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[2620:137:e000::3:2]) by mx.google.com with ESMTPS id s13-20020a056a00194d00b006c34752a6e8si94850pfk.81.2023.11.02.09.35.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 02 Nov 2023 09:35:13 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:2 as permitted sender) client-ip=2620:137:e000::3:2; Authentication-Results: mx.google.com; dkim=pass header.i=@intel.com header.s=Intel header.b="gbewLks/"; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:2 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=intel.com Received: from out1.vger.email (depot.vger.email [IPv6:2620:137:e000::3:0]) by agentk.vger.email (Postfix) with ESMTP id 906B78133CA5; Thu, 2 Nov 2023 09:35:07 -0700 (PDT) X-Virus-Status: Clean X-Virus-Scanned: clamav-milter 0.103.10 at agentk.vger.email Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1377021AbjKBQeJ (ORCPT + 35 others); Thu, 2 Nov 2023 12:34:09 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42022 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1347663AbjKBQeF (ORCPT ); Thu, 2 Nov 2023 12:34:05 -0400 Received: from mgamail.intel.com (mgamail.intel.com [192.55.52.115]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5CE08185; Thu, 2 Nov 2023 09:34:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1698942840; x=1730478840; h=from:to:cc:subject:date:message-id:in-reply-to: references; bh=Nbhi+Lxa9AGjvct6KXRPu7ZYORV4sX+cH5+O4Ji6OnI=; b=gbewLks/8QT5Uf9CVVVDqRPSe7I34IZH4YpKdYn8dyn/oguXuNdq2JF+ MvG5DIZxNffE44fgACwdg+2RFLLpdzpJRbmq9bqJiT6MsKAg/6c/J8agv Y4JIKi1gE5N9LJJcRAbpGwwrQimn2SYbyomRCx5sn1bzJvwJ7dD8leuyQ +CXIGIEVnK/iK8bogWzlwSzDrwmeFi7iXzRFfsQJ9FraO0NbqtV2abJ84 nQnTGfCayONpdq+NWleCidIS6/EGbAEShGLun6e0a94/sjp1HULoxWLK+ xmTWs6aA6OcPsJvgQQac5OYp8OPQq9HS1M44dJuDamafg8oXxou9U1Vu4 w==; X-IronPort-AV: E=McAfee;i="6600,9927,10882"; a="388571121" X-IronPort-AV: E=Sophos;i="6.03,272,1694761200"; d="scan'208";a="388571121" Received: from fmviesa001.fm.intel.com ([10.60.135.141]) by fmsmga103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 02 Nov 2023 09:33:51 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.03,272,1694761200"; d="scan'208";a="9448555" Received: from arthur-vostro-3668.sh.intel.com ([10.239.159.65]) by smtpauth.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 02 Nov 2023 09:33:42 -0700 From: Zeng Guang To: Sean Christopherson , Paolo Bonzini , Shuah Khan , Marc Zyngier , Oliver Upton , James Morse , Suzuki K Poulose , Zenghui Yu , Anup Patel , Atish Patra , David Hildenbrand Cc: kvm@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, Zeng Guang Subject: [RFC PATCH v1 8/8] KVM: selftests: x86: Add KVM forced emulation prefix capability Date: Thu, 2 Nov 2023 23:51:11 +0800 Message-Id: <20231102155111.28821-9-guang.zeng@intel.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20231102155111.28821-1-guang.zeng@intel.com> References: <20231102155111.28821-1-guang.zeng@intel.com> X-Spam-Status: No, score=-1.3 required=5.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE, URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on agentk.vger.email Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (agentk.vger.email [0.0.0.0]); Thu, 02 Nov 2023 09:35:07 -0700 (PDT) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1781470764318308669 X-GMAIL-MSGID: 1781470764318308669 Introduce KVM selftest exception fixup using forced emulation prefix to emulate instruction unconditionally when kvm.force_emulation_prefix is enabled. Signed-off-by: Zeng Guang --- .../selftests/kvm/include/x86_64/processor.h | 20 +++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/tools/testing/selftests/kvm/include/x86_64/processor.h b/tools/testing/selftests/kvm/include/x86_64/processor.h index 2534bdf8aa71..a1645508affc 100644 --- a/tools/testing/selftests/kvm/include/x86_64/processor.h +++ b/tools/testing/selftests/kvm/include/x86_64/processor.h @@ -1110,6 +1110,10 @@ void vcpu_init_descriptor_tables(struct kvm_vcpu *vcpu); void vm_install_exception_handler(struct kvm_vm *vm, int vector, void (*handler)(struct ex_regs *)); +/* Forced emulation prefix for KVM emulating instruction unconditionally */ +#define KVM_FEP "ud2; .byte 'k', 'v', 'm';" +#define KVM_FEP_LENGTH 5 + /* If a toddler were to say "abracadabra". */ #define KVM_EXCEPTION_MAGIC 0xabacadabaULL @@ -1149,6 +1153,22 @@ void vm_install_exception_handler(struct kvm_vm *vm, int vector, "mov %%r9b, %[vector]\n\t" \ "mov %%r10, %[error_code]\n\t" +/* + * KVM selftest exception fixup using forced emulation prefix enforces KVM + * on emulating instruction unconditionally when kvm.force_emulation_prefix + * is enabled. + */ +#define KVM_FEP_ASM_SAFE(insn) \ + "mov $" __stringify(KVM_EXCEPTION_MAGIC) ", %%r9\n\t" \ + "lea 1f(%%rip), %%r10\n\t" \ + "lea 2f(%%rip), %%r11\n\t" \ + KVM_FEP \ + "1: " insn "\n\t" \ + "xor %%r9, %%r9\n\t" \ + "2:\n\t" \ + "mov %%r9b, %[vector]\n\t" \ + "mov %%r10, %[error_code]\n\t" + #define KVM_ASM_SAFE_OUTPUTS(v, ec) [vector] "=qm"(v), [error_code] "=rm"(ec) #define KVM_ASM_SAFE_CLOBBERS "r9", "r10", "r11"