621a20e081
This patch triggers timer only when guest requests for entropy. As soon as first request from guest for entropy comes we set the timer. Timer bumps up the quota value when it gets triggered. Signed-off-by: Pankaj Gupta <pagupta@redhat.com> Reviewed-by: Amit Shah <amit.shah@redhat.com> Message-Id: <1436962608-9961-2-git-send-email-pagupta@redhat.com> [Re-worded patch subject, removed extra whitespace -- Amit] Signed-off-by: Amit Shah <amit.shah@redhat.com>
51 lines
1.2 KiB
C
51 lines
1.2 KiB
C
/*
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* Virtio RNG Support
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*
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* Copyright Red Hat, Inc. 2012
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* Copyright Amit Shah <amit.shah@redhat.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or
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* (at your option) any later version. See the COPYING file in the
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* top-level directory.
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*/
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#ifndef _QEMU_VIRTIO_RNG_H
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#define _QEMU_VIRTIO_RNG_H
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#include "sysemu/rng.h"
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#include "sysemu/rng-random.h"
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#include "standard-headers/linux/virtio_rng.h"
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#define TYPE_VIRTIO_RNG "virtio-rng-device"
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#define VIRTIO_RNG(obj) \
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OBJECT_CHECK(VirtIORNG, (obj), TYPE_VIRTIO_RNG)
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#define VIRTIO_RNG_GET_PARENT_CLASS(obj) \
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OBJECT_GET_PARENT_CLASS(obj, TYPE_VIRTIO_RNG)
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struct VirtIORNGConf {
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RngBackend *rng;
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uint64_t max_bytes;
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uint32_t period_ms;
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RndRandom *default_backend;
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};
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typedef struct VirtIORNG {
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VirtIODevice parent_obj;
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/* Only one vq - guest puts buffer(s) on it when it needs entropy */
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VirtQueue *vq;
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VirtIORNGConf conf;
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RngBackend *rng;
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/* We purposefully don't migrate this state. The quota will reset on the
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* destination as a result. Rate limiting is host state, not guest state.
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*/
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QEMUTimer *rate_limit_timer;
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int64_t quota_remaining;
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bool activate_timer;
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} VirtIORNG;
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#endif
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