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 6D90DC4167B for ; Wed, 6 Dec 2023 11:53:00 +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=G/POk+24Gc+ipgr8Lpc/s4j9FCimJF7GQPAAmyD1/QQ=; b=Bh/wWtTn2Thbha XSjd4oUkvWnbvsihgJzBcFBt8yxpyfChEAhUeXUt9Qwm0FCWdSNoq6aVGxe7TZzhH70Fyjw03hyn7 7ws4HXXPfOCPm2Db4xrRBMURawqch5e7T8gWcvU3OLkFDUDT/kPxCg4MkJuTGqzouJm2smMgeJRad zBv9pHB5W9QwS+zJO9uCRbni657Zo1xhBApUPszktoZR9yAFjtDtfZRJ6VOBbvsN4CnfYwKH9Qejm 1ysm3A9+EL+FkhM/pbqyeHwhgXA4jx7v9Yhycbiag7sF7uQWRlkFuM+KImkDUuFFCko8sieP/DZli 9BECZVGZQ+FZn+cHgeHA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1rAqSB-00AAC2-1G; Wed, 06 Dec 2023 11:52:35 +0000 Received: from dfw.source.kernel.org ([2604:1380:4641:c500::1]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1rAqS8-00AA96-0w for linux-arm-kernel@lists.infradead.org; Wed, 06 Dec 2023 11:52:33 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id CCB5F61C35; Wed, 6 Dec 2023 11:52:31 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6CFF0C433C7; Wed, 6 Dec 2023 11:52:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1701863551; bh=05fhoFGytrb/RJVFsqCfWb/MpYZO3vCszNXvCTYOi5I=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=m8uHeg6+sgeVDfycKFuNZurfjPt2fm+n6wDkQ2SIs7zyPppjfdb2wm1va/48JA0TP I1W704/kf75kVpMltgXOgSY4eseh24mIbw19LRFUEJVfd/c/wmYe73odbLOo/5XmWX sFcS/mGGxs7HRYLdErEeAbyFTFMqvKU9uCzB/Wrx6ZCMM0RFZ+vyMOQ7ZydeeB9h6U qxpC1YE4z6o1/Vy43ZMxA6Ct+J67pShbtcOqSkrV/7VbsWnQfFvHsFkflCcy+2+H6I WJmjaPF+/BQfCb6TPQDsXEDG9egNaA5cy6ZqmGOCw1m3ktAdpIY36JlLT+BfUYxlpL FCpOHg+/KS0Qg== Date: Wed, 6 Dec 2023 12:52:22 +0100 From: Lorenzo Pieralisi To: Catalin Marinas Cc: Marc Zyngier , Jason Gunthorpe , ankita@nvidia.com, Shameerali Kolothum Thodi , oliver.upton@linux.dev, suzuki.poulose@arm.com, yuzenghui@huawei.com, will@kernel.org, ardb@kernel.org, akpm@linux-foundation.org, gshan@redhat.com, aniketa@nvidia.com, cjia@nvidia.com, kwankhede@nvidia.com, targupta@nvidia.com, vsethi@nvidia.com, acurrid@nvidia.com, apopple@nvidia.com, jhubbard@nvidia.com, danw@nvidia.com, mochs@nvidia.com, kvmarm@lists.linux.dev, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH v2 1/1] KVM: arm64: allow the VM to select DEVICE_* and NORMAL_NC for IO memory Message-ID: References: <20231205033015.10044-1-ankita@nvidia.com> <86fs0hatt3.wl-maz@kernel.org> <20231205130517.GD2692119@nvidia.com> <20231205164318.GG2692119@nvidia.com> <86bkb4bn2v.wl-maz@kernel.org> <86a5qobkt8.wl-maz@kernel.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20231206_035232_371215_B73924EC X-CRM114-Status: GOOD ( 18.29 ) 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="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Tue, Dec 05, 2023 at 06:40:42PM +0000, Catalin Marinas wrote: > On Tue, Dec 05, 2023 at 05:50:27PM +0000, Marc Zyngier wrote: > > On Tue, 05 Dec 2023 17:33:01 +0000, > > Catalin Marinas wrote: > > > Ideally we should do this for vfio only but we don't have an easy > > > way to convey this to KVM. > > > > But if we want to limit this to PCIe, we'll have to find out. The > > initial proposal (a long while ago) had a flag conveying some > > information, and I'd definitely feel more confident having something > > like that. > > We can add a VM_PCI_IO in the high vma flags to be set by > vfio_pci_core_mmap(), though it limits it to 64-bit architectures. KVM > knows this is PCI and relaxes things a bit. It's not generic though if > we need this later for something else. > > A question for Lorenzo: do these BARs appear in iomem_resource? We could > search that up instead of a flag, something like the page_is_ram() > helper. They do but an iomem_resource look-up alone if I am not mistaken would not tell us if it is PCI address space, we would need additional checks (like detecting if we are decoding an address within a PCI host bridge windows) to determine that if we go down this route. Lorenzo _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel