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authorBabis Chalios <bchalios@amazon.es>2023-05-31 12:51:19 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2023-11-30 13:52:00 +0300
commitad6bcdad2b6724e113f191a12f859a9e8456b26d (patch)
treead0a0b9d081046fd3960c769a30947715a8044aa /drivers/virt/vmgenid.c
parentb9873755a6c8ccfce79094c4dce9efa3ecb1a749 (diff)
downloadlinux-ad6bcdad2b6724e113f191a12f859a9e8456b26d.tar.xz
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>
Diffstat (limited to 'drivers/virt/vmgenid.c')
-rw-r--r--drivers/virt/vmgenid.c2
1 files changed, 2 insertions, 0 deletions
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[] = {