random: add interrupt callback to VMBus IRQ handler (4b44f2d1) · Commits · 戴 / test

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:

Stephan Mueller <stephan.mueller@atsec.com> Signed-off-by:

Stephan Mueller <smueller@chronox.de> Signed-off-by:

Theodore Ts'o <tytso@mit.edu>

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);
		}

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