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=-12.8 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 2E3A8C5517A for ; Mon, 9 Nov 2020 21:47:58 +0000 (UTC) Received: from mm01.cs.columbia.edu (mm01.cs.columbia.edu [128.59.11.253]) by mail.kernel.org (Postfix) with ESMTP id 7B0E821D91 for ; Mon, 9 Nov 2020 21:47:57 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="KzEH2l+d" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7B0E821D91 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvmarm-bounces@lists.cs.columbia.edu Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 19D144BA5F; Mon, 9 Nov 2020 16:47:57 -0500 (EST) X-Virus-Scanned: at lists.cs.columbia.edu Authentication-Results: mm01.cs.columbia.edu (amavisd-new); dkim=softfail (fail, message has been altered) header.i=@kernel.org Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id aUAg+W5ubXEl; Mon, 9 Nov 2020 16:47:56 -0500 (EST) Received: from mm01.cs.columbia.edu (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 001D04BA5E; Mon, 9 Nov 2020 16:47:56 -0500 (EST) Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 1295E4BA3D for ; Mon, 9 Nov 2020 16:47:55 -0500 (EST) X-Virus-Scanned: at lists.cs.columbia.edu Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id wceqEmg9aNdj for ; Mon, 9 Nov 2020 16:47:54 -0500 (EST) Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by mm01.cs.columbia.edu (Postfix) with ESMTPS id BF9844BA55 for ; Mon, 9 Nov 2020 16:47:52 -0500 (EST) Received: from localhost.localdomain (236.31.169.217.in-addr.arpa [217.169.31.236]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id A7DBF20867; Mon, 9 Nov 2020 21:47:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1604958471; bh=MFg9BXXRYTYZhDaeasuySY495wVV2NgecH0He+KWY8g=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=KzEH2l+d388BsNFD0HfuRmOUV3zVvtctoUoEFBCgZRPtbbJX56qCQPneUScEyhNiq +Hu6LDGdI58sf5NtXCUN3wwyBwyt8UXxvzRTDiGLLWFSuoqnpeNGpixDWbwkT53YHK XEeqvfE7R/gTxxICcO1DOkF75rQeU0vMt4/jKbbw= From: Will Deacon To: kvmarm@lists.cs.columbia.edu Subject: [PATCH v2 5/9] KVM: arm64: Move BP hardening helpers into spectre.h Date: Mon, 9 Nov 2020 21:47:22 +0000 Message-Id: <20201109214726.15276-6-will@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20201109214726.15276-1-will@kernel.org> References: <20201109214726.15276-1-will@kernel.org> MIME-Version: 1.0 Cc: catalin.marinas@arm.com, kernel-team@android.com, Will Deacon , Marc Zyngier X-BeenThere: kvmarm@lists.cs.columbia.edu X-Mailman-Version: 2.1.14 Precedence: list List-Id: Where KVM/ARM decisions are made List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu The BP hardening helpers are an integral part of the Spectre-v2 mitigation, so move them into asm/spectre.h and inline the arm64_get_bp_hardening_data() function at the same time. Cc: Marc Zyngier Cc: Quentin Perret Signed-off-by: Will Deacon --- arch/arm64/include/asm/mmu.h | 29 ----------------------------- arch/arm64/include/asm/spectre.h | 30 ++++++++++++++++++++++++++++++ arch/arm64/kvm/arm.c | 2 +- arch/arm64/kvm/hyp/hyp-entry.S | 1 + 4 files changed, 32 insertions(+), 30 deletions(-) diff --git a/arch/arm64/include/asm/mmu.h b/arch/arm64/include/asm/mmu.h index b2e91c187e2a..75beffe2ee8a 100644 --- a/arch/arm64/include/asm/mmu.h +++ b/arch/arm64/include/asm/mmu.h @@ -12,9 +12,6 @@ #define USER_ASID_FLAG (UL(1) << USER_ASID_BIT) #define TTBR_ASID_MASK (UL(0xffff) << 48) -#define BP_HARDEN_EL2_SLOTS 4 -#define __BP_HARDEN_HYP_VECS_SZ (BP_HARDEN_EL2_SLOTS * SZ_2K) - #ifndef __ASSEMBLY__ #include @@ -41,32 +38,6 @@ static inline bool arm64_kernel_unmapped_at_el0(void) return cpus_have_const_cap(ARM64_UNMAP_KERNEL_AT_EL0); } -typedef void (*bp_hardening_cb_t)(void); - -struct bp_hardening_data { - int hyp_vectors_slot; - bp_hardening_cb_t fn; -}; - -DECLARE_PER_CPU_READ_MOSTLY(struct bp_hardening_data, bp_hardening_data); - -static inline struct bp_hardening_data *arm64_get_bp_hardening_data(void) -{ - return this_cpu_ptr(&bp_hardening_data); -} - -static inline void arm64_apply_bp_hardening(void) -{ - struct bp_hardening_data *d; - - if (!cpus_have_const_cap(ARM64_SPECTRE_V2)) - return; - - d = arm64_get_bp_hardening_data(); - if (d->fn) - d->fn(); -} - extern void arm64_memblock_init(void); extern void paging_init(void); extern void bootmem_init(void); diff --git a/arch/arm64/include/asm/spectre.h b/arch/arm64/include/asm/spectre.h index fcdfbce302bd..d22f8b7d9c50 100644 --- a/arch/arm64/include/asm/spectre.h +++ b/arch/arm64/include/asm/spectre.h @@ -9,7 +9,15 @@ #ifndef __ASM_SPECTRE_H #define __ASM_SPECTRE_H +#define BP_HARDEN_EL2_SLOTS 4 +#define __BP_HARDEN_HYP_VECS_SZ (BP_HARDEN_EL2_SLOTS * SZ_2K) + +#ifndef __ASSEMBLY__ + +#include + #include +#include /* Watch out, ordering is important here. */ enum mitigation_state { @@ -20,6 +28,27 @@ enum mitigation_state { struct task_struct; +typedef void (*bp_hardening_cb_t)(void); + +struct bp_hardening_data { + int hyp_vectors_slot; + bp_hardening_cb_t fn; +}; + +DECLARE_PER_CPU_READ_MOSTLY(struct bp_hardening_data, bp_hardening_data); + +static inline void arm64_apply_bp_hardening(void) +{ + struct bp_hardening_data *d; + + if (!cpus_have_const_cap(ARM64_SPECTRE_V2)) + return; + + d = this_cpu_ptr(&bp_hardening_data); + if (d->fn) + d->fn(); +} + enum mitigation_state arm64_get_spectre_v2_state(void); bool has_spectre_v2(const struct arm64_cpu_capabilities *cap, int scope); void spectre_v2_enable_mitigation(const struct arm64_cpu_capabilities *__unused); @@ -29,4 +58,5 @@ bool has_spectre_v4(const struct arm64_cpu_capabilities *cap, int scope); void spectre_v4_enable_mitigation(const struct arm64_cpu_capabilities *__unused); void spectre_v4_enable_task_mitigation(struct task_struct *tsk); +#endif /* __ASSEMBLY__ */ #endif /* __ASM_SPECTRE_H */ diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c index 3262c16f0449..044c5fc81f90 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -1405,7 +1405,7 @@ static void cpu_hyp_reset(void) */ static void cpu_set_hyp_vector(void) { - struct bp_hardening_data *data = arm64_get_bp_hardening_data(); + struct bp_hardening_data *data = this_cpu_ptr(&bp_hardening_data); void *vect = kern_hyp_va(kvm_ksym_ref(__kvm_hyp_vector)); int slot = -1; diff --git a/arch/arm64/kvm/hyp/hyp-entry.S b/arch/arm64/kvm/hyp/hyp-entry.S index 0a5b36eb54b3..874eacdabc64 100644 --- a/arch/arm64/kvm/hyp/hyp-entry.S +++ b/arch/arm64/kvm/hyp/hyp-entry.S @@ -13,6 +13,7 @@ #include #include #include +#include .macro save_caller_saved_regs_vect /* x0 and x1 were saved in the vector entry */ -- 2.29.2.222.g5d2a92d10f8-goog _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm