29 11:44 ` Xiaoyao Li
2025-09-29 17:47 ` Edgecombe, Rick P
2025-09-18 23:22 ` [PATCH v3 04/16] x86/virt/tdx: Allocate page bitmap for Dynamic PAMT Rick Edgecombe
2025-09-23 7:15 ` Binbin Wu
2025-09-25 23:28 ` Edgecombe, Rick P
2025-09-26 8:41 ` Xiaoyao Li
2025-09-26 21:57 ` Edgecombe, Rick P
2025-09-26 22:06 ` Dave Hansen
2025-10-06 19:34 ` Edgecombe, Rick P
2025-09-18 23:22 ` [PATCH v3 05/16] x86/virt/tdx: Allocate reference counters for PAMT memory Rick Edgecombe
2025-09-23 7:45 ` Binbin Wu
2025-09-29 17:41 ` Edgecombe, Rick P
2025-09-29 18:08 ` Dave Hansen
2025-09-30 1:04 ` Edgecombe, Rick P
2025-09-18 23:22 ` [PATCH v3 06/16] x86/virt/tdx: Improve PAMT refcounters allocation for sparse memory Rick Edgecombe
2025-09-19 7:25 ` Huang, Kai
2025-09-23 9:38 ` Binbin Wu
2025-09-24 6:50 ` Huang, Kai
2025-09-24 8:57 ` Binbin Wu
2025-10-01 0:32 ` Edgecombe, Rick P
2025-10-01 10:40 ` Huang, Kai
2025-10-01 19:00 ` Edgecombe, Rick P
2025-10-01 20:49 ` Huang, Kai
2025-10-15 1:35 ` Huang, Kai
2025-09-18 23:22 ` [PATCH v3 07/16] x86/virt/tdx: Add tdx_alloc/free_page() helpers Rick Edgecombe
2025-09-22 11:27 ` Huang, Kai
2025-09-26 22:41 ` Edgecombe, Rick P
2025-09-29 7:56 ` Yan Zhao
2025-09-29 17:19 ` Edgecombe, Rick P
2025-09-30 14:03 ` Xiaoyao Li
2025-09-30 17:38 ` Dave Hansen
2025-09-30 17:47 ` Edgecombe, Rick P
2025-09-30 15:25 ` Dave Hansen
2025-09-30 17:00 ` Edgecombe, Rick P
2025-09-18 23:22 ` [PATCH v3 08/16] x86/virt/tdx: Optimize " Rick Edgecombe
2025-09-19 9:39 ` Kiryl Shutsemau
2025-09-24 6:15 ` Binbin Wu
2025-09-18 23:22 ` [PATCH v3 09/16] KVM: TDX: Allocate PAMT memory for TD control structures Rick Edgecombe
2025-09-18 23:22 ` [PATCH v3 10/16] KVM: TDX: Allocate PAMT memory for vCPU " Rick Edgecombe
2025-09-18 23:22 ` [PATCH v3 11/16] KVM: TDX: Add x86 ops for external spt cache Rick Edgecombe
2025-09-19 9:44 ` Kiryl Shutsemau
2025-09-23 7:03 ` Yan Zhao
2025-09-26 22:10 ` Edgecombe, Rick P
2025-09-28 8:35 ` Yan Zhao
2025-09-24 7:58 ` Binbin Wu
2025-09-30 1:02 ` Yan Zhao
2025-09-30 17:54 ` Edgecombe, Rick P
2025-09-18 23:22 ` [PATCH v3 12/16] x86/virt/tdx: Add helpers to allow for pre-allocating pages Rick Edgecombe
2025-09-19 9:55 ` Kiryl Shutsemau
2025-10-01 19:48 ` Edgecombe, Rick P
2025-09-22 11:20 ` Huang, Kai
2025-09-26 23:47 ` Edgecombe, Rick P
2025-09-28 22:56 ` Huang, Kai
2025-09-29 12:10 ` Huang, Kai
2025-09-26 1:44 ` Yan Zhao
2025-09-26 22:05 ` Edgecombe, Rick P
2025-09-28 1:40 ` Yan Zhao
2025-09-26 15:19 ` Dave Hansen
2025-09-26 15:49 ` Edgecombe, Rick P
2025-09-18 23:22 ` [PATCH v3 13/16] KVM: TDX: Handle PAMT allocation in fault path Rick Edgecombe
2025-09-30 1:09 ` Yan Zhao
2025-09-30 18:11 ` Edgecombe, Rick P
2025-09-18 23:22 ` [PATCH v3 14/16] KVM: TDX: Reclaim PAMT memory Rick Edgecombe
2025-09-18 23:22 ` [PATCH v3 15/16] x86/virt/tdx: Enable Dynamic PAMT Rick Edgecombe
2025-09-18 23:22 ` [PATCH v3 16/16] Documentation/x86: Add documentation for TDX's " Rick Edgecombe
2025-09-26 2:28 ` [PATCH v3 00/16] TDX: Enable " Yan Zhao
2025-09-26 14:09 ` Dave Hansen
2025-09-26 16:02 ` Edgecombe, Rick P
2025-09-26 16:11 ` Dave Hansen
2025-09-26 19:00 ` Edgecombe, Rick P
2025-09-26 19:03 ` Dave Hansen
2025-09-26 19:52 ` Edgecombe, Rick P
2025-09-28 1:34 ` Yan Zhao
2025-09-29 11:17 ` Kiryl Shutsemau
2025-09-29 16:22 ` Dave Hansen [this message]
2025-09-29 16:58 ` Edgecombe, Rick P
2025-09-30 18:29 ` Edgecombe, Rick P
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