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26b9b5fe17
Commit b1f416aa8d
breaks vhost_net
because it always registers the virtio_pci_host_notifier_read() handler
function on the ioeventfd, even when vhost_net.ko is using the ioeventfd.
The result is both QEMU and vhost_net.ko polling on the same eventfd
and the virtio_net.ko guest driver seeing inconsistent results:
# ifconfig eth0 192.168.0.1 netmask 255.255.255.0
virtio_net virtio0: output:id 0 is not a head!
To fix this, proceed the same as we do for irqfd: add a parameter to
virtio_queue_set_host_notifier_fd_handler and in that case only set
the notifier, not the handler.
Cc: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Tested-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Reviewed-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
1044 lines
28 KiB
C
1044 lines
28 KiB
C
/*
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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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#include "qemu-barrier.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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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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if (enable) {
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/* Expose avail event/used flags before caller checks the avail idx. */
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smp_mb();
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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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smp_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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/* On success, callers read a descriptor at vq->last_avail_idx.
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* Make sure descriptor read does not bypass avail index read. */
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if (num_heads) {
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smp_rmb();
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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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smp_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);
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}
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do {
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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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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)
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return 1;
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} else {
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if (out_bytes > 0 &&
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(out_total += vring_desc_len(desc_pa, i)) >= out_bytes)
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return 1;
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}
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} while ((i = virtqueue_next_desc(desc_pa, i, max)) != max);
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if (!indirect)
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total_bufs = num_bufs;
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else
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total_bufs++;
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}
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return 0;
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}
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void virtqueue_map_sg(struct iovec *sg, target_phys_addr_t *addr,
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size_t num_sg, int is_write)
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{
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unsigned int i;
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target_phys_addr_t len;
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for (i = 0; i < num_sg; i++) {
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len = sg[i].iov_len;
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sg[i].iov_base = cpu_physical_memory_map(addr[i], &len, is_write);
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if (sg[i].iov_base == NULL || len != sg[i].iov_len) {
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error_report("virtio: trying to map MMIO memory");
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exit(1);
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}
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}
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}
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int virtqueue_pop(VirtQueue *vq, VirtQueueElement *elem)
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{
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unsigned int i, head, max;
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target_phys_addr_t desc_pa = vq->vring.desc;
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if (!virtqueue_num_heads(vq, vq->last_avail_idx))
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return 0;
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/* When we start there are none of either input nor output. */
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elem->out_num = elem->in_num = 0;
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max = vq->vring.num;
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i = head = virtqueue_get_head(vq, vq->last_avail_idx++);
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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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}
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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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/* loop over the indirect descriptor table */
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max = vring_desc_len(desc_pa, i) / sizeof(VRingDesc);
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desc_pa = vring_desc_addr(desc_pa, i);
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i = 0;
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}
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/* Collect all the descriptors */
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do {
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struct iovec *sg;
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if (vring_desc_flags(desc_pa, i) & VRING_DESC_F_WRITE) {
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if (elem->in_num >= ARRAY_SIZE(elem->in_sg)) {
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error_report("Too many write descriptors in indirect table");
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exit(1);
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}
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elem->in_addr[elem->in_num] = vring_desc_addr(desc_pa, i);
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sg = &elem->in_sg[elem->in_num++];
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} else {
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if (elem->out_num >= ARRAY_SIZE(elem->out_sg)) {
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error_report("Too many read descriptors in indirect table");
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exit(1);
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}
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elem->out_addr[elem->out_num] = vring_desc_addr(desc_pa, i);
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sg = &elem->out_sg[elem->out_num++];
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}
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sg->iov_len = vring_desc_len(desc_pa, i);
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/* If we've got too many, that implies a descriptor loop. */
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if ((elem->in_num + elem->out_num) > max) {
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error_report("Looped descriptor");
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exit(1);
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}
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} while ((i = virtqueue_next_desc(desc_pa, i, max)) != max);
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/* Now map what we have collected */
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virtqueue_map_sg(elem->in_sg, elem->in_addr, elem->in_num, 1);
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virtqueue_map_sg(elem->out_sg, elem->out_addr, elem->out_num, 0);
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elem->index = head;
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vq->inuse++;
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|
|
trace_virtqueue_pop(vq, elem, elem->in_num, elem->out_num);
|
|
return elem->in_num + elem->out_num;
|
|
}
|
|
|
|
/* virtio device */
|
|
static void virtio_notify_vector(VirtIODevice *vdev, uint16_t vector)
|
|
{
|
|
if (vdev->binding->notify) {
|
|
vdev->binding->notify(vdev->binding_opaque, vector);
|
|
}
|
|
}
|
|
|
|
void virtio_update_irq(VirtIODevice *vdev)
|
|
{
|
|
virtio_notify_vector(vdev, VIRTIO_NO_VECTOR);
|
|
}
|
|
|
|
void virtio_set_status(VirtIODevice *vdev, uint8_t val)
|
|
{
|
|
trace_virtio_set_status(vdev, val);
|
|
|
|
if (vdev->set_status) {
|
|
vdev->set_status(vdev, val);
|
|
}
|
|
vdev->status = val;
|
|
}
|
|
|
|
void virtio_reset(void *opaque)
|
|
{
|
|
VirtIODevice *vdev = opaque;
|
|
int i;
|
|
|
|
virtio_set_status(vdev, 0);
|
|
|
|
if (vdev->reset)
|
|
vdev->reset(vdev);
|
|
|
|
vdev->guest_features = 0;
|
|
vdev->queue_sel = 0;
|
|
vdev->status = 0;
|
|
vdev->isr = 0;
|
|
vdev->config_vector = VIRTIO_NO_VECTOR;
|
|
virtio_notify_vector(vdev, vdev->config_vector);
|
|
|
|
for(i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) {
|
|
vdev->vq[i].vring.desc = 0;
|
|
vdev->vq[i].vring.avail = 0;
|
|
vdev->vq[i].vring.used = 0;
|
|
vdev->vq[i].last_avail_idx = 0;
|
|
vdev->vq[i].pa = 0;
|
|
vdev->vq[i].vector = VIRTIO_NO_VECTOR;
|
|
vdev->vq[i].signalled_used = 0;
|
|
vdev->vq[i].signalled_used_valid = false;
|
|
vdev->vq[i].notification = true;
|
|
}
|
|
}
|
|
|
|
uint32_t virtio_config_readb(VirtIODevice *vdev, uint32_t addr)
|
|
{
|
|
uint8_t val;
|
|
|
|
vdev->get_config(vdev, vdev->config);
|
|
|
|
if (addr > (vdev->config_len - sizeof(val)))
|
|
return (uint32_t)-1;
|
|
|
|
val = ldub_p(vdev->config + addr);
|
|
return val;
|
|
}
|
|
|
|
uint32_t virtio_config_readw(VirtIODevice *vdev, uint32_t addr)
|
|
{
|
|
uint16_t val;
|
|
|
|
vdev->get_config(vdev, vdev->config);
|
|
|
|
if (addr > (vdev->config_len - sizeof(val)))
|
|
return (uint32_t)-1;
|
|
|
|
val = lduw_p(vdev->config + addr);
|
|
return val;
|
|
}
|
|
|
|
uint32_t virtio_config_readl(VirtIODevice *vdev, uint32_t addr)
|
|
{
|
|
uint32_t val;
|
|
|
|
vdev->get_config(vdev, vdev->config);
|
|
|
|
if (addr > (vdev->config_len - sizeof(val)))
|
|
return (uint32_t)-1;
|
|
|
|
val = ldl_p(vdev->config + addr);
|
|
return val;
|
|
}
|
|
|
|
void virtio_config_writeb(VirtIODevice *vdev, uint32_t addr, uint32_t data)
|
|
{
|
|
uint8_t val = data;
|
|
|
|
if (addr > (vdev->config_len - sizeof(val)))
|
|
return;
|
|
|
|
stb_p(vdev->config + addr, val);
|
|
|
|
if (vdev->set_config)
|
|
vdev->set_config(vdev, vdev->config);
|
|
}
|
|
|
|
void virtio_config_writew(VirtIODevice *vdev, uint32_t addr, uint32_t data)
|
|
{
|
|
uint16_t val = data;
|
|
|
|
if (addr > (vdev->config_len - sizeof(val)))
|
|
return;
|
|
|
|
stw_p(vdev->config + addr, val);
|
|
|
|
if (vdev->set_config)
|
|
vdev->set_config(vdev, vdev->config);
|
|
}
|
|
|
|
void virtio_config_writel(VirtIODevice *vdev, uint32_t addr, uint32_t data)
|
|
{
|
|
uint32_t val = data;
|
|
|
|
if (addr > (vdev->config_len - sizeof(val)))
|
|
return;
|
|
|
|
stl_p(vdev->config + addr, val);
|
|
|
|
if (vdev->set_config)
|
|
vdev->set_config(vdev, vdev->config);
|
|
}
|
|
|
|
void virtio_queue_set_addr(VirtIODevice *vdev, int n, target_phys_addr_t addr)
|
|
{
|
|
vdev->vq[n].pa = addr;
|
|
virtqueue_init(&vdev->vq[n]);
|
|
}
|
|
|
|
target_phys_addr_t virtio_queue_get_addr(VirtIODevice *vdev, int n)
|
|
{
|
|
return vdev->vq[n].pa;
|
|
}
|
|
|
|
int virtio_queue_get_num(VirtIODevice *vdev, int n)
|
|
{
|
|
return vdev->vq[n].vring.num;
|
|
}
|
|
|
|
int virtio_queue_get_id(VirtQueue *vq)
|
|
{
|
|
VirtIODevice *vdev = vq->vdev;
|
|
assert(vq >= &vdev->vq[0] && vq < &vdev->vq[VIRTIO_PCI_QUEUE_MAX]);
|
|
return vq - &vdev->vq[0];
|
|
}
|
|
|
|
void virtio_queue_notify_vq(VirtQueue *vq)
|
|
{
|
|
if (vq->vring.desc) {
|
|
VirtIODevice *vdev = vq->vdev;
|
|
trace_virtio_queue_notify(vdev, vq - vdev->vq, vq);
|
|
vq->handle_output(vdev, vq);
|
|
}
|
|
}
|
|
|
|
void virtio_queue_notify(VirtIODevice *vdev, int n)
|
|
{
|
|
virtio_queue_notify_vq(&vdev->vq[n]);
|
|
}
|
|
|
|
uint16_t virtio_queue_vector(VirtIODevice *vdev, int n)
|
|
{
|
|
return n < VIRTIO_PCI_QUEUE_MAX ? vdev->vq[n].vector :
|
|
VIRTIO_NO_VECTOR;
|
|
}
|
|
|
|
void virtio_queue_set_vector(VirtIODevice *vdev, int n, uint16_t vector)
|
|
{
|
|
if (n < VIRTIO_PCI_QUEUE_MAX)
|
|
vdev->vq[n].vector = vector;
|
|
}
|
|
|
|
VirtQueue *virtio_add_queue(VirtIODevice *vdev, int queue_size,
|
|
void (*handle_output)(VirtIODevice *, VirtQueue *))
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) {
|
|
if (vdev->vq[i].vring.num == 0)
|
|
break;
|
|
}
|
|
|
|
if (i == VIRTIO_PCI_QUEUE_MAX || queue_size > VIRTQUEUE_MAX_SIZE)
|
|
abort();
|
|
|
|
vdev->vq[i].vring.num = queue_size;
|
|
vdev->vq[i].handle_output = handle_output;
|
|
|
|
return &vdev->vq[i];
|
|
}
|
|
|
|
void virtio_irq(VirtQueue *vq)
|
|
{
|
|
trace_virtio_irq(vq);
|
|
vq->vdev->isr |= 0x01;
|
|
virtio_notify_vector(vq->vdev, vq->vector);
|
|
}
|
|
|
|
/* Assuming a given event_idx value from the other size, if
|
|
* we have just incremented index from old to new_idx,
|
|
* should we trigger an event? */
|
|
static inline int vring_need_event(uint16_t event, uint16_t new, uint16_t old)
|
|
{
|
|
/* Note: Xen has similar logic for notification hold-off
|
|
* in include/xen/interface/io/ring.h with req_event and req_prod
|
|
* corresponding to event_idx + 1 and new respectively.
|
|
* Note also that req_event and req_prod in Xen start at 1,
|
|
* event indexes in virtio start at 0. */
|
|
return (uint16_t)(new - event - 1) < (uint16_t)(new - old);
|
|
}
|
|
|
|
static bool vring_notify(VirtIODevice *vdev, VirtQueue *vq)
|
|
{
|
|
uint16_t old, new;
|
|
bool v;
|
|
/* We need to expose used array entries before checking used event. */
|
|
smp_mb();
|
|
/* Always notify when queue is empty (when feature acknowledge) */
|
|
if (((vdev->guest_features & (1 << VIRTIO_F_NOTIFY_ON_EMPTY)) &&
|
|
!vq->inuse && vring_avail_idx(vq) == vq->last_avail_idx)) {
|
|
return true;
|
|
}
|
|
|
|
if (!(vdev->guest_features & (1 << VIRTIO_RING_F_EVENT_IDX))) {
|
|
return !(vring_avail_flags(vq) & VRING_AVAIL_F_NO_INTERRUPT);
|
|
}
|
|
|
|
v = vq->signalled_used_valid;
|
|
vq->signalled_used_valid = true;
|
|
old = vq->signalled_used;
|
|
new = vq->signalled_used = vring_used_idx(vq);
|
|
return !v || vring_need_event(vring_used_event(vq), new, old);
|
|
}
|
|
|
|
void virtio_notify(VirtIODevice *vdev, VirtQueue *vq)
|
|
{
|
|
if (!vring_notify(vdev, vq)) {
|
|
return;
|
|
}
|
|
|
|
trace_virtio_notify(vdev, vq);
|
|
vdev->isr |= 0x01;
|
|
virtio_notify_vector(vdev, vq->vector);
|
|
}
|
|
|
|
void virtio_notify_config(VirtIODevice *vdev)
|
|
{
|
|
if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK))
|
|
return;
|
|
|
|
vdev->isr |= 0x03;
|
|
virtio_notify_vector(vdev, vdev->config_vector);
|
|
}
|
|
|
|
void virtio_save(VirtIODevice *vdev, QEMUFile *f)
|
|
{
|
|
int i;
|
|
|
|
if (vdev->binding->save_config)
|
|
vdev->binding->save_config(vdev->binding_opaque, f);
|
|
|
|
qemu_put_8s(f, &vdev->status);
|
|
qemu_put_8s(f, &vdev->isr);
|
|
qemu_put_be16s(f, &vdev->queue_sel);
|
|
qemu_put_be32s(f, &vdev->guest_features);
|
|
qemu_put_be32(f, vdev->config_len);
|
|
qemu_put_buffer(f, vdev->config, vdev->config_len);
|
|
|
|
for (i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) {
|
|
if (vdev->vq[i].vring.num == 0)
|
|
break;
|
|
}
|
|
|
|
qemu_put_be32(f, i);
|
|
|
|
for (i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) {
|
|
if (vdev->vq[i].vring.num == 0)
|
|
break;
|
|
|
|
qemu_put_be32(f, vdev->vq[i].vring.num);
|
|
qemu_put_be64(f, vdev->vq[i].pa);
|
|
qemu_put_be16s(f, &vdev->vq[i].last_avail_idx);
|
|
if (vdev->binding->save_queue)
|
|
vdev->binding->save_queue(vdev->binding_opaque, i, f);
|
|
}
|
|
}
|
|
|
|
int virtio_set_features(VirtIODevice *vdev, uint32_t val)
|
|
{
|
|
uint32_t supported_features =
|
|
vdev->binding->get_features(vdev->binding_opaque);
|
|
bool bad = (val & ~supported_features) != 0;
|
|
|
|
val &= supported_features;
|
|
if (vdev->set_features) {
|
|
vdev->set_features(vdev, val);
|
|
}
|
|
vdev->guest_features = val;
|
|
return bad ? -1 : 0;
|
|
}
|
|
|
|
int virtio_load(VirtIODevice *vdev, QEMUFile *f)
|
|
{
|
|
int num, i, ret;
|
|
uint32_t features;
|
|
uint32_t supported_features;
|
|
|
|
if (vdev->binding->load_config) {
|
|
ret = vdev->binding->load_config(vdev->binding_opaque, f);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
qemu_get_8s(f, &vdev->status);
|
|
qemu_get_8s(f, &vdev->isr);
|
|
qemu_get_be16s(f, &vdev->queue_sel);
|
|
qemu_get_be32s(f, &features);
|
|
|
|
if (virtio_set_features(vdev, features) < 0) {
|
|
supported_features = vdev->binding->get_features(vdev->binding_opaque);
|
|
error_report("Features 0x%x unsupported. Allowed features: 0x%x",
|
|
features, supported_features);
|
|
return -1;
|
|
}
|
|
vdev->config_len = qemu_get_be32(f);
|
|
qemu_get_buffer(f, vdev->config, vdev->config_len);
|
|
|
|
num = qemu_get_be32(f);
|
|
|
|
for (i = 0; i < num; i++) {
|
|
vdev->vq[i].vring.num = qemu_get_be32(f);
|
|
vdev->vq[i].pa = qemu_get_be64(f);
|
|
qemu_get_be16s(f, &vdev->vq[i].last_avail_idx);
|
|
vdev->vq[i].signalled_used_valid = false;
|
|
vdev->vq[i].notification = true;
|
|
|
|
if (vdev->vq[i].pa) {
|
|
uint16_t nheads;
|
|
virtqueue_init(&vdev->vq[i]);
|
|
nheads = vring_avail_idx(&vdev->vq[i]) - vdev->vq[i].last_avail_idx;
|
|
/* Check it isn't doing very strange things with descriptor numbers. */
|
|
if (nheads > vdev->vq[i].vring.num) {
|
|
error_report("VQ %d size 0x%x Guest index 0x%x "
|
|
"inconsistent with Host index 0x%x: delta 0x%x",
|
|
i, vdev->vq[i].vring.num,
|
|
vring_avail_idx(&vdev->vq[i]),
|
|
vdev->vq[i].last_avail_idx, nheads);
|
|
return -1;
|
|
}
|
|
} else if (vdev->vq[i].last_avail_idx) {
|
|
error_report("VQ %d address 0x0 "
|
|
"inconsistent with Host index 0x%x",
|
|
i, vdev->vq[i].last_avail_idx);
|
|
return -1;
|
|
}
|
|
if (vdev->binding->load_queue) {
|
|
ret = vdev->binding->load_queue(vdev->binding_opaque, i, f);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
virtio_notify_vector(vdev, VIRTIO_NO_VECTOR);
|
|
return 0;
|
|
}
|
|
|
|
void virtio_cleanup(VirtIODevice *vdev)
|
|
{
|
|
qemu_del_vm_change_state_handler(vdev->vmstate);
|
|
g_free(vdev->config);
|
|
g_free(vdev->vq);
|
|
g_free(vdev);
|
|
}
|
|
|
|
static void virtio_vmstate_change(void *opaque, int running, RunState state)
|
|
{
|
|
VirtIODevice *vdev = opaque;
|
|
bool backend_run = running && (vdev->status & VIRTIO_CONFIG_S_DRIVER_OK);
|
|
vdev->vm_running = running;
|
|
|
|
if (backend_run) {
|
|
virtio_set_status(vdev, vdev->status);
|
|
}
|
|
|
|
if (vdev->binding->vmstate_change) {
|
|
vdev->binding->vmstate_change(vdev->binding_opaque, backend_run);
|
|
}
|
|
|
|
if (!backend_run) {
|
|
virtio_set_status(vdev, vdev->status);
|
|
}
|
|
}
|
|
|
|
VirtIODevice *virtio_common_init(const char *name, uint16_t device_id,
|
|
size_t config_size, size_t struct_size)
|
|
{
|
|
VirtIODevice *vdev;
|
|
int i;
|
|
|
|
vdev = g_malloc0(struct_size);
|
|
|
|
vdev->device_id = device_id;
|
|
vdev->status = 0;
|
|
vdev->isr = 0;
|
|
vdev->queue_sel = 0;
|
|
vdev->config_vector = VIRTIO_NO_VECTOR;
|
|
vdev->vq = g_malloc0(sizeof(VirtQueue) * VIRTIO_PCI_QUEUE_MAX);
|
|
vdev->vm_running = runstate_is_running();
|
|
for(i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) {
|
|
vdev->vq[i].vector = VIRTIO_NO_VECTOR;
|
|
vdev->vq[i].vdev = vdev;
|
|
}
|
|
|
|
vdev->name = name;
|
|
vdev->config_len = config_size;
|
|
if (vdev->config_len)
|
|
vdev->config = g_malloc0(config_size);
|
|
else
|
|
vdev->config = NULL;
|
|
|
|
vdev->vmstate = qemu_add_vm_change_state_handler(virtio_vmstate_change, vdev);
|
|
|
|
return vdev;
|
|
}
|
|
|
|
void virtio_bind_device(VirtIODevice *vdev, const VirtIOBindings *binding,
|
|
void *opaque)
|
|
{
|
|
vdev->binding = binding;
|
|
vdev->binding_opaque = opaque;
|
|
}
|
|
|
|
target_phys_addr_t virtio_queue_get_desc_addr(VirtIODevice *vdev, int n)
|
|
{
|
|
return vdev->vq[n].vring.desc;
|
|
}
|
|
|
|
target_phys_addr_t virtio_queue_get_avail_addr(VirtIODevice *vdev, int n)
|
|
{
|
|
return vdev->vq[n].vring.avail;
|
|
}
|
|
|
|
target_phys_addr_t virtio_queue_get_used_addr(VirtIODevice *vdev, int n)
|
|
{
|
|
return vdev->vq[n].vring.used;
|
|
}
|
|
|
|
target_phys_addr_t virtio_queue_get_ring_addr(VirtIODevice *vdev, int n)
|
|
{
|
|
return vdev->vq[n].vring.desc;
|
|
}
|
|
|
|
target_phys_addr_t virtio_queue_get_desc_size(VirtIODevice *vdev, int n)
|
|
{
|
|
return sizeof(VRingDesc) * vdev->vq[n].vring.num;
|
|
}
|
|
|
|
target_phys_addr_t virtio_queue_get_avail_size(VirtIODevice *vdev, int n)
|
|
{
|
|
return offsetof(VRingAvail, ring) +
|
|
sizeof(uint64_t) * vdev->vq[n].vring.num;
|
|
}
|
|
|
|
target_phys_addr_t virtio_queue_get_used_size(VirtIODevice *vdev, int n)
|
|
{
|
|
return offsetof(VRingUsed, ring) +
|
|
sizeof(VRingUsedElem) * vdev->vq[n].vring.num;
|
|
}
|
|
|
|
target_phys_addr_t virtio_queue_get_ring_size(VirtIODevice *vdev, int n)
|
|
{
|
|
return vdev->vq[n].vring.used - vdev->vq[n].vring.desc +
|
|
virtio_queue_get_used_size(vdev, n);
|
|
}
|
|
|
|
uint16_t virtio_queue_get_last_avail_idx(VirtIODevice *vdev, int n)
|
|
{
|
|
return vdev->vq[n].last_avail_idx;
|
|
}
|
|
|
|
void virtio_queue_set_last_avail_idx(VirtIODevice *vdev, int n, uint16_t idx)
|
|
{
|
|
vdev->vq[n].last_avail_idx = idx;
|
|
}
|
|
|
|
VirtQueue *virtio_get_queue(VirtIODevice *vdev, int n)
|
|
{
|
|
return vdev->vq + n;
|
|
}
|
|
|
|
static void virtio_queue_guest_notifier_read(EventNotifier *n)
|
|
{
|
|
VirtQueue *vq = container_of(n, VirtQueue, guest_notifier);
|
|
if (event_notifier_test_and_clear(n)) {
|
|
virtio_irq(vq);
|
|
}
|
|
}
|
|
|
|
void virtio_queue_set_guest_notifier_fd_handler(VirtQueue *vq, bool assign,
|
|
bool with_irqfd)
|
|
{
|
|
if (assign && !with_irqfd) {
|
|
event_notifier_set_handler(&vq->guest_notifier,
|
|
virtio_queue_guest_notifier_read);
|
|
} else {
|
|
event_notifier_set_handler(&vq->guest_notifier, NULL);
|
|
}
|
|
if (!assign) {
|
|
/* Test and clear notifier before closing it,
|
|
* in case poll callback didn't have time to run. */
|
|
virtio_queue_guest_notifier_read(&vq->guest_notifier);
|
|
}
|
|
}
|
|
|
|
EventNotifier *virtio_queue_get_guest_notifier(VirtQueue *vq)
|
|
{
|
|
return &vq->guest_notifier;
|
|
}
|
|
|
|
static void virtio_queue_host_notifier_read(EventNotifier *n)
|
|
{
|
|
VirtQueue *vq = container_of(n, VirtQueue, host_notifier);
|
|
if (event_notifier_test_and_clear(n)) {
|
|
virtio_queue_notify_vq(vq);
|
|
}
|
|
}
|
|
|
|
void virtio_queue_set_host_notifier_fd_handler(VirtQueue *vq, bool assign,
|
|
bool set_handler)
|
|
{
|
|
if (assign && set_handler) {
|
|
event_notifier_set_handler(&vq->host_notifier,
|
|
virtio_queue_host_notifier_read);
|
|
} else {
|
|
event_notifier_set_handler(&vq->host_notifier, NULL);
|
|
}
|
|
if (!assign) {
|
|
/* Test and clear notifier before after disabling event,
|
|
* in case poll callback didn't have time to run. */
|
|
virtio_queue_host_notifier_read(&vq->host_notifier);
|
|
}
|
|
}
|
|
|
|
EventNotifier *virtio_queue_get_host_notifier(VirtQueue *vq)
|
|
{
|
|
return &vq->host_notifier;
|
|
}
|