[PATCH] ns16550: enable memory decoding on MMIO-based PCI console card

[Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>]

pci_serial_early_init() enables PCI_COMMAND_IO for IO-based UART
devices, do similar with PCI_COMMAND_MEMORY for MMIO-based UART devices.

Signed-off-by: Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
---
This fixes the issue I was talking about on #xendevel. Thanks Roger for
the hint.
---
 xen/drivers/char/ns16550.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/xen/drivers/char/ns16550.c b/xen/drivers/char/ns16550.c
index 1b21eb93c45f..acfcce1c5d72 100644
--- a/xen/drivers/char/ns16550.c
+++ b/xen/drivers/char/ns16550.c
@@ -272,9 +272,17 @@ static int cf_check ns16550_getc(struct serial_port *port, 
char *pc)
 static void pci_serial_early_init(struct ns16550 *uart)
 {
 #ifdef NS16550_PCI
-    if ( !uart->ps_bdf_enable || uart->io_base >= 0x10000 )
+    if ( !uart->ps_bdf_enable )
         return;
 
+    if ( uart->io_base >= 0x10000 )
+    {
+        pci_conf_write16(PCI_SBDF(0, uart->ps_bdf[0], uart->ps_bdf[1],
+                                  uart->ps_bdf[2]),
+                         PCI_COMMAND, PCI_COMMAND_MEMORY);
+        return;
+    }
+
     if ( uart->pb_bdf_enable )
         pci_conf_write16(PCI_SBDF(0, uart->pb_bdf[0], uart->pb_bdf[1],
                                   uart->pb_bdf[2]),
-- 
2.39.2