[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Xen-devel] [PATCH] AMD IOMMU: fail if there is no southbridge IO-APIC



On 02/07/2014 04:21 AM, Jan Beulich wrote:
... but interrupt remapping is requested (with per-device remapping
tables). Without it, the timer interrupt is usually not working.

Inspired by Linux'es "iommu/amd: Work around wrong IOAPIC device-id in
IVRS table" (commit c2ff5cf5294bcbd7fa50f7d860e90a66db7e5059) by Joerg
Roedel <joerg.roedel@xxxxxxx>.

Reported-by: Eric Houby <ehouby@xxxxxxxxx>
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Tested-by: Eric Houby <ehouby@xxxxxxxxx>

--- a/xen/drivers/passthrough/amd/iommu_acpi.c
+++ b/xen/drivers/passthrough/amd/iommu_acpi.c
@@ -984,6 +984,7 @@ static int __init parse_ivrs_table(struc
     const struct acpi_ivrs_header *ivrs_block;
     unsigned long length;
     unsigned int apic;
+    bool_t sb_ioapic = !iommu_intremap;
     int error = 0;
 
     BUG_ON(!table);
@@ -1017,8 +1018,15 @@ static int __init parse_ivrs_table(struc
     /* Each IO-APIC must have been mentioned in the table. */
     for ( apic = 0; !error && iommu_intremap && apic < nr_ioapics; ++apic )
     {
-        if ( !nr_ioapic_entries[apic] ||
-             ioapic_sbdf[IO_APIC_ID(apic)].pin_2_idx )
+        if ( !nr_ioapic_entries[apic] )
+            continue;
+
+        if ( !ioapic_sbdf[IO_APIC_ID(apic)].seg &&
+             /* SB IO-APIC is always on this device in AMD systems. */
+             ioapic_sbdf[IO_APIC_ID(apic)].bdf == PCI_BDF(0, 0x14, 0) )
+            sb_ioapic = 1;
+
+        if ( ioapic_sbdf[IO_APIC_ID(apic)].pin_2_idx )
             continue;
 
         if ( !test_bit(IO_APIC_ID(apic), ioapic_cmdline) )

I don't know whether 0:14:0 is set in stone, I don't remember seeing anywhere that this is architectural.

In the (unlikely) event that it is moved somewhere else will the user be able to overwrite where it is? Do you
think that sb_ioapic may need to be set to true if appropriate bit is set in ioapic_cmdline?

-boris


@@ -1041,6 +1049,14 @@ static int __init parse_ivrs_table(struc
         }
     }
 
+    if ( !error && !sb_ioapic )
+    {
+        if ( amd_iommu_perdev_intremap )
+            error = -ENXIO;
+        printk("%sNo southbridge IO-APIC found in IVRS table\n",
+               amd_iommu_perdev_intremap ? XENLOG_ERR : XENLOG_WARNING);
+    }
+
     return error;
 }
 





_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
http://lists.xen.org/xen-devel

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
http://lists.xen.org/xen-devel

 


Rackspace

Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.