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 43463C83F25 for ; Mon, 14 Jul 2025 08:09:50 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ubEFk-0001Tk-3X; Mon, 14 Jul 2025 04:09:36 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ubE7S-0001Ce-3g for qemu-devel@nongnu.org; Mon, 14 Jul 2025 04:01:02 -0400 Received: from [2001:8b0:10b:1236:d4b0:a112:9c86:6a4b] (helo=casper.infradead.org) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ubE7P-0001Zy-C4 for qemu-devel@nongnu.org; Mon, 14 Jul 2025 04:01:01 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:Date:Cc:To: From:Subject:Message-ID:Sender:Reply-To:Content-Transfer-Encoding:Content-ID: Content-Description:In-Reply-To:References; bh=mzzs7nVr1u4yX/QmCcHFo4EFPfPV2MmPe9xdYmk/yTQ=; b=DnHf0pgqB4RixxI/ow+z0In8PV drtcAA+thrgmUunHgjiyyejquRmoGjx2FOwZ45n8Y0SSca5t/WRZt298WuRZTOYOT09//qPiKhH8H HSnBM9Kjzk7gDMmAsSWF3DtjAitF9XD+uFO3TrLZRxqfWOcVRbW/9ipqdNGnL1UEQXAL7faXwweFH R8srzrgPLgayTGr1KEvemDg91BT4tvlj2/6aVrmsB204QZioDpvq1SbdRsPuzvP0OFXzffV5RalSM kMZmQjULZG9Xe6PYiHgGuXdJazoUK0gd6kmr81QUGAtoRSm0/bEZmYk3fd4JyjtCiqxY30T+m+jg4 GEBzPq+g==; Received: from [2001:bb6:9553:3800:d40b:2334:19cb:4c95] (helo=pool-ipv6-pd.agg7.cky.chf-qkr.eir.ie) by casper.infradead.org with esmtpsa (Exim 4.98.2 #2 (Red Hat Linux)) id 1ubE7F-00000006OZR-0gB6; Mon, 14 Jul 2025 08:00:49 +0000 Message-ID: <0122cbabc0adcc3cf878f5fd7834d8f258c7a2f2.camel@infradead.org> Subject: [PATCH v2] intel_iommu: Allow both Status Write and Interrupt Flag in QI wait From: David Woodhouse To: "Michael S. Tsirkin" , Jason Wang , Le Tan , kib , jhb@freebsd.org Cc: Yi Liu , =?ISO-8859-1?Q?Cl=E9ment?= Mathieu--Drif , Marcel Apfelbaum , Paolo Bonzini , Richard Henderson , Eduardo Habkost , qemu-devel@nongnu.org Date: Mon, 14 Jul 2025 09:00:47 +0100 Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-X4N/RjCf27lJWBaP9t7j" User-Agent: Evolution 3.52.3-0ubuntu1 MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html X-Host-Lookup-Failed: Reverse DNS lookup failed for 2001:8b0:10b:1236:d4b0:a112:9c86:6a4b (failed) Received-SPF: none client-ip=2001:8b0:10b:1236:d4b0:a112:9c86:6a4b; envelope-from=BATV+a0f003c192dcfc477734+7995+infradead.org+dwmw2@casper.srs.infradead.org; helo=casper.infradead.org X-Spam_score_int: -12 X-Spam_score: -1.3 X-Spam_bar: - X-Spam_report: (-1.3 / 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, RDNS_NONE=0.793, SPF_HELO_NONE=0.001, SPF_NONE=0.001 autolearn=no 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: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org --=-X4N/RjCf27lJWBaP9t7j Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable From: David Woodhouse FreeBSD does both, and this appears to be perfectly valid. The VT-d spec even talks about the ordering (the status write should be done first, unsurprisingly). We certainly shouldn't assert() and abort QEMU if the guest asks for both. Fixes: ed7b8fbcfb88 ("intel-iommu: add supports for queued invalidation int= erface") Closes: https://gitlab.com/qemu-project/qemu/-/issues/3028 Signed-off-by: David Woodhouse --- v2: =E2=80=A2 Only generate the interrupt once. =E2=80=A2 Spaces around bitwise OR. This stops QEMU crashing, but I still can't get FreeBSD to boot and use CPUs with APIC ID > 255 using *either* Intel or AMD IOMMU with interrupt remapping, or the native 15-bit APIC ID enlightenment. cf. https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D288122 hw/i386/intel_iommu.c | 15 +++++++++------ 1 file changed, 9 insertions(+), 6 deletions(-) diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c index 69d72ad35c..851c4656c5 100644 --- a/hw/i386/intel_iommu.c +++ b/hw/i386/intel_iommu.c @@ -2822,6 +2822,7 @@ static bool vtd_process_wait_desc(IntelIOMMUState *s,= VTDInvDesc *inv_desc) { uint64_t mask[4] =3D {VTD_INV_DESC_WAIT_RSVD_LO, VTD_INV_DESC_WAIT_RSV= D_HI, VTD_INV_DESC_ALL_ONE, VTD_INV_DESC_ALL_ONE}; + bool ret =3D true; =20 if (!vtd_inv_desc_reserved_check(s, inv_desc, mask, false, __func__, "wait")) { @@ -2833,8 +2834,6 @@ static bool vtd_process_wait_desc(IntelIOMMUState *s,= VTDInvDesc *inv_desc) uint32_t status_data =3D (uint32_t)(inv_desc->lo >> VTD_INV_DESC_WAIT_DATA_SHIFT); =20 - assert(!(inv_desc->lo & VTD_INV_DESC_WAIT_IF)); - /* FIXME: need to be masked with HAW? */ dma_addr_t status_addr =3D inv_desc->hi; trace_vtd_inv_desc_wait_sw(status_addr, status_data); @@ -2843,18 +2842,22 @@ static bool vtd_process_wait_desc(IntelIOMMUState *= s, VTDInvDesc *inv_desc) &status_data, sizeof(status_data), MEMTXATTRS_UNSPECIFIED)) { trace_vtd_inv_desc_wait_write_fail(inv_desc->hi, inv_desc->lo)= ; - return false; + ret =3D false; } - } else if (inv_desc->lo & VTD_INV_DESC_WAIT_IF) { + } + + if (inv_desc->lo & VTD_INV_DESC_WAIT_IF) { /* Interrupt flag */ vtd_generate_completion_event(s); - } else { + } + + if (!(inv_desc->lo & (VTD_INV_DESC_WAIT_IF | VTD_INV_DESC_WAIT_SW))) { error_report_once("%s: invalid wait desc: hi=3D%"PRIx64", lo=3D%"P= RIx64 " (unknown type)", __func__, inv_desc->hi, inv_desc->lo); return false; } - return true; + return ret; } =20 static bool vtd_process_context_cache_desc(IntelIOMMUState *s, --=20 2.43.0 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