Re: [Qemu-devel] [PATCH v6 00/26] qemu: generate acpi tables for the guest

["Michael S. Tsirkin" <mst@redhat.com>]

On Tue, Oct 01, 2013 at 12:03:57PM +0200, Igor Mammedov wrote:
> On Sun, 29 Sep 2013 13:58:21 +0300
> "Michael S. Tsirkin" <mst@redhat.com> wrote:
> 
> WS2008R2x64 BSODs with ACPI error on boot when 64bit PCI hole is present,
> but it boots fine with upstream QEMU [stock or acpi BIOS]
> 
> QEMU cli:
> 
> qemu-system-x86_64 -enable-kvm -monitor stdio -m 4096 test.qcow2  -device ivshmem,size=4G,chardev=cfoo -chardev socket,path=/tmp/sock,id=cfoo,server,nowait
> 

Thanks!
This fixes it for me (below).
I'll roll this in the next revision.

diff --git a/hw/pci/pci.c b/hw/pci/pci.c
index 7d5d103..d359685 100644
--- a/hw/pci/pci.c
+++ b/hw/pci/pci.c
@@ -2281,7 +2281,7 @@ static void pci_dev_get_w64(PCIBus *b, PCIDevice *dev, void *opaque)
     Range *range = opaque;
     PCIDeviceClass *pc = PCI_DEVICE_GET_CLASS(dev);
     uint16_t cmd = pci_get_word(dev->config + PCI_COMMAND);
-    int r;
+    int i;
 
     if (!(cmd & PCI_COMMAND_MEMORY)) {
         return;
@@ -2300,17 +2300,21 @@ static void pci_dev_get_w64(PCIBus *b, PCIDevice *dev, void *opaque)
             range_extend(range, &pref_range);
         }
     }
-    for (r = 0; r < PCI_NUM_REGIONS; ++r) {
-        PCIIORegion *region = &dev->io_regions[r];
+    for (i = 0; i < PCI_NUM_REGIONS; ++i) {
+        PCIIORegion *r = &dev->io_regions[i];
         Range region_range;
 
-        if (!region->size ||
-            (region->type & PCI_BASE_ADDRESS_SPACE_IO) ||
-            !(region->type & PCI_BASE_ADDRESS_MEM_TYPE_64)) {
+        if (!r->size ||
+            (r->type & PCI_BASE_ADDRESS_SPACE_IO) ||
+            !(r->type & PCI_BASE_ADDRESS_MEM_TYPE_64)) {
+            continue;
+        }
+        region_range.begin = pci_bar_address(dev, i, r->type, r->size);
+        region_range.end = region_range.begin + r->size;
+
+        if (region_range.begin == PCI_BAR_UNMAPPED) {
             continue;
         }
-        region_range.begin = pci_get_quad(dev->config + pci_bar(dev, r));
-        region_range.end = region_range.begin + region->size;
 
         region_range.begin = MAX(region_range.begin, 0x1ULL << 32);