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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,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 0896DC4743D for ; Tue, 8 Jun 2021 16:00:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DAED861352 for ; Tue, 8 Jun 2021 16:00:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233491AbhFHQCF (ORCPT ); Tue, 8 Jun 2021 12:02:05 -0400 Received: from mga14.intel.com ([192.55.52.115]:60386 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233032AbhFHQBv (ORCPT ); Tue, 8 Jun 2021 12:01:51 -0400 IronPort-SDR: LXkIwAVNnX9LpAmEC4d6sl7pqfJhs7uRDX9TdMYtBE/jelGg6kKjSMrauGVbsvsrWuB9anftTW sPfIimnjRp4A== X-IronPort-AV: E=McAfee;i="6200,9189,10009"; a="204688355" X-IronPort-AV: E=Sophos;i="5.83,258,1616482800"; d="scan'208";a="204688355" Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 08 Jun 2021 08:59:58 -0700 IronPort-SDR: KSsn3jzOpxYheTJMFGuDO87A/DUC7iRlVPdmh9veo62HdNPwTXLtD6gsVigOz5fj9swjpilILL uBAOUwgm9ZPA== X-IronPort-AV: E=Sophos;i="5.83,258,1616482800"; d="scan'208";a="637683407" Received: from ticela-az-103.amr.corp.intel.com (HELO skuppusw-desk1.amr.corp.intel.com) ([10.254.36.77]) by fmsmga005-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 08 Jun 2021 08:59:57 -0700 From: Kuppuswamy Sathyanarayanan To: Peter Zijlstra , Andy Lutomirski , Dave Hansen , Tony Luck , Dan Williams Cc: Andi Kleen , Kirill Shutemov , Kuppuswamy Sathyanarayanan , Raj Ashok , Sean Christopherson , linux-kernel@vger.kernel.org, Tom Lendacky , Joerg Roedel , Kuppuswamy Sathyanarayanan Subject: [RFC v2-fix-v3 3/4] x86/sev-es: Use insn_decode_mmio() for MMIO implementation Date: Tue, 8 Jun 2021 08:59:23 -0700 Message-Id: X-Mailer: git-send-email 2.25.1 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: "Kirill A. Shutemov" Switch SEV implementation to insn_decode_mmio(). The helper is going to be used by TDX too. No functional changes. It is only build-tested. Signed-off-by: Kirill A. Shutemov Cc: Tom Lendacky Cc: Joerg Roedel Signed-off-by: Kuppuswamy Sathyanarayanan --- arch/x86/kernel/sev.c | 171 ++++++++++-------------------------------- 1 file changed, 40 insertions(+), 131 deletions(-) diff --git a/arch/x86/kernel/sev.c b/arch/x86/kernel/sev.c index c6b0ee3e2345..cdb5c453e21c 100644 --- a/arch/x86/kernel/sev.c +++ b/arch/x86/kernel/sev.c @@ -790,22 +790,6 @@ static void __init vc_early_forward_exception(struct es_em_ctxt *ctxt) do_early_exception(ctxt->regs, trapnr); } -static long *vc_insn_get_reg(struct es_em_ctxt *ctxt) -{ - long *reg_array; - int offset; - - reg_array = (long *)ctxt->regs; - offset = insn_get_modrm_reg_off(&ctxt->insn, ctxt->regs); - - if (offset < 0) - return NULL; - - offset /= sizeof(long); - - return reg_array + offset; -} - static long *vc_insn_get_rm(struct es_em_ctxt *ctxt) { long *reg_array; @@ -853,76 +837,6 @@ static enum es_result vc_do_mmio(struct ghcb *ghcb, struct es_em_ctxt *ctxt, return sev_es_ghcb_hv_call(ghcb, ctxt, exit_code, exit_info_1, exit_info_2); } -static enum es_result vc_handle_mmio_twobyte_ops(struct ghcb *ghcb, - struct es_em_ctxt *ctxt) -{ - struct insn *insn = &ctxt->insn; - unsigned int bytes = 0; - enum es_result ret; - int sign_byte; - long *reg_data; - - switch (insn->opcode.bytes[1]) { - /* MMIO Read w/ zero-extension */ - case 0xb6: - bytes = 1; - fallthrough; - case 0xb7: - if (!bytes) - bytes = 2; - - ret = vc_do_mmio(ghcb, ctxt, bytes, true); - if (ret) - break; - - /* Zero extend based on operand size */ - reg_data = vc_insn_get_reg(ctxt); - if (!reg_data) - return ES_DECODE_FAILED; - - memset(reg_data, 0, insn->opnd_bytes); - - memcpy(reg_data, ghcb->shared_buffer, bytes); - break; - - /* MMIO Read w/ sign-extension */ - case 0xbe: - bytes = 1; - fallthrough; - case 0xbf: - if (!bytes) - bytes = 2; - - ret = vc_do_mmio(ghcb, ctxt, bytes, true); - if (ret) - break; - - /* Sign extend based on operand size */ - reg_data = vc_insn_get_reg(ctxt); - if (!reg_data) - return ES_DECODE_FAILED; - - if (bytes == 1) { - u8 *val = (u8 *)ghcb->shared_buffer; - - sign_byte = (*val & 0x80) ? 0xff : 0x00; - } else { - u16 *val = (u16 *)ghcb->shared_buffer; - - sign_byte = (*val & 0x8000) ? 0xff : 0x00; - } - memset(reg_data, sign_byte, insn->opnd_bytes); - - memcpy(reg_data, ghcb->shared_buffer, bytes); - break; - - default: - ret = ES_UNSUPPORTED; - } - - return ret; -} - /* * The MOVS instruction has two memory operands, which raises the * problem that it is not known whether the access to the source or the @@ -990,83 +904,78 @@ static enum es_result vc_handle_mmio_movs(struct es_em_ctxt *ctxt, return ES_RETRY; } -static enum es_result vc_handle_mmio(struct ghcb *ghcb, - struct es_em_ctxt *ctxt) +static enum es_result vc_handle_mmio(struct ghcb *ghcb, struct es_em_ctxt *ctxt) { struct insn *insn = &ctxt->insn; unsigned int bytes = 0; + enum mmio_type mmio; enum es_result ret; + u8 sign_byte; long *reg_data; - switch (insn->opcode.bytes[0]) { - /* MMIO Write */ - case 0x88: - bytes = 1; - fallthrough; - case 0x89: - if (!bytes) - bytes = insn->opnd_bytes; + mmio = insn_decode_mmio(insn, &bytes); + if (mmio == MMIO_DECODE_FAILED) + return ES_DECODE_FAILED; - reg_data = vc_insn_get_reg(ctxt); + if (mmio != MMIO_WRITE_IMM && mmio != MMIO_MOVS) { + reg_data = insn_get_modrm_reg_ptr(insn, ctxt->regs); if (!reg_data) return ES_DECODE_FAILED; + } + switch (mmio) { + case MMIO_WRITE: memcpy(ghcb->shared_buffer, reg_data, bytes); - ret = vc_do_mmio(ghcb, ctxt, bytes, false); break; - - case 0xc6: - bytes = 1; - fallthrough; - case 0xc7: - if (!bytes) - bytes = insn->opnd_bytes; - + case MMIO_WRITE_IMM: memcpy(ghcb->shared_buffer, insn->immediate1.bytes, bytes); - ret = vc_do_mmio(ghcb, ctxt, bytes, false); break; - - /* MMIO Read */ - case 0x8a: - bytes = 1; - fallthrough; - case 0x8b: - if (!bytes) - bytes = insn->opnd_bytes; - + case MMIO_READ: ret = vc_do_mmio(ghcb, ctxt, bytes, true); if (ret) break; - reg_data = vc_insn_get_reg(ctxt); - if (!reg_data) - return ES_DECODE_FAILED; - /* Zero-extend for 32-bit operation */ if (bytes == 4) *reg_data = 0; memcpy(reg_data, ghcb->shared_buffer, bytes); break; + case MMIO_READ_ZERO_EXTEND: + ret = vc_do_mmio(ghcb, ctxt, bytes, true); + if (ret) + break; + + memset(reg_data, 0, insn->opnd_bytes); + memcpy(reg_data, ghcb->shared_buffer, bytes); + break; + case MMIO_READ_SIGN_EXTEND: + ret = vc_do_mmio(ghcb, ctxt, bytes, true); + if (ret) + break; - /* MOVS instruction */ - case 0xa4: - bytes = 1; - fallthrough; - case 0xa5: - if (!bytes) - bytes = insn->opnd_bytes; + if (bytes == 1) { + u8 *val = (u8 *)ghcb->shared_buffer; - ret = vc_handle_mmio_movs(ctxt, bytes); + sign_byte = (*val & 0x80) ? 0xff : 0x00; + } else { + u16 *val = (u16 *)ghcb->shared_buffer; + + sign_byte = (*val & 0x8000) ? 0xff : 0x00; + } + + /* Sign extend based on operand size */ + memset(reg_data, sign_byte, insn->opnd_bytes); + memcpy(reg_data, ghcb->shared_buffer, bytes); break; - /* Two-Byte Opcodes */ - case 0x0f: - ret = vc_handle_mmio_twobyte_ops(ghcb, ctxt); + case MMIO_MOVS: + ret = vc_handle_mmio_movs(ctxt, bytes); break; default: ret = ES_UNSUPPORTED; + break; } return ret; -- 2.25.1