[PATCH] x86/mmcfg/drhd: Move acpi_mmcfg_init() before calling acpi_parse_dmar()

From: Zhenzhong Duan <zhenzhong.duan@oracle.com>
To: Xen-Devel <xen-devel@lists.xen.org>
Cc: david.westwood@hpe.com,
	Andrew Cooper3 <andrew.cooper3@citrix.com>,
	manoj.gopalasetty@hpe.com, JBeulich <JBeulich@suse.com>,
	Srinivas REDDY Eeda <srinivas.eeda@oracle.com>
Subject: [PATCH] x86/mmcfg/drhd: Move acpi_mmcfg_init() before calling acpi_parse_dmar()
Date: Wed, 15 Aug 2018 22:10:11 -0700 (PDT)	[thread overview]
Message-ID: <5fd7cd01-d55b-4fba-b57b-41560dc99cf2@default> (raw)

On a multiple pci segment system such as HPE Superdome-Flex, pci config space
from nonzero segment is accessed with mmcfg during acpi parsing DMAR region.

We need to setup mmcfg mapping before that or else drhd isn't correctly setup
and devices under it fail to load in dom0.

Signed-off-by: Zhenzhong Duan <zhenzhong.duan@oracle.com>
Tested-by: Gopalasetty, Manoj <manoj.gopalasetty@hpe.com>
---
 xen/arch/x86/setup.c |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/xen/arch/x86/setup.c b/xen/arch/x86/setup.c
index 8301de8..9af7426 100644
--- a/xen/arch/x86/setup.c
+++ b/xen/arch/x86/setup.c
@@ -1493,6 +1493,10 @@ void __init noreturn __start_xen(unsigned long mbi_p)
 
     generic_apic_probe();
 
+    pt_pci_init();
+
+    acpi_mmcfg_init();
+
     acpi_boot_init();
 
     if ( smp_found_config )
@@ -1596,12 +1600,8 @@ void __init noreturn __start_xen(unsigned long mbi_p)
 
     local_irq_enable();
 
-    pt_pci_init();
-
     vesa_mtrr_init();
 
-    acpi_mmcfg_init();
-
     early_msi_init();
 
     iommu_setup();    /* setup iommu if available */
-- 
1.7.3

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