From patchwork Thu May 19 13:41:10 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Will Deacon X-Patchwork-Id: 12855130 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 532FFC433FE for ; Thu, 19 May 2022 14:09:02 +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=SykimynuzRQpDtncRzrbLz19qAUyqpePMlrbHicy7wg=; b=o4E2owFGWdMoCj iv//pWcEq0ew/ENh0872Cnqnsqwg+8u47Ln/mdJITZrTy7NdXjgxntOh2eBa78To0VVamoAyeptq6 qrsJE1HAD9Z8UG5OxgEmXH2XxeWc/3iddkOJS+x2EW71UzMkLL+QuCb8CdTDp8lHGh+03Jq9Y3Ibh f/W2pfEU8cTDDDGqKMGr6qwFMXwi1JuWWZ9yK9GFB9P/ltEXCw8QePddWJcxRLYw61if3ALZvrkmE yjV04Ho5cwAehuM/d5Q0NeUXdZCB6YLxVvaJqpvMUS3+TIk5co0PULd6Fjca7jn7cDIEbnhDJ6fGC eYB4YMjZpdoevCnKtvlQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nrgoY-007GOh-OZ; Thu, 19 May 2022 14:07:43 +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 1nrgSM-0075yx-Uj for linux-arm-kernel@lists.infradead.org; Thu, 19 May 2022 13:44:49 +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 53301B824A6; Thu, 19 May 2022 13:44:45 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id A2201C385AA; Thu, 19 May 2022 13:44:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1652967884; bh=4phMg5qKrrVOBZXC4vAMZ7uzsL/5lQSk91h6zsw+z5Q=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=eYWUF7O+dZINKj8uUBJpxtiB+gKrfEI/2nL7l0N2Lr5z7rDx+cb0dAwDbLOcrYoGY WWM9Ip1wrYt2oIR8x34eqWc/uKJatACQ3BBWo6RdvTSOcuoRNh8aZriG5Ap+nN4Cc4 sGlX1GkSoza2sWPCH+ZnmulcJRnnGkgoDUokF5hSoWC4MdHyh1CaQUtqIbf1Pq2/cj 44Oo9U2tqWNRXFu64vNzoRvFXHZ4k1EXABMGdZjLMcNNM95bacGWt9AFeQcQkDtmaS SexpSKJc2RvTJ75aUFSaXQ8Bz2JU2uOph3beGtY23t+1DAaeC55ZnsUby52r1F2Ij4 /DfDowgaTA3fw== From: Will Deacon To: kvmarm@lists.cs.columbia.edu Cc: Will Deacon , Ard Biesheuvel , Sean Christopherson , Alexandru Elisei , Andy Lutomirski , Catalin Marinas , James Morse , Chao Peng , Quentin Perret , Suzuki K Poulose , Michael Roth , Mark Rutland , Fuad Tabba , Oliver Upton , Marc Zyngier , kernel-team@android.com, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH 35/89] KVM: arm64: Unmap kvm_arm_hyp_percpu_base from the host Date: Thu, 19 May 2022 14:41:10 +0100 Message-Id: <20220519134204.5379-36-will@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20220519134204.5379-1-will@kernel.org> References: <20220519134204.5379-1-will@kernel.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220519_064447_405460_1A63A8FC X-CRM114-Status: GOOD ( 13.97 ) 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 In pKVM mode, we can't trust the host not to mess with the hypervisor per-cpu offsets, so let's move the array containing them to the nVHE code. Signed-off-by: Quentin Perret --- arch/arm64/include/asm/kvm_asm.h | 4 ++-- arch/arm64/kernel/image-vars.h | 3 --- arch/arm64/kvm/arm.c | 9 ++++----- arch/arm64/kvm/hyp/nvhe/hyp-smp.c | 2 ++ 4 files changed, 8 insertions(+), 10 deletions(-) diff --git a/arch/arm64/include/asm/kvm_asm.h b/arch/arm64/include/asm/kvm_asm.h index 931a351da3f2..35b9d590bb74 100644 --- a/arch/arm64/include/asm/kvm_asm.h +++ b/arch/arm64/include/asm/kvm_asm.h @@ -110,7 +110,7 @@ enum __kvm_host_smccc_func { #define per_cpu_ptr_nvhe_sym(sym, cpu) \ ({ \ unsigned long base, off; \ - base = kvm_arm_hyp_percpu_base[cpu]; \ + base = kvm_nvhe_sym(kvm_arm_hyp_percpu_base)[cpu]; \ off = (unsigned long)&CHOOSE_NVHE_SYM(sym) - \ (unsigned long)&CHOOSE_NVHE_SYM(__per_cpu_start); \ base ? (typeof(CHOOSE_NVHE_SYM(sym))*)(base + off) : NULL; \ @@ -198,7 +198,7 @@ DECLARE_KVM_HYP_SYM(__kvm_hyp_vector); #define __kvm_hyp_init CHOOSE_NVHE_SYM(__kvm_hyp_init) #define __kvm_hyp_vector CHOOSE_HYP_SYM(__kvm_hyp_vector) -extern unsigned long kvm_arm_hyp_percpu_base[NR_CPUS]; +extern unsigned long kvm_nvhe_sym(kvm_arm_hyp_percpu_base)[]; DECLARE_KVM_NVHE_SYM(__per_cpu_start); DECLARE_KVM_NVHE_SYM(__per_cpu_end); diff --git a/arch/arm64/kernel/image-vars.h b/arch/arm64/kernel/image-vars.h index 4e3b6d618ac1..37a2d833851a 100644 --- a/arch/arm64/kernel/image-vars.h +++ b/arch/arm64/kernel/image-vars.h @@ -102,9 +102,6 @@ KVM_NVHE_ALIAS(gic_nonsecure_priorities); KVM_NVHE_ALIAS(__start___kvm_ex_table); KVM_NVHE_ALIAS(__stop___kvm_ex_table); -/* Array containing bases of nVHE per-CPU memory regions. */ -KVM_NVHE_ALIAS(kvm_arm_hyp_percpu_base); - /* PMU available static key */ #ifdef CONFIG_HW_PERF_EVENTS KVM_NVHE_ALIAS(kvm_arm_pmu_available); diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c index 5b41551a978b..c7b362db692f 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -51,7 +51,6 @@ DEFINE_STATIC_KEY_FALSE(kvm_protected_mode_initialized); DECLARE_KVM_HYP_PER_CPU(unsigned long, kvm_hyp_vector); static DEFINE_PER_CPU(unsigned long, kvm_arm_hyp_stack_page); -unsigned long kvm_arm_hyp_percpu_base[NR_CPUS]; DECLARE_KVM_NVHE_PER_CPU(struct kvm_nvhe_init_params, kvm_init_params); static bool vgic_present; @@ -1800,13 +1799,13 @@ static void teardown_hyp_mode(void) free_hyp_pgds(); for_each_possible_cpu(cpu) { free_page(per_cpu(kvm_arm_hyp_stack_page, cpu)); - free_pages(kvm_arm_hyp_percpu_base[cpu], nvhe_percpu_order()); + free_pages(kvm_nvhe_sym(kvm_arm_hyp_percpu_base)[cpu], nvhe_percpu_order()); } } static int do_pkvm_init(u32 hyp_va_bits) { - void *per_cpu_base = kvm_ksym_ref(kvm_arm_hyp_percpu_base); + void *per_cpu_base = kvm_ksym_ref(kvm_nvhe_sym(kvm_arm_hyp_percpu_base)); int ret; preempt_disable(); @@ -1907,7 +1906,7 @@ static int init_hyp_mode(void) page_addr = page_address(page); memcpy(page_addr, CHOOSE_NVHE_SYM(__per_cpu_start), nvhe_percpu_size()); - kvm_arm_hyp_percpu_base[cpu] = (unsigned long)page_addr; + kvm_nvhe_sym(kvm_arm_hyp_percpu_base)[cpu] = (unsigned long)page_addr; } /* @@ -1968,7 +1967,7 @@ static int init_hyp_mode(void) } for_each_possible_cpu(cpu) { - char *percpu_begin = (char *)kvm_arm_hyp_percpu_base[cpu]; + char *percpu_begin = (char *)kvm_nvhe_sym(kvm_arm_hyp_percpu_base)[cpu]; char *percpu_end = percpu_begin + nvhe_percpu_size(); /* Map Hyp percpu pages */ diff --git a/arch/arm64/kvm/hyp/nvhe/hyp-smp.c b/arch/arm64/kvm/hyp/nvhe/hyp-smp.c index 9f54833af400..04d194583f1e 100644 --- a/arch/arm64/kvm/hyp/nvhe/hyp-smp.c +++ b/arch/arm64/kvm/hyp/nvhe/hyp-smp.c @@ -23,6 +23,8 @@ u64 cpu_logical_map(unsigned int cpu) return hyp_cpu_logical_map[cpu]; } +unsigned long __ro_after_init kvm_arm_hyp_percpu_base[NR_CPUS]; + unsigned long __hyp_per_cpu_offset(unsigned int cpu) { unsigned long *cpu_base_array;