virt: vmgenid: recognize new CID added by Hyper-V

In the Windows spec for VM Generation ID, the originally specified CID
is longer than allowed by the ACPI spec. Hyper-V has added "VMGENCTR" as
a second valid CID that is conformant, while retaining the original CID
for compatibility with Windows guests.

Add this new CID to the list recognized by the driver.

Signed-off-by: Michael Kelley <mikelley@microsoft.com>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

diff --git a/drivers/virt/vmgenid.c b/drivers/virt/vmgenid.c
index 0ae1a39..a1c467a 100644 (file)
--- a/drivers/virt/vmgenid.c
+++ b/drivers/virt/vmgenid.c
@@ -78,6 +78,7 @@ static void vmgenid_notify(struct acpi_device *device, u32 event)
 }
 
 static const struct acpi_device_id vmgenid_ids[] = {
+       { "VMGENCTR", 0 },
        { "VM_GEN_COUNTER", 0 },
        { }
 };