From ad6bcdad2b6724e113f191a12f859a9e8456b26d Mon Sep 17 00:00:00 2001 From: Babis Chalios Date: Wed, 31 May 2023 11:51:19 +0200 Subject: 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 Reviewed-by: Alexander Graf Reviewed-by: Lennart Poettering Link: https://lore.kernel.org/r/20230531095119.11202-2-bchalios@amazon.es Signed-off-by: Greg Kroah-Hartman --- drivers/virt/vmgenid.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'drivers/virt') 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 @@ 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[] = { -- cgit