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/*
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* Virtio Support
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*
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* Copyright IBM, Corp. 2007
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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*/
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#include <inttypes.h> |
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#include "trace.h" |
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#include "qemu-error.h" |
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#include "virtio.h" |
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/* The alignment to use between consumer and producer parts of vring.
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* x86 pagesize again. */
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#define VIRTIO_PCI_VRING_ALIGN 4096 |
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/* QEMU doesn't strictly need write barriers since everything runs in
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* lock-step. We'll leave the calls to wmb() in though to make it obvious for
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* KVM or if kqemu gets SMP support.
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* In any case, we must prevent the compiler from reordering the code.
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* TODO: we likely need some rmb()/mb() as well.
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*/
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#define wmb() __asm__ __volatile__("": : :"memory") |
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typedef struct VRingDesc |
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{ |
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uint64_t addr; |
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uint32_t len; |
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uint16_t flags; |
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uint16_t next; |
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} VRingDesc; |
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typedef struct VRingAvail |
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{ |
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uint16_t flags; |
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uint16_t idx; |
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uint16_t ring[0];
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} VRingAvail; |
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typedef struct VRingUsedElem |
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{ |
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uint32_t id; |
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uint32_t len; |
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} VRingUsedElem; |
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typedef struct VRingUsed |
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{ |
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uint16_t flags; |
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uint16_t idx; |
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VRingUsedElem ring[0];
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} VRingUsed; |
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typedef struct VRing |
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{ |
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unsigned int num; |
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target_phys_addr_t desc; |
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target_phys_addr_t avail; |
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target_phys_addr_t used; |
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} VRing; |
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struct VirtQueue
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{ |
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VRing vring; |
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target_phys_addr_t pa; |
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uint16_t last_avail_idx; |
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/* Last used index value we have signalled on */
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uint16_t signalled_used; |
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/* Last used index value we have signalled on */
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bool signalled_used_valid;
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/* Notification enabled? */
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bool notification;
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int inuse;
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uint16_t vector; |
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void (*handle_output)(VirtIODevice *vdev, VirtQueue *vq);
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VirtIODevice *vdev; |
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EventNotifier guest_notifier; |
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EventNotifier host_notifier; |
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}; |
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/* virt queue functions */
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static void virtqueue_init(VirtQueue *vq) |
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{ |
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target_phys_addr_t pa = vq->pa; |
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vq->vring.desc = pa; |
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vq->vring.avail = pa + vq->vring.num * sizeof(VRingDesc);
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vq->vring.used = vring_align(vq->vring.avail + |
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offsetof(VRingAvail, ring[vq->vring.num]), |
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VIRTIO_PCI_VRING_ALIGN); |
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} |
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static inline uint64_t vring_desc_addr(target_phys_addr_t desc_pa, int i) |
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{ |
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target_phys_addr_t pa; |
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pa = desc_pa + sizeof(VRingDesc) * i + offsetof(VRingDesc, addr);
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return ldq_phys(pa);
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} |
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static inline uint32_t vring_desc_len(target_phys_addr_t desc_pa, int i) |
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{ |
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target_phys_addr_t pa; |
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pa = desc_pa + sizeof(VRingDesc) * i + offsetof(VRingDesc, len);
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return ldl_phys(pa);
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} |
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static inline uint16_t vring_desc_flags(target_phys_addr_t desc_pa, int i) |
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{ |
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target_phys_addr_t pa; |
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pa = desc_pa + sizeof(VRingDesc) * i + offsetof(VRingDesc, flags);
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return lduw_phys(pa);
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} |
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static inline uint16_t vring_desc_next(target_phys_addr_t desc_pa, int i) |
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{ |
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target_phys_addr_t pa; |
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pa = desc_pa + sizeof(VRingDesc) * i + offsetof(VRingDesc, next);
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return lduw_phys(pa);
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} |
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static inline uint16_t vring_avail_flags(VirtQueue *vq) |
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{ |
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target_phys_addr_t pa; |
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pa = vq->vring.avail + offsetof(VRingAvail, flags); |
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return lduw_phys(pa);
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} |
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static inline uint16_t vring_avail_idx(VirtQueue *vq) |
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{ |
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target_phys_addr_t pa; |
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pa = vq->vring.avail + offsetof(VRingAvail, idx); |
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return lduw_phys(pa);
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} |
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static inline uint16_t vring_avail_ring(VirtQueue *vq, int i) |
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{ |
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target_phys_addr_t pa; |
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pa = vq->vring.avail + offsetof(VRingAvail, ring[i]); |
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return lduw_phys(pa);
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} |
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static inline uint16_t vring_used_event(VirtQueue *vq) |
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{ |
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return vring_avail_ring(vq, vq->vring.num);
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} |
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static inline void vring_used_ring_id(VirtQueue *vq, int i, uint32_t val) |
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{ |
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target_phys_addr_t pa; |
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pa = vq->vring.used + offsetof(VRingUsed, ring[i].id); |
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stl_phys(pa, val); |
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} |
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static inline void vring_used_ring_len(VirtQueue *vq, int i, uint32_t val) |
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{ |
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target_phys_addr_t pa; |
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pa = vq->vring.used + offsetof(VRingUsed, ring[i].len); |
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stl_phys(pa, val); |
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} |
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static uint16_t vring_used_idx(VirtQueue *vq)
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{ |
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target_phys_addr_t pa; |
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pa = vq->vring.used + offsetof(VRingUsed, idx); |
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return lduw_phys(pa);
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} |
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static inline void vring_used_idx_set(VirtQueue *vq, uint16_t val) |
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{ |
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target_phys_addr_t pa; |
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pa = vq->vring.used + offsetof(VRingUsed, idx); |
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stw_phys(pa, val); |
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} |
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static inline void vring_used_flags_set_bit(VirtQueue *vq, int mask) |
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{ |
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target_phys_addr_t pa; |
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pa = vq->vring.used + offsetof(VRingUsed, flags); |
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stw_phys(pa, lduw_phys(pa) | mask); |
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} |
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static inline void vring_used_flags_unset_bit(VirtQueue *vq, int mask) |
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{ |
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target_phys_addr_t pa; |
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pa = vq->vring.used + offsetof(VRingUsed, flags); |
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stw_phys(pa, lduw_phys(pa) & ~mask); |
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} |
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static inline void vring_avail_event(VirtQueue *vq, uint16_t val) |
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{ |
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target_phys_addr_t pa; |
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if (!vq->notification) {
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return;
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} |
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pa = vq->vring.used + offsetof(VRingUsed, ring[vq->vring.num]); |
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stw_phys(pa, val); |
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} |
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void virtio_queue_set_notification(VirtQueue *vq, int enable) |
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{ |
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vq->notification = enable; |
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if (vq->vdev->guest_features & (1 << VIRTIO_RING_F_EVENT_IDX)) { |
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vring_avail_event(vq, vring_avail_idx(vq)); |
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} else if (enable) { |
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vring_used_flags_unset_bit(vq, VRING_USED_F_NO_NOTIFY); |
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} else {
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vring_used_flags_set_bit(vq, VRING_USED_F_NO_NOTIFY); |
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} |
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} |
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int virtio_queue_ready(VirtQueue *vq)
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{ |
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return vq->vring.avail != 0; |
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} |
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int virtio_queue_empty(VirtQueue *vq)
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{ |
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return vring_avail_idx(vq) == vq->last_avail_idx;
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} |
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void virtqueue_fill(VirtQueue *vq, const VirtQueueElement *elem, |
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unsigned int len, unsigned int idx) |
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{ |
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unsigned int offset; |
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int i;
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trace_virtqueue_fill(vq, elem, len, idx); |
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offset = 0;
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for (i = 0; i < elem->in_num; i++) { |
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size_t size = MIN(len - offset, elem->in_sg[i].iov_len); |
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cpu_physical_memory_unmap(elem->in_sg[i].iov_base, |
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elem->in_sg[i].iov_len, |
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1, size);
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offset += elem->in_sg[i].iov_len; |
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} |
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for (i = 0; i < elem->out_num; i++) |
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cpu_physical_memory_unmap(elem->out_sg[i].iov_base, |
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elem->out_sg[i].iov_len, |
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0, elem->out_sg[i].iov_len);
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idx = (idx + vring_used_idx(vq)) % vq->vring.num; |
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/* Get a pointer to the next entry in the used ring. */
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vring_used_ring_id(vq, idx, elem->index); |
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vring_used_ring_len(vq, idx, len); |
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} |
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void virtqueue_flush(VirtQueue *vq, unsigned int count) |
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{ |
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uint16_t old, new; |
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/* Make sure buffer is written before we update index. */
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wmb(); |
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trace_virtqueue_flush(vq, count); |
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old = vring_used_idx(vq); |
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new = old + count; |
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vring_used_idx_set(vq, new); |
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vq->inuse -= count; |
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if (unlikely((int16_t)(new - vq->signalled_used) < (uint16_t)(new - old)))
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vq->signalled_used_valid = false;
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} |
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void virtqueue_push(VirtQueue *vq, const VirtQueueElement *elem, |
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unsigned int len) |
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{ |
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virtqueue_fill(vq, elem, len, 0);
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virtqueue_flush(vq, 1);
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} |
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static int virtqueue_num_heads(VirtQueue *vq, unsigned int idx) |
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{ |
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uint16_t num_heads = vring_avail_idx(vq) - idx; |
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/* Check it isn't doing very strange things with descriptor numbers. */
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if (num_heads > vq->vring.num) {
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error_report("Guest moved used index from %u to %u",
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idx, vring_avail_idx(vq)); |
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exit(1);
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} |
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return num_heads;
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} |
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static unsigned int virtqueue_get_head(VirtQueue *vq, unsigned int idx) |
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{ |
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unsigned int head; |
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/* Grab the next descriptor number they're advertising, and increment
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* the index we've seen. */
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head = vring_avail_ring(vq, idx % vq->vring.num); |
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/* If their number is silly, that's a fatal mistake. */
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if (head >= vq->vring.num) {
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error_report("Guest says index %u is available", head);
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exit(1);
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} |
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return head;
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} |
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static unsigned virtqueue_next_desc(target_phys_addr_t desc_pa, |
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unsigned int i, unsigned int max) |
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{ |
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unsigned int next; |
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/* If this descriptor says it doesn't chain, we're done. */
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if (!(vring_desc_flags(desc_pa, i) & VRING_DESC_F_NEXT))
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return max;
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/* Check they're not leading us off end of descriptors. */
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next = vring_desc_next(desc_pa, i); |
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/* Make sure compiler knows to grab that: we don't want it changing! */
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wmb(); |
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if (next >= max) {
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error_report("Desc next is %u", next);
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exit(1);
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} |
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return next;
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} |
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int virtqueue_avail_bytes(VirtQueue *vq, int in_bytes, int out_bytes) |
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{ |
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unsigned int idx; |
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int total_bufs, in_total, out_total;
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idx = vq->last_avail_idx; |
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total_bufs = in_total = out_total = 0;
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while (virtqueue_num_heads(vq, idx)) {
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unsigned int max, num_bufs, indirect = 0; |
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target_phys_addr_t desc_pa; |
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int i;
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max = vq->vring.num; |
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num_bufs = total_bufs; |
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i = virtqueue_get_head(vq, idx++); |
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desc_pa = vq->vring.desc; |
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if (vring_desc_flags(desc_pa, i) & VRING_DESC_F_INDIRECT) {
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if (vring_desc_len(desc_pa, i) % sizeof(VRingDesc)) { |
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error_report("Invalid size for indirect buffer table");
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exit(1);
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} |
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/* If we've got too many, that implies a descriptor loop. */
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if (num_bufs >= max) {
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error_report("Looped descriptor");
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exit(1);
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} |
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/* loop over the indirect descriptor table */
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indirect = 1;
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max = vring_desc_len(desc_pa, i) / sizeof(VRingDesc);
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num_bufs = i = 0;
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desc_pa = vring_desc_addr(desc_pa, i); |
372 |
} |
373 |
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do {
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/* If we've got too many, that implies a descriptor loop. */
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376 |
if (++num_bufs > max) {
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error_report("Looped descriptor");
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exit(1);
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} |
380 |
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if (vring_desc_flags(desc_pa, i) & VRING_DESC_F_WRITE) {
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if (in_bytes > 0 && |
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(in_total += vring_desc_len(desc_pa, i)) >= in_bytes) |
384 |
return 1; |
385 |
} else {
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if (out_bytes > 0 && |
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(out_total += vring_desc_len(desc_pa, i)) >= out_bytes) |
388 |
return 1; |
389 |
} |
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} while ((i = virtqueue_next_desc(desc_pa, i, max)) != max);
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392 |
if (!indirect)
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total_bufs = num_bufs; |
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else
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total_bufs++; |
396 |
} |
397 |
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return 0; |
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} |
400 |
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void virtqueue_map_sg(struct iovec *sg, target_phys_addr_t *addr, |
402 |
size_t num_sg, int is_write)
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403 |
{ |
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unsigned int i; |
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target_phys_addr_t len; |
406 |
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for (i = 0; i < num_sg; i++) { |
408 |
len = sg[i].iov_len; |
409 |
sg[i].iov_base = cpu_physical_memory_map(addr[i], &len, is_write); |
410 |
if (sg[i].iov_base == NULL || len != sg[i].iov_len) { |
411 |
error_report("virtio: trying to map MMIO memory");
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exit(1);
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} |
414 |
} |
415 |
} |
416 |
|
417 |
int virtqueue_pop(VirtQueue *vq, VirtQueueElement *elem)
|
418 |
{ |
419 |
unsigned int i, head, max; |
420 |
target_phys_addr_t desc_pa = vq->vring.desc; |
421 |
|
422 |
if (!virtqueue_num_heads(vq, vq->last_avail_idx))
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423 |
return 0; |
424 |
|
425 |
/* When we start there are none of either input nor output. */
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426 |
elem->out_num = elem->in_num = 0;
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427 |
|
428 |
max = vq->vring.num; |
429 |
|
430 |
i = head = virtqueue_get_head(vq, vq->last_avail_idx++); |
431 |
if (vq->vdev->guest_features & (1 << VIRTIO_RING_F_EVENT_IDX)) { |
432 |
vring_avail_event(vq, vring_avail_idx(vq)); |
433 |
} |
434 |
|
435 |
if (vring_desc_flags(desc_pa, i) & VRING_DESC_F_INDIRECT) {
|
436 |
if (vring_desc_len(desc_pa, i) % sizeof(VRingDesc)) { |
437 |
error_report("Invalid size for indirect buffer table");
|
438 |
exit(1);
|
439 |
} |
440 |
|
441 |
/* loop over the indirect descriptor table */
|
442 |
max = vring_desc_len(desc_pa, i) / sizeof(VRingDesc);
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443 |
desc_pa = vring_desc_addr(desc_pa, i); |
444 |
i = 0;
|
445 |
} |
446 |
|
447 |
/* Collect all the descriptors */
|
448 |
do {
|
449 |
struct iovec *sg;
|
450 |
|
451 |
if (vring_desc_flags(desc_pa, i) & VRING_DESC_F_WRITE) {
|
452 |
if (elem->in_num >= ARRAY_SIZE(elem->in_sg)) {
|
453 |
error_report("Too many write descriptors in indirect table");
|
454 |
exit(1);
|
455 |
} |
456 |
elem->in_addr[elem->in_num] = vring_desc_addr(desc_pa, i); |
457 |
sg = &elem->in_sg[elem->in_num++]; |
458 |
} else {
|
459 |
if (elem->out_num >= ARRAY_SIZE(elem->out_sg)) {
|
460 |
error_report("Too many read descriptors in indirect table");
|
461 |
exit(1);
|
462 |
} |
463 |
elem->out_addr[elem->out_num] = vring_desc_addr(desc_pa, i); |
464 |
sg = &elem->out_sg[elem->out_num++]; |
465 |
} |
466 |
|
467 |
sg->iov_len = vring_desc_len(desc_pa, i); |
468 |
|
469 |
/* If we've got too many, that implies a descriptor loop. */
|
470 |
if ((elem->in_num + elem->out_num) > max) {
|
471 |
error_report("Looped descriptor");
|
472 |
exit(1);
|
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} |
474 |
} while ((i = virtqueue_next_desc(desc_pa, i, max)) != max);
|
475 |
|
476 |
/* Now map what we have collected */
|
477 |
virtqueue_map_sg(elem->in_sg, elem->in_addr, elem->in_num, 1);
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478 |
virtqueue_map_sg(elem->out_sg, elem->out_addr, elem->out_num, 0);
|
479 |
|
480 |
elem->index = head; |
481 |
|
482 |
vq->inuse++; |
483 |
|
484 |
trace_virtqueue_pop(vq, elem, elem->in_num, elem->out_num); |
485 |
return elem->in_num + elem->out_num;
|
486 |
} |
487 |
|
488 |
/* virtio device */
|
489 |
static void virtio_notify_vector(VirtIODevice *vdev, uint16_t vector) |
490 |
{ |
491 |
if (vdev->binding->notify) {
|
492 |
vdev->binding->notify(vdev->binding_opaque, vector); |
493 |
} |
494 |
} |
495 |
|
496 |
void virtio_update_irq(VirtIODevice *vdev)
|
497 |
{ |
498 |
virtio_notify_vector(vdev, VIRTIO_NO_VECTOR); |
499 |
} |
500 |
|
501 |
void virtio_reset(void *opaque) |
502 |
{ |
503 |
VirtIODevice *vdev = opaque; |
504 |
int i;
|
505 |
|
506 |
virtio_set_status(vdev, 0);
|
507 |
|
508 |
if (vdev->reset)
|
509 |
vdev->reset(vdev); |
510 |
|
511 |
vdev->guest_features = 0;
|
512 |
vdev->queue_sel = 0;
|
513 |
vdev->status = 0;
|
514 |
vdev->isr = 0;
|
515 |
vdev->config_vector = VIRTIO_NO_VECTOR; |
516 |
virtio_notify_vector(vdev, vdev->config_vector); |
517 |
|
518 |
for(i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) { |
519 |
vdev->vq[i].vring.desc = 0;
|
520 |
vdev->vq[i].vring.avail = 0;
|
521 |
vdev->vq[i].vring.used = 0;
|
522 |
vdev->vq[i].last_avail_idx = 0;
|
523 |
vdev->vq[i].pa = 0;
|
524 |
vdev->vq[i].vector = VIRTIO_NO_VECTOR; |
525 |
vdev->vq[i].signalled_used = 0;
|
526 |
vdev->vq[i].signalled_used_valid = false;
|
527 |
vdev->vq[i].notification = true;
|
528 |
} |
529 |
} |
530 |
|
531 |
uint32_t virtio_config_readb(VirtIODevice *vdev, uint32_t addr) |
532 |
{ |
533 |
uint8_t val; |
534 |
|
535 |
vdev->get_config(vdev, vdev->config); |
536 |
|
537 |
if (addr > (vdev->config_len - sizeof(val))) |
538 |
return (uint32_t)-1; |
539 |
|
540 |
memcpy(&val, vdev->config + addr, sizeof(val));
|
541 |
return val;
|
542 |
} |
543 |
|
544 |
uint32_t virtio_config_readw(VirtIODevice *vdev, uint32_t addr) |
545 |
{ |
546 |
uint16_t val; |
547 |
|
548 |
vdev->get_config(vdev, vdev->config); |
549 |
|
550 |
if (addr > (vdev->config_len - sizeof(val))) |
551 |
return (uint32_t)-1; |
552 |
|
553 |
memcpy(&val, vdev->config + addr, sizeof(val));
|
554 |
return val;
|
555 |
} |
556 |
|
557 |
uint32_t virtio_config_readl(VirtIODevice *vdev, uint32_t addr) |
558 |
{ |
559 |
uint32_t val; |
560 |
|
561 |
vdev->get_config(vdev, vdev->config); |
562 |
|
563 |
if (addr > (vdev->config_len - sizeof(val))) |
564 |
return (uint32_t)-1; |
565 |
|
566 |
memcpy(&val, vdev->config + addr, sizeof(val));
|
567 |
return val;
|
568 |
} |
569 |
|
570 |
void virtio_config_writeb(VirtIODevice *vdev, uint32_t addr, uint32_t data)
|
571 |
{ |
572 |
uint8_t val = data; |
573 |
|
574 |
if (addr > (vdev->config_len - sizeof(val))) |
575 |
return;
|
576 |
|
577 |
memcpy(vdev->config + addr, &val, sizeof(val));
|
578 |
|
579 |
if (vdev->set_config)
|
580 |
vdev->set_config(vdev, vdev->config); |
581 |
} |
582 |
|
583 |
void virtio_config_writew(VirtIODevice *vdev, uint32_t addr, uint32_t data)
|
584 |
{ |
585 |
uint16_t val = data; |
586 |
|
587 |
if (addr > (vdev->config_len - sizeof(val))) |
588 |
return;
|
589 |
|
590 |
memcpy(vdev->config + addr, &val, sizeof(val));
|
591 |
|
592 |
if (vdev->set_config)
|
593 |
vdev->set_config(vdev, vdev->config); |
594 |
} |
595 |
|
596 |
void virtio_config_writel(VirtIODevice *vdev, uint32_t addr, uint32_t data)
|
597 |
{ |
598 |
uint32_t val = data; |
599 |
|
600 |
if (addr > (vdev->config_len - sizeof(val))) |
601 |
return;
|
602 |
|
603 |
memcpy(vdev->config + addr, &val, sizeof(val));
|
604 |
|
605 |
if (vdev->set_config)
|
606 |
vdev->set_config(vdev, vdev->config); |
607 |
} |
608 |
|
609 |
void virtio_queue_set_addr(VirtIODevice *vdev, int n, target_phys_addr_t addr) |
610 |
{ |
611 |
vdev->vq[n].pa = addr; |
612 |
virtqueue_init(&vdev->vq[n]); |
613 |
} |
614 |
|
615 |
target_phys_addr_t virtio_queue_get_addr(VirtIODevice *vdev, int n)
|
616 |
{ |
617 |
return vdev->vq[n].pa;
|
618 |
} |
619 |
|
620 |
int virtio_queue_get_num(VirtIODevice *vdev, int n) |
621 |
{ |
622 |
return vdev->vq[n].vring.num;
|
623 |
} |
624 |
|
625 |
void virtio_queue_notify_vq(VirtQueue *vq)
|
626 |
{ |
627 |
if (vq->vring.desc) {
|
628 |
VirtIODevice *vdev = vq->vdev; |
629 |
trace_virtio_queue_notify(vdev, vq - vdev->vq, vq); |
630 |
vq->handle_output(vdev, vq); |
631 |
} |
632 |
} |
633 |
|
634 |
void virtio_queue_notify(VirtIODevice *vdev, int n) |
635 |
{ |
636 |
virtio_queue_notify_vq(&vdev->vq[n]); |
637 |
} |
638 |
|
639 |
uint16_t virtio_queue_vector(VirtIODevice *vdev, int n)
|
640 |
{ |
641 |
return n < VIRTIO_PCI_QUEUE_MAX ? vdev->vq[n].vector :
|
642 |
VIRTIO_NO_VECTOR; |
643 |
} |
644 |
|
645 |
void virtio_queue_set_vector(VirtIODevice *vdev, int n, uint16_t vector) |
646 |
{ |
647 |
if (n < VIRTIO_PCI_QUEUE_MAX)
|
648 |
vdev->vq[n].vector = vector; |
649 |
} |
650 |
|
651 |
VirtQueue *virtio_add_queue(VirtIODevice *vdev, int queue_size,
|
652 |
void (*handle_output)(VirtIODevice *, VirtQueue *))
|
653 |
{ |
654 |
int i;
|
655 |
|
656 |
for (i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) { |
657 |
if (vdev->vq[i].vring.num == 0) |
658 |
break;
|
659 |
} |
660 |
|
661 |
if (i == VIRTIO_PCI_QUEUE_MAX || queue_size > VIRTQUEUE_MAX_SIZE)
|
662 |
abort(); |
663 |
|
664 |
vdev->vq[i].vring.num = queue_size; |
665 |
vdev->vq[i].handle_output = handle_output; |
666 |
|
667 |
return &vdev->vq[i];
|
668 |
} |
669 |
|
670 |
void virtio_irq(VirtQueue *vq)
|
671 |
{ |
672 |
trace_virtio_irq(vq); |
673 |
vq->vdev->isr |= 0x01;
|
674 |
virtio_notify_vector(vq->vdev, vq->vector); |
675 |
} |
676 |
|
677 |
/* Assuming a given event_idx value from the other size, if
|
678 |
* we have just incremented index from old to new_idx,
|
679 |
* should we trigger an event? */
|
680 |
static inline int vring_need_event(uint16_t event, uint16_t new, uint16_t old) |
681 |
{ |
682 |
/* Note: Xen has similar logic for notification hold-off
|
683 |
* in include/xen/interface/io/ring.h with req_event and req_prod
|
684 |
* corresponding to event_idx + 1 and new respectively.
|
685 |
* Note also that req_event and req_prod in Xen start at 1,
|
686 |
* event indexes in virtio start at 0. */
|
687 |
return (uint16_t)(new - event - 1) < (uint16_t)(new - old); |
688 |
} |
689 |
|
690 |
static bool vring_notify(VirtIODevice *vdev, VirtQueue *vq) |
691 |
{ |
692 |
uint16_t old, new; |
693 |
bool v;
|
694 |
/* Always notify when queue is empty (when feature acknowledge) */
|
695 |
if (((vdev->guest_features & (1 << VIRTIO_F_NOTIFY_ON_EMPTY)) && |
696 |
!vq->inuse && vring_avail_idx(vq) == vq->last_avail_idx)) { |
697 |
return true; |
698 |
} |
699 |
|
700 |
if (!(vdev->guest_features & (1 << VIRTIO_RING_F_EVENT_IDX))) { |
701 |
return !(vring_avail_flags(vq) & VRING_AVAIL_F_NO_INTERRUPT);
|
702 |
} |
703 |
|
704 |
v = vq->signalled_used_valid; |
705 |
vq->signalled_used_valid = true;
|
706 |
old = vq->signalled_used; |
707 |
new = vq->signalled_used = vring_used_idx(vq); |
708 |
return !v || vring_need_event(vring_used_event(vq), new, old);
|
709 |
} |
710 |
|
711 |
void virtio_notify(VirtIODevice *vdev, VirtQueue *vq)
|
712 |
{ |
713 |
if (!vring_notify(vdev, vq)) {
|
714 |
return;
|
715 |
} |
716 |
|
717 |
trace_virtio_notify(vdev, vq); |
718 |
vdev->isr |= 0x01;
|
719 |
virtio_notify_vector(vdev, vq->vector); |
720 |
} |
721 |
|
722 |
void virtio_notify_config(VirtIODevice *vdev)
|
723 |
{ |
724 |
if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK))
|
725 |
return;
|
726 |
|
727 |
vdev->isr |= 0x03;
|
728 |
virtio_notify_vector(vdev, vdev->config_vector); |
729 |
} |
730 |
|
731 |
void virtio_save(VirtIODevice *vdev, QEMUFile *f)
|
732 |
{ |
733 |
int i;
|
734 |
|
735 |
if (vdev->binding->save_config)
|
736 |
vdev->binding->save_config(vdev->binding_opaque, f); |
737 |
|
738 |
qemu_put_8s(f, &vdev->status); |
739 |
qemu_put_8s(f, &vdev->isr); |
740 |
qemu_put_be16s(f, &vdev->queue_sel); |
741 |
qemu_put_be32s(f, &vdev->guest_features); |
742 |
qemu_put_be32(f, vdev->config_len); |
743 |
qemu_put_buffer(f, vdev->config, vdev->config_len); |
744 |
|
745 |
for (i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) { |
746 |
if (vdev->vq[i].vring.num == 0) |
747 |
break;
|
748 |
} |
749 |
|
750 |
qemu_put_be32(f, i); |
751 |
|
752 |
for (i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) { |
753 |
if (vdev->vq[i].vring.num == 0) |
754 |
break;
|
755 |
|
756 |
qemu_put_be32(f, vdev->vq[i].vring.num); |
757 |
qemu_put_be64(f, vdev->vq[i].pa); |
758 |
qemu_put_be16s(f, &vdev->vq[i].last_avail_idx); |
759 |
if (vdev->binding->save_queue)
|
760 |
vdev->binding->save_queue(vdev->binding_opaque, i, f); |
761 |
} |
762 |
} |
763 |
|
764 |
int virtio_load(VirtIODevice *vdev, QEMUFile *f)
|
765 |
{ |
766 |
int num, i, ret;
|
767 |
uint32_t features; |
768 |
uint32_t supported_features = |
769 |
vdev->binding->get_features(vdev->binding_opaque); |
770 |
|
771 |
if (vdev->binding->load_config) {
|
772 |
ret = vdev->binding->load_config(vdev->binding_opaque, f); |
773 |
if (ret)
|
774 |
return ret;
|
775 |
} |
776 |
|
777 |
qemu_get_8s(f, &vdev->status); |
778 |
qemu_get_8s(f, &vdev->isr); |
779 |
qemu_get_be16s(f, &vdev->queue_sel); |
780 |
qemu_get_be32s(f, &features); |
781 |
if (features & ~supported_features) {
|
782 |
error_report("Features 0x%x unsupported. Allowed features: 0x%x",
|
783 |
features, supported_features); |
784 |
return -1; |
785 |
} |
786 |
if (vdev->set_features)
|
787 |
vdev->set_features(vdev, features); |
788 |
vdev->guest_features = features; |
789 |
vdev->config_len = qemu_get_be32(f); |
790 |
qemu_get_buffer(f, vdev->config, vdev->config_len); |
791 |
|
792 |
num = qemu_get_be32(f); |
793 |
|
794 |
for (i = 0; i < num; i++) { |
795 |
vdev->vq[i].vring.num = qemu_get_be32(f); |
796 |
vdev->vq[i].pa = qemu_get_be64(f); |
797 |
qemu_get_be16s(f, &vdev->vq[i].last_avail_idx); |
798 |
vdev->vq[i].signalled_used_valid = false;
|
799 |
vdev->vq[i].notification = true;
|
800 |
|
801 |
if (vdev->vq[i].pa) {
|
802 |
uint16_t nheads; |
803 |
virtqueue_init(&vdev->vq[i]); |
804 |
nheads = vring_avail_idx(&vdev->vq[i]) - vdev->vq[i].last_avail_idx; |
805 |
/* Check it isn't doing very strange things with descriptor numbers. */
|
806 |
if (nheads > vdev->vq[i].vring.num) {
|
807 |
error_report("VQ %d size 0x%x Guest index 0x%x "
|
808 |
"inconsistent with Host index 0x%x: delta 0x%x",
|
809 |
i, vdev->vq[i].vring.num, |
810 |
vring_avail_idx(&vdev->vq[i]), |
811 |
vdev->vq[i].last_avail_idx, nheads); |
812 |
return -1; |
813 |
} |
814 |
} else if (vdev->vq[i].last_avail_idx) { |
815 |
error_report("VQ %d address 0x0 "
|
816 |
"inconsistent with Host index 0x%x",
|
817 |
i, vdev->vq[i].last_avail_idx); |
818 |
return -1; |
819 |
} |
820 |
if (vdev->binding->load_queue) {
|
821 |
ret = vdev->binding->load_queue(vdev->binding_opaque, i, f); |
822 |
if (ret)
|
823 |
return ret;
|
824 |
} |
825 |
} |
826 |
|
827 |
virtio_notify_vector(vdev, VIRTIO_NO_VECTOR); |
828 |
return 0; |
829 |
} |
830 |
|
831 |
void virtio_cleanup(VirtIODevice *vdev)
|
832 |
{ |
833 |
qemu_del_vm_change_state_handler(vdev->vmstate); |
834 |
if (vdev->config)
|
835 |
g_free(vdev->config); |
836 |
g_free(vdev->vq); |
837 |
g_free(vdev); |
838 |
} |
839 |
|
840 |
static void virtio_vmstate_change(void *opaque, int running, int reason) |
841 |
{ |
842 |
VirtIODevice *vdev = opaque; |
843 |
bool backend_run = running && (vdev->status & VIRTIO_CONFIG_S_DRIVER_OK);
|
844 |
vdev->vm_running = running; |
845 |
|
846 |
if (backend_run) {
|
847 |
virtio_set_status(vdev, vdev->status); |
848 |
} |
849 |
|
850 |
if (vdev->binding->vmstate_change) {
|
851 |
vdev->binding->vmstate_change(vdev->binding_opaque, backend_run); |
852 |
} |
853 |
|
854 |
if (!backend_run) {
|
855 |
virtio_set_status(vdev, vdev->status); |
856 |
} |
857 |
} |
858 |
|
859 |
VirtIODevice *virtio_common_init(const char *name, uint16_t device_id, |
860 |
size_t config_size, size_t struct_size) |
861 |
{ |
862 |
VirtIODevice *vdev; |
863 |
int i;
|
864 |
|
865 |
vdev = g_malloc0(struct_size); |
866 |
|
867 |
vdev->device_id = device_id; |
868 |
vdev->status = 0;
|
869 |
vdev->isr = 0;
|
870 |
vdev->queue_sel = 0;
|
871 |
vdev->config_vector = VIRTIO_NO_VECTOR; |
872 |
vdev->vq = g_malloc0(sizeof(VirtQueue) * VIRTIO_PCI_QUEUE_MAX);
|
873 |
vdev->vm_running = vm_running; |
874 |
for(i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) { |
875 |
vdev->vq[i].vector = VIRTIO_NO_VECTOR; |
876 |
vdev->vq[i].vdev = vdev; |
877 |
} |
878 |
|
879 |
vdev->name = name; |
880 |
vdev->config_len = config_size; |
881 |
if (vdev->config_len)
|
882 |
vdev->config = g_malloc0(config_size); |
883 |
else
|
884 |
vdev->config = NULL;
|
885 |
|
886 |
vdev->vmstate = qemu_add_vm_change_state_handler(virtio_vmstate_change, vdev); |
887 |
|
888 |
return vdev;
|
889 |
} |
890 |
|
891 |
void virtio_bind_device(VirtIODevice *vdev, const VirtIOBindings *binding, |
892 |
void *opaque)
|
893 |
{ |
894 |
vdev->binding = binding; |
895 |
vdev->binding_opaque = opaque; |
896 |
} |
897 |
|
898 |
target_phys_addr_t virtio_queue_get_desc_addr(VirtIODevice *vdev, int n)
|
899 |
{ |
900 |
return vdev->vq[n].vring.desc;
|
901 |
} |
902 |
|
903 |
target_phys_addr_t virtio_queue_get_avail_addr(VirtIODevice *vdev, int n)
|
904 |
{ |
905 |
return vdev->vq[n].vring.avail;
|
906 |
} |
907 |
|
908 |
target_phys_addr_t virtio_queue_get_used_addr(VirtIODevice *vdev, int n)
|
909 |
{ |
910 |
return vdev->vq[n].vring.used;
|
911 |
} |
912 |
|
913 |
target_phys_addr_t virtio_queue_get_ring_addr(VirtIODevice *vdev, int n)
|
914 |
{ |
915 |
return vdev->vq[n].vring.desc;
|
916 |
} |
917 |
|
918 |
target_phys_addr_t virtio_queue_get_desc_size(VirtIODevice *vdev, int n)
|
919 |
{ |
920 |
return sizeof(VRingDesc) * vdev->vq[n].vring.num; |
921 |
} |
922 |
|
923 |
target_phys_addr_t virtio_queue_get_avail_size(VirtIODevice *vdev, int n)
|
924 |
{ |
925 |
return offsetof(VRingAvail, ring) +
|
926 |
sizeof(uint64_t) * vdev->vq[n].vring.num;
|
927 |
} |
928 |
|
929 |
target_phys_addr_t virtio_queue_get_used_size(VirtIODevice *vdev, int n)
|
930 |
{ |
931 |
return offsetof(VRingUsed, ring) +
|
932 |
sizeof(VRingUsedElem) * vdev->vq[n].vring.num;
|
933 |
} |
934 |
|
935 |
target_phys_addr_t virtio_queue_get_ring_size(VirtIODevice *vdev, int n)
|
936 |
{ |
937 |
return vdev->vq[n].vring.used - vdev->vq[n].vring.desc +
|
938 |
virtio_queue_get_used_size(vdev, n); |
939 |
} |
940 |
|
941 |
uint16_t virtio_queue_get_last_avail_idx(VirtIODevice *vdev, int n)
|
942 |
{ |
943 |
return vdev->vq[n].last_avail_idx;
|
944 |
} |
945 |
|
946 |
void virtio_queue_set_last_avail_idx(VirtIODevice *vdev, int n, uint16_t idx) |
947 |
{ |
948 |
vdev->vq[n].last_avail_idx = idx; |
949 |
} |
950 |
|
951 |
VirtQueue *virtio_get_queue(VirtIODevice *vdev, int n)
|
952 |
{ |
953 |
return vdev->vq + n;
|
954 |
} |
955 |
|
956 |
EventNotifier *virtio_queue_get_guest_notifier(VirtQueue *vq) |
957 |
{ |
958 |
return &vq->guest_notifier;
|
959 |
} |
960 |
EventNotifier *virtio_queue_get_host_notifier(VirtQueue *vq) |
961 |
{ |
962 |
return &vq->host_notifier;
|
963 |
} |