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 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id DF514C433F5 for ; Mon, 18 Oct 2021 15:33:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BB0A66103D for ; Mon, 18 Oct 2021 15:33:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232985AbhJRPfr (ORCPT ); Mon, 18 Oct 2021 11:35:47 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36050 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231905AbhJRPfp (ORCPT ); Mon, 18 Oct 2021 11:35:45 -0400 Received: from mail-lf1-x133.google.com (mail-lf1-x133.google.com [IPv6:2a00:1450:4864:20::133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E3EAEC06161C for ; Mon, 18 Oct 2021 08:33:33 -0700 (PDT) Received: by mail-lf1-x133.google.com with SMTP id y26so499091lfa.11 for ; Mon, 18 Oct 2021 08:33:33 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=shutemov-name.20210112.gappssmtp.com; s=20210112; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=3x1+MDGvGnzeKyu00j6KECfd2YR8Bl5CJG6uJH0f6mM=; b=FUkKanmIp19bdjB/r8+hSd3nTJpdtG5Dm86reEGNs/RR+Nv9D+qpgUrQ4OG54WXPHu zNt2PARDDRSkNMF0ZByBdyWTJPuvdjWH8tjXyFHC0StO9vszwLH7qMa+EmqQ0ylfDxZm YKchAHPDpMwdHMDFmbeOg7tz+oRljjIC4o2hp/44W/wUzjRK8hChNnHN1ZVZDSD48YsQ nG7u9UNVXq4KQ+u8GQxBISqvXXSpRpFzbjlegugQwZJ7smY7BzOqsQl1nHQS9UtFvEJ1 j4tEyP98SX/Qy0CcXpQfqiSoZTd/tGHcb66/NyobzidsHjq5vf91a2qAAGsFf77qgZqX m7qA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=3x1+MDGvGnzeKyu00j6KECfd2YR8Bl5CJG6uJH0f6mM=; b=7ZKLl4R1XgFGFcp/UpUAykxMUiAeOzaICACguxipwzZSVl1XjT+nhucVivhRAkNXe1 Q7Z+ccVNZyYk8xI+soPDs5UgtPWWfvBs78GlHfAgMM7WoXWwCGPfhl7vH9OAL9d65YHe 5bDxfjJJMGM4688cDsnF2u4ScPVAWj43OZgAXr1tIChcyQixWM5ijPH5kl2IDWpSDstE 1ZDR/ygfr316P15ytK48nEaWFmIu2F1Kc3VepUfQmQDiY0VXq7rI/ZX8Q/1abpbuBHsC 3vev2YsOATJPVeaf48PCZhJpaJ38MhYbWV2rJ75hluHz4lvSuKT6HJRvoulI95isn0cw e8gw== X-Gm-Message-State: AOAM530cdZmRuNmiSYwOYAdN1Fd4M1JMBD7gVmhIK+dM+g27qwjfhoK3 UB5IOvd5PQAktxS7+bGRMc3MEA== X-Google-Smtp-Source: ABdhPJzOb65hWgq5EdUKNqcE/WHjCoXOFMR4dTjS/DR6DKwMLp1MWELbwStfm6xs3DQLPpHvFxh+PA== X-Received: by 2002:ac2:4c49:: with SMTP id o9mr452127lfk.482.1634571212301; Mon, 18 Oct 2021 08:33:32 -0700 (PDT) Received: from box.localdomain ([86.57.175.117]) by smtp.gmail.com with ESMTPSA id d27sm1681326ljo.15.2021.10.18.08.33.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 18 Oct 2021 08:33:31 -0700 (PDT) From: "Kirill A. Shutemov" X-Google-Original-From: "Kirill A. Shutemov" Received: by box.localdomain (Postfix, from userid 1000) id 131E2103091; Mon, 18 Oct 2021 18:33:35 +0300 (+03) To: Thomas Gleixner , Ingo Molnar , Borislav Petkov , Tom Lendacky , Joerg Roedel Cc: Kuppuswamy Sathyanarayanan , Andi Kleen , Dave Hansen , Sean Christopherson , x86@kernel.org, linux-kernel@vger.kernel.org, "Kirill A. Shutemov" , Tony Luck Subject: [PATCH 1/3] x86/insn-eval: Introduce insn_get_modrm_reg_ptr() Date: Mon, 18 Oct 2021 18:33:31 +0300 Message-Id: <20211018153333.8261-2-kirill.shutemov@linux.intel.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20211018153333.8261-1-kirill.shutemov@linux.intel.com> References: <20211018153333.8261-1-kirill.shutemov@linux.intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The helper returns a pointer to the register indicated by ModRM byte. It's going to replace vc_insn_get_reg() in the SEV MMIO implementation. TDX MMIO implementation will also use it. Signed-off-by: Kirill A. Shutemov Reviewed-by: Andi Kleen Reviewed-by: Tony Luck --- arch/x86/include/asm/insn-eval.h | 1 + arch/x86/lib/insn-eval.c | 20 ++++++++++++++++++++ 2 files changed, 21 insertions(+) diff --git a/arch/x86/include/asm/insn-eval.h b/arch/x86/include/asm/insn-eval.h index 91d7182ad2d6..041f399153b9 100644 --- a/arch/x86/include/asm/insn-eval.h +++ b/arch/x86/include/asm/insn-eval.h @@ -19,6 +19,7 @@ bool insn_has_rep_prefix(struct insn *insn); void __user *insn_get_addr_ref(struct insn *insn, struct pt_regs *regs); int insn_get_modrm_rm_off(struct insn *insn, struct pt_regs *regs); int insn_get_modrm_reg_off(struct insn *insn, struct pt_regs *regs); +void *insn_get_modrm_reg_ptr(struct insn *insn, struct pt_regs *regs); unsigned long insn_get_seg_base(struct pt_regs *regs, int seg_reg_idx); int insn_get_code_seg_params(struct pt_regs *regs); int insn_fetch_from_user(struct pt_regs *regs, diff --git a/arch/x86/lib/insn-eval.c b/arch/x86/lib/insn-eval.c index a1d24fdc07cf..fbaa3fa24bde 100644 --- a/arch/x86/lib/insn-eval.c +++ b/arch/x86/lib/insn-eval.c @@ -850,6 +850,26 @@ int insn_get_modrm_reg_off(struct insn *insn, struct pt_regs *regs) return get_reg_offset(insn, regs, REG_TYPE_REG); } +/** + * insn_get_modrm_reg_ptr() - Obtain register pointer based on ModRM byte + * @insn: Instruction containing the ModRM byte + * @regs: Register values as seen when entering kernel mode + * + * Returns: + * + * The register indicated by the reg part of the ModRM byte. + * The register is obtained as a pointer within pt_regs. + */ +void *insn_get_modrm_reg_ptr(struct insn *insn, struct pt_regs *regs) +{ + int offset; + + offset = insn_get_modrm_reg_off(insn, regs); + if (offset < 0) + return NULL; + return (void *)regs + offset; +} + /** * get_seg_base_limit() - obtain base address and limit of a segment * @insn: Instruction. Must be valid. -- 2.32.0