From patchwork Wed Dec 29 13:13:23 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yang Zhong X-Patchwork-Id: 12700919 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6680DC4332F for ; Wed, 29 Dec 2021 13:15:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240201AbhL2NPD (ORCPT ); Wed, 29 Dec 2021 08:15:03 -0500 Received: from mga07.intel.com ([134.134.136.100]:28049 "EHLO mga07.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240433AbhL2NOY (ORCPT ); Wed, 29 Dec 2021 08:14:24 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1640783664; x=1672319664; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=0UD6nWK4GZnEjA/aZDd4WoR0dLayFxRmGDiVQqvy/Kc=; b=geJcottNTgLoZ9YJccnH0vEpfxBulwRTrXE0+ESPfhraNheTg4zxrwlX pL5SXt9dYsF7mbr1CFaXtj8dPhtG/swEl+HDlGfFB865M34mEIzgM/aEB DbsockZt9D3cKx11Li7V8zHCqQJ1NIVvOKzl8XBidN1Kub/q/XAOOyt+X 9FlEBrtj3KaFNHA2BpYq+vMbTdKwdYa6lgYAAOugCV653hVbNg4LJbI+I ufLojZVyfh3Br76LK2mV5u1ThLbdiVVqvkXkSAoIoC+BVmI6ipZafevnw K/jH2v3kMMQQ1LFkGoDkKFCIv6AqoJWyMPTJkx7bm3pxOL3RwqGud8kfI w==; X-IronPort-AV: E=McAfee;i="6200,9189,10211"; a="304876154" X-IronPort-AV: E=Sophos;i="5.88,245,1635231600"; d="scan'208";a="304876154" Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by orsmga105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 29 Dec 2021 05:13:42 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.88,245,1635231600"; d="scan'208";a="666281207" Received: from 984fee00bf64.jf.intel.com ([10.165.54.77]) by fmsmga001.fm.intel.com with ESMTP; 29 Dec 2021 05:13:41 -0800 From: Yang Zhong To: x86@kernel.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, pbonzini@redhat.com, corbet@lwn.net, shuah@kernel.org Cc: seanjc@google.com, jun.nakajima@intel.com, kevin.tian@intel.com, jing2.liu@linux.intel.com, jing2.liu@intel.com, guang.zeng@intel.com, wei.w.wang@intel.com, yang.zhong@intel.com Subject: [PATCH v4 16/21] kvm: x86: Add CPUID support for Intel AMX Date: Wed, 29 Dec 2021 05:13:23 -0800 Message-Id: <20211229131328.12283-17-yang.zhong@intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20211229131328.12283-1-yang.zhong@intel.com> References: <20211229131328.12283-1-yang.zhong@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org From: Jing Liu Extend CPUID emulation to support XFD, AMX_TILE, AMX_INT8 and AMX_BF16. Adding those bits into kvm_cpu_caps finally activates all previous logics in this series. Signed-off-by: Jing Liu Signed-off-by: Yang Zhong --- arch/x86/include/asm/cpufeatures.h | 2 ++ arch/x86/kvm/cpuid.c | 25 +++++++++++++++++++++++-- 2 files changed, 25 insertions(+), 2 deletions(-) diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h index d5b5f2ab87a0..da872b6f8d8b 100644 --- a/arch/x86/include/asm/cpufeatures.h +++ b/arch/x86/include/asm/cpufeatures.h @@ -299,7 +299,9 @@ /* Intel-defined CPU features, CPUID level 0x00000007:1 (EAX), word 12 */ #define X86_FEATURE_AVX_VNNI (12*32+ 4) /* AVX VNNI instructions */ #define X86_FEATURE_AVX512_BF16 (12*32+ 5) /* AVX512 BFLOAT16 instructions */ +#define X86_FEATURE_AMX_BF16 (18*32+22) /* AMX bf16 Support */ #define X86_FEATURE_AMX_TILE (18*32+24) /* AMX tile Support */ +#define X86_FEATURE_AMX_INT8 (18*32+25) /* AMX int8 Support */ /* AMD-defined CPU features, CPUID level 0x80000008 (EBX), word 13 */ #define X86_FEATURE_CLZERO (13*32+ 0) /* CLZERO instruction */ diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c index acbc10db550e..bce514637703 100644 --- a/arch/x86/kvm/cpuid.c +++ b/arch/x86/kvm/cpuid.c @@ -525,7 +525,8 @@ void kvm_set_cpu_caps(void) F(AVX512_4VNNIW) | F(AVX512_4FMAPS) | F(SPEC_CTRL) | F(SPEC_CTRL_SSBD) | F(ARCH_CAPABILITIES) | F(INTEL_STIBP) | F(MD_CLEAR) | F(AVX512_VP2INTERSECT) | F(FSRM) | - F(SERIALIZE) | F(TSXLDTRK) | F(AVX512_FP16) + F(SERIALIZE) | F(TSXLDTRK) | F(AVX512_FP16) | + F(AMX_TILE) | F(AMX_INT8) | F(AMX_BF16) ); /* TSC_ADJUST and ARCH_CAPABILITIES are emulated in software. */ @@ -544,7 +545,7 @@ void kvm_set_cpu_caps(void) ); kvm_cpu_cap_mask(CPUID_D_1_EAX, - F(XSAVEOPT) | F(XSAVEC) | F(XGETBV1) | F(XSAVES) + F(XSAVEOPT) | F(XSAVEC) | F(XGETBV1) | F(XSAVES) | F(XFD) ); kvm_cpu_cap_init_scattered(CPUID_12_EAX, @@ -670,6 +671,8 @@ static struct kvm_cpuid_entry2 *do_host_cpuid(struct kvm_cpuid_array *array, case 0x14: case 0x17: case 0x18: + case 0x1d: + case 0x1e: case 0x1f: case 0x8000001d: entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX; @@ -942,6 +945,24 @@ static inline int __do_cpuid_func(struct kvm_cpuid_array *array, u32 function) goto out; } break; + /* Intel AMX TILE */ + case 0x1d: + if (!kvm_cpu_cap_has(X86_FEATURE_AMX_TILE)) { + entry->eax = entry->ebx = entry->ecx = entry->edx = 0; + break; + } + + for (i = 1, max_idx = entry->eax; i <= max_idx; ++i) { + if (!do_host_cpuid(array, function, i)) + goto out; + } + break; + case 0x1e: /* TMUL information */ + if (!kvm_cpu_cap_has(X86_FEATURE_AMX_TILE)) { + entry->eax = entry->ebx = entry->ecx = entry->edx = 0; + break; + } + break; case KVM_CPUID_SIGNATURE: { const u32 *sigptr = (const u32 *)KVM_SIGNATURE; entry->eax = KVM_CPUID_FEATURES;