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dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=iommu-bounces@lists.linux-foundation.org Received: from mail.linux-foundation.org (localhost [127.0.0.1]) by mail.linuxfoundation.org (Postfix) with ESMTP id 6C089C64; Fri, 8 Nov 2019 10:33:04 +0000 (UTC) Received: from smtp1.linuxfoundation.org (smtp1.linux-foundation.org [172.17.192.35]) by mail.linuxfoundation.org (Postfix) with ESMTPS id E53F6AD0 for ; Fri, 8 Nov 2019 10:33:03 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from us-smtp-1.mimecast.com (us-smtp-2.mimecast.com [207.211.31.81]) by smtp1.linuxfoundation.org (Postfix) with ESMTP id 6C6C2EC for ; Fri, 8 Nov 2019 10:33:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1573209182; h=from:from:reply-to:subject:subject: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=GJIemJ28V7SlVdwM6PWNhep+T2p/t4Izn4GDnmEe/tw=; b=UcenVrjzlY4xcfplDTmN7ODuVN19AxU1j5VE2fUWjxQ6NsLYvClZjurgVbxjNf2e1uvFoa N8ZlV2HtqXN3Xb5bSHK8knHGLWsgBwVh2zsx72FsiC9gnIMzbS6on9UHDDVnJoAr6WMaJ7 YCRk/qDhG52F6UQW+qpeUHObadf+Cp4= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-385-aPiaQ9JyNAWA4YQ0AdCh0w-1; Fri, 08 Nov 2019 05:32:58 -0500 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 4195D800C72; Fri, 8 Nov 2019 10:32:56 +0000 (UTC) Received: from [10.36.116.54] (ovpn-116-54.ams2.redhat.com [10.36.116.54]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 4F2931A8D8; Fri, 8 Nov 2019 10:32:53 +0000 (UTC) From: Auger Eric Subject: Re: [PATCH v7 01/11] iommu/vt-d: Cache virtual command capability register To: Jacob Pan , iommu@lists.linux-foundation.org, LKML , Joerg Roedel , David Woodhouse , Alex Williamson , Jean-Philippe Brucker References: <1571946904-86776-1-git-send-email-jacob.jun.pan@linux.intel.com> <1571946904-86776-2-git-send-email-jacob.jun.pan@linux.intel.com> Message-ID: Date: Fri, 8 Nov 2019 11:32:51 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0 MIME-Version: 1.0 In-Reply-To: <1571946904-86776-2-git-send-email-jacob.jun.pan@linux.intel.com> Content-Language: en-US X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-MC-Unique: aPiaQ9JyNAWA4YQ0AdCh0w-1 X-Mimecast-Spam-Score: 0 Cc: "Tian, Kevin" , Raj Ashok , Jonathan Cameron X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: iommu-bounces@lists.linux-foundation.org Errors-To: iommu-bounces@lists.linux-foundation.org Hi Jacob, On 10/24/19 9:54 PM, Jacob Pan wrote: > Virtual command registers are used in the guest only, to prevent > vmexit cost, we cache the capability and store it during initialization. > > Signed-off-by: Jacob Pan > --- > drivers/iommu/dmar.c | 1 + > include/linux/intel-iommu.h | 4 ++++ > 2 files changed, 5 insertions(+) > > diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c > index eecd6a421667..49bb7d76e646 100644 > --- a/drivers/iommu/dmar.c > +++ b/drivers/iommu/dmar.c > @@ -950,6 +950,7 @@ static int map_iommu(struct intel_iommu *iommu, u64 phys_addr) > warn_invalid_dmar(phys_addr, " returns all ones"); > goto unmap; > } > + iommu->vccap = dmar_readq(iommu->reg + DMAR_VCCAP_REG); > > /* the registers might be more than one page */ > map_size = max_t(int, ecap_max_iotlb_offset(iommu->ecap), > diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h > index ed11ef594378..2e1bed9b7eef 100644 > --- a/include/linux/intel-iommu.h > +++ b/include/linux/intel-iommu.h > @@ -186,6 +186,9 @@ > #define ecap_max_handle_mask(e) ((e >> 20) & 0xf) > #define ecap_sc_support(e) ((e >> 7) & 0x1) /* Snooping Control */ > > +/* Virtual command interface capabilities */ > +#define vccap_pasid(v) ((v & DMA_VCS_PAS)) /* PASID allocation */ > + > /* IOTLB_REG */ > #define DMA_TLB_FLUSH_GRANU_OFFSET 60 > #define DMA_TLB_GLOBAL_FLUSH (((u64)1) << 60) > @@ -520,6 +523,7 @@ struct intel_iommu { > u64 reg_size; /* size of hw register set */ > u64 cap; > u64 ecap; > + u64 vccap; > u32 gcmd; /* Holds TE, EAFL. Don't need SRTP, SFL, WBF */ > raw_spinlock_t register_lock; /* protect register handling */ > int seq_id; /* sequence id of the iommu */ > with DMA_VCS_PAS's move in this patch as pointed out by Kevin or vccap_pasid() move to patch 3, feel free to add Reviewed-by: Eric Auger Eric _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu