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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Joerg Roedel <jroedel@suse.de>,
        Lu Baolu <baolu.lu@linux.intel.com>,
        iommu@lists.linux-foundation.org,
        Jerry Snitselaar <jsnitsel@redhat.com>
Subject: [PATCH 5.4 371/434] iommu/vt-d: Allocate reserved region for ISA with correct permission
Date:   Sun, 29 Dec 2019 18:27:04 +0100
Message-Id: <20191229172726.637712160@linuxfoundation.org>
In-Reply-To: <20191229172702.393141737@linuxfoundation.org>
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From: Jerry Snitselaar <jsnitsel@redhat.com>

commit cde9319e884eb6267a0df446f3c131fe1108defb upstream.

Currently the reserved region for ISA is allocated with no
permissions. If a dma domain is being used, mapping this region will
fail. Set the permissions to DMA_PTE_READ|DMA_PTE_WRITE.

Cc: Joerg Roedel <jroedel@suse.de>
Cc: Lu Baolu <baolu.lu@linux.intel.com>
Cc: iommu@lists.linux-foundation.org
Cc: stable@vger.kernel.org # v5.3+
Fixes: d850c2ee5fe2 ("iommu/vt-d: Expose ISA direct mapping region via iommu_get_resv_regions")
Signed-off-by: Jerry Snitselaar <jsnitsel@redhat.com>
Acked-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/iommu/intel-iommu.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -5697,7 +5697,7 @@ static void intel_iommu_get_resv_regions
 		struct pci_dev *pdev = to_pci_dev(device);
 
 		if ((pdev->class >> 8) == PCI_CLASS_BRIDGE_ISA) {
-			reg = iommu_alloc_resv_region(0, 1UL << 24, 0,
+			reg = iommu_alloc_resv_region(0, 1UL << 24, prot,
 						   IOMMU_RESV_DIRECT_RELAXABLE);
 			if (reg)
 				list_add_tail(&reg->list, head);