From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=198.175.65.19 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793000425; b=B9+8pj7s/rfssdBZG8awK7Fsbath2oL1f2+rCgI265RGpxrXBq5OeC7bu5EsKro2iDQe 50pO6RfB8gynZfL0+QITvoRAptKH1DldcmLdePrLoq9HYvi/Pgy+CosW6+P+zJb3X+lUb iG29KbbMtKABu1VSporIBn88zL+HRc86VLJ5Lvf26NnH3sBYvCKPatHT4u72M1J8Xe15N Vvo0FMXVDwSuA+jue83DJmsRmNL+ZW3wSOTbMNP7No1XZIqf1FCamt25XfR5m2T+jVNdO mPpty1brmmZaTNqGMrrrDGme5P6iqzeR956OezmusQxQ2WoJMD/wgch9TTAanRQow3w== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793000425; h=DMARC-Filter:DKIM-Signature:X-CSE-ConnectionGUID:X-CSE-MsgGUID: X-IronPort-AV:X-IronPort-AV:Received:X-CSE-ConnectionGUID: X-CSE-MsgGUID:X-ExtLoop1:X-IronPort-AV:Received:Message-ID:Date: MIME-Version:User-Agent:Subject:To:Cc:References:Content-Language: From:In-Reply-To:Content-Type:Content-Transfer-Encoding; bh=8T10hJCk/kOeswwpJvKXMYFyC3jypKOiaTvB8IF5Fd0=; b=Ts0RDjAsNbgW1K1Wzxs2ibsVSgEzqBpEuyyPH0J+8IVQERT3c4lYx0S9ZHsQ8/4EWmvo K6vel86Jjz/xSJh44pVpTNbw6BN3INHa32GteeOg9uDFWZJKN32yxhcPeQeqs+BckLDAY We+6V5PsUz8JyPfc9ZbGwnVQSKmhjoR/u8OAmzcBwWIZR/wmJJqwfJIVnnQ81STaEfGgr 9q7twF56oYH44S8XF+NoX6oPGF2L7bg1rmWFGYt58jtpse7URXdoFDT4PPtnBaRJPiuQz ncHPXAqK8diBXA69H99osv1faeuCuc6XsN9w0pQ5qeU9b+ZBRw4sh4VmB38YkFJvdtw== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass header.d=intel.com header.i=@intel.com header.a=rsa-sha256 header.s=Intel header.b=nnbEAEi9; arc=none smtp.remote-ip=198.175.65.19 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.19]) (using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 55F7E606A31F for ; Mon, 26 Oct 2026 07:40:23 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org 55F7E606A31F Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=intel.com header.i=@intel.com header.a=rsa-sha256 header.s=Intel header.b=nnbEAEi9 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1793000423; x=1824536423; h=message-id:date:mime-version:subject:to:cc:references: from:in-reply-to:content-transfer-encoding; bh=FF+d8a+jtwAMDOrVTY9A6IFopNqIDLwibtD5Fx43VvI=; b=nnbEAEi9Inq56yugrWuqaObVZIhR6pGyACiWoT5EAgK5QC3kc2G5SyH4 vgWvKiA4E1hWAcyVvaPXgC7VZCnyratx2d+FtC0gxbentZg4KuyKgpQ+V xwE3gw5ez//jJ9VS9duunTrXBW2m9y+M39zMEn1BzrpYvgcbW5bEpV3TI qNPRT96otXfOBF8ZBSt99tajJt65E+WR6PArrayVzWnGIUdZWuWQSeZMk 8zFIT3ye26JEfWVWwbBItzOc9K5NQYWngwXvgmXVW6mhkPcQq6UBa1n62 FVPAJgkM3dr+K9US1OqCYNcwiqKjk3kQRI21kv+7H3ih9FvPeCsAAtokF g==; X-CSE-ConnectionGUID: hG7R1pUGQGahpjvxEZllHA== X-CSE-MsgGUID: 3RxcdryvQJ+S2n8TUfs/ow== X-IronPort-AV: E=McAfee;i="6800,10657,11946"; a="1688872" X-IronPort-AV: E=Sophos;i="6.27,179,1787036400"; d="scan'208";a="1688872" Received: from fmviesa007.fm.intel.com ([10.60.135.147]) by orvoesa111.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 Oct 2026 00:40:01 -0700 X-CSE-ConnectionGUID: DjBsxKTBQXO/9JG9HEZ0+w== X-CSE-MsgGUID: 6Yc3T8mTSw2tB+o/Hk3RNg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.27,179,1787036400"; d="scan'208";a="4579501" Received: from unknown (HELO [10.238.0.97]) ([10.238.0.97]) by smtpauth.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 26 Oct 2026 00:39:57 -0700 Message-ID: Date: Mon, 26 Oct 2026 15:39:53 +0800 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC PATCH 14/15] x86/tdx: Add TDG.DMAR.ACCEPT module call wrapper for TDX Connect To: Zhenzhong Duan , x86@kernel.org, linux-coco@lists.linux.dev, linux-kernel@vger.kernel.org Cc: dave.hansen@linux.intel.com, tglx@kernel.org, mingo@redhat.com, bp@alien8.de, hpa@zytor.com, dave.hansen@intel.com, kas@kernel.org, rick.p.edgecombe@intel.com, jgg@nvidia.com, nicolinc@nvidia.com, aik@amd.com, aneesh.kumar@kernel.org, seanjc@google.com, pbonzini@redhat.com, yilun.xu@linux.intel.com, chao.gao@intel.com, vishal.l.verma@intel.com, kevin.tian@intel.com, chao.p.peng@intel.com References: <20260924041032.1096569-1-zhenzhong.duan@intel.com> <20260924041032.1096569-15-zhenzhong.duan@intel.com> Content-Language: en-US From: Xiaoyao Li In-Reply-To: <20260924041032.1096569-15-zhenzhong.duan@intel.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 9/24/2026 12:10 PM, Zhenzhong Duan wrote: > TDG.DMAR.ACCEPT updates the PASID table entry of the TDI as present to > allow DMA access to the TD private memory. > > For TDG.DMAR.ACCEPT, the R8-R15 input registers are reserved and must > be zero. Use a zero-initialized argument structure with __tdcall_saved() > so the complete TDCALL input register set is loaded with the required > values. > > Translate TDX module return codes into Linux errno values. > > Signed-off-by: Zhenzhong Duan > --- > arch/x86/coco/tdx/tdx_connect.c | 28 ++++++++++++++++++++++++++++ > arch/x86/include/asm/shared/tdx.h | 1 + > arch/x86/include/asm/tdx.h | 1 + > 3 files changed, 30 insertions(+) > > diff --git a/arch/x86/coco/tdx/tdx_connect.c b/arch/x86/coco/tdx/tdx_connect.c > index 3ef10b1df401..a03b1da9a52a 100644 > --- a/arch/x86/coco/tdx/tdx_connect.c > +++ b/arch/x86/coco/tdx/tdx_connect.c > @@ -136,3 +136,31 @@ int tdx_mcall_tdi_start(u64 func_id, u64 exp_bind_session) > return tdx_mcall_tdi_to_errno(ret); > } > EXPORT_SYMBOL_FOR_MODULES(tdx_mcall_tdi_start, "tdx-guest"); > + > +/** > + * tdx_mcall_dmar_accept() - Accept PASID table entry of a TDI instance > + * @func_id: Function identifier specifying the TDI instance > + * @target: DMAR target, 0 for non-partitioned TD or L1, 1-3 for L2 VM1-VM3, > + * other value reserved > + * Linux doesn't support TD partition and the next patch just hard codes it to 0. We can drop it entirely for simplicity. > + * Update the PASID table entry of the TDI to mark the DMA Remapping (DMAR) > + * state as present, allowing DMA access to the TD private memory. > + * > + * Return 0 on success, -ENXIO for invalid operands, -EBUSY for busy operation, > + * -ENODEV for TDI not present or invalid metadata, or -EIO on other TDCALL failures. > + */ > +int tdx_mcall_dmar_accept(u64 func_id, u64 target) > +{ > + struct tdx_module_args args = { > + .rcx = func_id, > + .rdx = target, > + }; > + u64 ret; > + > + ret = __tdcall_saved(TDG_DMAR_ACCEPT, &args); > + if (!ret) > + return 0; > + > + return tdx_mcall_tdi_to_errno(ret); > +} > +EXPORT_SYMBOL_FOR_MODULES(tdx_mcall_dmar_accept, "tdx-guest"); > diff --git a/arch/x86/include/asm/shared/tdx.h b/arch/x86/include/asm/shared/tdx.h > index 90f2842f4253..01387f6b24b3 100644 > --- a/arch/x86/include/asm/shared/tdx.h > +++ b/arch/x86/include/asm/shared/tdx.h > @@ -22,6 +22,7 @@ > #define TDG_VM_WR 8 > #define TDG_TDI_READ 67 > #define TDG_TDI_START 68 > +#define TDG_DMAR_ACCEPT 70 > #define TDG_MMIO_ACCEPT 71 > > /* TDX TD attributes */ > diff --git a/arch/x86/include/asm/tdx.h b/arch/x86/include/asm/tdx.h > index 787b3039ef5a..118cc58cc909 100644 > --- a/arch/x86/include/asm/tdx.h > +++ b/arch/x86/include/asm/tdx.h > @@ -157,6 +157,7 @@ u64 tdx_hcall_tdcm(u16 devid, void *buf, size_t size, u8 vector); > int tdx_mcall_tdi_read(u64 func_id, u64 field, u64 *value); > int tdx_mcall_mmio_accept(u64 func_id, u64 index, u32 pg_offset, u32 page_cnt, phys_addr_t gpa); > int tdx_mcall_tdi_start(u64 func_id, u64 exp_bind_session); > +int tdx_mcall_dmar_accept(u64 func_id, u64 target); > #endif > > void __init tdx_dump_attributes(u64 td_attr);