From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.3 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS,USER_AGENT_MUTT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 53992C282C3 for ; Tue, 22 Jan 2019 05:47:03 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id EEC8C20879 for ; Tue, 22 Jan 2019 05:47:02 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=ozlabs.org header.i=@ozlabs.org header.b="I5JSTUMN" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org EEC8C20879 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=ozlabs.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 43kHVX2zCbzDqMh for ; Tue, 22 Jan 2019 16:47:00 +1100 (AEDT) Received: from ozlabs.org (bilbo.ozlabs.org [IPv6:2401:3900:2:1::2]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 43kHPs3whQzDqMk for ; Tue, 22 Jan 2019 16:42:57 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=ozlabs.org Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; secure) header.d=ozlabs.org header.i=@ozlabs.org header.b="I5JSTUMN"; dkim-atps=neutral Received: by ozlabs.org (Postfix, from userid 1003) id 43kHPs0s94z9s7T; Tue, 22 Jan 2019 16:42:56 +1100 (AEDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ozlabs.org; s=201707; t=1548135777; bh=gZMu+NfylDzzW+RSKGTA4tAO39Gye9VkVXQklu5M/8E=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=I5JSTUMNZh1hxndBFSjZ+rNwxwv5OCEwVEXgGjrrhlCP3zYW95C/T2rY/OQQlgFFK d+nukoAC7lsyaJkIQjep85AnSLgTEEVay34K7YcyE8zZ5lXWgTjwvxy8ch8BZo4DfP Jd60rqWz089PokjCahTJSrb6KuYICzd4Cm41yO1rG3SavZaGcOjehIlN8iX9nNIIwb mEZHjHnhavXMfCwxEoxO8T/FSzfJIW2luXykFMaauPWmFgqlBhN2wRFdImLpEi2hEB udVvEm7X0ZvJIrYTp4p5K4IUf0proAvZZlpPuwOxjyhc0pe5qXaJZzjOgm0+4Mgiu9 ERoRuOwPCYnJw== Date: Tue, 22 Jan 2019 16:26:57 +1100 From: Paul Mackerras To: =?iso-8859-1?Q?C=E9dric?= Le Goater Subject: Re: [PATCH 18/19] KVM: PPC: Book3S HV: add passthrough support Message-ID: <20190122052657.GG15124@blackberry> References: <20190107184331.8429-1-clg@kaod.org> <20190107191006.10648-1-clg@kaod.org> <20190107191006.10648-2-clg@kaod.org> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20190107191006.10648-2-clg@kaod.org> User-Agent: Mutt/1.5.24 (2015-08-30) X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kvm@vger.kernel.org, kvm-ppc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, David Gibson Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Mon, Jan 07, 2019 at 08:10:05PM +0100, Cédric Le Goater wrote: > Clear the ESB pages from the VMA of the IRQ being pass through to the > guest and let the fault handler repopulate the VMA when the ESB pages > are accessed for an EOI or for a trigger. Why do we want to do this? I don't see any possible advantage to removing the PTEs from the userspace mapping. You'll need to explain further. Paul.