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=-19.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=unavailable 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 857EAC433E6 for ; Mon, 15 Mar 2021 14:35:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5E6D664F1E for ; Mon, 15 Mar 2021 14:35:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235974AbhCOOer (ORCPT ); Mon, 15 Mar 2021 10:34:47 -0400 Received: from mail.kernel.org ([198.145.29.99]:35186 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233414AbhCOOBk (ORCPT ); Mon, 15 Mar 2021 10:01:40 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 0FE8C64F2F; Mon, 15 Mar 2021 14:01:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1615816876; bh=cEGCOtMDGpg659riwCNFXJ4O5WLv1yj7SL9t6GPLMIU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Opf26JjcpjOnHZE7v46CYhy3+RPWAo+4p8hquFNOEzec2sZoAzpYg8hcQZd5IzpSx 5uTHiAhJ51oSyGOKfRJtDrHl+r/S/UqKRl4nHc6wYETD6zzWwPXnd3L3K9CsG6cDlp up22/CLQJ7431Rts8A5pSIARA9pJD7F24IaCUFoQ= From: gregkh@linuxfoundation.org To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Marc Zyngier , Andrew Jones , Eric Auger Subject: [PATCH 5.4 165/168] KVM: arm64: Reject VM creation when the default IPA size is unsupported Date: Mon, 15 Mar 2021 14:56:37 +0100 Message-Id: <20210315135555.785710226@linuxfoundation.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210315135550.333963635@linuxfoundation.org> References: <20210315135550.333963635@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Greg Kroah-Hartman From: Marc Zyngier Commit 7d717558dd5ef10d28866750d5c24ff892ea3778 upstream. KVM/arm64 has forever used a 40bit default IPA space, partially due to its 32bit heritage (where the only choice is 40bit). However, there are implementations in the wild that have a *cough* much smaller *cough* IPA space, which leads to a misprogramming of VTCR_EL2, and a guest that is stuck on its first memory access if userspace dares to ask for the default IPA setting (which most VMMs do). Instead, blundly reject the creation of such VM, as we can't satisfy the requirements from userspace (with a one-off warning). Also clarify the boot warning, and document that the VM creation will fail when an unsupported IPA size is provided. Although this is an ABI change, it doesn't really change much for userspace: - the guest couldn't run before this change, but no error was returned. At least userspace knows what is happening. - a memory slot that was accepted because it did fit the default IPA space now doesn't even get a chance to be registered. The other thing that is left doing is to convince userspace to actually use the IPA space setting instead of relying on the antiquated default. Fixes: 233a7cb23531 ("kvm: arm64: Allow tuning the physical address size for VM") Signed-off-by: Marc Zyngier Cc: stable@vger.kernel.org Reviewed-by: Andrew Jones Reviewed-by: Eric Auger Link: https://lore.kernel.org/r/20210311100016.3830038-2-maz@kernel.org Signed-off-by: Greg Kroah-Hartman --- Documentation/virt/kvm/api.txt | 3 +++ arch/arm64/kvm/reset.c | 11 ++++++++--- 2 files changed, 11 insertions(+), 3 deletions(-) --- a/Documentation/virt/kvm/api.txt +++ b/Documentation/virt/kvm/api.txt @@ -172,6 +172,9 @@ is dependent on the CPU capability and t be retrieved using KVM_CAP_ARM_VM_IPA_SIZE of the KVM_CHECK_EXTENSION ioctl() at run-time. +Creation of the VM will fail if the requested IPA size (whether it is +implicit or explicit) is unsupported on the host. + Please note that configuring the IPA size does not affect the capability exposed by the guest CPUs in ID_AA64MMFR0_EL1[PARange]. It only affects size of the address translated by the stage2 level (guest physical to --- a/arch/arm64/kvm/reset.c +++ b/arch/arm64/kvm/reset.c @@ -378,10 +378,10 @@ void kvm_set_ipa_limit(void) pr_info("kvm: Limiting the IPA size due to kernel %s Address limit\n", (va_max < pa_max) ? "Virtual" : "Physical"); - WARN(ipa_max < KVM_PHYS_SHIFT, - "KVM IPA limit (%d bit) is smaller than default size\n", ipa_max); kvm_ipa_limit = ipa_max; - kvm_info("IPA Size Limit: %dbits\n", kvm_ipa_limit); + kvm_info("IPA Size Limit: %d bits%s\n", kvm_ipa_limit, + ((kvm_ipa_limit < KVM_PHYS_SHIFT) ? + " (Reduced IPA size, limited VM/VMM compatibility)" : "")); } /* @@ -408,6 +408,11 @@ int kvm_arm_setup_stage2(struct kvm *kvm return -EINVAL; } else { phys_shift = KVM_PHYS_SHIFT; + if (phys_shift > kvm_ipa_limit) { + pr_warn_once("%s using unsupported default IPA limit, upgrade your VMM\n", + current->comm); + return -EINVAL; + } } parange = read_sanitised_ftr_reg(SYS_ID_AA64MMFR0_EL1) & 7;