From patchwork Wed Aug 5 17:56:22 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Marc Zyngier X-Patchwork-Id: 11702299 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id A6D8B1392 for ; Wed, 5 Aug 2020 18:55:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8AE0023600 for ; Wed, 5 Aug 2020 18:55:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1596653747; bh=YNx+MeMmTTjRzZ24xWo3RQozCg4nqRaUJD7bFD4D/Y4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=dp0XSM6WlR6bZ8eS0+yqDXhKQWkwEUAZ5pUre+Bb8LLKDikSiSaYX8vcnMhK1rnse M4rNslkYJ14SYsLrelOv7HDjrPi+/T/2ErHMThCvJsPygpa54y0ekr2MNkDRySefw5 RRTUdpg8rqmghhCZX2/iTR4kE7p43SftbXnhUyzA= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728535AbgHESyz (ORCPT ); Wed, 5 Aug 2020 14:54:55 -0400 Received: from mail.kernel.org ([198.145.29.99]:34570 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729245AbgHESaU (ORCPT ); Wed, 5 Aug 2020 14:30:20 -0400 Received: from disco-boy.misterjones.org (disco-boy.misterjones.org [51.254.78.96]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 1F64C22DD6; Wed, 5 Aug 2020 18:26:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1596652016; bh=YNx+MeMmTTjRzZ24xWo3RQozCg4nqRaUJD7bFD4D/Y4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=1iZ7K8K17r8tKk1+frGArAsTH2WorTxUUIqPBRQwDtFcPTY8MWAKbqNSWNN8FfEGv PoL1Dec9p33eJdbtNZPfIXJCnJBdX9CzxTpuhj83JHdCvOklX49LpH6n/L1q21SIce QW0RnImHkGqL/tR2+yEbMbg8xLy0FS2U9gXKnBBY= Received: from 78.163-31-62.static.virginmediabusiness.co.uk ([62.31.163.78] helo=why.lan) by disco-boy.misterjones.org with esmtpsa (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1k3NfS-0004w9-0v; Wed, 05 Aug 2020 18:57:34 +0100 From: Marc Zyngier To: Paolo Bonzini Cc: Alexander Graf , Alexandru Elisei , Andrew Scull , Catalin Marinas , Christoffer Dall , David Brazdil , Eric Auger , Gavin Shan , James Morse , Mark Rutland , Peng Hao , Quentin Perret , Will Deacon , Julien Thierry , Suzuki K Poulose , linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org, kernel-team@android.com Subject: [PATCH 18/56] KVM: arm64: Build hyp-entry.S separately for VHE/nVHE Date: Wed, 5 Aug 2020 18:56:22 +0100 Message-Id: <20200805175700.62775-19-maz@kernel.org> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20200805175700.62775-1-maz@kernel.org> References: <20200805175700.62775-1-maz@kernel.org> MIME-Version: 1.0 X-SA-Exim-Connect-IP: 62.31.163.78 X-SA-Exim-Rcpt-To: pbonzini@redhat.com, graf@amazon.com, alexandru.elisei@arm.com, ascull@google.com, catalin.marinas@arm.com, christoffer.dall@arm.com, dbrazdil@google.com, eric.auger@redhat.com, gshan@redhat.com, james.morse@arm.com, mark.rutland@arm.com, richard.peng@oppo.com, qperret@google.com, will@kernel.org, julien.thierry.kdev@gmail.com, suzuki.poulose@arm.com, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org, kernel-team@android.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org From: David Brazdil hyp-entry.S contains implementation of KVM hyp vectors. This code is mostly shared between VHE/nVHE, therefore compile it under both VHE and nVHE build rules. nVHE-specific host HVC handler is hidden behind __KVM_NVHE_HYPERVISOR__. Adjust code which selects which KVM hyp vecs to install to choose the correct VHE/nVHE symbol. Signed-off-by: David Brazdil Signed-off-by: Marc Zyngier Link: https://lore.kernel.org/r/20200625131420.71444-7-dbrazdil@google.com --- arch/arm64/include/asm/kvm_asm.h | 22 +++++++++++++++++----- arch/arm64/include/asm/mmu.h | 7 ------- arch/arm64/kernel/image-vars.h | 24 ++++++++++++++++++++++++ arch/arm64/kvm/arm.c | 2 +- arch/arm64/kvm/hyp/Makefile | 4 ++-- arch/arm64/kvm/hyp/hyp-entry.S | 2 ++ arch/arm64/kvm/hyp/nvhe/Makefile | 2 +- arch/arm64/kvm/hyp/vhe/Makefile | 2 +- 8 files changed, 48 insertions(+), 17 deletions(-) diff --git a/arch/arm64/include/asm/kvm_asm.h b/arch/arm64/include/asm/kvm_asm.h index 6a682d66a640..6026cbd204ae 100644 --- a/arch/arm64/include/asm/kvm_asm.h +++ b/arch/arm64/include/asm/kvm_asm.h @@ -60,12 +60,17 @@ DECLARE_KVM_VHE_SYM(sym); \ DECLARE_KVM_NVHE_SYM(sym) -/* Translate a kernel address of @sym into its equivalent linear mapping */ -#define kvm_ksym_ref(sym) \ +#define CHOOSE_VHE_SYM(sym) sym +#define CHOOSE_NVHE_SYM(sym) kvm_nvhe_sym(sym) +#define CHOOSE_HYP_SYM(sym) (has_vhe() ? CHOOSE_VHE_SYM(sym) \ + : CHOOSE_NVHE_SYM(sym)) + +/* Translate a kernel address @ptr into its equivalent linear mapping */ +#define kvm_ksym_ref(ptr) \ ({ \ - void *val = &sym; \ + void *val = (ptr); \ if (!is_kernel_in_hyp_mode()) \ - val = lm_alias(&sym); \ + val = lm_alias((ptr)); \ val; \ }) #define kvm_ksym_ref_nvhe(sym) kvm_ksym_ref(kvm_nvhe_sym(sym)) @@ -76,7 +81,14 @@ struct kvm_vcpu; extern char __kvm_hyp_init[]; extern char __kvm_hyp_init_end[]; -extern char __kvm_hyp_vector[]; +DECLARE_KVM_HYP_SYM(__kvm_hyp_vector); +#define __kvm_hyp_vector CHOOSE_HYP_SYM(__kvm_hyp_vector) + +#ifdef CONFIG_KVM_INDIRECT_VECTORS +extern atomic_t arm64_el2_vector_last_slot; +DECLARE_KVM_HYP_SYM(__bp_harden_hyp_vecs); +#define __bp_harden_hyp_vecs CHOOSE_HYP_SYM(__bp_harden_hyp_vecs) +#endif extern void __kvm_flush_vm_context(void); extern void __kvm_tlb_flush_vmid_ipa(struct kvm *kvm, phys_addr_t ipa); diff --git a/arch/arm64/include/asm/mmu.h b/arch/arm64/include/asm/mmu.h index 8444df000181..a7a5ecaa2e83 100644 --- a/arch/arm64/include/asm/mmu.h +++ b/arch/arm64/include/asm/mmu.h @@ -45,13 +45,6 @@ struct bp_hardening_data { bp_hardening_cb_t fn; }; -#if (defined(CONFIG_HARDEN_BRANCH_PREDICTOR) || \ - defined(CONFIG_HARDEN_EL2_VECTORS)) - -extern char __bp_harden_hyp_vecs[]; -extern atomic_t arm64_el2_vector_last_slot; -#endif /* CONFIG_HARDEN_BRANCH_PREDICTOR || CONFIG_HARDEN_EL2_VECTORS */ - #ifdef CONFIG_HARDEN_BRANCH_PREDICTOR DECLARE_PER_CPU_READ_MOSTLY(struct bp_hardening_data, bp_hardening_data); diff --git a/arch/arm64/kernel/image-vars.h b/arch/arm64/kernel/image-vars.h index 36444bac6a05..f28da486b75a 100644 --- a/arch/arm64/kernel/image-vars.h +++ b/arch/arm64/kernel/image-vars.h @@ -66,8 +66,17 @@ __efistub__ctype = _ctype; /* Symbols defined in debug-sr.c (not yet compiled with nVHE build rules). */ KVM_NVHE_ALIAS(__kvm_get_mdcr_el2); +/* Symbols defined in entry.S (not yet compiled with nVHE build rules). */ +KVM_NVHE_ALIAS(__guest_exit); +KVM_NVHE_ALIAS(abort_guest_exit_end); +KVM_NVHE_ALIAS(abort_guest_exit_start); + +/* Symbols defined in hyp-init.S (not yet compiled with nVHE build rules). */ +KVM_NVHE_ALIAS(__kvm_handle_stub_hvc); + /* Symbols defined in switch.c (not yet compiled with nVHE build rules). */ KVM_NVHE_ALIAS(__kvm_vcpu_run_nvhe); +KVM_NVHE_ALIAS(hyp_panic); /* Symbols defined in sysreg-sr.c (not yet compiled with nVHE build rules). */ KVM_NVHE_ALIAS(__kvm_enable_ssbs); @@ -89,6 +98,21 @@ KVM_NVHE_ALIAS(__vgic_v3_restore_aprs); KVM_NVHE_ALIAS(__vgic_v3_save_aprs); KVM_NVHE_ALIAS(__vgic_v3_write_vmcr); +/* Alternative callbacks for init-time patching of nVHE hyp code. */ +KVM_NVHE_ALIAS(arm64_enable_wa2_handling); +KVM_NVHE_ALIAS(kvm_patch_vector_branch); +KVM_NVHE_ALIAS(kvm_update_va_mask); + +/* Global kernel state accessed by nVHE hyp code. */ +KVM_NVHE_ALIAS(arm64_ssbd_callback_required); +KVM_NVHE_ALIAS(kvm_host_data); + +/* Kernel constant needed to compute idmap addresses. */ +KVM_NVHE_ALIAS(kimage_voffset); + +/* Kernel symbols used to call panic() from nVHE hyp code (via ERET). */ +KVM_NVHE_ALIAS(panic); + #endif /* CONFIG_KVM */ #endif /* __ARM64_KERNEL_IMAGE_VARS_H */ diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c index 90cb90561446..34b551385153 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -1285,7 +1285,7 @@ static void cpu_init_hyp_mode(void) * so that we can use adr_l to access per-cpu variables in EL2. */ tpidr_el2 = ((unsigned long)this_cpu_ptr(&kvm_host_data) - - (unsigned long)kvm_ksym_ref(kvm_host_data)); + (unsigned long)kvm_ksym_ref(&kvm_host_data)); pgd_ptr = kvm_mmu_get_httbr(); hyp_stack_ptr = __this_cpu_read(kvm_arm_hyp_stack_page) + PAGE_SIZE; diff --git a/arch/arm64/kvm/hyp/Makefile b/arch/arm64/kvm/hyp/Makefile index 9c5dfe6ff80b..8b0cf85080b5 100644 --- a/arch/arm64/kvm/hyp/Makefile +++ b/arch/arm64/kvm/hyp/Makefile @@ -10,11 +10,11 @@ subdir-ccflags-y := -I$(incdir) \ -DDISABLE_BRANCH_PROFILING \ $(DISABLE_STACKLEAK_PLUGIN) -obj-$(CONFIG_KVM) += hyp.o nvhe/ +obj-$(CONFIG_KVM) += hyp.o vhe/ nvhe/ obj-$(CONFIG_KVM_INDIRECT_VECTORS) += smccc_wa.o hyp-y := vgic-v3-sr.o timer-sr.o aarch32.o vgic-v2-cpuif-proxy.o sysreg-sr.o \ - debug-sr.o entry.o switch.o fpsimd.o tlb.o hyp-entry.o + debug-sr.o entry.o switch.o fpsimd.o tlb.o # KVM code is run at a different exception code with a different map, so # compiler instrumentation that inserts callbacks or checks into the code may diff --git a/arch/arm64/kvm/hyp/hyp-entry.S b/arch/arm64/kvm/hyp/hyp-entry.S index d362fad97cc8..7e3c72fa634f 100644 --- a/arch/arm64/kvm/hyp/hyp-entry.S +++ b/arch/arm64/kvm/hyp/hyp-entry.S @@ -40,6 +40,7 @@ el1_sync: // Guest trapped into EL2 ccmp x0, #ESR_ELx_EC_HVC32, #4, ne b.ne el1_trap +#ifdef __KVM_NVHE_HYPERVISOR__ mrs x1, vttbr_el2 // If vttbr is valid, the guest cbnz x1, el1_hvc_guest // called HVC @@ -74,6 +75,7 @@ el1_sync: // Guest trapped into EL2 eret sb +#endif /* __KVM_NVHE_HYPERVISOR__ */ el1_hvc_guest: /* diff --git a/arch/arm64/kvm/hyp/nvhe/Makefile b/arch/arm64/kvm/hyp/nvhe/Makefile index 955f4188e00f..79eb8eed96a1 100644 --- a/arch/arm64/kvm/hyp/nvhe/Makefile +++ b/arch/arm64/kvm/hyp/nvhe/Makefile @@ -6,7 +6,7 @@ asflags-y := -D__KVM_NVHE_HYPERVISOR__ ccflags-y := -D__KVM_NVHE_HYPERVISOR__ -obj-y := +obj-y := ../hyp-entry.o obj-y := $(patsubst %.o,%.hyp.o,$(obj-y)) extra-y := $(patsubst %.hyp.o,%.hyp.tmp.o,$(obj-y)) diff --git a/arch/arm64/kvm/hyp/vhe/Makefile b/arch/arm64/kvm/hyp/vhe/Makefile index e04375546081..323029e02b4e 100644 --- a/arch/arm64/kvm/hyp/vhe/Makefile +++ b/arch/arm64/kvm/hyp/vhe/Makefile @@ -6,7 +6,7 @@ asflags-y := -D__KVM_VHE_HYPERVISOR__ ccflags-y := -D__KVM_VHE_HYPERVISOR__ -obj-y := +obj-y := ../hyp-entry.o # KVM code is run at a different exception code with a different map, so # compiler instrumentation that inserts callbacks or checks into the code may