From patchwork Wed Sep 14 08:34:37 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Will Deacon X-Patchwork-Id: 12975806 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 1A0D1ECAAD8 for ; Wed, 14 Sep 2022 08:37:31 +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:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=lUagR0YvqxiTS0t7kPU4wRTnbUVh1AwRbNDdrC/TsTo=; b=TTYYQzw6lRDRbE u9muA62EU4BKYruEju71BQfKv1UPR58w3OVoahg0lNyxlCrE+siuur2I9y7HUbe8IxAvO2wmBwoFJ I7QjzvJdjpUOJtHTwYILoeFcLEE8H9RpD6kkq79vGNFJMFQH/SvW3p0gYOCamnL3jP56MfuYRm6as Eugyyaf9s1UXAQ6nl6IypYGYr76l0kjKK8ji2J3u7xo9BNxOQ+ndGDVGs7WWsOTowohel7ENZN4by CZ30ECvt9Rf32XQ6A8/oyWTv4c3ozZCq41UqWJF9vKH/I+M0f2qgEcV608/irOhZZ1Q5/iSdtqQNP xShsbVjMYueep3kktIkA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1oYNsa-00DcQ1-HG; Wed, 14 Sep 2022 08:36:20 +0000 Received: from ams.source.kernel.org ([2604:1380:4601:e00::1]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1oYNrb-00DbuI-Gp for linux-arm-kernel@lists.infradead.org; Wed, 14 Sep 2022 08:35:21 +0000 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id E6ECFB8163C; Wed, 14 Sep 2022 08:35:17 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9DCF6C433D6; Wed, 14 Sep 2022 08:35:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1663144516; bh=wTTdQWUvyZH6c3nEbsfnPkmCEbPghOtqLvRf1xG/40Q=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=T+ngWi3OxD2sR+hlSgKMwa58N9pNSJ7/3Upa60OO9ovhoIhsku3G3yoyru1Rob6CW aTi1KhZVzIY6inYs30BaOK7dwDMbhZc6yg+GxuxBQMALb2zb7FnfXbhMbatfezgNoq itC7fcNmr3Udb4gdIqlWro3cr0LVGf3eLRz4ef6ruy8sfStepJYnQ9cYao4sOhGCA5 D5onhJKDzx8OGnG83UZ/ADSgGGc9KY19p7zCA2Lu/T26G4qmR58HaKw+dd0guc+Yp3 02Mw7bWiMYRj/Gf3/cf3Lh63Oa7XBB4iculq74X9xtyk49Fo6lmKOcHwEP2fDPHYGS sWpOHZQ5eTsXg== From: Will Deacon To: kvmarm@lists.cs.columbia.edu Cc: Will Deacon , Sean Christopherson , Vincent Donnefort , Alexandru Elisei , Catalin Marinas , James Morse , Chao Peng , Quentin Perret , Suzuki K Poulose , Mark Rutland , Fuad Tabba , Oliver Upton , Marc Zyngier , kernel-team@android.com, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH v3 02/25] KVM: arm64: Allow attaching of non-coalescable pages to a hyp pool Date: Wed, 14 Sep 2022 09:34:37 +0100 Message-Id: <20220914083500.5118-3-will@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20220914083500.5118-1-will@kernel.org> References: <20220914083500.5118-1-will@kernel.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220914_013519_749100_39C0BE5C X-CRM114-Status: GOOD ( 15.53 ) 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: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Quentin Perret All the contiguous pages used to initialize a 'struct hyp_pool' are considered coalescable, which means that the hyp page allocator will actively try to merge them with their buddies on the hyp_put_page() path. However, using hyp_put_page() on a page that is not part of the inital memory range given to a hyp_pool() is currently unsupported. In order to allow dynamically extending hyp pools at run-time, add a check to __hyp_attach_page() to allow inserting 'external' pages into the free-list of order 0. This will be necessary to allow lazy donation of pages from the host to the hypervisor when allocating guest stage-2 page-table pages at EL2. Signed-off-by: Quentin Perret Signed-off-by: Will Deacon --- arch/arm64/kvm/hyp/nvhe/page_alloc.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/arch/arm64/kvm/hyp/nvhe/page_alloc.c b/arch/arm64/kvm/hyp/nvhe/page_alloc.c index 1ded09fc9b10..0d15227aced8 100644 --- a/arch/arm64/kvm/hyp/nvhe/page_alloc.c +++ b/arch/arm64/kvm/hyp/nvhe/page_alloc.c @@ -93,11 +93,15 @@ static inline struct hyp_page *node_to_page(struct list_head *node) static void __hyp_attach_page(struct hyp_pool *pool, struct hyp_page *p) { + phys_addr_t phys = hyp_page_to_phys(p); unsigned short order = p->order; struct hyp_page *buddy; memset(hyp_page_to_virt(p), 0, PAGE_SIZE << p->order); + if (phys < pool->range_start || phys >= pool->range_end) + goto insert; + /* * Only the first struct hyp_page of a high-order page (otherwise known * as the 'head') should have p->order set. The non-head pages should @@ -116,6 +120,7 @@ static void __hyp_attach_page(struct hyp_pool *pool, p = min(p, buddy); } +insert: /* Mark the new head, and insert it */ p->order = order; page_add_to_list(p, &pool->free_area[order]);