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authorDavid Gibson <david@gibson.dropbear.id.au>2015-02-10 15:36:16 +1100
committerAlexander Graf <agraf@suse.de>2015-03-09 15:00:03 +0100
commiteefaccc02bab659c8cb4c994b2f385c3f0a27551 (patch)
tree93412a0758b772c7a04d5e9571a983912f0c2228 /hw/ppc
parent3c2784fc864d943ff70a2a5c9dea8e9a9b4d9e1d (diff)
pseries: Switch VGA endian on H_SET_MODE
When the guest switches the interrupt endian mode, which essentially means a global machine endian switch, we want to change the VGA framebuffer endian mode as well in order to be backward compatible with existing guests who don't know about the new endian control register. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Reviewed-by: Michael Roth <mdroth@linux.vnet.ibm.com> Signed-off-by: Alexander Graf <agraf@suse.de>
Diffstat (limited to 'hw/ppc')
-rw-r--r--hw/ppc/spapr_hcall.c2
-rw-r--r--hw/ppc/spapr_pci.c28
2 files changed, 30 insertions, 0 deletions
diff --git a/hw/ppc/spapr_hcall.c b/hw/ppc/spapr_hcall.c
index 86514472fe..4f76f1cbfe 100644
--- a/hw/ppc/spapr_hcall.c
+++ b/hw/ppc/spapr_hcall.c
@@ -731,12 +731,14 @@ static target_ulong h_set_mode_resource_le(PowerPCCPU *cpu,
CPU_FOREACH(cs) {
set_spr(cs, SPR_LPCR, 0, LPCR_ILE);
}
+ spapr_pci_switch_vga(true);
return H_SUCCESS;
case H_SET_MODE_ENDIAN_LITTLE:
CPU_FOREACH(cs) {
set_spr(cs, SPR_LPCR, LPCR_ILE, LPCR_ILE);
}
+ spapr_pci_switch_vga(false);
return H_SUCCESS;
}
diff --git a/hw/ppc/spapr_pci.c b/hw/ppc/spapr_pci.c
index cebdeb3516..7d37d83b27 100644
--- a/hw/ppc/spapr_pci.c
+++ b/hw/ppc/spapr_pci.c
@@ -982,3 +982,31 @@ static void spapr_pci_register_types(void)
}
type_init(spapr_pci_register_types)
+
+static int spapr_switch_one_vga(DeviceState *dev, void *opaque)
+{
+ bool be = *(bool *)opaque;
+
+ if (object_dynamic_cast(OBJECT(dev), "VGA")
+ || object_dynamic_cast(OBJECT(dev), "secondary-vga")) {
+ object_property_set_bool(OBJECT(dev), be, "big-endian-framebuffer",
+ &error_abort);
+ }
+ return 0;
+}
+
+void spapr_pci_switch_vga(bool big_endian)
+{
+ sPAPRPHBState *sphb;
+
+ /*
+ * For backward compatibility with existing guests, we switch
+ * the endianness of the VGA controller when changing the guest
+ * interrupt mode
+ */
+ QLIST_FOREACH(sphb, &spapr->phbs, list) {
+ BusState *bus = &PCI_HOST_BRIDGE(sphb)->bus->qbus;
+ qbus_walk_children(bus, spapr_switch_one_vga, NULL, NULL, NULL,
+ &big_endian);
+ }
+}