From nobody Sat Nov 30 10:55:23 2024 Received: from smtp-fw-52002.amazon.com (smtp-fw-52002.amazon.com [52.119.213.150]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id BA40919D88C; Tue, 10 Sep 2024 15:24:03 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=52.119.213.150 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725981845; cv=none; b=dWgHc4N+dBhwnKPpt4GweX7w8hG+nBc2NiO/P1RVzo5kBcta8GKPMRi4feHDapkHWH4GsxBJNfpOgIQ/vjZSwDxMOA+09Z7jmDgszSy4wE8GJ5j1BWEbF3XM+ospKEPI/zcVo6sA4xe6EUBTNKbLIpbhbfgZ5DhG1cF64VpV3bI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725981845; c=relaxed/simple; bh=znXdsF6eiqKY2HvO6RXCANRQmaZ2fD/Ui+naRYeu3bo=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=rVdPJt9ly1xvsdJZ+TOXoyhMshZZOvIvSjjDNbcJZD+UT+PE+w5doISYhnBc8PDBqfFam5Coq8jTI+JM5R/YfeVu43aCkCGEoeIwKjnNkoxbVKDKPx5PRMKN0qdhQTYX2u8f3gxZ4VAp6yVzfNcDOw8zmjAaPEvok8AhQEZ6f9c= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=amazon.de; spf=pass smtp.mailfrom=amazon.de; dkim=pass (1024-bit key) header.d=amazon.de header.i=@amazon.de header.b=Ksa0qUrs; arc=none smtp.client-ip=52.119.213.150 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=amazon.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=amazon.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=amazon.de header.i=@amazon.de header.b="Ksa0qUrs" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amazon.de; i=@amazon.de; q=dns/txt; s=amazon201209; t=1725981845; x=1757517845; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=U7Ctjd+6veeZS5KO0mrV/5F4c28Jr+9mluYJ7cdyklU=; b=Ksa0qUrs2ixXjwU4sSoYCa/o5uFqyt//cZkM1LkhVsKAyI1XZKkYvBmo MEHy3K1e7gWafhv4P/TyurtW3dESIBVA35xzi4RWRuWp2zThrsalF3H8C inQ/IHBSqKkSnJgzGbJ7U+qbruAMJF+VHdew7x34r2t0TUUZNXdefk0Vk w=; X-IronPort-AV: E=Sophos;i="6.10,217,1719878400"; d="scan'208";a="658004108" Received: from iad12-co-svc-p1-lb1-vlan3.amazon.com (HELO smtpout.prod.us-west-2.prod.farcaster.email.amazon.dev) ([10.43.8.6]) by smtp-border-fw-52002.iad7.amazon.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 10 Sep 2024 15:24:01 +0000 Received: from EX19MTAEUB002.ant.amazon.com [10.0.43.254:63064] by smtpin.naws.eu-west-1.prod.farcaster.email.amazon.dev [10.0.7.67:2525] with esmtp (Farcaster) id 3e155601-fb36-42be-a9bf-a8884a254509; Tue, 10 Sep 2024 15:23:58 +0000 (UTC) X-Farcaster-Flow-ID: 3e155601-fb36-42be-a9bf-a8884a254509 Received: from EX19D014EUA004.ant.amazon.com (10.252.50.41) by EX19MTAEUB002.ant.amazon.com (10.252.51.59) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA) id 15.2.1258.34; Tue, 10 Sep 2024 15:23:58 +0000 Received: from EX19MTAUEC001.ant.amazon.com (10.252.135.222) by EX19D014EUA004.ant.amazon.com (10.252.50.41) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA) id 15.2.1258.34; Tue, 10 Sep 2024 15:23:58 +0000 Received: from dev-dsk-nikwip-1b-bc9ec026.eu-west-1.amazon.com (10.253.74.52) by mail-relay.amazon.com (10.252.135.200) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA) id 15.2.1258.34 via Frontend Transport; Tue, 10 Sep 2024 15:23:56 +0000 From: Nikolas Wipper To: Paolo Bonzini , Sean Christopherson , Vitaly Kuznetsov CC: Nicolas Saenz Julienne , Alexander Graf , James Gowans , , Thomas Gleixner , "Ingo Molnar" , Borislav Petkov , Dave Hansen , , , , , , , , Nikolas Wipper Subject: [PATCH 06/15] KVM: x86/mmu: Implement PWALK_SET_ACCESSED in page walker Date: Tue, 10 Sep 2024 15:21:58 +0000 Message-ID: <20240910152207.38974-7-nikwip@amazon.de> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20240910152207.38974-1-nikwip@amazon.de> References: <20240910152207.38974-1-nikwip@amazon.de> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Implement PWALK_SET_ACCESSED in the page walker. This flag allows controling whether the page walker will set the accessed bits after a successful page walk in all page table levels. If the page walk is aborted for any reason, none of the access bits are set. Signed-off-by: Nikolas Wipper --- arch/x86/kvm/mmu/paging_tmpl.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/x86/kvm/mmu/paging_tmpl.h b/arch/x86/kvm/mmu/paging_tmpl.h index c278b83b023f..eed6e2c653ba 100644 --- a/arch/x86/kvm/mmu/paging_tmpl.h +++ b/arch/x86/kvm/mmu/paging_tmpl.h @@ -317,6 +317,7 @@ static int FNAME(walk_addr_generic)(struct guest_walker= *walker, const int write_fault =3D access & PFERR_WRITE_MASK; const int user_fault =3D access & PFERR_USER_MASK; const int fetch_fault =3D access & PFERR_FETCH_MASK; + const int set_accessed =3D flags & PWALK_SET_ACCESSED; u16 errcode =3D 0; gpa_t real_gpa; gfn_t gfn; @@ -468,7 +469,7 @@ static int FNAME(walk_addr_generic)(struct guest_walker= *walker, accessed_dirty &=3D pte >> (PT_GUEST_DIRTY_SHIFT - PT_GUEST_ACCESSED_SHIFT); =20 - if (unlikely(!accessed_dirty)) { + if (unlikely(set_accessed && !accessed_dirty)) { ret =3D FNAME(update_accessed_dirty_bits)(vcpu, mmu, walker, addr, write_fault); if (unlikely(ret < 0)) --=20 2.40.1 Amazon Web Services Development Center Germany GmbH Krausenstr. 38 10117 Berlin Geschaeftsfuehrung: Christian Schlaeger, Jonathan Weiss Eingetragen am Amtsgericht Charlottenburg unter HRB 257764 B Sitz: Berlin Ust-ID: DE 365 538 597