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authorMarc-André Lureau <marcandre.lureau@redhat.com>2017-08-07 18:45:13 +0200
committerMichael S. Tsirkin <mst@redhat.com>2017-09-08 16:15:17 +0300
commitc8389550dedc65892fba9c3df29423efd802f544 (patch)
treed12800e551f692de580758a48d4709239acaa994 /hw
parent672339f7eff5e9226f302037290e84e783d2b5cd (diff)
vmgenid: replace x-write-pointer-available hack
This compat property sole function is to prevent the device from being instantiated. Instead of requiring an extra compat property, check if fw_cfg has DMA enabled. fw_cfg is a built-in device that is initialized very early by the machine init code. We have at least one other device that also assumes fw_cfg_find() can be safely used on realize: pvpanic. This has the additional benefit of handling other cases properly, like: $ qemu-system-x86_64 -device vmgenid -machine none qemu-system-x86_64: -device vmgenid: vmgenid requires DMA write support in fw_cfg, which this machine type does not provide $ qemu-system-x86_64 -device vmgenid -machine pc-i440fx-2.9 -global fw_cfg.dma_enabled=off qemu-system-x86_64: -device vmgenid: vmgenid requires DMA write support in fw_cfg, which this machine type does not provide $ qemu-system-x86_64 -device vmgenid -machine pc-i440fx-2.6 -global fw_cfg.dma_enabled=on [boots normally] Suggested-by: Eduardo Habkost <ehabkost@redhat.com> Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Eduardo Habkost <ehabkost@redhat.com> Reviewed-by: Ben Warren <ben@skyportsystems.com> Reviewed-by: Laszlo Ersek <lersek@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/acpi/bios-linker-loader.c10
-rw-r--r--hw/acpi/vmgenid.c9
2 files changed, 11 insertions, 8 deletions
diff --git a/hw/acpi/bios-linker-loader.c b/hw/acpi/bios-linker-loader.c
index 046183a0f1..d16b8bbcb1 100644
--- a/hw/acpi/bios-linker-loader.c
+++ b/hw/acpi/bios-linker-loader.c
@@ -169,6 +169,16 @@ bios_linker_find_file(const BIOSLinker *linker, const char *name)
}
/*
+ * board code must realize fw_cfg first, as a fixed device, before
+ * another device realize function call bios_linker_loader_can_write_pointer()
+ */
+bool bios_linker_loader_can_write_pointer(void)
+{
+ FWCfgState *fw_cfg = fw_cfg_find();
+ return fw_cfg && fw_cfg_dma_enabled(fw_cfg);
+}
+
+/*
* bios_linker_loader_alloc: ask guest to load file into guest memory.
*
* @linker: linker object instance
diff --git a/hw/acpi/vmgenid.c b/hw/acpi/vmgenid.c
index 876723a4ce..2876d8a639 100644
--- a/hw/acpi/vmgenid.c
+++ b/hw/acpi/vmgenid.c
@@ -205,17 +205,11 @@ static void vmgenid_handle_reset(void *opaque)
memset(vms->vmgenid_addr_le, 0, ARRAY_SIZE(vms->vmgenid_addr_le));
}
-static Property vmgenid_properties[] = {
- DEFINE_PROP_BOOL("x-write-pointer-available", VmGenIdState,
- write_pointer_available, true),
- DEFINE_PROP_END_OF_LIST(),
-};
-
static void vmgenid_realize(DeviceState *dev, Error **errp)
{
VmGenIdState *vms = VMGENID(dev);
- if (!vms->write_pointer_available) {
+ if (!bios_linker_loader_can_write_pointer()) {
error_setg(errp, "%s requires DMA write support in fw_cfg, "
"which this machine type does not provide", VMGENID_DEVICE);
return;
@@ -239,7 +233,6 @@ static void vmgenid_device_class_init(ObjectClass *klass, void *data)
dc->vmsd = &vmstate_vmgenid;
dc->realize = vmgenid_realize;
dc->hotpluggable = false;
- dc->props = vmgenid_properties;
set_bit(DEVICE_CATEGORY_MISC, dc->categories);
object_class_property_add_str(klass, VMGENID_GUID, NULL,