From: Otavio Pontes <otavio.pon...@intel.com>

Use the PCI mmconfig base address exported by jailhouse in boot
parameters in order to access the memory mapped PCI configuration space.

Signed-off-by: Otavio Pontes <otavio.pon...@intel.com>
[Jan: rebased, fixed !CONFIG_PCI_MMCONFIG, used pcibios_last_bus]
Signed-off-by: Jan Kiszka <jan.kis...@siemens.com>
Reviewed-by: Andy Shevchenko <andy.shevche...@gmail.com>
---
 arch/x86/include/asm/pci_x86.h | 2 ++
 arch/x86/kernel/jailhouse.c    | 8 ++++++++
 arch/x86/pci/mmconfig-shared.c | 4 ++--
 3 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/arch/x86/include/asm/pci_x86.h b/arch/x86/include/asm/pci_x86.h
index eb66fa9cd0fc..959d618dbb17 100644
--- a/arch/x86/include/asm/pci_x86.h
+++ b/arch/x86/include/asm/pci_x86.h
@@ -151,6 +151,8 @@ extern int pci_mmconfig_insert(struct device *dev, u16 seg, 
u8 start, u8 end,
                               phys_addr_t addr);
 extern int pci_mmconfig_delete(u16 seg, u8 start, u8 end);
 extern struct pci_mmcfg_region *pci_mmconfig_lookup(int segment, int bus);
+extern struct pci_mmcfg_region *__init pci_mmconfig_add(int segment, int start,
+                                                       int end, u64 addr);
 
 extern struct list_head pci_mmcfg_list;
 
diff --git a/arch/x86/kernel/jailhouse.c b/arch/x86/kernel/jailhouse.c
index b68fd895235a..fa183a131edc 100644
--- a/arch/x86/kernel/jailhouse.c
+++ b/arch/x86/kernel/jailhouse.c
@@ -124,6 +124,14 @@ static int __init jailhouse_pci_arch_init(void)
        if (pcibios_last_bus < 0)
                pcibios_last_bus = 0xff;
 
+#ifdef CONFIG_PCI_MMCONFIG
+       if (setup_data.pci_mmconfig_base) {
+               pci_mmconfig_add(0, 0, pcibios_last_bus,
+                                setup_data.pci_mmconfig_base);
+               pci_mmcfg_arch_init();
+       }
+#endif
+
        return 0;
 }
 
diff --git a/arch/x86/pci/mmconfig-shared.c b/arch/x86/pci/mmconfig-shared.c
index 96684d0adcf9..0e590272366b 100644
--- a/arch/x86/pci/mmconfig-shared.c
+++ b/arch/x86/pci/mmconfig-shared.c
@@ -94,8 +94,8 @@ static struct pci_mmcfg_region *pci_mmconfig_alloc(int 
segment, int start,
        return new;
 }
 
-static struct pci_mmcfg_region *__init pci_mmconfig_add(int segment, int start,
-                                                       int end, u64 addr)
+struct pci_mmcfg_region *__init pci_mmconfig_add(int segment, int start,
+                                                int end, u64 addr)
 {
        struct pci_mmcfg_region *new;
 
-- 
2.13.6

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