From 636228a887c4d5c0dc313bbf936de969b420a91a Mon Sep 17 00:00:00 2001
From: "Michael S. Tsirkin" <mst@redhat.com>
Date: Sun, 1 Sep 2013 13:26:03 +0300
Subject: q35: make pci window address/size match guest cfg

For Q35, MMCFG address and size are guest configurable.
Update w32 property to make it behave accordingly.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
 hw/pci-host/q35.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'hw')

diff --git a/hw/pci-host/q35.c b/hw/pci-host/q35.c
index 54735043b7..72f6b7213b 100644
--- a/hw/pci-host/q35.c
+++ b/hw/pci-host/q35.c
@@ -214,6 +214,16 @@ static void mch_update_pciexbar(MCHPCIState *mch)
     }
     addr = pciexbar & addr_mask;
     pcie_host_mmcfg_update(pehb, enable, addr, length);
+    /* Leave enough space for the MCFG BAR */
+    /*
+     * TODO: this matches current bios behaviour, but it's not a power of two,
+     * which means an MTRR can't cover it exactly.
+     */
+    if (enable) {
+        mch->pci_info.w32.begin = addr + length;
+    } else {
+        mch->pci_info.w32.begin = MCH_HOST_BRIDGE_PCIEXBAR_DEFAULT;
+    }
 }
 
 /* PAM */
-- 
cgit v1.2.3