From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [192.55.52.115]) (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 4CF0B1641B for ; Fri, 12 Jan 2024 20:37:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="OZj5hTN6" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1705091855; x=1736627855; h=message-id:date:mime-version:subject:to:cc:references: from:in-reply-to:content-transfer-encoding; bh=7Ghu41Z2IsEQ66CSni8Rd5fHmhbvJ8BiP5Up0k2SILE=; b=OZj5hTN6E0X+EjWCQ8yoXKW5KFf/DSBp0sXr2Mt6z4U8cDrodk4aoVzK nEXiHbhk6/39GIPU3QLgGqalPBdVLMN/pVEgdO9qKXocs/1THRje2GnO1 Zpd6ZVjIIvYS8k2Ch+DpXzqd2vwDqpqUB6wl3Y+ukb2kVzWuoMzKD2II6 X3foetv/vRQgsS8eOSOeLX5kD51WU5FwvxXGf1eg55wiL3vsvFhPva/22 jow6AXQ58DeBmO/InPJ9Y3STY1LmvUPrHXLgd+TZfLmxcjXEcNqFxKQj2 L2z4NZvfR42rHQgI1dLQyrYDoVd0ffXjvTsNVvGFjLPnV5/6r7bhX7+sr Q==; X-IronPort-AV: E=McAfee;i="6600,9927,10951"; a="398959164" X-IronPort-AV: E=Sophos;i="6.04,190,1695711600"; d="scan'208";a="398959164" Received: from fmsmga004.fm.intel.com ([10.253.24.48]) by fmsmga103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 12 Jan 2024 12:37:34 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10951"; a="853392188" X-IronPort-AV: E=Sophos;i="6.04,190,1695711600"; d="scan'208";a="853392188" Received: from yrayx-mobl.amr.corp.intel.com (HELO [10.209.50.27]) ([10.209.50.27]) by fmsmga004-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 12 Jan 2024 12:37:32 -0800 Message-ID: <336b55f9-c7e6-4ec9-806b-cb3659dbfdc3@intel.com> Date: Fri, 12 Jan 2024 12:37:31 -0800 Precedence: bulk X-Mailing-List: linux-coco@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v1 11/26] x86/sev: Invalidate pages from the direct map when adding them to the RMP table Content-Language: en-US To: Tom Lendacky , Borislav Petkov Cc: Michael Roth , x86@kernel.org, kvm@vger.kernel.org, linux-coco@lists.linux.dev, linux-mm@kvack.org, linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org, tglx@linutronix.de, mingo@redhat.com, jroedel@suse.de, hpa@zytor.com, ardb@kernel.org, pbonzini@redhat.com, seanjc@google.com, vkuznets@redhat.com, jmattson@google.com, luto@kernel.org, dave.hansen@linux.intel.com, slp@redhat.com, pgonda@google.com, peterz@infradead.org, srinivas.pandruvada@linux.intel.com, rientjes@google.com, tobin@ibm.com, vbabka@suse.cz, kirill@shutemov.name, ak@linux.intel.com, tony.luck@intel.com, sathyanarayanan.kuppuswamy@linux.intel.com, alpergun@google.com, jarkko@kernel.org, ashish.kalra@amd.com, nikunj.dadhania@amd.com, pankaj.gupta@amd.com, liam.merwick@oracle.com, zhi.a.wang@intel.com, Brijesh Singh References: <20231230161954.569267-1-michael.roth@amd.com> <20231230161954.569267-12-michael.roth@amd.com> <20240112200751.GHZaGcF0-OZVJiIB7y@fat_crate.local> <63297d29-bb24-ac5e-0b47-35e22bb1a2f8@amd.com> From: Dave Hansen Autocrypt: addr=dave.hansen@intel.com; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 1/12/24 12:28, Tom Lendacky wrote: > I thought there was also a desire to remove the direct map for any pages > assigned to a guest as private, not just the case that the comment says. > So updating the comment would probably the best action. I'm not sure who desires that. It's sloooooooow to remove things from the direct map. There's almost certainly a frequency cutoff where running the whole direct mapping as 4k is better than the cost of mapping/unmapping. Actually, where _is_ the TLB flushing here?