[PATCH v4 5/5] random: add interrupt callback to VMBus IRQ handler
From: Stephan Mueller <hidden>
Date: 2016-05-31 18:42:42
Also in:
lkml
Subsystem:
hyper-v/azure core and drivers, random number driver, the rest · Maintainers:
"K. Y. Srinivasan", Haiyang Zhang, Wei Liu, Dexuan Cui, Long Li, "Theodore Ts'o", Jason A. Donenfeld, Linus Torvalds
The Hyper-V Linux Integration Services use the VMBus implementation for communication with the Hypervisor. VMBus registers its own interrupt handler that completely bypasses the common Linux interrupt handling. This implies that the interrupt entropy collector is not triggered. This patch adds the interrupt entropy collection callback into the VMBus interrupt handler function. Signed-off-by: Stephan Mueller <redacted> --- drivers/char/random.c | 1 + drivers/hv/vmbus_drv.c | 3 +++ 2 files changed, 4 insertions(+)
diff --git a/drivers/char/random.c b/drivers/char/random.c
index ef89c0e..ac74716 100644
--- a/drivers/char/random.c
+++ b/drivers/char/random.c@@ -948,6 +948,7 @@ void add_interrupt_randomness(int irq, int irq_flags) /* award one bit for the contents of the fast pool */ credit_entropy_bits(r, credit + 1); } +EXPORT_SYMBOL_GPL(add_interrupt_randomness); #ifdef CONFIG_BLOCK void add_disk_randomness(struct gendisk *disk)
diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
index 952f20f..e82f7e1 100644
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c@@ -42,6 +42,7 @@ #include <linux/screen_info.h> #include <linux/kdebug.h> #include <linux/efi.h> +#include <linux/random.h> #include "hyperv_vmbus.h" static struct acpi_device *hv_acpi_dev;
@@ -806,6 +807,8 @@ static void vmbus_isr(void) else tasklet_schedule(hv_context.msg_dpc[cpu]); } + + add_interrupt_randomness(HYPERVISOR_CALLBACK_VECTOR, 0); }
--
2.7.2