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 <stephan.mueller@xxxxxxxxx> Signed-off-by: Stephan Mueller <smueller@xxxxxxxxxx> --- 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 92c2174..9632976 100644 --- a/drivers/char/random.c +++ b/drivers/char/random.c @@ -947,6 +947,7 @@ 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); } -- 2.5.5 -- To unsubscribe from this list: send the line "unsubscribe linux-crypto" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
