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vmgenid: emit uevent when VMGENID updates 

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>
Reviewed-by: Alexander Graf <graf@amazon.com>
Reviewed-by: Lennart Poettering <mzxreary@0pointer.de>
Link: https://lore.kernel.org/r/20230531095119.11202-2-bchalios@amazon.es
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Babis Chalios 2023-05-31 11:51:19 +02:00 committed by Greg Kroah-Hartman
parent b9873755a6
commit ad6bcdad2b
1 changed files with 2 additions and 0 deletions
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2
drivers/virt/vmgenid.c
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@ -68,6 +68,7 @@ out:
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[] = {