From patchwork Wed Oct 11 07:26:54 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jinjie Ruan X-Patchwork-Id: 13416774 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 7D726CD98F5 for ; Wed, 11 Oct 2023 07:29:01 +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=+lM3p95msdQlLzWLNcNLbTPXeRCvBNRN15Y9S/bVdTE=; b=XeoAcapgZmSB0c dtAq6UQQuTo5MP/kLCN4Bnc6zDl+tQOyUioFXw0ZKXrT/escW8xfO4SL8MYsACpsZVx0k/svIHboo seq6tFxKuV3fi0BRP8SG9i7buKRDrSA3/aixwAYi7m/exsFBzWNJKxXvaY+Z5IfcaVIeh2QzlBWEq 2jNoXnuyYV3PDRivfvm4tGXBCV0KeUWwBdU25dGyVGGRQMGTqF1RIprorhVkE4LUATQkDlMc3/OUX jmC4fPhL9l+zuJEP9S5WSM//CGbDJfBUbfkCsLs3Sk2rHWlq8up4teoKZLTrY2tA1OQO3Tjetk7f+ Y3GcIK3G9TRtRRIH3oaQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1qqTdm-00F5Q6-31; Wed, 11 Oct 2023 07:28:22 +0000 Received: from szxga02-in.huawei.com ([45.249.212.188]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1qqTdY-00F5Ff-2d for linux-arm-kernel@lists.infradead.org; Wed, 11 Oct 2023 07:28:13 +0000 Received: from kwepemi500008.china.huawei.com (unknown [172.30.72.55]) by szxga02-in.huawei.com (SkyGuard) with ESMTP id 4S545q6Y5FzVlXw; Wed, 11 Oct 2023 15:24:31 +0800 (CST) Received: from huawei.com (10.67.174.55) by kwepemi500008.china.huawei.com (7.221.188.139) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.31; Wed, 11 Oct 2023 15:28:00 +0800 From: Jinjie Ruan To: , , , , , , , , , , , , , , , , , , CC: Subject: [PATCH v5.10 08/15] arm64: factor out EL1 SSBS emulation hook Date: Wed, 11 Oct 2023 07:26:54 +0000 Message-ID: <20231011072701.876772-9-ruanjinjie@huawei.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231011072701.876772-1-ruanjinjie@huawei.com> References: <20231011072701.876772-1-ruanjinjie@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.67.174.55] X-ClientProxiedBy: dggems706-chm.china.huawei.com (10.3.19.183) To kwepemi500008.china.huawei.com (7.221.188.139) X-CFilter-Loop: Reflected X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20231011_002809_298689_393B2D89 X-CRM114-Status: GOOD ( 17.93 ) 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: Mark Rutland Currently call_undef_hook() is used to handle UNDEFINED exceptions from EL0 and EL1. As support for deprecated instructions may be enabled independently, the handlers for individual instructions are organised as a linked list of struct undef_hook which can be manipulated dynamically. As this can be manipulated dynamically, the list is protected with a raw_spinlock which must be acquired when handling UNDEFINED exceptions or when manipulating the list of handlers. This locking is unfortunate as it serialises handling of UNDEFINED exceptions, and requires RCU to be enabled for lockdep, requiring the use of RCU_NONIDLE() in resume path of cpu_suspend() since commit: a2c42bbabbe260b7 ("arm64: spectre: Prevent lockdep splat on v4 mitigation enable path") The list of UNDEFINED handlers largely consist of handlers for exceptions taken from EL0, and the only handler for exceptions taken from EL1 handles `MSR SSBS, #imm` on CPUs which feature PSTATE.SSBS but lack the corresponding MSR (Immediate) instruction. Other than this we never expect to take an UNDEFINED exception from EL1 in normal operation. This patch reworks do_el0_undef() to invoke the EL1 SSBS handler directly, relegating call_undef_hook() to only handle EL0 UNDEFs. This removes redundant work to iterate the list for EL1 UNDEFs, and removes the need for locking, permitting EL1 UNDEFs to be handled in parallel without contention. The RCU_NONIDLE() call in cpu_suspend() will be removed in a subsequent patch, as there are other potential issues with the use of instrumentable code and RCU in the CPU suspend code. I've tested this by forcing the detection of SSBS on a CPU that doesn't have it, and verifying that the try_emulate_el1_ssbs() callback is invoked. Signed-off-by: Mark Rutland Cc: Catalin Marinas Cc: James Morse Cc: Joey Gouly Cc: Peter Zijlstra Cc: Will Deacon Link: https://lore.kernel.org/r/20221019144123.612388-4-mark.rutland@arm.com Signed-off-by: Will Deacon --- arch/arm64/include/asm/spectre.h | 2 ++ arch/arm64/kernel/proton-pack.c | 26 +++++++------------------- arch/arm64/kernel/traps.c | 15 ++++++++------- 3 files changed, 17 insertions(+), 26 deletions(-) diff --git a/arch/arm64/include/asm/spectre.h b/arch/arm64/include/asm/spectre.h index 4b3a5f050f71..e48afcb69392 100644 --- a/arch/arm64/include/asm/spectre.h +++ b/arch/arm64/include/asm/spectre.h @@ -18,6 +18,7 @@ enum mitigation_state { SPECTRE_VULNERABLE, }; +struct pt_regs; struct task_struct; enum mitigation_state arm64_get_spectre_v2_state(void); @@ -33,4 +34,5 @@ enum mitigation_state arm64_get_spectre_bhb_state(void); bool is_spectre_bhb_affected(const struct arm64_cpu_capabilities *entry, int scope); u8 spectre_bhb_loop_affected(int scope); void spectre_bhb_enable_mitigation(const struct arm64_cpu_capabilities *__unused); +bool try_emulate_el1_ssbs(struct pt_regs *regs, u32 instr); #endif /* __ASM_SPECTRE_H */ diff --git a/arch/arm64/kernel/proton-pack.c b/arch/arm64/kernel/proton-pack.c index faa8a6bf2376..9c0e9d9eed6e 100644 --- a/arch/arm64/kernel/proton-pack.c +++ b/arch/arm64/kernel/proton-pack.c @@ -537,10 +537,13 @@ bool has_spectre_v4(const struct arm64_cpu_capabilities *cap, int scope) return state != SPECTRE_UNAFFECTED; } -static int ssbs_emulation_handler(struct pt_regs *regs, u32 instr) +bool try_emulate_el1_ssbs(struct pt_regs *regs, u32 instr) { - if (user_mode(regs)) - return 1; + const u32 instr_mask = ~(1U << PSTATE_Imm_shift); + const u32 instr_val = 0xd500401f | PSTATE_SSBS; + + if ((instr & instr_mask) != instr_val) + return false; if (instr & BIT(PSTATE_Imm_shift)) regs->pstate |= PSR_SSBS_BIT; @@ -548,19 +551,11 @@ static int ssbs_emulation_handler(struct pt_regs *regs, u32 instr) regs->pstate &= ~PSR_SSBS_BIT; arm64_skip_faulting_instruction(regs, 4); - return 0; + return true; } -static struct undef_hook ssbs_emulation_hook = { - .instr_mask = ~(1U << PSTATE_Imm_shift), - .instr_val = 0xd500401f | PSTATE_SSBS, - .fn = ssbs_emulation_handler, -}; - static enum mitigation_state spectre_v4_enable_hw_mitigation(void) { - static bool undef_hook_registered = false; - static DEFINE_RAW_SPINLOCK(hook_lock); enum mitigation_state state; /* @@ -571,13 +566,6 @@ static enum mitigation_state spectre_v4_enable_hw_mitigation(void) if (state != SPECTRE_MITIGATED || !this_cpu_has_cap(ARM64_SSBS)) return state; - raw_spin_lock(&hook_lock); - if (!undef_hook_registered) { - register_undef_hook(&ssbs_emulation_hook); - undef_hook_registered = true; - } - raw_spin_unlock(&hook_lock); - if (spectre_v4_mitigations_off()) { sysreg_clear_set(sctlr_el1, 0, SCTLR_ELx_DSSBS); asm volatile(SET_PSTATE_SSBS(1)); diff --git a/arch/arm64/kernel/traps.c b/arch/arm64/kernel/traps.c index a2dfce6493d2..15d490ef7462 100644 --- a/arch/arm64/kernel/traps.c +++ b/arch/arm64/kernel/traps.c @@ -311,12 +311,7 @@ static int call_undef_hook(struct pt_regs *regs) int (*fn)(struct pt_regs *regs, u32 instr) = NULL; void __user *pc = (void __user *)instruction_pointer(regs); - if (!user_mode(regs)) { - __le32 instr_le; - if (get_kernel_nofault(instr_le, (__force __le32 *)pc)) - goto exit; - instr = le32_to_cpu(instr_le); - } else if (compat_thumb_mode(regs)) { + if (compat_thumb_mode(regs)) { /* 16-bit Thumb instruction */ __le16 instr_le; if (get_user(instr_le, (__le16 __user *)pc)) @@ -409,9 +404,15 @@ void do_el0_undef(struct pt_regs *regs, unsigned long esr) void do_el1_undef(struct pt_regs *regs, unsigned long esr) { - if (call_undef_hook(regs) == 0) + u32 insn; + + if (aarch64_insn_read((void *)regs->pc, &insn)) + goto out_err; + + if (try_emulate_el1_ssbs(regs, insn)) return; +out_err: die("Oops - Undefined instruction", regs, esr); }