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[Qemu-devel] [PULL 4/4] hw/acpi/vmgenid: prevent more than one vmgenid d
From: |
Michael S. Tsirkin |
Subject: |
[Qemu-devel] [PULL 4/4] hw/acpi/vmgenid: prevent more than one vmgenid device |
Date: |
Wed, 22 Mar 2017 18:01:43 +0200 |
From: Laszlo Ersek <address@hidden>
A system with multiple VMGENID devices is undefined in the VMGENID spec by
omission.
Cc: "Michael S. Tsirkin" <address@hidden>
Cc: Ben Warren <address@hidden>
Cc: Igor Mammedov <address@hidden>
Cc: Paolo Bonzini <address@hidden>
Signed-off-by: Laszlo Ersek <address@hidden>
Reviewed-by: Michael S. Tsirkin <address@hidden>
Signed-off-by: Michael S. Tsirkin <address@hidden>
Binary file /tmp/tmp.IaAwzHwwsQ matches
---
include/hw/acpi/vmgenid.h | 1 +
hw/acpi/vmgenid.c | 8 ++++++++
2 files changed, 9 insertions(+)
diff --git a/include/hw/acpi/vmgenid.h b/include/hw/acpi/vmgenid.h
index 8578476..7beb959 100644
--- a/include/hw/acpi/vmgenid.h
+++ b/include/hw/acpi/vmgenid.h
@@ -24,6 +24,7 @@ typedef struct VmGenIdState {
bool write_pointer_available;
} VmGenIdState;
+/* returns NULL unless there is exactly one device */
static inline Object *find_vmgenid_dev(void)
{
return object_resolve_path_type("", VMGENID_DEVICE, NULL);
diff --git a/hw/acpi/vmgenid.c b/hw/acpi/vmgenid.c
index c3ddcc8..a32b847 100644
--- a/hw/acpi/vmgenid.c
+++ b/hw/acpi/vmgenid.c
@@ -221,6 +221,14 @@ static void vmgenid_realize(DeviceState *dev, Error **errp)
return;
}
+ /* Given that this function is executing, there is at least one VMGENID
+ * device. Check if there are several.
+ */
+ if (!find_vmgenid_dev()) {
+ error_setg(errp, "at most one %s device is permitted", VMGENID_DEVICE);
+ return;
+ }
+
qemu_register_reset(vmgenid_handle_reset, vms);
}
--
MST
- [Qemu-devel] [PULL 0/4] virtio, pc: fixes, Michael S. Tsirkin, 2017/03/22
- [Qemu-devel] [PULL 3/4] hw/acpi/vmgenid: prevent device realization on pre-2.5 machine types, Michael S. Tsirkin, 2017/03/22
- [Qemu-devel] [PULL 1/4] virtio: Fix error handling in virtio_bus_device_plugged, Michael S. Tsirkin, 2017/03/22
- [Qemu-devel] [PULL 2/4] virtio: always use handle_aio_output if registered, Michael S. Tsirkin, 2017/03/22
- [Qemu-devel] [PULL 4/4] hw/acpi/vmgenid: prevent more than one vmgenid device,
Michael S. Tsirkin <=
- Re: [Qemu-devel] [PULL 0/4] virtio, pc: fixes, Michael S. Tsirkin, 2017/03/22
- Re: [Qemu-devel] [PULL 0/4] virtio, pc: fixes, Peter Maydell, 2017/03/23