From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pf1-f201.google.com (mail-pf1-f201.google.com [209.85.210.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7B58E36E48D for ; Mon, 6 Jul 2026 23:47:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783381625; cv=none; b=bjw0oERDDqcmzbrkyPrHUarVG5BIbg1hFjz4Z1eDoL7P4lT1ybf5mGVuRikLUBjLYlqw1wT4CSSjuO/m7FY+AboeJfx7nRGXthnuIr9m/UsRzXYCoghOCmnjKWTL2qFeXOvpY00S13dra8s82b2aUKBpA2nV/k6UB2bSNmeOsE0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783381625; c=relaxed/simple; bh=ZxoPu5hPF9Q2EClBSvzF/FJl98QidLmf5mhGdS5i5dM=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=E6oRKKjawrER1eYh8USrPldZMGbPeGja2lKv4v/lyfDc6DvgR1SkMxo1iLPC89wfmOFXLdn6GR8zV6Jr56cC6ajhsPFKWPRJOv+iQzFuIZNLhTBdNI0qB2+hkb97A/fiF2wLObxDZy+SUAAXft5uUZ7SnOu61jpTlQckwdvBPZ4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--seanjc.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=tBnWcfR/; arc=none smtp.client-ip=209.85.210.201 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--seanjc.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="tBnWcfR/" Received: by mail-pf1-f201.google.com with SMTP id d2e1a72fcca58-847ac21582cso3843171b3a.2 for ; Mon, 06 Jul 2026 16:47:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1783381624; x=1783986424; darn=lists.linux.dev; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=qWQdcsO2ad3MOocum1PCeCurOaAogfBMApPITrnBlDo=; b=tBnWcfR/wI23dLVa6ZZ1xtWMF7TUcn6ZQcho6JAv9I0RWfLnV6IzVLb9CvSp7vTthP ZFhFoiEzfUZ2pGSDjwp/trUz9DxYbd/0+AZOywLWpfo7nwKgmU3kFQQUx5xDl3r8J7Gv XxLLAnKhv5ej4Gg1mJNwQOd2pb0ZvQYuzkJv3DFDgTWEmelZeUC6fXpkQlzRo8E75lBO k7MlJcJY+urt3we5JEBsRoP3GzeuvWB7Tpm6Ujy9ZAUMiIRKu3hg8NXimXA4uoLJYF78 UeXJyn7HRNv0EiDStROcLK1BLp2r9w2PihscQpfSY2ogQSNqzYxR9UzyJIYEsjvLCcjR asxA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1783381624; x=1783986424; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=qWQdcsO2ad3MOocum1PCeCurOaAogfBMApPITrnBlDo=; b=JQuplNrJMvRuGdYNmkqnga0wL/SohCuBg+ciEqqFxgrHujGy/NE72BxOkZ9eSmh5uX D7lejg5Wp7MkblOEI4TsnrlDxNFrlpOUiL/aVYwARUh46WCeCQeLVSWtZuz1JYGTOeA/ 42baCYpSHk8crirv1YnDD+PVe17+xCxeVvaCa0PowRbpex4r+yPSXbjYNQSUkAKI5RA3 yI3eRa6AGtOJZGoTIa9RSeUxOG25cMV0bm0JSP+OpVitCdCAzeZJCWnDfNnQRv3hnAZk hxm1ngb5IVp6Nr0aa/VwZ553nxZs8TZXIFMe8zlwK9aHIr0rHLSrGz/2P0L6sljK+oJ4 jYQQ== X-Forwarded-Encrypted: i=1; AHgh+RrEyvsjCWDLYOnK4wHxWmryxo/WAc5rERDlr19DvMg7fnMFvVYGIjxrD6CyImCAyLMSop46gBo4BCVd@lists.linux.dev X-Gm-Message-State: AOJu0YxPSK7hM9apMWO6uGmk0QIxbuYImzHWRvk5OF2atZdY8+GyXGJ5 o860e+btyPfsc88e6uprOCswcuK4mESS7zqDLC73SjoYjaPlK0sCAQOqzuPBZcSXOCEYUKuYov5 1umP9Kg== X-Received: from pggh8.prod.google.com ([2002:a63:c008:0:b0:c99:aff5:7089]) (user=seanjc job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6a21:110:b0:3b3:65c4:c680 with SMTP id adf61e73a8af0-3c08ed78deamr3358350637.25.1783381623562; Mon, 06 Jul 2026 16:47:03 -0700 (PDT) Date: Mon, 6 Jul 2026 16:47:02 -0700 In-Reply-To: <20260526023515.288829-8-rick.p.edgecombe@intel.com> Precedence: bulk X-Mailing-List: linux-coco@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260526023515.288829-1-rick.p.edgecombe@intel.com> <20260526023515.288829-8-rick.p.edgecombe@intel.com> Message-ID: Subject: Re: [PATCH v6 07/11] KVM: TDX: Allocate PAMT memory for TD and vCPU control structures From: Sean Christopherson To: Rick Edgecombe Cc: bp@alien8.de, dave.hansen@intel.com, hpa@zytor.com, kas@kernel.org, kvm@vger.kernel.org, linux-coco@lists.linux.dev, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, mingo@redhat.com, nik.borisov@suse.com, pbonzini@redhat.com, tglx@kernel.org, vannapurve@google.com, x86@kernel.org, chao.gao@intel.com, yan.y.zhao@intel.com, kai.huang@intel.com, "Kirill A. Shutemov" Content-Type: text/plain; charset="us-ascii" On Mon, May 25, 2026, Rick Edgecombe wrote: > From: "Kirill A. Shutemov" > > Use control page helpers for allocating and freeing TD control structures, > such these operations can work for Dynamic PAMT. > > The TDX module tracks some state for each page of physical memory that it > might use. It calls this state the PAMT. It includes separate state for > each page size a physical page could be utilized at within the TDX module > (1GB, 2MB, 4KB). In Dynamic PAMT, only the 4KB page size state is > allocated dynamically. So the kernel must install PAMT backing for each 4KB > page before gifting it to the TDX module, and tear it down after the page > is reclaimed. > > TD-scoped control pages (TDR, TDCS) and vCPU-scoped control pages (TDVPR, > TDCX) are all handed to the TDX module at 4KB page size and are therefore > subject to this requirement. Replace the raw alloc_page()/__free_page() > calls for these pages with tdx_alloc/free_control_page(). > > Switching between special Dynamic PAMT operations or normal page > alloc/free operations is handled internally in > tdx_alloc/free_control_page(). So don't check for Dynamic PAMT around these > calls. Just call them unconditionally. Similarly, drop the NULL checks > before freeing, as tdx_free_control_page() handles NULL internally. > > No functional change intended when Dynamic PAMT is not in use. > > Assisted-by: GitHub Copilot:claude-opus-4-6 Claude:claude-opus-4-7 Exactly what assistance was given, and when? I certainly didn't use any of these tools, and given that Claude Opus 4.6 was released after I posted the v5 RFC, I doubt Kirill did either. And in my strong opinion, even if AI tooling was used to rebase the patches, I don't think that level of "assistance" should be presented this way. E.g. I would rather a more informal: [ Rick: enhance log, rebase with help from AI tooling] Because unless I'm missing something, claiming that AI was used to write the patch is misleading and disingenuous. > Signed-off-by: Kirill A. Shutemov > [sean: handle alloc+free+reclaim in one patch] > Co-developed-by: Sean Christopherson Where did this come from? I don't think me squashing two patches together warrants a Co-developed-by. > Signed-off-by: Sean Christopherson > [Rick: enhance log] > Signed-off-by: Rick Edgecombe