From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-20.1 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_2 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 176F0C433E6 for ; Fri, 22 Jan 2021 15:18:53 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 2D4C0235DD for ; Fri, 22 Jan 2021 15:18:52 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2D4C0235DD Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:37006 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1l2yD5-0003IW-2w for qemu-devel@archiver.kernel.org; Fri, 22 Jan 2021 10:18:51 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:35006) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1l2y91-0001L6-Q0 for qemu-devel@nongnu.org; Fri, 22 Jan 2021 10:14:40 -0500 Received: from merlin.infradead.org ([2001:8b0:10b:1231::1]:44412) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1l2y8y-0001pH-GL for qemu-devel@nongnu.org; Fri, 22 Jan 2021 10:14:39 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=merlin.20170209; h=Mime-Version:Content-Type:References: In-Reply-To:Date:To:From:Subject:Message-ID:Sender:Reply-To:Cc: Content-Transfer-Encoding:Content-ID:Content-Description; bh=oN7FnVE46BCuhpY3+vdFHlBtz9I12c2bQGRLFdq5sAQ=; b=qjy5WPJ4f9BqZiw6F6MrC0TmBc J8s9lgb+aaSTv3U5ydN/kNT50xS9UoMx+VTnEmnDpmYPoaUyS+KuGbYL8fAL0W8LUREYiVlaIs60n FJkbM75t56ombOOb9v4hq3cTMhcahlnFLdrniY4jCppCp7w0Waz71y3rWJTXC5BhQbAqv91AnGmLJ /lLA+slFmHGapKayJTrj+WLU2X0cyBpmF4iJViO/FLzmG0/hOfUj9bg+ZubyTTaZ4EgR02ibiu5AW nI26itU+C8EWoUAol3OI9gKQLSyufDlRRu5NJPgOtpIo9TOMqo+w5cCxA/ojHkFNNJSkWNPp7SwdG H1AORyvQ==; Received: from [54.239.6.188] (helo=freeip.amazon.com) by merlin.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1l2y8o-0006Zc-HT for qemu-devel@nongnu.org; Fri, 22 Jan 2021 15:14:26 +0000 Message-ID: Subject: Re: [PATCH 1/2] intel_iommu: Support IR-only mode without DMA translation From: David Woodhouse To: qemu-devel@nongnu.org Date: Fri, 22 Jan 2021 15:14:23 +0000 In-Reply-To: <20201015183457.1719068-1-dwmw2@infradead.org> References: <20201015183457.1719068-1-dwmw2@infradead.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-otOXUXWyr6EUwwkxxHL/" X-Mailer: Evolution 3.28.5-0ubuntu0.18.04.2 Mime-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by merlin.infradead.org. See http://www.infradead.org/rpr.html Received-SPF: none client-ip=2001:8b0:10b:1231::1; envelope-from=BATV+efc53580779a980953e1+6361+infradead.org+dwmw2@merlin.srs.infradead.org; helo=merlin.infradead.org X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_NONE=0.001, SPF_NONE=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" --=-otOXUXWyr6EUwwkxxHL/ Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2020-10-15 at 19:34 +0100, David Woodhouse wrote: > From: David Woodhouse >=20 > By setting none of the SAGAW bits we can indicate to a guest that DMA > translation isn't supported. Tested by booting Windows 10, as well as > Linux guests with the fix at https://git.kernel.org/torvalds/c/c40aaaac10 >=20 > Signed-off-by: David Woodhouse Shall I resend these? They still seem to apply cleanly. > --- > hw/i386/intel_iommu.c | 14 ++++++++++---- > include/hw/i386/intel_iommu.h | 1 + > 2 files changed, 11 insertions(+), 4 deletions(-) >=20 > diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c > index 749eb6ad63..f49b4af931 100644 > --- a/hw/i386/intel_iommu.c > +++ b/hw/i386/intel_iommu.c > @@ -2189,7 +2189,7 @@ static void vtd_handle_gcmd_write(IntelIOMMUState *= s) > uint32_t changed =3D status ^ val; > =20 > trace_vtd_reg_write_gcmd(status, val); > - if (changed & VTD_GCMD_TE) { > + if ((changed & VTD_GCMD_TE) && s->dma_translation) { > /* Translation enable/disable */ > vtd_handle_gcmd_te(s, val & VTD_GCMD_TE); > } > @@ -3086,6 +3086,7 @@ static Property vtd_properties[] =3D { > DEFINE_PROP_BOOL("caching-mode", IntelIOMMUState, caching_mode, FALS= E), > DEFINE_PROP_BOOL("x-scalable-mode", IntelIOMMUState, scalable_mode, = FALSE), > DEFINE_PROP_BOOL("dma-drain", IntelIOMMUState, dma_drain, true), > + DEFINE_PROP_BOOL("dma-translation", IntelIOMMUState, dma_translation= , true), > DEFINE_PROP_END_OF_LIST(), > }; > =20 > @@ -3607,12 +3608,17 @@ static void vtd_init(IntelIOMMUState *s) > s->next_frcd_reg =3D 0; > s->cap =3D VTD_CAP_FRO | VTD_CAP_NFR | VTD_CAP_ND | > VTD_CAP_MAMV | VTD_CAP_PSI | VTD_CAP_SLLPS | > - VTD_CAP_SAGAW_39bit | VTD_CAP_MGAW(s->aw_bits); > + VTD_CAP_MGAW(s->aw_bits); > if (s->dma_drain) { > s->cap |=3D VTD_CAP_DRAIN; > } > - if (s->aw_bits =3D=3D VTD_HOST_AW_48BIT) { > - s->cap |=3D VTD_CAP_SAGAW_48bit; > + if (s->dma_translation) { > + if (s->aw_bits >=3D VTD_HOST_AW_39BIT) { > + s->cap |=3D VTD_CAP_SAGAW_39bit; > + } > + if (s->aw_bits >=3D VTD_HOST_AW_48BIT) { > + s->cap |=3D VTD_CAP_SAGAW_48bit; > + } > } > s->ecap =3D VTD_ECAP_QI | VTD_ECAP_IRO; > =20 > diff --git a/include/hw/i386/intel_iommu.h b/include/hw/i386/intel_iommu.= h > index 41783ee46d..42d6a6a636 100644 > --- a/include/hw/i386/intel_iommu.h > +++ b/include/hw/i386/intel_iommu.h > @@ -266,6 +266,7 @@ struct IntelIOMMUState { > bool buggy_eim; /* Force buggy EIM unless eim=3Doff = */ > uint8_t aw_bits; /* Host/IOVA address width (in bits)= */ > bool dma_drain; /* Whether DMA r/w draining enabled = */ > + bool dma_translation; /* Whether DMA translation supported= */ > =20 > /* > * Protects IOMMU states in general. 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