Messages in this thread Patch in this message | | | From | "Jason A. Donenfeld" <> | Subject | [PATCH] PM: notify of PM_POST_VMFORK events from vmgenid | Date | Tue, 1 Mar 2022 18:31:20 +0100 |
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There's an additional virtual power state that various crypto-oriented drivers may benefit from being notified of, such as WireGuard: right after a virtual machine has forked. In WireGuard's case, the PM notifier there that clears keys pre-suspend will be adjusted to also clear them post-vmfork. This trivial commit wires up the machinery for that change, which builds on the recently added vmgenid driver in the random.git tree.
Cc: Rafael J. Wysocki <rafael@kernel.org> Cc: Pavel Machek <pavel@ucw.cz> Cc: Len Brown <len.brown@intel.com> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> --- drivers/virt/vmgenid.c | 2 ++ include/linux/suspend.h | 4 ++++ kernel/power/main.c | 6 ++++++ 3 files changed, 12 insertions(+)
diff --git a/drivers/virt/vmgenid.c b/drivers/virt/vmgenid.c index 0ae1a39f2e28..4bef3e8b3476 100644 --- a/drivers/virt/vmgenid.c +++ b/drivers/virt/vmgenid.c @@ -10,6 +10,7 @@ #include <linux/kernel.h> #include <linux/module.h> #include <linux/acpi.h> +#include <linux/suspend.h> #include <linux/random.h> ACPI_MODULE_NAME("vmgenid"); @@ -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)); + pm_notify_vmfork(); } static const struct acpi_device_id vmgenid_ids[] = { diff --git a/include/linux/suspend.h b/include/linux/suspend.h index 300273ff40cc..a3836473b87b 100644 --- a/include/linux/suspend.h +++ b/include/linux/suspend.h @@ -477,6 +477,7 @@ static inline int is_hibernate_resume_dev(dev_t dev) { return 0; } #define PM_POST_SUSPEND 0x0004 /* Suspend finished */ #define PM_RESTORE_PREPARE 0x0005 /* Going to restore a saved image */ #define PM_POST_RESTORE 0x0006 /* Restore failed */ +#define PM_POST_VMFORK 0x0007 /* Virtual machine has just forked */ extern struct mutex system_transition_mutex; @@ -487,6 +488,7 @@ void restore_processor_state(void); /* kernel/power/main.c */ extern int register_pm_notifier(struct notifier_block *nb); extern int unregister_pm_notifier(struct notifier_block *nb); +extern void pm_notify_vmfork(void); extern void ksys_sync_helper(void); #define pm_notifier(fn, pri) { \ @@ -525,6 +527,8 @@ static inline int unregister_pm_notifier(struct notifier_block *nb) return 0; } +static inline void pm_notify_vmfork(void) {} + static inline void ksys_sync_helper(void) {} #define pm_notifier(fn, pri) do { (void)(fn); } while (0) diff --git a/kernel/power/main.c b/kernel/power/main.c index 7e646079fbeb..a64cfb36b1b3 100644 --- a/kernel/power/main.c +++ b/kernel/power/main.c @@ -94,6 +94,12 @@ int pm_notifier_call_chain(unsigned long val) return blocking_notifier_call_chain(&pm_chain_head, val, NULL); } +void pm_notify_vmfork(void) +{ + pm_notifier_call_chain(PM_POST_VMFORK); +} +EXPORT_SYMBOL_GPL(pm_notify_vmfork); + /* If set, devices may be suspended and resumed asynchronously. */ int pm_async_enabled = 1; -- 2.35.1
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