[Xen-devel] [PATCH 3/3] x86/AMD-Vi: Fix IVRS HPET special->handle override

[<suravee.suthikulpanit@xxxxxxx>]

From: Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx>

The current logic does not handle the case when HPET special->handle
is invalid in IVRS. On such system, the following message is shown:

(XEN) AMD-Vi: Failed to setup HPET MSI remapping: Wrong HPET

This patch will allow the ivrs_hpet[<handle>]=<sbdf> to override the
IVRS.

Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx>
---
 xen/drivers/passthrough/amd/iommu_acpi.c | 22 +++++++++++++++-------
 1 file changed, 15 insertions(+), 7 deletions(-)

diff --git a/xen/drivers/passthrough/amd/iommu_acpi.c 
b/xen/drivers/passthrough/amd/iommu_acpi.c
index 0778af0..bfcc2eb 100644
--- a/xen/drivers/passthrough/amd/iommu_acpi.c
+++ b/xen/drivers/passthrough/amd/iommu_acpi.c
@@ -671,6 +671,7 @@ static void __init parse_ivrs_hpet(char *str)
     if ( !s || *s )
         return;
 
+    hpet_sbdf.id = id;
     hpet_sbdf.bdf = PCI_BDF(bus, dev, func);
     hpet_sbdf.seg = seg;
     hpet_sbdf.cmdline = 1;
@@ -787,19 +788,26 @@ static u16 __init parse_ivhd_device_special(
         }
         break;
     case ACPI_IVHD_HPET:
+        if ( hpet_sbdf.cmdline )
+        {
+            AMD_IOMMU_DEBUG("IVHD: Command line override present for HPET %#x "
+                            "(IVRS: %#x devID %04x:%02x:%02x.%u)\n",
+                            hpet_sbdf.id, special->handle, seg, PCI_BUS(bdf),
+                            PCI_SLOT(bdf), PCI_FUNC(bdf));
+            hpet_sbdf.iommu = iommu;
+            break;
+        }
+
         /* set device id of hpet */
-        if ( hpet_sbdf.iommu ||
-             (hpet_sbdf.cmdline && hpet_sbdf.id != special->handle) )
+        if ( hpet_sbdf.iommu )
         {
             printk(XENLOG_WARNING "Only one IVHD HPET entry is supported\n");
             break;
         }
+
         hpet_sbdf.id = special->handle;
-        if ( !hpet_sbdf.cmdline )
-        {
-            hpet_sbdf.bdf = bdf;
-            hpet_sbdf.seg = seg;
-        }
+        hpet_sbdf.bdf = bdf;
+        hpet_sbdf.seg = seg;
         hpet_sbdf.iommu = iommu;
         break;
     default:
-- 
1.8.1.2



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