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Subject[PATCH V4 06/23] XEN / PCI: Remove the dependence on arch x86 when PCI_MMCONFIG=y
In drivers/xen/pci.c, there are arch x86 dependent codes when
depends on ACPI, so this will prevent XEN PCI running on other
architectures using ACPI with PCI_MMCONFIG enabled (such as ARM64).

Fortunatly, it can be sloved in a simple way. In drivers/xen/pci.c,
the only x86 dependent code is if ((pci_probe & PCI_PROBE_MMCONF) == 0),
and it's defined in asm/pci_x86.h, the code means that
if the PCI resource is not probed in PCI_PROBE_MMCONF way, just
ingnore the xen mcfg init. Actually this is duplicate, because
if PCI resource is not probed in PCI_PROBE_MMCONF way, the
pci_mmconfig_list will be empty, and the if (list_empty())
after it will do the same job.

So just remove the arch related code and the head file, this
will be no functional change for x86, and also makes xen/pci.c
usable for other architectures.

Signed-off-by: Hanjun Guo <>
CC: Konrad Rzeszutek Wilk <>
CC: Boris Ostrovsky <>
Cc: Stefano Stabellini <>
Tested-by: Suravee Suthikulpanit <>
Tested-by: Jeremy Linton <>
Tested-by: Duc Dang <>
Tested-by: Dongdong Liu <>
Tested-by: Hanjun Guo <>
Tested-by: Graeme Gregory <>
Tested-by: Sinan Kaya <>
Reviewed-by: Boris Ostrovsky <>
Acked-by: Stefano Stabellini <>
drivers/xen/pci.c | 6 ------
1 file changed, 6 deletions(-)

diff --git a/drivers/xen/pci.c b/drivers/xen/pci.c
index 6785ebb..9a8dbe3 100644
--- a/drivers/xen/pci.c
+++ b/drivers/xen/pci.c
@@ -28,9 +28,6 @@
#include <asm/xen/hypervisor.h>
#include <asm/xen/hypercall.h>
#include "../pci/pci.h"
-#include <asm/pci_x86.h>

static bool __read_mostly pci_seg_supported = true;

@@ -222,9 +219,6 @@ static int __init xen_mcfg_late(void)
if (!xen_initial_domain())
return 0;

- if ((pci_probe & PCI_PROBE_MMCONF) == 0)
- return 0;
if (list_empty(&pci_mmcfg_list))
return 0;

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