From: Sean Christopherson <seanjc@google.com>
To: Yan Zhao <yan.y.zhao@intel.com>
Cc: pbonzini@redhat.com, linux-kernel@vger.kernel.org,
kvm@vger.kernel.org, x86@kernel.org, rick.p.edgecombe@intel.com,
dave.hansen@intel.com, kas@kernel.org, tabba@google.com,
ackerleytng@google.com, michael.roth@amd.com, david@kernel.org,
vannapurve@google.com, sagis@google.com, vbabka@suse.cz,
thomas.lendacky@amd.com, nik.borisov@suse.com,
pgonda@google.com, fan.du@intel.com, jun.miao@intel.com,
francescolavra.fl@gmail.com, jgross@suse.com,
ira.weiny@intel.com, isaku.yamahata@intel.com,
xiaoyao.li@intel.com, kai.huang@intel.com,
binbin.wu@linux.intel.com, chao.p.peng@intel.com,
chao.gao@intel.com
Subject: Re: [PATCH v3 06/24] KVM: x86/mmu: Disallow page merging (huge page adjustment) for mirror root
Date: Thu, 15 Jan 2026 14:49:59 -0800 [thread overview]
Message-ID: <aWlvF2rld0Nz3nRz@google.com> (raw)
In-Reply-To: <20260106102024.25023-1-yan.y.zhao@intel.com>
On Tue, Jan 06, 2026, Yan Zhao wrote:
> From: Rick P Edgecombe <rick.p.edgecombe@intel.com>
>
> Disallow page merging (huge page adjustment) for the mirror root by
> utilizing disallowed_hugepage_adjust().
Why? What is this actually doing? The below explains "how" but I'm baffled as
to the purpose. I'm guessing there are hints in the surrounding patches, but I
haven't read them in depth, and shouldn't need to in order to understand the
primary reason behind a change.
next prev parent reply other threads:[~2026-01-15 22:50 UTC|newest]
Thread overview: 127+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-06 10:16 [PATCH v3 00/24] KVM: TDX huge page support for private memory Yan Zhao
2026-01-06 10:18 ` [PATCH v3 01/24] x86/tdx: Enhance tdh_mem_page_aug() to support huge pages Yan Zhao
2026-01-06 21:08 ` Dave Hansen
2026-01-07 9:12 ` Yan Zhao
2026-01-07 16:39 ` Dave Hansen
2026-01-08 19:05 ` Ackerley Tng
2026-01-08 19:24 ` Dave Hansen
2026-01-09 16:21 ` Vishal Annapurve
2026-01-09 3:08 ` Yan Zhao
2026-01-09 18:29 ` Ackerley Tng
2026-01-12 2:41 ` Yan Zhao
2026-01-13 16:50 ` Vishal Annapurve
2026-01-14 1:48 ` Yan Zhao
2026-01-06 10:18 ` [PATCH v3 02/24] x86/virt/tdx: Add SEAMCALL wrapper tdh_mem_page_demote() Yan Zhao
2026-01-16 1:00 ` Huang, Kai
2026-01-16 8:35 ` Yan Zhao
2026-01-16 11:10 ` Huang, Kai
2026-01-16 11:22 ` Huang, Kai
2026-01-19 6:18 ` Yan Zhao
2026-01-19 6:15 ` Yan Zhao
2026-01-16 11:22 ` Huang, Kai
2026-01-19 5:55 ` Yan Zhao
2026-01-28 22:49 ` Sean Christopherson
2026-01-06 10:19 ` [PATCH v3 03/24] x86/tdx: Enhance tdh_phymem_page_wbinvd_hkid() to invalidate huge pages Yan Zhao
2026-01-06 10:19 ` [PATCH v3 04/24] x86/tdx: Introduce tdx_quirk_reset_folio() to reset private " Yan Zhao
2026-01-06 10:20 ` [PATCH v3 05/24] x86/virt/tdx: Enhance tdh_phymem_page_reclaim() to support " Yan Zhao
2026-01-06 10:20 ` [PATCH v3 06/24] KVM: x86/mmu: Disallow page merging (huge page adjustment) for mirror root Yan Zhao
2026-01-15 22:49 ` Sean Christopherson [this message]
2026-01-16 7:54 ` Yan Zhao
2026-01-26 16:08 ` Sean Christopherson
2026-01-27 3:40 ` Yan Zhao
2026-01-28 19:51 ` Sean Christopherson
2026-01-06 10:20 ` [PATCH v3 07/24] KVM: x86/tdp_mmu: Introduce split_external_spte() under write mmu_lock Yan Zhao
2026-01-28 22:38 ` Sean Christopherson
2026-01-06 10:20 ` [PATCH v3 08/24] KVM: TDX: Enable huge page splitting " Yan Zhao
2026-01-06 10:21 ` [PATCH v3 09/24] KVM: x86: Reject splitting huge pages under shared mmu_lock in TDX Yan Zhao
2026-01-06 10:21 ` [PATCH v3 10/24] KVM: x86/tdp_mmu: Alloc external_spt page for mirror page table splitting Yan Zhao
2026-01-06 10:21 ` [PATCH v3 11/24] KVM: x86/mmu: Introduce kvm_split_cross_boundary_leafs() Yan Zhao
2026-01-15 12:25 ` Huang, Kai
2026-01-16 23:39 ` Sean Christopherson
2026-01-19 1:28 ` Yan Zhao
2026-01-19 8:35 ` Huang, Kai
2026-01-19 8:49 ` Huang, Kai
2026-01-19 10:11 ` Yan Zhao
2026-01-19 10:40 ` Huang, Kai
2026-01-19 11:06 ` Yan Zhao
2026-01-19 12:32 ` Yan Zhao
2026-01-29 14:36 ` Sean Christopherson
2026-01-20 17:51 ` Sean Christopherson
2026-01-22 6:27 ` Yan Zhao
2026-01-20 17:57 ` Vishal Annapurve
2026-01-20 18:02 ` Sean Christopherson
2026-01-22 6:33 ` Yan Zhao
2026-01-29 14:51 ` Sean Christopherson
2026-01-06 10:21 ` [PATCH v3 12/24] KVM: x86: Introduce hugepage_set_guest_inhibit() Yan Zhao
2026-01-06 10:22 ` [PATCH v3 13/24] KVM: TDX: Honor the guest's accept level contained in an EPT violation Yan Zhao
2026-01-06 10:22 ` [PATCH v3 14/24] KVM: Change the return type of gfn_handler_t() from bool to int Yan Zhao
2026-01-16 0:21 ` Sean Christopherson
2026-01-16 6:42 ` Yan Zhao
2026-01-06 10:22 ` [PATCH v3 15/24] KVM: x86: Split cross-boundary mirror leafs for KVM_SET_MEMORY_ATTRIBUTES Yan Zhao
2026-01-06 10:22 ` [PATCH v3 16/24] KVM: guest_memfd: Split for punch hole and private-to-shared conversion Yan Zhao
2026-01-28 22:39 ` Sean Christopherson
2026-01-06 10:23 ` [PATCH v3 17/24] KVM: TDX: Get/Put DPAMT page pair only when mapping size is 4KB Yan Zhao
2026-01-06 10:23 ` [PATCH v3 18/24] x86/virt/tdx: Add loud warning when tdx_pamt_put() fails Yan Zhao
2026-01-06 10:23 ` [PATCH v3 19/24] KVM: x86: Introduce per-VM external cache for splitting Yan Zhao
2026-01-21 1:54 ` Huang, Kai
2026-01-21 17:30 ` Sean Christopherson
2026-01-21 19:39 ` Edgecombe, Rick P
2026-01-21 23:01 ` Huang, Kai
2026-01-22 7:03 ` Yan Zhao
2026-01-22 7:30 ` Huang, Kai
2026-01-22 7:49 ` Yan Zhao
2026-01-22 10:33 ` Huang, Kai
2026-01-06 10:23 ` [PATCH v3 20/24] KVM: TDX: Implement per-VM external cache for splitting in TDX Yan Zhao
2026-01-06 10:23 ` [PATCH v3 21/24] KVM: TDX: Add/Remove DPAMT pages for the new S-EPT page for splitting Yan Zhao
2026-01-06 10:24 ` [PATCH v3 22/24] x86/tdx: Add/Remove DPAMT pages for guest private memory to demote Yan Zhao
2026-01-19 10:52 ` Huang, Kai
2026-01-19 11:11 ` Yan Zhao
2026-01-06 10:24 ` [PATCH v3 23/24] x86/tdx: Pass guest memory's PFN info to demote for updating pamt_refcount Yan Zhao
2026-01-06 10:24 ` [PATCH v3 24/24] KVM: TDX: Turn on PG_LEVEL_2M Yan Zhao
2026-01-06 17:47 ` [PATCH v3 00/24] KVM: TDX huge page support for private memory Vishal Annapurve
2026-01-06 21:26 ` Ackerley Tng
2026-01-06 21:38 ` Sean Christopherson
2026-01-06 22:04 ` Ackerley Tng
2026-01-06 23:43 ` Sean Christopherson
2026-01-07 9:03 ` Yan Zhao
2026-01-08 20:11 ` Ackerley Tng
2026-01-09 9:18 ` Yan Zhao
2026-01-09 16:12 ` Vishal Annapurve
2026-01-09 17:16 ` Vishal Annapurve
2026-01-09 18:07 ` Ackerley Tng
2026-01-12 1:39 ` Yan Zhao
2026-01-12 2:12 ` Yan Zhao
2026-01-12 19:56 ` Ackerley Tng
2026-01-13 6:10 ` Yan Zhao
2026-01-13 16:40 ` Vishal Annapurve
2026-01-14 9:32 ` Yan Zhao
2026-01-07 19:22 ` Edgecombe, Rick P
2026-01-07 20:27 ` Sean Christopherson
2026-01-12 20:15 ` Ackerley Tng
2026-01-14 0:33 ` Yan Zhao
2026-01-14 1:24 ` Sean Christopherson
2026-01-14 9:23 ` Yan Zhao
2026-01-14 15:26 ` Sean Christopherson
2026-01-14 18:45 ` Ackerley Tng
2026-01-15 3:08 ` Yan Zhao
2026-01-15 18:13 ` Ackerley Tng
2026-01-14 18:56 ` Dave Hansen
2026-01-15 0:19 ` Sean Christopherson
2026-01-16 15:45 ` Edgecombe, Rick P
2026-01-16 16:31 ` Sean Christopherson
2026-01-16 16:58 ` Edgecombe, Rick P
2026-01-19 5:53 ` Yan Zhao
2026-01-30 15:32 ` Sean Christopherson
2026-02-03 9:18 ` Yan Zhao
2026-02-09 17:01 ` Sean Christopherson
2026-01-16 16:57 ` Dave Hansen
2026-01-16 17:14 ` Sean Christopherson
2026-01-16 17:45 ` Dave Hansen
2026-01-16 19:59 ` Sean Christopherson
2026-01-16 22:25 ` Dave Hansen
2026-01-15 1:41 ` Yan Zhao
2026-01-15 16:26 ` Sean Christopherson
2026-01-16 0:28 ` Sean Christopherson
2026-01-16 11:25 ` Yan Zhao
2026-01-16 14:46 ` Sean Christopherson
2026-01-19 1:25 ` Yan Zhao
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=aWlvF2rld0Nz3nRz@google.com \
--to=seanjc@google.com \
--cc=ackerleytng@google.com \
--cc=binbin.wu@linux.intel.com \
--cc=chao.gao@intel.com \
--cc=chao.p.peng@intel.com \
--cc=dave.hansen@intel.com \
--cc=david@kernel.org \
--cc=fan.du@intel.com \
--cc=francescolavra.fl@gmail.com \
--cc=ira.weiny@intel.com \
--cc=isaku.yamahata@intel.com \
--cc=jgross@suse.com \
--cc=jun.miao@intel.com \
--cc=kai.huang@intel.com \
--cc=kas@kernel.org \
--cc=kvm@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=michael.roth@amd.com \
--cc=nik.borisov@suse.com \
--cc=pbonzini@redhat.com \
--cc=pgonda@google.com \
--cc=rick.p.edgecombe@intel.com \
--cc=sagis@google.com \
--cc=tabba@google.com \
--cc=thomas.lendacky@amd.com \
--cc=vannapurve@google.com \
--cc=vbabka@suse.cz \
--cc=x86@kernel.org \
--cc=xiaoyao.li@intel.com \
--cc=yan.y.zhao@intel.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.