From: Dave Hansen <dave.hansen@intel.com>
To: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
Zhi Wang <zhiw@nvidia.com>
Cc: pbonzini@redhat.com, seanjc@google.com,
rick.p.edgecombe@intel.com, isaku.yamahata@intel.com,
kai.huang@intel.com, yan.y.zhao@intel.com, tglx@linutronix.de,
mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com,
kvm@vger.kernel.org, x86@kernel.org, linux-coco@lists.linux.dev,
linux-kernel@vger.kernel.org
Subject: Re: [RFC, PATCH 00/12] TDX: Enable Dynamic PAMT
Date: Thu, 15 May 2025 07:03:32 -0700 [thread overview]
Message-ID: <2a3b9f44-6509-48b5-9453-9f4faba752a4@intel.com> (raw)
In-Reply-To: <pvcetnkt2qvxikcneh2ojszrytwenmagvjc33swd3q23hcftf4@nxqi73f57w6b>
On 5/15/25 02:17, Kirill A. Shutemov wrote:
> I don't think we can justify any batching here.
The is one primary goal here:
Reduce TDX overhead when not running TDX guests.
It has the side-effect of being _able_ to reduce the amount of memory
that TDX guests use when using >=2M pages only. It has the theoretical
capability to do the same for 4k users but only when the pages are quite
contiguous.
Right?
The "not running TDX guest" and ">=2M pages" benefits are relatively
easy. The 4k one is hard and is going to take a lot more work.
Could we please focus on the easy one for now and not get distracted by
the hard one that might not even be worth it in the end?
prev parent reply other threads:[~2025-05-15 14:03 UTC|newest]
Thread overview: 63+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-05-02 13:08 [RFC, PATCH 00/12] TDX: Enable Dynamic PAMT Kirill A. Shutemov
2025-05-02 13:08 ` [RFC, PATCH 01/12] x86/virt/tdx: Allocate page bitmap for " Kirill A. Shutemov
2025-05-05 10:08 ` Huang, Kai
2025-05-02 13:08 ` [RFC, PATCH 02/12] x86/virt/tdx: Allocate reference counters for PAMT memory Kirill A. Shutemov
2025-05-05 11:05 ` Huang, Kai
2025-05-08 13:03 ` kirill.shutemov
2025-05-09 1:06 ` Huang, Kai
2025-05-12 9:53 ` kirill.shutemov
2025-05-13 23:24 ` Huang, Kai
2025-05-09 9:52 ` Chao Gao
2025-05-12 9:51 ` Kirill A. Shutemov
2025-05-02 13:08 ` [RFC, PATCH 03/12] x86/virt/tdx: Add wrappers for TDH.PHYMEM.PAMT.ADD/REMOVE Kirill A. Shutemov
2025-05-09 10:18 ` Chao Gao
2025-05-12 9:55 ` Kirill A. Shutemov
2025-05-02 13:08 ` [RFC, PATCH 04/12] x86/virt/tdx: Account PAMT memory and print if in /proc/meminfo Kirill A. Shutemov
2025-05-02 13:08 ` [RFC, PATCH 05/12] KVM: TDX: Add tdx_pamt_get()/put() helpers Kirill A. Shutemov
2025-05-05 12:44 ` Huang, Kai
2025-05-07 1:01 ` Yan Zhao
2025-05-07 1:15 ` Vishal Annapurve
2025-05-07 2:42 ` Yan Zhao
2025-05-08 13:19 ` kirill.shutemov
2025-05-07 16:31 ` Dave Hansen
2025-05-08 2:08 ` Yan Zhao
2025-05-08 13:21 ` kirill.shutemov
2025-05-08 13:16 ` kirill.shutemov
2025-05-23 9:42 ` kirill.shutemov
2025-05-14 5:25 ` Chao Gao
2025-05-23 10:46 ` Kirill A. Shutemov
2025-05-14 5:33 ` Chao Gao
2025-05-14 6:25 ` Kirill A. Shutemov
2025-05-02 13:08 ` [RFC, PATCH 06/12] KVM: TDX: Allocate PAMT memory in __tdx_td_init() Kirill A. Shutemov
2025-05-05 12:46 ` Huang, Kai
2025-05-02 13:08 ` [RFC, PATCH 07/12] KVM: TDX: Allocate PAMT memory in tdx_td_vcpu_init() Kirill A. Shutemov
2025-05-02 13:08 ` [RFC, PATCH 08/12] KVM: x86/tdp_mmu: Add phys_prepare() and phys_cleanup() to kvm_x86_ops Kirill A. Shutemov
2025-05-06 11:55 ` Yan Zhao
2025-05-08 13:23 ` Kirill A. Shutemov
2025-05-09 1:25 ` Yan Zhao
2025-05-12 9:55 ` Kirill A. Shutemov
2025-05-14 0:00 ` Huang, Kai
2025-05-14 6:43 ` kirill.shutemov
2025-05-19 5:00 ` Huang, Kai
2025-05-23 12:00 ` kirill.shutemov
2025-06-05 13:01 ` kirill.shutemov
2025-06-05 22:21 ` Huang, Kai
2025-06-06 10:20 ` kirill.shutemov
2025-05-14 6:15 ` Chao Gao
2025-05-02 13:08 ` [RFC, PATCH 09/12] KVM: TDX: Preallocate PAMT pages to be used in page fault path Kirill A. Shutemov
2025-05-14 0:07 ` Huang, Kai
2025-05-14 6:30 ` Chao Gao
2025-05-30 10:28 ` Kirill A. Shutemov
2025-05-02 13:08 ` [RFC, PATCH 10/12] KVM: TDX: Hookup phys_prepare() and phys_cleanup() kvm_x86_ops Kirill A. Shutemov
2025-05-02 13:08 ` [RFC, PATCH 11/12] KVM: TDX: Reclaim PAMT memory Kirill A. Shutemov
2025-05-14 1:11 ` Huang, Kai
2025-05-14 15:21 ` Vishal Annapurve
2025-05-19 5:06 ` Huang, Kai
2025-05-02 13:08 ` [RFC, PATCH 12/12] x86/virt/tdx: Enable Dynamic PAMT Kirill A. Shutemov
2025-05-14 13:41 ` [RFC, PATCH 00/12] TDX: " Sean Christopherson
2025-05-15 14:22 ` Kirill A. Shutemov
2025-05-15 15:03 ` Dave Hansen
2025-05-15 16:02 ` Kirill A. Shutemov
2025-05-14 20:33 ` Zhi Wang
2025-05-15 9:17 ` Kirill A. Shutemov
2025-05-15 14:03 ` Dave Hansen [this message]
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