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Commit 4b44f2d1 authored by Stephan Mueller's avatar Stephan Mueller Committed by Theodore Ts'o
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random: add interrupt callback to VMBus IRQ handler 



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.

Cc: stable@kernel.org
Signed-off-by: default avatarStephan Mueller <stephan.mueller@atsec.com>
Signed-off-by: default avatarStephan Mueller <smueller@chronox.de>
Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
parent 9b4d0087

drivers/char/random.c

+1 −0
Original line number Diff line number Diff line
@@ -946,6 +946,7 @@ 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)

drivers/hv/vmbus_drv.c

+3 −0
Original line number Diff line number Diff line
@@ -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);

}