From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A254C223DC6; Sat, 30 May 2026 18:13:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780164798; cv=none; b=I2OrV8c/Ckr0kMSqyG+N7QgRLnXQT97s5Qez+lOjzzA6TGiUa6K6wRl2e4m6xx23luN2Fzd5GJ0kUYtgdVwLPDVsZd5MJDaQOUuxXXqTYlaTCzG6unCvrYeR1rsUGMVHUyMhVexexMh42z6q6UZf9KKSzwotC5iEtSAVWxeOj60= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780164798; c=relaxed/simple; bh=mTxM1pSBtlhEk5TKeik3O2e5rVnI5holvkpPPXo0o7w=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=DsTalfMNGnxFiH4FmM0RC3lBF6vVqiFBTCH1IKP0OQP52D/HE14B7LxlVWlWMnjkhsNAkP49kP6TGsqjkFoTpyh6ilma1ERQRf6TgoFbXuHApS+auvDuFxaAt84ToVyaNZIr/29U1Pn5gNQr12vZzEVHMimV9Mm2VcGgcBMdKLc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=V+eUiv5+; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="V+eUiv5+" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E7C4D1F00893; Sat, 30 May 2026 18:13:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1780164797; bh=ER0MZJro7tmZxHffNnyNEuuRCnmwMSSX6ZSLC3eFWSo=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=V+eUiv5+/p/5CsxSX8au2a6w4Yr3aC9eIV2K2IGg7jlnI7q06m7KlTDS0fnwGsOfn CB72b3xLQbu80AapUSOWCNx6D9+DuzGig2lZ86bI3X9XW45r9pEvs4G1teaajBk+rc 57SAWYt2om5HEl0OOvvsL4UREs5YC+EgMpp/qL9I= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, =?UTF-8?q?Naval=20Alcal=C3=A1?= , Lu Baolu , Joerg Roedel Subject: [PATCH 5.15 663/776] iommu/vt-d: Disable DMAR for Intel Q35 IGFX Date: Sat, 30 May 2026 18:06:17 +0200 Message-ID: <20260530160257.028093070@linuxfoundation.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260530160240.228940103@linuxfoundation.org> References: <20260530160240.228940103@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Naval Alcalá commit 2cda2e10dc8343ae01eae9e999a876b7e7d37861 upstream. Intel Q35 integrated graphics (8086:29b2) exhibits broken DMAR behaviour similar to other G4x/GM45 devices for which DMAR is already disabled via quirks. When DMAR is enabled, the system may hard lock up during boot or early device initialization, requiring a reset. Add the missing PCI ID to the existing quirk list to disable DMAR for this device. Fixes: 1f76249cc3be ("iommu/vt-d: Declare Broadwell igfx dmar support snafu") Cc: stable@vger.kernel.org Closes: https://bugzilla.kernel.org/show_bug.cgi?id=201185 Closes: https://bugzilla.kernel.org/show_bug.cgi?id=216064 Signed-off-by: Naval Alcalá Link: https://lore.kernel.org/r/20260410161622.13549-1-ari@naval.cat Signed-off-by: Lu Baolu Signed-off-by: Joerg Roedel Signed-off-by: Greg Kroah-Hartman --- drivers/iommu/intel/iommu.c | 3 +++ 1 file changed, 3 insertions(+) --- a/drivers/iommu/intel/iommu.c +++ b/drivers/iommu/intel/iommu.c @@ -5651,6 +5651,9 @@ static void quirk_iommu_igfx(struct pci_ dmar_map_gfx = 0; } +/* Q35 integrated gfx dmar support is totally busted. */ +DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x29b2, quirk_iommu_igfx); + /* G4x/GM45 integrated gfx dmar support is totally busted. */ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x2a40, quirk_iommu_igfx); DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x2e00, quirk_iommu_igfx);