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authorIgor Mammedov <imammedo@redhat.com>2015-09-29 16:53:29 +0200
committerMichael S. Tsirkin <mst@redhat.com>2015-10-02 17:04:32 +0300
commitaa8580cddf011e8cedcf87f7a0fdea7549fc4704 (patch)
tree1969af2815090d7c10ac02daead7bb50a7a9f0a8 /hw
parentdf0acded19ec4b826aa095cfc19d341bd66fafd3 (diff)
pc: memhp: force gaps between DIMM's GPA
mapping DIMMs non contiguously allows to workaround virtio bug reported earlier: http://lists.nongnu.org/archive/html/qemu-devel/2015-08/msg00522.html in this case guest kernel doesn't allocate buffers that can cross DIMM boundary keeping each buffer local to a DIMM. Suggested-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Igor Mammedov <imammedo@redhat.com> Acked-by: Eduardo Habkost <ehabkost@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'hw')
-rw-r--r--hw/i386/pc.c6
-rw-r--r--hw/i386/pc_piix.c1
-rw-r--r--hw/i386/pc_q35.c1
3 files changed, 6 insertions, 2 deletions
diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index ef027364ce..efbd41a1f1 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -1629,6 +1629,7 @@ static void pc_dimm_plug(HotplugHandler *hotplug_dev,
HotplugHandlerClass *hhc;
Error *local_err = NULL;
PCMachineState *pcms = PC_MACHINE(hotplug_dev);
+ PCMachineClass *pcmc = PC_MACHINE_GET_CLASS(pcms);
PCDIMMDevice *dimm = PC_DIMM(dev);
PCDIMMDeviceClass *ddc = PC_DIMM_GET_CLASS(dimm);
MemoryRegion *mr = ddc->get_memory_region(dimm);
@@ -1644,8 +1645,8 @@ static void pc_dimm_plug(HotplugHandler *hotplug_dev,
goto out;
}
- pc_dimm_memory_plug(dev, &pcms->hotplug_memory, mr, align, false,
- &local_err);
+ pc_dimm_memory_plug(dev, &pcms->hotplug_memory, mr, align,
+ pcmc->inter_dimm_gap, &local_err);
if (local_err) {
goto out;
}
@@ -1946,6 +1947,7 @@ static void pc_machine_class_init(ObjectClass *oc, void *data)
PCMachineClass *pcmc = PC_MACHINE_CLASS(oc);
HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(oc);
+ pcmc->inter_dimm_gap = true;
pcmc->get_hotplug_handler = mc->get_hotplug_handler;
mc->get_hotplug_handler = pc_get_hotpug_handler;
mc->cpu_index_to_socket_id = pc_cpu_index_to_socket_id;
diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
index 52fdd558e8..4514cd1462 100644
--- a/hw/i386/pc_piix.c
+++ b/hw/i386/pc_piix.c
@@ -489,6 +489,7 @@ static void pc_i440fx_2_4_machine_options(MachineClass *m)
m->alias = NULL;
m->is_default = 0;
pcmc->broken_reserved_end = true;
+ pcmc->inter_dimm_gap = false;
SET_MACHINE_COMPAT(m, PC_COMPAT_2_4);
}
diff --git a/hw/i386/pc_q35.c b/hw/i386/pc_q35.c
index 837e430666..1f100b1a69 100644
--- a/hw/i386/pc_q35.c
+++ b/hw/i386/pc_q35.c
@@ -392,6 +392,7 @@ static void pc_q35_2_4_machine_options(MachineClass *m)
pc_q35_2_5_machine_options(m);
m->alias = NULL;
pcmc->broken_reserved_end = true;
+ pcmc->inter_dimm_gap = false;
SET_MACHINE_COMPAT(m, PC_COMPAT_2_4);
}