Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 4.7 080/186] random: add interrupt callback to VMBus IRQ handler | Date | Thu, 18 Aug 2016 15:58:17 +0200 |
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4.7-stable review patch. If anyone has any objections, please let me know.
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From: Stephan Mueller <smueller@chronox.de>
commit 4b44f2d18a330565227a7348844493c59366171e upstream.
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@atsec.com> Signed-off-by: Stephan Mueller <smueller@chronox.de> Signed-off-by: Theodore Ts'o <tytso@mit.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/char/random.c | 1 + drivers/hv/vmbus_drv.c | 3 +++ 2 files changed, 4 insertions(+)
--- a/drivers/char/random.c +++ b/drivers/char/random.c @@ -949,6 +949,7 @@ void add_interrupt_randomness(int irq, i /* 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) --- 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); }
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