Messages in this thread Patch in this message | | | From | Babis Chalios <> | Subject | [PATCH 1/1] vmgenid: emit uevent when VMGENID updates | Date | Wed, 31 May 2023 11:51:19 +0200 |
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We receive an ACPI notification every time the VM Generation ID changes and use the new ID as fresh randomness added to the entropy pool. This commits emits a uevent every time we receive the ACPI notification, as a means to notify the user space that it now is in a new VM.
Signed-off-by: Babis Chalios <bchalios@amazon.es> --- drivers/virt/vmgenid.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/drivers/virt/vmgenid.c b/drivers/virt/vmgenid.c index a1c467a0e9f7..b67a28da4702 100644 --- a/drivers/virt/vmgenid.c +++ b/drivers/virt/vmgenid.c @@ -68,6 +68,7 @@ static int vmgenid_add(struct acpi_device *device) static void vmgenid_notify(struct acpi_device *device, u32 event) { struct vmgenid_state *state = acpi_driver_data(device); + char *envp[] = { "NEW_VMGENID=1", NULL }; u8 old_id[VMGENID_SIZE]; memcpy(old_id, state->this_id, sizeof(old_id)); @@ -75,6 +76,7 @@ static void vmgenid_notify(struct acpi_device *device, u32 event) if (!memcmp(old_id, state->this_id, sizeof(old_id))) return; add_vmfork_randomness(state->this_id, sizeof(state->this_id)); + kobject_uevent_env(&device->dev.kobj, KOBJ_CHANGE, envp); } static const struct acpi_device_id vmgenid_ids[] = { -- 2.39.2
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