[Xen-devel] [PATCH v2 11/11] vt-d: propagate error up to ME phantom function mapping and unmapping

[Quan Xu <quan.xu@xxxxxxxxx>]

While IOMMU Device-TLB flush timed out, xen calls panic() at present.
However the existing panic() is going to be eliminated, so we must
propagate the IOMMU Device-TLB flush error up to  ME phantom function
mapping and unmapping.

Signed-off-by: Quan Xu <quan.xu@xxxxxxxxx>

CC: Jan Beulich <jbeulich@xxxxxxxx>
CC: Kevin Tian <kevin.tian@xxxxxxxxx>
CC: Feng Wu <feng.wu@xxxxxxxxx>
---
 xen/drivers/passthrough/vtd/extern.h |  2 +-
 xen/drivers/passthrough/vtd/quirks.c | 26 ++++++++++++++++----------
 2 files changed, 17 insertions(+), 11 deletions(-)

diff --git a/xen/drivers/passthrough/vtd/extern.h 
b/xen/drivers/passthrough/vtd/extern.h
index cbe0286..d4d37c3 100644
--- a/xen/drivers/passthrough/vtd/extern.h
+++ b/xen/drivers/passthrough/vtd/extern.h
@@ -91,7 +91,7 @@ int is_igd_vt_enabled_quirk(void);
 void platform_quirks_init(void);
 void vtd_ops_preamble_quirk(struct iommu* iommu);
 void vtd_ops_postamble_quirk(struct iommu* iommu);
-void me_wifi_quirk(struct domain *domain, u8 bus, u8 devfn, int map);
+int me_wifi_quirk(struct domain *domain, u8 bus, u8 devfn, int map);
 void pci_vtd_quirk(const struct pci_dev *);
 bool_t platform_supports_intremap(void);
 bool_t platform_supports_x2apic(void);
diff --git a/xen/drivers/passthrough/vtd/quirks.c 
b/xen/drivers/passthrough/vtd/quirks.c
index 49df41d..c6d9a03 100644
--- a/xen/drivers/passthrough/vtd/quirks.c
+++ b/xen/drivers/passthrough/vtd/quirks.c
@@ -332,10 +332,11 @@ void __init platform_quirks_init(void)
  * assigning Intel integrated wifi device to a guest.
  */
 
-static void map_me_phantom_function(struct domain *domain, u32 dev, int map)
+static int map_me_phantom_function(struct domain *domain, u32 dev, int map)
 {
     struct acpi_drhd_unit *drhd;
     struct pci_dev *pdev;
+    int rc;
 
     /* find ME VT-d engine base on a real ME device */
     pdev = pci_get_pdev(0, 0, PCI_DEVFN(dev, 0));
@@ -343,23 +344,26 @@ static void map_me_phantom_function(struct domain 
*domain, u32 dev, int map)
 
     /* map or unmap ME phantom function */
     if ( map )
-        domain_context_mapping_one(domain, drhd->iommu, 0,
-                                   PCI_DEVFN(dev, 7), NULL);
+        rc = domain_context_mapping_one(domain, drhd->iommu, 0,
+                                        PCI_DEVFN(dev, 7), NULL);
     else
-        domain_context_unmap_one(domain, drhd->iommu, 0,
-                                 PCI_DEVFN(dev, 7));
+        rc = domain_context_unmap_one(domain, drhd->iommu, 0,
+                                      PCI_DEVFN(dev, 7));
+
+    return rc;
 }
 
-void me_wifi_quirk(struct domain *domain, u8 bus, u8 devfn, int map)
+int me_wifi_quirk(struct domain *domain, u8 bus, u8 devfn, int map)
 {
     u32 id;
+    int rc = 0;
 
     id = pci_conf_read32(0, 0, 0, 0, 0);
     if ( IS_CTG(id) )
     {
         /* quit if ME does not exist */
         if ( pci_conf_read32(0, 0, 3, 0, 0) == 0xffffffff )
-            return;
+            return 0;
 
         /* if device is WLAN device, map ME phantom device 0:3.7 */
         id = pci_conf_read32(0, bus, PCI_SLOT(devfn), PCI_FUNC(devfn), 0);
@@ -373,7 +377,7 @@ void me_wifi_quirk(struct domain *domain, u8 bus, u8 devfn, 
int map)
             case 0x423b8086:
             case 0x423c8086:
             case 0x423d8086:
-                map_me_phantom_function(domain, 3, map);
+                rc = map_me_phantom_function(domain, 3, map);
                 break;
             default:
                 break;
@@ -383,7 +387,7 @@ void me_wifi_quirk(struct domain *domain, u8 bus, u8 devfn, 
int map)
     {
         /* quit if ME does not exist */
         if ( pci_conf_read32(0, 0, 22, 0, 0) == 0xffffffff )
-            return;
+            return 0;
 
         /* if device is WLAN device, map ME phantom device 0:22.7 */
         id = pci_conf_read32(0, bus, PCI_SLOT(devfn), PCI_FUNC(devfn), 0);
@@ -399,12 +403,14 @@ void me_wifi_quirk(struct domain *domain, u8 bus, u8 
devfn, int map)
             case 0x42388086:        /* Puma Peak */
             case 0x422b8086:
             case 0x422c8086:
-                map_me_phantom_function(domain, 22, map);
+                rc = map_me_phantom_function(domain, 22, map);
                 break;
             default:
                 break;
         }
     }
+
+    return rc;
 }
 
 void pci_vtd_quirk(const struct pci_dev *pdev)
-- 
1.9.1


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