From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pj1-f73.google.com (mail-pj1-f73.google.com [209.85.216.73]) (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 E0E012F361E for ; Thu, 5 Mar 2026 17:11:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.216.73 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772730670; cv=none; b=uyd8kE8EBU9YEv03wyG4QXImxbrW2Yg4eWO6YreAGHPXN1QA/JBD7agckpXwmESBk89xH6XAjkHjr3jxcxDhSYlM6GwoVaDvtnMJVoH1U+sLgN2CUPj3RqgIIHDtnKYuoPHBRvMdjReVh6rswbVyViS3gJssxbq78wrI9LffDI8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772730670; c=relaxed/simple; bh=EiZRIOma5yT1iQulOJ/Bmg5cPZxIJOZcu7SR6cw9joQ=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=mYGfl66BEDmHpWp5/9JNkaNqPIk1qEldTfTz+j2sP+X7ndsQaWTs83I5SJf3B/szKtobFyA9kAc3MK1kbW7WE0fuNU8QXh2av+TqlxDeScCS2DJVU9XIY/A9+WgDvg8MTdl+fCnCRf57c5b5DURCeOdaWzuKKCIn/N06dELRvrw= 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=QiQpPvUS; arc=none smtp.client-ip=209.85.216.73 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="QiQpPvUS" Received: by mail-pj1-f73.google.com with SMTP id 98e67ed59e1d1-358e425c261so7363696a91.3 for ; Thu, 05 Mar 2026 09:11:09 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1772730669; x=1773335469; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=CtwAMovf8rzdeDDnrlXC+Uv7hAlbzLA4l8aaeE62Qmg=; b=QiQpPvUSmCiA5NIiNNrzCpdGwkVm9sXm8k3yYypNo0DVys4MS4px2WCusQhJUDnXHq cGXcrns2sNekXNBsEKcU9mAlZjIV62YSwe/81ecqIyjNdGIpH30SzWWRaTDjnFXhrlwh WXvpof8bE6/USrV84E0IP0TeBIp/eYWrMocLS7MsN3jy3079//RHQosf4WuERYUV3VhO Ch6Q3eHnWcZXR3WU/88HXoPjOpWvER8rhDd1sq5i5cZ1eksVuLGrCeeB1tqCKc6o1cI+ LkrjBykEe73i05nrAHpszdxgavfvJpotRAu4K6ZXAJeWriZptNF2zYVE5U6FLUSlvoxB Kk1g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1772730669; x=1773335469; 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=CtwAMovf8rzdeDDnrlXC+Uv7hAlbzLA4l8aaeE62Qmg=; b=DQMG2DLBwWJDN0MNI0LBxcfKaMCxPw0r7R+j30RY9McS4ZeM3EWFLyL8DTXLc+A+PN 7bDPfCPZwWNA2Fl2p+bhRaszKObtqSvVvPHdKCwTBmm2Ixyg/wOZraHibzrimmAyditc +YySUYPMvkz0lz8p4Fzr+Q7jEgQNkQO2Va9SZCsgDMraexNZzpXGHAUtmmFRY11Mte+Y BIXIYEj3vokJIx6urB2r1kSX+XmbR7r6J3zwujTYejgn0KQdoES0qky3UKrWIMw1JwYo 8uJ4YQgv96xMphT9no7MfAc/yj3T4pcYTAFQ6KWyAAqeYo+MX0Saha99DanmaDRR1Q+l Aa/w== X-Forwarded-Encrypted: i=1; AJvYcCW7ML93sBVTIUwzYNcjcZYx8Qa58Y+hZhfQx0aVurMfCuJvH44xpq+Lm3H5OKdd/g9oxazvfRs6jIMOiuQ=@vger.kernel.org X-Gm-Message-State: AOJu0YwXXKAmIVyuQZ7ufRKSz3D9hKOijoIzTClmaHcNlyBvz+pyomRt FzWR+gfraV3g6c7N+I89bdxwQ7QtNLx2x2GjLUI3ZRXcR14FaMxP3EP5eD0+gqUlB60tKZ+Qq3Z stSrpZQ== X-Received: from pjoa5.prod.google.com ([2002:a17:90a:8c05:b0:359:8c74:aec4]) (user=seanjc job=prod-delivery.src-stubby-dispatcher) by 2002:a17:90b:184d:b0:359:7906:d998 with SMTP id 98e67ed59e1d1-359a6a4f88bmr5722995a91.18.1772730668917; Thu, 05 Mar 2026 09:11:08 -0800 (PST) Date: Thu, 5 Mar 2026 09:07:59 -0800 In-Reply-To: <20260218210820.2828896-1-seanjc@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260218210820.2828896-1-seanjc@google.com> X-Mailer: git-send-email 2.53.0.473.g4a7958ca14-goog Message-ID: <177272542345.1534825.4006634596500180669.b4-ty@google.com> Subject: Re: [PATCH] KVM: x86/mmu: Don't zero-allocate page table used for splitting a hugepage From: Sean Christopherson To: Sean Christopherson , Paolo Bonzini Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Rick Edgecombe , Kai Huang Content-Type: text/plain; charset="utf-8" On Wed, 18 Feb 2026 13:08:20 -0800, Sean Christopherson wrote: > When splitting hugepages in the TDP MMU, don't zero the new page table on > allocation since tdp_mmu_split_huge_page() is guaranteed to write every > entry and thus every byte. > > Unless someone peeks at the memory between allocating the page table and > writing the child SPTEs, no functional change intended. > > [...] Applied to kvm-x86 mmu, thanks! [1/1] KVM: x86/mmu: Don't zero-allocate page table used for splitting a hugepage https://github.com/kvm-x86/linux/commit/ecb806293213 -- https://github.com/kvm-x86/linux/tree/next