From nobody Sat Feb 7 07:31:20 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; envelope-from=xen-devel-bounces@lists.xenproject.org; helo=lists.xenproject.org; Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org; dmarc=pass(p=quarantine dis=none) header.from=suse.com ARC-Seal: i=1; a=rsa-sha256; t=1619103485; cv=none; d=zohomail.com; s=zohoarc; b=XlX65/Co4K2MbtyRzqB/0fEyCbg3O6JFD1ZzB6/AstH9wh31AT8pcRE+L5T2Jjeew5L219b+jk5dqaVnQep0/yvRIKAZXWWtJ2pCHSERAC0mZaJyhmFg5lXZlHZensE4wdNw68v/fRCvjeqgXJJ8Z+KCFGQ9fA15YczXdMMp9q0= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1619103485; h=Content-Type:Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To; bh=0Kar8c0Mm+YFIHWmPbC+8g9omJWrv1zJZFI3hL51bIQ=; b=n3A2GWJiZtziRepyIGH2yWO3HzdK/RLPpcnmdU363Hj5sheVd5JzHT1mzcOoJjl/lzJ66CN8ZBKoabQhwMlyppqn3Bbt1ReDfVMHIzcxBRhHxxRrlJrFPHy0DFDwZsK8vjhTbbU4u9C774xZoxaaAaqCrZlVL6XJ419HP9OYhXA= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org; dmarc=pass header.from= (p=quarantine dis=none) header.from= Return-Path: Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) by mx.zohomail.com with SMTPS id 1619103485105161.15449834247204; Thu, 22 Apr 2021 07:58:05 -0700 (PDT) Received: from list by lists.xenproject.org with outflank-mailman.115580.220563 (Exim 4.92) (envelope-from ) id 1lZam4-0006m8-7m; Thu, 22 Apr 2021 14:57:48 +0000 Received: by outflank-mailman (output) from mailman id 115580.220563; Thu, 22 Apr 2021 14:57:48 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1lZam4-0006m0-4S; Thu, 22 Apr 2021 14:57:48 +0000 Received: by outflank-mailman (input) for mailman id 115580; Thu, 22 Apr 2021 14:57:46 +0000 Received: from all-amaz-eas1.inumbo.com ([34.197.232.57] helo=us1-amaz-eas2.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1lZam2-0006lp-BK for xen-devel@lists.xenproject.org; Thu, 22 Apr 2021 14:57:46 +0000 Received: from mx2.suse.de (unknown [195.135.220.15]) by us1-amaz-eas2.inumbo.com (Halon) with ESMTPS id 751cc7ac-e603-4a1f-a002-1c66535d470c; Thu, 22 Apr 2021 14:57:45 +0000 (UTC) Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 4F834B16A; Thu, 22 Apr 2021 14:57:44 +0000 (UTC) X-Outflank-Mailman: Message body and most headers restored to incoming version X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 751cc7ac-e603-4a1f-a002-1c66535d470c X-Virus-Scanned: by amavisd-new at test-mx.suse.de DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1619103464; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=0Kar8c0Mm+YFIHWmPbC+8g9omJWrv1zJZFI3hL51bIQ=; b=eBoUDSl4ml+KE6JjGdKtVsKE+2Wx9sR4QP1+q10TA8kbXIfKcC+zm84gssNoZHJdr0UWB7 sitgryWGEKbPDgd8TyrxPV2p9gvlA5b/Q48G/JA25MSVpy6bdgCyvyj0tdfcnLXqLXTa+Q Tdxo0rzbhLGtMx+1soYolNUJIghEpzY= Subject: [PATCH v3 22/22] x86: permit guests to use AMX and XFD From: Jan Beulich To: "xen-devel@lists.xenproject.org" Cc: Andrew Cooper , George Dunlap , Wei Liu , =?UTF-8?Q?Roger_Pau_Monn=c3=a9?= References: <322de6db-e01f-0b57-5777-5d94a13c441a@suse.com> Message-ID: Date: Thu, 22 Apr 2021 16:57:44 +0200 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.10.0 MIME-Version: 1.0 In-Reply-To: <322de6db-e01f-0b57-5777-5d94a13c441a@suse.com> Content-Language: en-US Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @suse.com) Content-Type: text/plain; charset="utf-8" These features are marked experimental (for only parts of the code actually having got tested yet, while other parts require respective hardware) and opt-in for guests. Signed-off-by: Jan Beulich --- v3: New. --- a/CHANGELOG.md +++ b/CHANGELOG.md @@ -6,6 +6,9 @@ The format is based on [Keep a Changelog =20 ## [unstable UNRELEASED](https://xenbits.xen.org/gitweb/?p=3Dxen.git;a=3Ds= hortlog;h=3Dstaging) - TBD =20 +### Added / support upgraded + - x86 AMX and XFD (Experimental) + ## [4.15.0 UNRELEASED](https://xenbits.xen.org/gitweb/?p=3Dxen.git;a=3Dsho= rtlog;h=3DRELEASE-4.15.0) - TBD =20 ### Added / support upgraded --- a/SUPPORT.md +++ b/SUPPORT.md @@ -61,6 +61,10 @@ For the Cortex A57 r0p0 - r1p1, see Erra =20 Status: Tech Preview =20 +### x86 AMX and XFD + + Status: Experimental + ### IOMMU =20 Status, AMD IOMMU: Supported --- a/xen/include/public/arch-x86/cpufeatureset.h +++ b/xen/include/public/arch-x86/cpufeatureset.h @@ -191,7 +191,7 @@ XEN_CPUFEATURE(XSAVEOPT, 4*32+ 0) / XEN_CPUFEATURE(XSAVEC, 4*32+ 1) /*A XSAVEC/XRSTORC instructions */ XEN_CPUFEATURE(XGETBV1, 4*32+ 2) /*A XGETBV with %ecx=3D1 */ XEN_CPUFEATURE(XSAVES, 4*32+ 3) /*S XSAVES/XRSTORS instructions */ -XEN_CPUFEATURE(XFD, 4*32+ 4) /* XFD / XFD_ERR MSRs */ +XEN_CPUFEATURE(XFD, 4*32+ 4) /*a XFD / XFD_ERR MSRs */ =20 /* Intel-defined CPU features, CPUID level 0x00000007:0.ebx, word 5 */ XEN_CPUFEATURE(FSGSBASE, 5*32+ 0) /*A {RD,WR}{FS,GS}BASE instruction= s */ @@ -269,9 +269,9 @@ XEN_CPUFEATURE(MD_CLEAR, 9*32+10) / XEN_CPUFEATURE(TSX_FORCE_ABORT, 9*32+13) /* MSR_TSX_FORCE_ABORT.RTM_ABORT = */ XEN_CPUFEATURE(SERIALIZE, 9*32+14) /*a SERIALIZE insn */ XEN_CPUFEATURE(CET_IBT, 9*32+20) /* CET - Indirect Branch Tracking= */ -XEN_CPUFEATURE(AMX_BF16, 9*32+22) /* AMX BFloat16 instructions */ -XEN_CPUFEATURE(AMX_TILE, 9*32+24) /* AMX tile architecture */ -XEN_CPUFEATURE(AMX_INT8, 9*32+25) /* AMX 8-bit integer instructions= */ +XEN_CPUFEATURE(AMX_BF16, 9*32+22) /*a AMX BFloat16 instructions */ +XEN_CPUFEATURE(AMX_TILE, 9*32+24) /*a AMX tile architecture */ +XEN_CPUFEATURE(AMX_INT8, 9*32+25) /*a AMX 8-bit integer instructions= */ XEN_CPUFEATURE(IBRSB, 9*32+26) /*A IBRS and IBPB support (used by= Intel) */ XEN_CPUFEATURE(STIBP, 9*32+27) /*A STIBP */ XEN_CPUFEATURE(L1D_FLUSH, 9*32+28) /*S MSR_FLUSH_CMD and L1D flush. */