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Subject[PATCH 3/6] x86/jailhouse: Enable PCI mmconfig access in inmates
Date
From: Otavio Pontes <otavio.pontes@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.pontes@intel.com>
[Jan: rebased, fixed !CONFIG_PCI_MMCONFIG]
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
---
arch/x86/include/asm/pci_x86.h | 2 ++
arch/x86/kernel/jailhouse.c | 7 +++++++
arch/x86/pci/mmconfig-shared.c | 4 ++--
3 files changed, 11 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..7fe2a73da0b3 100644
--- a/arch/x86/kernel/jailhouse.c
+++ b/arch/x86/kernel/jailhouse.c
@@ -124,6 +124,13 @@ 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, 0xff, 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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