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[Xen-devel] [PATCH] x86/PCI: pass correct register value to XSM



When using AMD's extension to access the extended PCI config space, only
the low byte of the register number was being passed to XSM. Include the
full value.

Signed-off-by: Daniel De Graaf <dgdegra@xxxxxxxxxxxxx>
---
 xen/arch/x86/traps.c |    1 +
 1 file changed, 1 insertion(+)

diff --git a/xen/arch/x86/traps.c b/xen/arch/x86/traps.c
index 2264583..38ad9e7 100644
--- a/xen/arch/x86/traps.c
+++ b/xen/arch/x86/traps.c
@@ -1691,6 +1691,7 @@ static int pci_cfg_ok(struct domain *d, int write, int 
size)
 
     machine_bdf = (d->arch.pci_cf8 >> 8) & 0xFFFF;
     start = d->arch.pci_cf8 & 0xFF;
+    start |= (d->arch.pci_cf8 >> 16) & 0xF00;
     end = start + size - 1;
     if (xsm_pci_config_permission(d, machine_bdf, start, end, write))
         return 0;
-- 
1.7.10.2


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