From patchwork Mon Jun 25 03:39:17 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Robert Hoo X-Patchwork-Id: 10485053 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 438D6601D5 for ; Mon, 25 Jun 2018 05:15:31 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 34DCF28783 for ; Mon, 25 Jun 2018 05:15:31 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 2825828857; Mon, 25 Jun 2018 05:15:31 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00, MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 99E9628783 for ; Mon, 25 Jun 2018 05:15:30 +0000 (UTC) Received: from localhost ([::1]:44275 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fXJqb-0007P7-Iq for patchwork-qemu-devel@patchwork.kernel.org; Mon, 25 Jun 2018 01:15:29 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:36624) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fXIMJ-0001mF-Dp for qemu-devel@nongnu.org; Sun, 24 Jun 2018 23:40:09 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fXIME-0007sQ-Ik for qemu-devel@nongnu.org; Sun, 24 Jun 2018 23:40:07 -0400 Received: from mga17.intel.com ([192.55.52.151]:25151) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1fXIME-0007qo-9x for qemu-devel@nongnu.org; Sun, 24 Jun 2018 23:40:02 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga005.jf.intel.com ([10.7.209.41]) by fmsmga107.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 24 Jun 2018 20:39:53 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.51,268,1526367600"; d="scan'208";a="235277831" Received: from sqa-gate.sh.intel.com (HELO robert-ivt.tsp.org) ([10.239.48.212]) by orsmga005.jf.intel.com with ESMTP; 24 Jun 2018 20:39:47 -0700 From: Robert Hoo To: qemu-devel@nongnu.org, pbonzini@redhat.com, rth@twiddle.net, ehabkost@redhat.com Date: Mon, 25 Jun 2018 11:39:17 +0800 Message-Id: <1529897961-134132-2-git-send-email-robert.hu@linux.intel.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1529897961-134132-1-git-send-email-robert.hu@linux.intel.com> References: <1529897961-134132-1-git-send-email-robert.hu@linux.intel.com> X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 192.55.52.151 X-Mailman-Approved-At: Mon, 25 Jun 2018 01:13:50 -0400 Subject: [Qemu-devel] [PATCH 1/5] i386: Add support for IA32_PRED_CMD and IA32_ARCH_CAPABILITIES MSRs X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: robert.hu@intel.com, Robert Hoo Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP IA32_PRED_CMD MSR gives software a way to issue commands that affect the state of indirect branch predictors. Enumerated by CPUID.(EAX=7H,ECX=0):EDX[26]. IA32_ARCH_CAPABILITIES MSR enumerates architectural features of RDCL_NO and IBRS_ALL. Enumerated by CPUID.(EAX=07H, ECX=0):EDX[29]. https://software.intel.com/sites/default/files/managed/c5/63/336996-Speculative-Execution-Side-Channel-Mitigations.pdf Signed-off-by: Robert Hoo --- target/i386/cpu.h | 4 ++++ target/i386/kvm.c | 27 ++++++++++++++++++++++++++- target/i386/machine.c | 40 ++++++++++++++++++++++++++++++++++++++++ 3 files changed, 70 insertions(+), 1 deletion(-) diff --git a/target/i386/cpu.h b/target/i386/cpu.h index 89c82be..734a73e 100644 --- a/target/i386/cpu.h +++ b/target/i386/cpu.h @@ -352,6 +352,8 @@ typedef enum X86Seg { #define MSR_TSC_ADJUST 0x0000003b #define MSR_IA32_SPEC_CTRL 0x48 #define MSR_VIRT_SSBD 0xc001011f +#define MSR_IA32_PRED_CMD 0x49 +#define MSR_IA32_ARCH_CAPABILITIES 0x10a #define MSR_IA32_TSCDEADLINE 0x6e0 #define FEATURE_CONTROL_LOCKED (1<<0) @@ -1210,6 +1212,8 @@ typedef struct CPUX86State { uint64_t spec_ctrl; uint64_t virt_ssbd; + uint64_t pred_cmd; + uint64_t arch_capabilities; /* End of state preserved by INIT (dummy marker). */ struct {} end_init_save; diff --git a/target/i386/kvm.c b/target/i386/kvm.c index 445e0e0..5232446 100644 --- a/target/i386/kvm.c +++ b/target/i386/kvm.c @@ -93,6 +93,8 @@ static bool has_msr_hv_reenlightenment; static bool has_msr_xss; static bool has_msr_spec_ctrl; static bool has_msr_virt_ssbd; +static bool has_msr_pred_cmd; +static bool has_msr_arch_capabilities; static bool has_msr_smi_count; static uint32_t has_architectural_pmu_version; @@ -1258,6 +1260,11 @@ static int kvm_get_supported_msrs(KVMState *s) break; case MSR_VIRT_SSBD: has_msr_virt_ssbd = true; + case MSR_IA32_PRED_CMD: + has_msr_pred_cmd = true; + break; + case MSR_IA32_ARCH_CAPABILITIES: + has_msr_arch_capabilities = true; break; } } @@ -1750,7 +1757,13 @@ static int kvm_put_msrs(X86CPU *cpu, int level) if (has_msr_virt_ssbd) { kvm_msr_entry_add(cpu, MSR_VIRT_SSBD, env->virt_ssbd); } - + if (has_msr_pred_cmd) { + kvm_msr_entry_add(cpu, MSR_IA32_PRED_CMD, env->pred_cmd); + } + if (has_msr_arch_capabilities) { + kvm_msr_entry_add(cpu, MSR_IA32_ARCH_CAPABILITIES, + env->arch_capabilities); + } #ifdef TARGET_X86_64 if (lm_capable_kernel) { kvm_msr_entry_add(cpu, MSR_CSTAR, env->cstar); @@ -2133,6 +2146,13 @@ static int kvm_get_msrs(X86CPU *cpu) if (has_msr_virt_ssbd) { kvm_msr_entry_add(cpu, MSR_VIRT_SSBD, 0); } + if (has_msr_pred_cmd) { + kvm_msr_entry_add(cpu, MSR_IA32_PRED_CMD, 0); + } + if (has_msr_arch_capabilities) { + kvm_msr_entry_add(cpu, MSR_IA32_ARCH_CAPABILITIES, 0); + } + if (!env->tsc_valid) { kvm_msr_entry_add(cpu, MSR_IA32_TSC, 0); env->tsc_valid = !runstate_is_running(); @@ -2514,6 +2534,11 @@ static int kvm_get_msrs(X86CPU *cpu) break; case MSR_VIRT_SSBD: env->virt_ssbd = msrs[i].data; + case MSR_IA32_PRED_CMD: + env->pred_cmd = msrs[i].data; + break; + case MSR_IA32_ARCH_CAPABILITIES: + env->arch_capabilities = msrs[i].data; break; case MSR_IA32_RTIT_CTL: env->msr_rtit_ctrl = msrs[i].data; diff --git a/target/i386/machine.c b/target/i386/machine.c index 4d98d36..089aba0 100644 --- a/target/i386/machine.c +++ b/target/i386/machine.c @@ -879,6 +879,44 @@ static const VMStateDescription vmstate_spec_ctrl = { } }; +static bool pred_cmd_needed(void *opaque) +{ + X86CPU *cpu = opaque; + CPUX86State *env = &cpu->env; + + return env->pred_cmd != 0; +} + +static const VMStateDescription vmstate_pred_cmd = { + .name = "cpu/pred_cmd", + .version_id = 1, + .minimum_version_id = 1, + .needed = pred_cmd_needed, + .fields = (VMStateField[]){ + VMSTATE_UINT64(env.arch_capabilities, X86CPU), + VMSTATE_END_OF_LIST() + } +}; + +static bool arch_capabilities_needed(void *opaque) +{ + X86CPU *cpu = opaque; + CPUX86State *env = &cpu->env; + + return env->arch_capabilities != 0; +} + +static const VMStateDescription vmstate_arch_capabilities = { + .name = "cpu/arch_capabilities", + .version_id = 1, + .minimum_version_id = 1, + .needed = arch_capabilities_needed, + .fields = (VMStateField[]){ + VMSTATE_UINT64(env.arch_capabilities, X86CPU), + VMSTATE_END_OF_LIST() + } +}; + static bool intel_pt_enable_needed(void *opaque) { X86CPU *cpu = opaque; @@ -1056,6 +1094,8 @@ VMStateDescription vmstate_x86_cpu = { &vmstate_pkru, #endif &vmstate_spec_ctrl, + &vmstate_pred_cmd, + &vmstate_arch_capabilities, &vmstate_mcg_ext_ctl, &vmstate_msr_intel_pt, &vmstate_msr_virt_ssbd,