From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from verein.lst.de (verein.lst.de [213.95.11.211]) (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 CF46F19515 for ; Tue, 27 Jun 2023 15:58:03 +0000 (UTC) Received: by verein.lst.de (Postfix, from userid 2407) id 555E667373; Tue, 27 Jun 2023 17:48:02 +0200 (CEST) Date: Tue, 27 Jun 2023 17:48:02 +0200 From: Christoph Hellwig To: Petr =?utf-8?B?VGVzYcWZw61r?= Cc: Robin Murphy , Greg Kroah-Hartman , Petr Tesarik , Stefano Stabellini , Thomas Bogendoerfer , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" , "H. Peter Anvin" , "Rafael J. Wysocki" , Juergen Gross , Oleksandr Tyshchenko , Christoph Hellwig , Marek Szyprowski , Andy Shevchenko , Hans de Goede , Jason Gunthorpe , Kees Cook , Saravana Kannan , "moderated list:XEN HYPERVISOR ARM" , "moderated list:ARM PORT" , open list , "open list:MIPS" , "open list:XEN SWIOTLB SUBSYSTEM" , Roberto Sassu , Kefeng Wang Subject: Re: [PATCH v3 1/7] swiotlb: make io_tlb_default_mem local to swiotlb.c Message-ID: <20230627154802.GA29567@lst.de> References: <2023062745-routing-palace-d0b4@gregkh> <73f11258-1562-17c1-969e-b134dcb5f35c@arm.com> <20230627133006.16ee11af@meshulam.tesarici.cz> Precedence: bulk X-Mailing-List: iommu@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20230627133006.16ee11af@meshulam.tesarici.cz> User-Agent: Mutt/1.5.17 (2007-11-01) On Tue, Jun 27, 2023 at 01:30:06PM +0200, Petr Tesařík wrote: > Xen is the only user of an "is SWIOTLB present" interface. IIUC Xen > needs bounce buffers for the PCI frontend driver, but if there is no > other reason to have a SWIOTLB, the system does not set up one at boot. Please take a look at my "unexport swiotlb_active v2" series that unfortunately missed the 6.5 merge window waiting for reviews. 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 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 2B34FEB64DC for ; Tue, 27 Jun 2023 15:48:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=fTt0yvT41o3PlatTX1Lc7baihBskozwQSSU/eBxUD8E=; b=P+wTaQze3RJBzU FsbzoDveEKd+/WAkokSKEFRMjhKNfUqkCwpQJexCWhOThoNT9AT1toPn2pc41fmEQlatg9P07b3V5 vIB/9PUoQPpbZR9shei1LtK8nhW+6GZBkhiXPCgPp6UlGuknaNMwYdvnTFdYOCRQxZ5StX1KVATOy Y3FTC2bnTg9eB2nDX6Hn0fisFpazr92sGIy1Jzx6FphOFFy52m9P0iA2CBrcA9otPTy9y5zaRGq4X JmM+0prs1qIcLoX+cAJWU7RHaQPlOBXszT7Y70n7RyzK41oisqVboVV4ovbNSe+aIGbk/oUs6TEvJ an86VYteFUDsqWWjeYDg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1qEAvQ-00DYsj-30; Tue, 27 Jun 2023 15:48:16 +0000 Received: from verein.lst.de ([213.95.11.211]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1qEAvN-00DYrC-38 for linux-arm-kernel@lists.infradead.org; Tue, 27 Jun 2023 15:48:15 +0000 Received: by verein.lst.de (Postfix, from userid 2407) id 555E667373; Tue, 27 Jun 2023 17:48:02 +0200 (CEST) Date: Tue, 27 Jun 2023 17:48:02 +0200 From: Christoph Hellwig To: Petr =?utf-8?B?VGVzYcWZw61r?= Cc: Robin Murphy , Greg Kroah-Hartman , Petr Tesarik , Stefano Stabellini , Thomas Bogendoerfer , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" , "H. Peter Anvin" , "Rafael J. Wysocki" , Juergen Gross , Oleksandr Tyshchenko , Christoph Hellwig , Marek Szyprowski , Andy Shevchenko , Hans de Goede , Jason Gunthorpe , Kees Cook , Saravana Kannan , "moderated list:XEN HYPERVISOR ARM" , "moderated list:ARM PORT" , open list , "open list:MIPS" , "open list:XEN SWIOTLB SUBSYSTEM" , Roberto Sassu , Kefeng Wang Subject: Re: [PATCH v3 1/7] swiotlb: make io_tlb_default_mem local to swiotlb.c Message-ID: <20230627154802.GA29567@lst.de> References: <2023062745-routing-palace-d0b4@gregkh> <73f11258-1562-17c1-969e-b134dcb5f35c@arm.com> <20230627133006.16ee11af@meshulam.tesarici.cz> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20230627133006.16ee11af@meshulam.tesarici.cz> User-Agent: Mutt/1.5.17 (2007-11-01) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230627_084814_198564_B6C27078 X-CRM114-Status: GOOD ( 12.76 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org T24gVHVlLCBKdW4gMjcsIDIwMjMgYXQgMDE6MzA6MDZQTSArMDIwMCwgUGV0ciBUZXNhxZnDrWsg d3JvdGU6Cj4gWGVuIGlzIHRoZSBvbmx5IHVzZXIgb2YgYW4gImlzIFNXSU9UTEIgcHJlc2VudCIg aW50ZXJmYWNlLiBJSVVDIFhlbgo+IG5lZWRzIGJvdW5jZSBidWZmZXJzIGZvciB0aGUgUENJIGZy b250ZW5kIGRyaXZlciwgYnV0IGlmIHRoZXJlIGlzIG5vCj4gb3RoZXIgcmVhc29uIHRvIGhhdmUg YSBTV0lPVExCLCB0aGUgc3lzdGVtIGRvZXMgbm90IHNldCB1cCBvbmUgYXQgYm9vdC4KClBsZWFz ZSB0YWtlIGEgbG9vayBhdCBteSAidW5leHBvcnQgc3dpb3RsYl9hY3RpdmUgdjIiIHNlcmllcyB0 aGF0CnVuZm9ydHVuYXRlbHkgbWlzc2VkIHRoZSA2LjUgbWVyZ2Ugd2luZG93IHdhaXRpbmcgZm9y IHJldmlld3MuCgpfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f XwpsaW51eC1hcm0ta2VybmVsIG1haWxpbmcgbGlzdApsaW51eC1hcm0ta2VybmVsQGxpc3RzLmlu ZnJhZGVhZC5vcmcKaHR0cDovL2xpc3RzLmluZnJhZGVhZC5vcmcvbWFpbG1hbi9saXN0aW5mby9s aW51eC1hcm0ta2VybmVsCg==