From nobody Mon Feb 9 04:29:56 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=intel.com ARC-Seal: i=1; a=rsa-sha256; t=1602565957; cv=none; d=zohomail.com; s=zohoarc; b=aP7jBj5XYulTNhF+YZkAm4SuPsbkrBTkWNxEf1fJce7UoY9qOZ0pkSW27g6zcSFExKI9nWrmktjy+jrwEO19xv3btf6eAkd6zmvEfjOAzaXaGHUeIckXeIkX4R3vbw91LhNySRGUSXlO+XCFnvoNx1dPW20AhpiRNVid1/zC7Qg= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1602565957; h=Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:Message-ID:References:Sender:Subject:To; bh=rXzaM6FRgQPRSNYlPlNLPRzlbCXl9WtM0BYhCj1E/xY=; b=OGPKB9XL701i08ELfxmchMTh4pH3tFUCxdzgKQLfX5OzTZFqji+f3hQh+RzOQZOhJTkPScA6qwI38ql6xqYDP5NAHpgxW/HnBR83TJ3q4KxSSCH7xskxfeMMlF9aa9DSyhbTpli3ZkVaesnU8vd3iWrlIT6uRCzZMWb3edXwL9U= ARC-Authentication-Results: i=1; mx.zohomail.com; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail header.from= (p=none dis=none) header.from= Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1602565957866377.681913455895; Mon, 12 Oct 2020 22:12:37 -0700 (PDT) Received: from localhost ([::1]:41734 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kSCc0-0003eE-Bd for importer@patchew.org; Tue, 13 Oct 2020 01:12:36 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:44542) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kSCa5-0001tz-Df for qemu-devel@nongnu.org; Tue, 13 Oct 2020 01:10:38 -0400 Received: from mga11.intel.com ([192.55.52.93]:57342) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kSCa3-0006YN-EA for qemu-devel@nongnu.org; Tue, 13 Oct 2020 01:10:37 -0400 Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by fmsmga102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 12 Oct 2020 22:10:33 -0700 Received: from unknown (HELO local-michael-cet-test.sh.intel.com) ([10.239.159.128]) by fmsmga001.fm.intel.com with ESMTP; 12 Oct 2020 22:10:32 -0700 IronPort-SDR: ZpIJC5BkhLxARg0SCFv4QgSzPxDAdA0Lwy4UJPAhgcnQ8GzqLmLt24m6PdhArXcOdt2TQmln+J IKVxEcAGEwhw== X-IronPort-AV: E=McAfee;i="6000,8403,9772"; a="162385623" X-IronPort-AV: E=Sophos;i="5.77,369,1596524400"; d="scan'208";a="162385623" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False IronPort-SDR: fauG661PqbAzMbbiuKPR+SkL8WZM2qR0dPZKmFr5qqBQATUSduK9d2O8gMbU9XkIK4t+HgNqsV FBg8XlOjO27g== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.77,369,1596524400"; d="scan'208";a="420427128" From: Yang Weijiang To: pbonzini@redhat.com, mtosatti@redhat.com, rth@twiddle.net, ehabkost@redhat.com, sean.j.christopherson@intel.com, qemu-devel@nongnu.org Subject: [Qemu-devel][PATCH v6 4/6] x86/cpu: Add user-space MSR access interface for CET Date: Tue, 13 Oct 2020 13:19:33 +0800 Message-Id: <20201013051935.6052-5-weijiang.yang@intel.com> X-Mailer: git-send-email 2.17.2 In-Reply-To: <20201013051935.6052-1-weijiang.yang@intel.com> References: <20201013051935.6052-1-weijiang.yang@intel.com> Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=192.55.52.93; envelope-from=weijiang.yang@intel.com; helo=mga11.intel.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/10/13 01:10:25 X-ACL-Warn: Detected OS = FreeBSD 9.x or newer [fuzzy] X-Spam_score_int: -68 X-Spam_score: -6.9 X-Spam_bar: ------ X-Spam_report: (-6.9 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_HI=-5, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Yang Weijiang , hao.wu@intel.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" CET states are divided into user-mode and supervisor-mode states, MSR_KVM_GUEST_SSP stores current SHSTK pointer in use, MSR_IA32_U_CET and MSR_IA32_PL3_SSP are for user-mode states, others are for supervisor-mode states. Expose the access according to current CET supported bits in CPUID and XSS. Signed-off-by: Yang Weijiang --- target/i386/cpu.h | 18 ++++++++++++ target/i386/kvm.c | 73 +++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 91 insertions(+) diff --git a/target/i386/cpu.h b/target/i386/cpu.h index d4563fa0e8..9c0568672e 100644 --- a/target/i386/cpu.h +++ b/target/i386/cpu.h @@ -484,6 +484,15 @@ typedef enum X86Seg { #define MSR_IA32_VMX_TRUE_ENTRY_CTLS 0x00000490 #define MSR_IA32_VMX_VMFUNC 0x00000491 =20 +#define MSR_IA32_U_CET 0x6a0 +#define MSR_IA32_S_CET 0x6a2 +#define MSR_IA32_PL0_SSP 0x6a4 +#define MSR_IA32_PL1_SSP 0x6a5 +#define MSR_IA32_PL2_SSP 0x6a6 +#define MSR_IA32_PL3_SSP 0x6a7 +#define MSR_IA32_SSP_TBL 0x6a8 +#define MSR_KVM_GUEST_SSP 0x4b564d06 + #define XSTATE_FP_BIT 0 #define XSTATE_SSE_BIT 1 #define XSTATE_YMM_BIT 2 @@ -1583,6 +1592,15 @@ typedef struct CPUX86State { =20 uintptr_t retaddr; =20 + uint64_t u_cet; + uint64_t s_cet; + uint64_t pl0_ssp; + uint64_t pl1_ssp; + uint64_t pl2_ssp; + uint64_t pl3_ssp; + uint64_t ssp_tbl; + uint64_t guest_ssp; + /* Fields up to this point are cleared by a CPU reset */ struct {} end_reset_fields; =20 diff --git a/target/i386/kvm.c b/target/i386/kvm.c index 6f18d940a5..3315d5dd4f 100644 --- a/target/i386/kvm.c +++ b/target/i386/kvm.c @@ -3001,6 +3001,31 @@ static int kvm_put_msrs(X86CPU *cpu, int level) } } =20 + if (((env->features[FEAT_7_0_ECX] & CPUID_7_0_ECX_CET_SHSTK) || + (env->features[FEAT_7_0_EDX] & CPUID_7_0_EDX_CET_IBT)) && + (env->features[FEAT_XSAVE_XSS_LO] & XSTATE_CET_U_MASK)) { + kvm_msr_entry_add(cpu, MSR_IA32_U_CET, env->u_cet); + kvm_msr_entry_add(cpu, MSR_IA32_PL3_SSP, env->pl3_ssp); + } + + if (env->features[FEAT_XSAVE_XSS_LO] & XSTATE_CET_S_MASK) { + if (env->features[FEAT_7_0_ECX] & CPUID_7_0_ECX_CET_SHSTK) { + kvm_msr_entry_add(cpu, MSR_IA32_PL0_SSP, env->pl0_ssp); + kvm_msr_entry_add(cpu, MSR_IA32_PL1_SSP, env->pl1_ssp); + kvm_msr_entry_add(cpu, MSR_IA32_PL2_SSP, env->pl2_ssp); + kvm_msr_entry_add(cpu, MSR_IA32_SSP_TBL, env->ssp_tbl); + } + + if (env->features[FEAT_7_0_EDX] & CPUID_7_0_EDX_CET_IBT) { + kvm_msr_entry_add(cpu, MSR_IA32_S_CET, env->s_cet); + } + } + + if ((env->features[FEAT_7_0_ECX] & CPUID_7_0_ECX_CET_SHSTK) && + (env->features[FEAT_XSAVE_XSS_LO] & (XSTATE_CET_U_MASK | + XSTATE_CET_S_MASK))) + kvm_msr_entry_add(cpu, MSR_KVM_GUEST_SSP, env->guest_ssp); + return kvm_buf_set_msrs(cpu); } =20 @@ -3317,6 +3342,30 @@ static int kvm_get_msrs(X86CPU *cpu) } } =20 + if (((env->features[FEAT_7_0_ECX] & CPUID_7_0_ECX_CET_SHSTK) || + (env->features[FEAT_7_0_EDX] & CPUID_7_0_EDX_CET_IBT)) && + (env->features[FEAT_XSAVE_XSS_LO] & XSTATE_CET_U_MASK)) { + kvm_msr_entry_add(cpu, MSR_IA32_U_CET, 0); + kvm_msr_entry_add(cpu, MSR_IA32_PL3_SSP, 0); + } + + if (env->features[FEAT_XSAVE_XSS_LO] & XSTATE_CET_S_MASK) { + if (env->features[FEAT_7_0_ECX] & CPUID_7_0_ECX_CET_SHSTK) { + kvm_msr_entry_add(cpu, MSR_IA32_PL0_SSP, 0); + kvm_msr_entry_add(cpu, MSR_IA32_PL1_SSP, 0); + kvm_msr_entry_add(cpu, MSR_IA32_PL2_SSP, 0); + kvm_msr_entry_add(cpu, MSR_IA32_SSP_TBL, 0); + } + + if (env->features[FEAT_7_0_EDX] & CPUID_7_0_EDX_CET_IBT) { + kvm_msr_entry_add(cpu, MSR_IA32_S_CET, 0); + } + } + if ((env->features[FEAT_7_0_ECX] & CPUID_7_0_ECX_CET_SHSTK) && + (env->features[FEAT_XSAVE_XSS_LO] & (XSTATE_CET_U_MASK | + XSTATE_CET_S_MASK))) + kvm_msr_entry_add(cpu, MSR_KVM_GUEST_SSP, 0); + ret =3D kvm_vcpu_ioctl(CPU(cpu), KVM_GET_MSRS, cpu->kvm_msr_buf); if (ret < 0) { return ret; @@ -3600,6 +3649,30 @@ static int kvm_get_msrs(X86CPU *cpu) case MSR_IA32_RTIT_ADDR0_A ... MSR_IA32_RTIT_ADDR3_B: env->msr_rtit_addrs[index - MSR_IA32_RTIT_ADDR0_A] =3D msrs[i]= .data; break; + case MSR_IA32_U_CET: + env->u_cet =3D msrs[i].data; + break; + case MSR_IA32_S_CET: + env->s_cet =3D msrs[i].data; + break; + case MSR_IA32_PL0_SSP: + env->pl0_ssp =3D msrs[i].data; + break; + case MSR_IA32_PL1_SSP: + env->pl1_ssp =3D msrs[i].data; + break; + case MSR_IA32_PL2_SSP: + env->pl2_ssp =3D msrs[i].data; + break; + case MSR_IA32_PL3_SSP: + env->pl3_ssp =3D msrs[i].data; + break; + case MSR_IA32_SSP_TBL: + env->ssp_tbl =3D msrs[i].data; + break; + case MSR_KVM_GUEST_SSP: + env->guest_ssp =3D msrs[i].data; + break; } } =20 --=20 2.26.2