[PATCH 1/1] virt: vmgenid: Recognize new CID added by Hyper-V

[PATCH 1/1] virt: vmgenid: Recognize new CID added by Hyper-V

[Michael Kelley]

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>
---
 drivers/virt/vmgenid.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/virt/vmgenid.c b/drivers/virt/vmgenid.c
index 0ae1a39..a1c467a 100644
--- 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 },
 	{ }
 };
-- 
1.8.3.1

Re: [PATCH 1/1] virt: vmgenid: Recognize new CID added by Hyper-V

[Jason A. Donenfeld]

Hi Michael,

On Thu, Mar 24, 2022 at 1:20 PM Michael Kelley <mikelley@microsoft.com> wrote:
>
> 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.

Thanks for the patch. Applied to crng/random.git.

Jason