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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 5E400C433F5 for ; Fri, 3 Dec 2021 11:04:06 +0000 (UTC) Received: from localhost ([::1]:50808 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mt6MF-0002O0-8p for qemu-devel@archiver.kernel.org; Fri, 03 Dec 2021 06:04:04 -0500 Received: from eggs.gnu.org ([209.51.188.92]:50760) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mt65k-0007R0-3w for qemu-devel@nongnu.org; Fri, 03 Dec 2021 05:47:00 -0500 Received: from [2607:7c80:54:e::133] (port=41934 helo=bombadil.infradead.org) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mt65f-0007ZV-Ti for qemu-devel@nongnu.org; Fri, 03 Dec 2021 05:46:59 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=MIME-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=00RmczPDDgNMsZyOCFwWbdd7sIMAXQ73fx26MnbbYkY=; b=Tk34OFb63Y8zXEYSwEHK0kZ5gh 9XfG86tq9ZPugCg1G3I/2UkIu1v0jCZskIz4qJKH0o8bkRO5hy1wIywqx6716UzDz2Ri6yHouJ9xm zZ6OT5WA/kkTuAWY9r2jc7yZmyzhkJp4tF7hKjmm9uNolRWL2er74lzXmLb2rJgisH8HRiId9tHMk KumjjTGd49qPxoCKPLHG8zwPj3EqjYILLBu/lehT6n+CuJFZvy1Q0P21KmttNDzWHMAbMk2/noeSl 74Yu7EFt/LFGbarSy4l0OZJS2ogYgzay6HxkIX7Gp65R1gdSvAxjKLgKIyBpxuHK/QwkBw/iIfxhn 4km81gxw==; Received: from 54-240-197-239.amazon.com ([54.240.197.239] helo=freeip.amazon.com) by bombadil.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1mt65Z-00FEM0-C9; Fri, 03 Dec 2021 10:46:49 +0000 Message-ID: Subject: Re: [PATCH 1/2] intel_iommu: Support IR-only mode without DMA translation From: David Woodhouse To: Peter Xu , Jason Wang Date: Fri, 03 Dec 2021 10:46:46 +0000 In-Reply-To: References: <20211201205113.57299-1-dwmw2@infradead.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-P5d2fQ8uktE1p1Z55Y0c" User-Agent: Evolution 3.36.5-0ubuntu1 MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html X-Host-Lookup-Failed: Reverse DNS lookup failed for 2607:7c80:54:e::133 (failed) Received-SPF: none client-ip=2607:7c80:54:e::133; envelope-from=BATV+b09ca3440ca12902e654+6676+infradead.org+dwmw2@bombadil.srs.infradead.org; helo=bombadil.infradead.org X-Spam_score_int: -35 X-Spam_score: -3.6 X-Spam_bar: --- X-Spam_report: (-3.6 / 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, RCVD_IN_DNSWL_MED=-2.3, RDNS_NONE=0.793, 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: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Paolo Bonzini , "Michael S. Tsirkin" , Richard Henderson , qemu-devel , Eduardo Habkost Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" --=-P5d2fQ8uktE1p1Z55Y0c Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2021-12-03 at 15:38 +0800, Peter Xu wrote: > On Thu, Dec 02, 2021 at 11:49:25AM +0800, Jason Wang wrote: > > On Thu, Dec 2, 2021 at 4:55 AM David Woodhouse wr= ote: > > > 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=20 > > > https://git.kernel.org/torvalds/c/c40aaaac10 > > >=20 > > >=20 > > > Signed-off-by: David Woodhouse > > > --- > > > 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 294499ee20..ffc852d110 100644 > > > --- a/hw/i386/intel_iommu.c > > > +++ b/hw/i386/intel_iommu.c > > > @@ -2202,7 +2202,7 @@ static void vtd_handle_gcmd_write(IntelIOMMUSta= te *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); > > > } > > > @@ -3100,6 +3100,7 @@ static Property vtd_properties[] =3D { > > > DEFINE_PROP_BOOL("caching-mode", IntelIOMMUState, caching_mode, = FALSE), > > > DEFINE_PROP_BOOL("x-scalable-mode", IntelIOMMUState, scalable_mo= de, FALSE), > > > DEFINE_PROP_BOOL("dma-drain", IntelIOMMUState, dma_drain, true), > > > + DEFINE_PROP_BOOL("dma-translation", IntelIOMMUState, dma_transla= tion, true), > > > DEFINE_PROP_END_OF_LIST(), > > > }; > > >=20 > > > @@ -3605,12 +3606,17 @@ 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; > > > + } > > > } > >=20 > > Just wonder if this is the hardware behaviour as I see 0 is reserved > > for SAGAW in vtd 3.3 spec. >=20 > Yes I have the same question. But if latest Linux & Windows work fine th= en it > seems ok if we have explicit use scenario with enabling IR only. Bit zero is reserved. The *value* zero is just what you get when none of the bits are set. "A value of 1 in any of these bits indicates the corresponding adjusted guest address width is supported.The adjusted guest address widths corresponding to various bit positions within this field are: =E2=80=A2 0: Reserved =E2=80=A2 1: 39-bit AGAW (3-level page-table) =E2=80=A2 2: 48-bit AGAW (4-level page-table) =E2=80=A2 3: 57-bit AGAW (5-level page-table) =E2=80=A2 4: Reserved Software must ensure that the adjusted guest address width used to set up the page tables is one of the supported guest address widths reported in this field. Hardware implementations reporting second-level translation support (SLTS) field as Clear also report this field as 0. =20 > In that case commenting with some details would be more than welcomed, e.= g. > mentioning Linux commit c40aaaac1018 ("iommu/vt-d: Gracefully handle DMAR= units > with no supported address widths", 2020-10-07) as comments above the code= . >=20 > One more question: SAGAW is a bitmask, is it intended to only set 1 bit o= ut of > the mask? I'm afraid it could break guest OS that only support 39 bits w= hen > the qemu cmdline has aw-bits=3D48 specified. No, we should set all bits that correspond to supported page table depths. And I believe we still do; there's no 'else' in the patch above so it will set *both* the 39-bit and 48-bit support bits if s->aw_bits is high enough to support both. --=-P5d2fQ8uktE1p1Z55Y0c Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCECow ggUcMIIEBKADAgECAhEA4rtJSHkq7AnpxKUY8ZlYZjANBgkqhkiG9w0BAQsFADCBlzELMAkGA1UE BhMCR0IxGzAZBgNVBAgTEkdyZWF0ZXIgTWFuY2hlc3RlcjEQMA4GA1UEBxMHU2FsZm9yZDEaMBgG A1UEChMRQ09NT0RPIENBIExpbWl0ZWQxPTA7BgNVBAMTNENPTU9ETyBSU0EgQ2xpZW50IEF1dGhl bnRpY2F0aW9uIGFuZCBTZWN1cmUgRW1haWwgQ0EwHhcNMTkwMTAyMDAwMDAwWhcNMjIwMTAxMjM1 OTU5WjAkMSIwIAYJKoZIhvcNAQkBFhNkd213MkBpbmZyYWRlYWQub3JnMIIBIjANBgkqhkiG9w0B AQEFAAOCAQ8AMIIBCgKCAQEAsv3wObLTCbUA7GJqKj9vHGf+Fa+tpkO+ZRVve9EpNsMsfXhvFpb8 RgL8vD+L133wK6csYoDU7zKiAo92FMUWaY1Hy6HqvVr9oevfTV3xhB5rQO1RHJoAfkvhy+wpjo7Q 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