[PATCH 3/4] random: add interrupt callback to VMBus IRQ handler
From: Theodore Ts'o <tytso@mit.edu>
Date: 2016-05-04 19:26:39
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
From: Stephan Mueller <redacted> 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> Signed-off-by: Stephan Mueller <redacted> Signed-off-by: Theodore Ts'o <tytso@mit.edu> --- 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 b970db6..897c75e 100644
--- a/drivers/char/random.c
+++ b/drivers/char/random.c@@ -1134,6 +1134,7 @@ 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 64713ff..9af61bb 100644
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c@@ -41,6 +41,7 @@ #include <linux/ptrace.h> #include <linux/screen_info.h> #include <linux/kdebug.h> +#include <linux/random.h> #include "hyperv_vmbus.h" static struct acpi_device *hv_acpi_dev;
@@ -801,6 +802,8 @@ static void vmbus_isr(void) else tasklet_schedule(hv_context.msg_dpc[cpu]); } + + add_interrupt_randomness(HYPERVISOR_CALLBACK_VECTOR, 0); }
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2.5.0