From patchwork Mon Oct 17 11:52:08 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Will Deacon X-Patchwork-Id: 13008717 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 34E3FC4332F for ; Mon, 17 Oct 2022 12:07:41 +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=xby2z2k/ms5nvE0/lSlr+GKkfVDpmIDIbfwa/tfaK2w=; b=fs/vHUVP/jDXH9 6XjFjHDLwGnkE4M8XoCwAZa09v+NPlXkbYS2itWBMRM/+dVYL4okYZVB/cOvtlGp5afBTRtQ0/CWb fM8LziX+WDGyKVpVPE0F3ThsBhSvDX8TEa3jlmWyWsRRqtKIHgfMi6cbm5EHBdWDkvmnXzccOaCTb W7VHlFBXzfjNd6TKN2BM9Xijh1QyIOkKmlIAALsBdCDdP82Z6Q9eG5G0L/MsVrvFrXuVhdH57V5MN l/cDRu2ex8nuXJMLzG95sSgr57owVvjXR+bkPFdy8BVvdw5iDVrBSlWwHnl2iNzALEX/qDOZt+ore 8dpcxaQGRI2WVTPHY1Pg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1okOst-00BNIZ-5S; Mon, 17 Oct 2022 12:06:20 +0000 Received: from ams.source.kernel.org ([145.40.68.75]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1okOgn-00BDX7-Lk for linux-arm-kernel@lists.infradead.org; Mon, 17 Oct 2022 11:53:51 +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 55660B81637; Mon, 17 Oct 2022 11:53:48 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 12BDAC4347C; Mon, 17 Oct 2022 11:53:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1666007627; bh=o1+D7GlEbIo/66tqzr55voUAuV+8d8HNm+7m2mJHTnU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ZEvz1dN9V2J6DfWwaHcINmGNk5KfC+DrGecS/CYfMFt3bqlb0z/5Gu4lSnVKrjvLR H+pq4EHAvciAwcJl8/5q0a3v/7vsiJweWJzs1FpIZu0dG+Pbh9xeATxkEIO2suI4wk 3MnGnzPp0BYBQt2he5snpb62IhURuZt7VIvWmQn12j1+1Aj4rdWnTMLTVnD4yu6gfJ ASqmT6v4l8QDNir6qvaiUj2logQs2EkcsyuwVnDkzpFkkOIZvcIXFbdAg7EUJrL0rO 87/VupeAHUljJt5U8ZkRnCXVOfEABvq163z88euFMFVOqPo+KzvJh1hQEAia8fCt72 wyuK82vvGkgog== From: Will Deacon To: kvmarm@lists.linux.dev 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 v4 24/25] KVM: arm64: Don't unnecessarily map host kernel sections at EL2 Date: Mon, 17 Oct 2022 12:52:08 +0100 Message-Id: <20221017115209.2099-25-will@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20221017115209.2099-1-will@kernel.org> References: <20221017115209.2099-1-will@kernel.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20221017_045350_077761_3ABDA0E5 X-CRM114-Status: GOOD ( 14.84 ) 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 We no longer need to map the host's '.rodata' and '.bss' sections in the stage-1 page-table of the pKVM hypervisor at EL2, so remove those mappings and avoid creating any future dependencies at EL2 on host-controlled data structures. Tested-by: Vincent Donnefort Signed-off-by: Quentin Perret Signed-off-by: Will Deacon --- arch/arm64/kernel/image-vars.h | 6 ------ arch/arm64/kvm/hyp/nvhe/setup.c | 14 +++----------- 2 files changed, 3 insertions(+), 17 deletions(-) diff --git a/arch/arm64/kernel/image-vars.h b/arch/arm64/kernel/image-vars.h index 31ad75da4d58..e3f88b5836a2 100644 --- a/arch/arm64/kernel/image-vars.h +++ b/arch/arm64/kernel/image-vars.h @@ -102,12 +102,6 @@ KVM_NVHE_ALIAS_HYP(__memcpy, __pi_memcpy); KVM_NVHE_ALIAS_HYP(__memset, __pi_memset); #endif -/* Kernel memory sections */ -KVM_NVHE_ALIAS(__start_rodata); -KVM_NVHE_ALIAS(__end_rodata); -KVM_NVHE_ALIAS(__bss_start); -KVM_NVHE_ALIAS(__bss_stop); - /* Hyp memory sections */ KVM_NVHE_ALIAS(__hyp_idmap_text_start); KVM_NVHE_ALIAS(__hyp_idmap_text_end); diff --git a/arch/arm64/kvm/hyp/nvhe/setup.c b/arch/arm64/kvm/hyp/nvhe/setup.c index 5a371ab236db..5cdf3fb09bb4 100644 --- a/arch/arm64/kvm/hyp/nvhe/setup.c +++ b/arch/arm64/kvm/hyp/nvhe/setup.c @@ -144,23 +144,15 @@ static int recreate_hyp_mappings(phys_addr_t phys, unsigned long size, } /* - * Map the host's .bss and .rodata sections RO in the hypervisor, but - * transfer the ownership from the host to the hypervisor itself to - * make sure it can't be donated or shared with another entity. + * Map the host sections RO in the hypervisor, but transfer the + * ownership from the host to the hypervisor itself to make sure they + * can't be donated or shared with another entity. * * The ownership transition requires matching changes in the host * stage-2. This will be done later (see finalize_host_mappings()) once * the hyp_vmemmap is addressable. */ prot = pkvm_mkstate(PAGE_HYP_RO, PKVM_PAGE_SHARED_OWNED); - ret = pkvm_create_mappings(__start_rodata, __end_rodata, prot); - if (ret) - return ret; - - ret = pkvm_create_mappings(__hyp_bss_end, __bss_stop, prot); - if (ret) - return ret; - ret = pkvm_create_mappings(&kvm_vgic_global_state, &kvm_vgic_global_state + 1, prot); if (ret)