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virtio-rng: support multiple virtio-rng devices

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Current hwrng core supports to register multiple hwrng devices,
and there is only one device really works in the same time.
QEMU alsu supports to have multiple virtio-rng backends.

This patch changes virtio-rng driver to support multiple
virtio-rng devices.

]# cat /sys/class/misc/hw_random/rng_available
virtio_rng.0 virtio_rng.1
]# cat /sys/class/misc/hw_random/rng_current
virtio_rng.0
]# echo -n virtio_rng.1 > /sys/class/misc/hw_random/rng_current
]# dd if=/dev/hwrng of=/dev/null

Signed-off-by: Amos Kong <akong@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Amos Kong
2014-05-14 10:33:46 +09:30
committed by Rusty Russell
parent e75279c4fb
commit 08e53fbdb8
2 changed files with 64 additions and 40 deletions
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2
include/linux/hw_random.h
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@@ -31,7 +31,7 @@
* @priv: Private data, for use by the RNG driver.
*/
struct hwrng {
const char *name;
char *name;
int (*init)(struct hwrng *rng);
void (*cleanup)(struct hwrng *rng);
int (*data_present)(struct hwrng *rng, int wait);