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

[Daniel De Graaf <dgdegra@xxxxxxxxxxxxx>]

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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