linux-kernel - [PATCH 3.16 189/306] iommu/vt-d: Fix IOMMU lookup for SR-IOV Virtual Functions

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Message-ID: <lsq.1487198500.757145683@decadent.org.uk>
Date:   Wed, 15 Feb 2017 22:41:40 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Sainath Grandhi" <sainath.grandhi@...el.com>,
        "David Woodhouse" <dwmw2@...radead.org>,
        "Ashok Raj" <ashok.raj@...el.com>
Subject: [PATCH 3.16 189/306] iommu/vt-d: Fix IOMMU lookup for SR-IOV
 Virtual Functions

3.16.40-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Ashok Raj <ashok.raj@...el.com>

commit 1c387188c60f53b338c20eee32db055dfe022a9b upstream.

The VT-d specification (§8.3.3) says:
    ‘Virtual Functions’ of a ‘Physical Function’ are under the scope
    of the same remapping unit as the ‘Physical Function’.

The BIOS is not required to list all the possible VFs in the scope
tables, and arguably *shouldn't* make any attempt to do so, since there
could be a huge number of them.

This has been broken basically for ever — the VF is never going to match
against a specific unit's scope, so it ends up being assigned to the
INCLUDE_ALL IOMMU. Which was always actually correct by coincidence, but
now we're looking at Root-Complex integrated devices with SR-IOV support
it's going to start being wrong.

Fix it to simply use pci_physfn() before doing the lookup for PCI devices.

Signed-off-by: Sainath Grandhi <sainath.grandhi@...el.com>
Signed-off-by: Ashok Raj <ashok.raj@...el.com>
Signed-off-by: David Woodhouse <dwmw2@...radead.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/iommu/dmar.c        |  4 +++-
 drivers/iommu/intel-iommu.c | 13 +++++++++++++
 2 files changed, 16 insertions(+), 1 deletion(-)

--- a/drivers/iommu/dmar.c
+++ b/drivers/iommu/dmar.c
@@ -299,7 +299,9 @@ static int dmar_pci_bus_notifier(struct
 	struct pci_dev *pdev = to_pci_dev(data);
 	struct dmar_pci_notify_info *info;
 
-	/* Only care about add/remove events for physical functions */
+	/* Only care about add/remove events for physical functions.
+	 * For VFs we actually do the lookup based on the corresponding
+	 * PF in device_to_iommu() anyway. */
 	if (pdev->is_virtfn)
 		return NOTIFY_DONE;
 	if (action != BUS_NOTIFY_ADD_DEVICE && action != BUS_NOTIFY_DEL_DEVICE)
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -684,7 +684,13 @@ static struct intel_iommu *device_to_iom
 		return NULL;
 
 	if (dev_is_pci(dev)) {
+		struct pci_dev *pf_pdev;
+
 		pdev = to_pci_dev(dev);
+		/* VFs aren't listed in scope tables; we need to look up
+		 * the PF instead to find the IOMMU. */
+		pf_pdev = pci_physfn(pdev);
+		dev = &pf_pdev->dev;
 		segment = pci_domain_nr(pdev->bus);
 	} else if (ACPI_COMPANION(dev))
 		dev = &ACPI_COMPANION(dev)->dev;
@@ -697,6 +703,13 @@ static struct intel_iommu *device_to_iom
 		for_each_active_dev_scope(drhd->devices,
 					  drhd->devices_cnt, i, tmp) {
 			if (tmp == dev) {
+				/* For a VF use its original BDF# not that of the PF
+				 * which we used for the IOMMU lookup. Strictly speaking
+				 * we could do this for all PCI devices; we only need to
+				 * get the BDF# from the scope table for ACPI matches. */
+				if (pdev->is_virtfn)
+					goto got_pdev;
+
 				*bus = drhd->devices[i].bus;
 				*devfn = drhd->devices[i].devfn;
 				goto out;