811 lines
21 KiB
C
811 lines
21 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 "virtio.h"
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#include "sysemu.h"
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/* from Linux's linux/virtio_pci.h */
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/* A 32-bit r/o bitmask of the features supported by the host */
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#define VIRTIO_PCI_HOST_FEATURES 0
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/* A 32-bit r/w bitmask of features activated by the guest */
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#define VIRTIO_PCI_GUEST_FEATURES 4
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/* A 32-bit r/w PFN for the currently selected queue */
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#define VIRTIO_PCI_QUEUE_PFN 8
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/* A 16-bit r/o queue size for the currently selected queue */
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#define VIRTIO_PCI_QUEUE_NUM 12
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/* A 16-bit r/w queue selector */
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#define VIRTIO_PCI_QUEUE_SEL 14
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/* A 16-bit r/w queue notifier */
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#define VIRTIO_PCI_QUEUE_NOTIFY 16
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/* An 8-bit device status register. */
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#define VIRTIO_PCI_STATUS 18
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/* An 8-bit r/o interrupt status register. Reading the value will return the
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* current contents of the ISR and will also clear it. This is effectively
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* a read-and-acknowledge. */
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#define VIRTIO_PCI_ISR 19
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#define VIRTIO_PCI_CONFIG 20
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/* Virtio ABI version, if we increment this, we break the guest driver. */
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#define VIRTIO_PCI_ABI_VERSION 0
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/* How many bits to shift physical queue address written to QUEUE_PFN.
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* 12 is historical, and due to x86 page size. */
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#define VIRTIO_PCI_QUEUE_ADDR_SHIFT 12
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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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*/
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#define wmb() do { } while (0)
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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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uint32_t pfn;
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uint16_t last_avail_idx;
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int inuse;
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void (*handle_output)(VirtIODevice *vdev, VirtQueue *vq);
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};
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#define VIRTIO_PCI_QUEUE_MAX 16
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/* virt queue functions */
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static void virtqueue_init(VirtQueue *vq, target_phys_addr_t pa)
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{
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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(VirtQueue *vq, int i)
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{
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target_phys_addr_t pa;
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pa = vq->vring.desc + 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(VirtQueue *vq, int i)
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{
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target_phys_addr_t pa;
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pa = vq->vring.desc + 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(VirtQueue *vq, int i)
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{
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target_phys_addr_t pa;
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pa = vq->vring.desc + 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(VirtQueue *vq, int i)
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{
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target_phys_addr_t pa;
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pa = vq->vring.desc + 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 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_increment(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, vring_used_idx(vq) + 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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void virtio_queue_set_notification(VirtQueue *vq, int enable)
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{
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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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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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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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/* Make sure buffer is written before we update index. */
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wmb();
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vring_used_idx_increment(vq, count);
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vq->inuse -= count;
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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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fprintf(stderr, "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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fprintf(stderr, "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(VirtQueue *vq, unsigned int i)
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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(vq, i) & VRING_DESC_F_NEXT))
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return vq->vring.num;
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/* Check they're not leading us off end of descriptors. */
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next = vring_desc_next(vq, 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 >= vq->vring.num) {
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fprintf(stderr, "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 num_bufs, in_total, out_total;
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idx = vq->last_avail_idx;
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num_bufs = in_total = out_total = 0;
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while (virtqueue_num_heads(vq, idx)) {
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int i;
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i = virtqueue_get_head(vq, idx++);
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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 > vq->vring.num) {
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fprintf(stderr, "Looped descriptor");
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exit(1);
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}
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if (vring_desc_flags(vq, i) & VRING_DESC_F_WRITE) {
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if (in_bytes > 0 &&
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(in_total += vring_desc_len(vq, 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(vq, i)) >= out_bytes)
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return 1;
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}
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} while ((i = virtqueue_next_desc(vq, i)) != vq->vring.num);
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}
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return 0;
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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;
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target_phys_addr_t len;
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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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i = head = virtqueue_get_head(vq, vq->last_avail_idx++);
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do {
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struct iovec *sg;
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int is_write = 0;
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if (vring_desc_flags(vq, i) & VRING_DESC_F_WRITE) {
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elem->in_addr[elem->in_num] = vring_desc_addr(vq, i);
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sg = &elem->in_sg[elem->in_num++];
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is_write = 1;
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} else
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sg = &elem->out_sg[elem->out_num++];
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/* Grab the first descriptor, and check it's OK. */
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sg->iov_len = vring_desc_len(vq, i);
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len = sg->iov_len;
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sg->iov_base = cpu_physical_memory_map(vring_desc_addr(vq, i), &len, is_write);
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if (sg->iov_base == NULL || len != sg->iov_len) {
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fprintf(stderr, "virtio: trying to map MMIO memory\n");
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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 ((elem->in_num + elem->out_num) > vq->vring.num) {
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fprintf(stderr, "Looped descriptor");
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exit(1);
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}
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} while ((i = virtqueue_next_desc(vq, i)) != vq->vring.num);
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elem->index = head;
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vq->inuse++;
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return elem->in_num + elem->out_num;
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}
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/* virtio device */
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static VirtIODevice *to_virtio_device(PCIDevice *pci_dev)
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{
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return (VirtIODevice *)pci_dev;
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}
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static void virtio_update_irq(VirtIODevice *vdev)
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{
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qemu_set_irq(vdev->pci_dev.irq[0], vdev->isr & 1);
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}
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static void virtio_reset(void *opaque)
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{
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VirtIODevice *vdev = opaque;
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int i;
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if (vdev->reset)
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vdev->reset(vdev);
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vdev->features = 0;
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vdev->queue_sel = 0;
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vdev->status = 0;
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vdev->isr = 0;
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virtio_update_irq(vdev);
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for(i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) {
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vdev->vq[i].vring.desc = 0;
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vdev->vq[i].vring.avail = 0;
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vdev->vq[i].vring.used = 0;
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vdev->vq[i].last_avail_idx = 0;
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vdev->vq[i].pfn = 0;
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}
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}
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static void virtio_ioport_write(void *opaque, uint32_t addr, uint32_t val)
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{
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VirtIODevice *vdev = to_virtio_device(opaque);
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ram_addr_t pa;
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addr -= vdev->addr;
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switch (addr) {
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case VIRTIO_PCI_GUEST_FEATURES:
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/* Guest does not negotiate properly? We have to assume nothing. */
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if (val & (1 << VIRTIO_F_BAD_FEATURE)) {
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if (vdev->bad_features)
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val = vdev->bad_features(vdev);
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else
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val = 0;
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}
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if (vdev->set_features)
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vdev->set_features(vdev, val);
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vdev->features = val;
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break;
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case VIRTIO_PCI_QUEUE_PFN:
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pa = (ram_addr_t)val << VIRTIO_PCI_QUEUE_ADDR_SHIFT;
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vdev->vq[vdev->queue_sel].pfn = val;
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if (pa == 0) {
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virtio_reset(vdev);
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} else {
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virtqueue_init(&vdev->vq[vdev->queue_sel], pa);
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}
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break;
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case VIRTIO_PCI_QUEUE_SEL:
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if (val < VIRTIO_PCI_QUEUE_MAX)
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vdev->queue_sel = val;
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break;
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case VIRTIO_PCI_QUEUE_NOTIFY:
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if (val < VIRTIO_PCI_QUEUE_MAX && vdev->vq[val].vring.desc)
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vdev->vq[val].handle_output(vdev, &vdev->vq[val]);
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break;
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case VIRTIO_PCI_STATUS:
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vdev->status = val & 0xFF;
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if (vdev->status == 0)
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virtio_reset(vdev);
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break;
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}
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}
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static uint32_t virtio_ioport_read(void *opaque, uint32_t addr)
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{
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VirtIODevice *vdev = to_virtio_device(opaque);
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uint32_t ret = 0xFFFFFFFF;
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addr -= vdev->addr;
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switch (addr) {
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case VIRTIO_PCI_HOST_FEATURES:
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ret = vdev->get_features(vdev);
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ret |= (1 << VIRTIO_F_NOTIFY_ON_EMPTY) | (1 << VIRTIO_F_BAD_FEATURE);
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break;
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case VIRTIO_PCI_GUEST_FEATURES:
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ret = vdev->features;
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break;
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case VIRTIO_PCI_QUEUE_PFN:
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ret = vdev->vq[vdev->queue_sel].pfn;
|
|
break;
|
|
case VIRTIO_PCI_QUEUE_NUM:
|
|
ret = vdev->vq[vdev->queue_sel].vring.num;
|
|
break;
|
|
case VIRTIO_PCI_QUEUE_SEL:
|
|
ret = vdev->queue_sel;
|
|
break;
|
|
case VIRTIO_PCI_STATUS:
|
|
ret = vdev->status;
|
|
break;
|
|
case VIRTIO_PCI_ISR:
|
|
/* reading from the ISR also clears it. */
|
|
ret = vdev->isr;
|
|
vdev->isr = 0;
|
|
virtio_update_irq(vdev);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static uint32_t virtio_config_readb(void *opaque, uint32_t addr)
|
|
{
|
|
VirtIODevice *vdev = opaque;
|
|
uint8_t val;
|
|
|
|
vdev->get_config(vdev, vdev->config);
|
|
|
|
addr -= vdev->addr + VIRTIO_PCI_CONFIG;
|
|
if (addr > (vdev->config_len - sizeof(val)))
|
|
return (uint32_t)-1;
|
|
|
|
memcpy(&val, vdev->config + addr, sizeof(val));
|
|
return val;
|
|
}
|
|
|
|
static uint32_t virtio_config_readw(void *opaque, uint32_t addr)
|
|
{
|
|
VirtIODevice *vdev = opaque;
|
|
uint16_t val;
|
|
|
|
vdev->get_config(vdev, vdev->config);
|
|
|
|
addr -= vdev->addr + VIRTIO_PCI_CONFIG;
|
|
if (addr > (vdev->config_len - sizeof(val)))
|
|
return (uint32_t)-1;
|
|
|
|
memcpy(&val, vdev->config + addr, sizeof(val));
|
|
return val;
|
|
}
|
|
|
|
static uint32_t virtio_config_readl(void *opaque, uint32_t addr)
|
|
{
|
|
VirtIODevice *vdev = opaque;
|
|
uint32_t val;
|
|
|
|
vdev->get_config(vdev, vdev->config);
|
|
|
|
addr -= vdev->addr + VIRTIO_PCI_CONFIG;
|
|
if (addr > (vdev->config_len - sizeof(val)))
|
|
return (uint32_t)-1;
|
|
|
|
memcpy(&val, vdev->config + addr, sizeof(val));
|
|
return val;
|
|
}
|
|
|
|
static void virtio_config_writeb(void *opaque, uint32_t addr, uint32_t data)
|
|
{
|
|
VirtIODevice *vdev = opaque;
|
|
uint8_t val = data;
|
|
|
|
addr -= vdev->addr + VIRTIO_PCI_CONFIG;
|
|
if (addr > (vdev->config_len - sizeof(val)))
|
|
return;
|
|
|
|
memcpy(vdev->config + addr, &val, sizeof(val));
|
|
|
|
if (vdev->set_config)
|
|
vdev->set_config(vdev, vdev->config);
|
|
}
|
|
|
|
static void virtio_config_writew(void *opaque, uint32_t addr, uint32_t data)
|
|
{
|
|
VirtIODevice *vdev = opaque;
|
|
uint16_t val = data;
|
|
|
|
addr -= vdev->addr + VIRTIO_PCI_CONFIG;
|
|
if (addr > (vdev->config_len - sizeof(val)))
|
|
return;
|
|
|
|
memcpy(vdev->config + addr, &val, sizeof(val));
|
|
|
|
if (vdev->set_config)
|
|
vdev->set_config(vdev, vdev->config);
|
|
}
|
|
|
|
static void virtio_config_writel(void *opaque, uint32_t addr, uint32_t data)
|
|
{
|
|
VirtIODevice *vdev = opaque;
|
|
uint32_t val = data;
|
|
|
|
addr -= vdev->addr + VIRTIO_PCI_CONFIG;
|
|
if (addr > (vdev->config_len - sizeof(val)))
|
|
return;
|
|
|
|
memcpy(vdev->config + addr, &val, sizeof(val));
|
|
|
|
if (vdev->set_config)
|
|
vdev->set_config(vdev, vdev->config);
|
|
}
|
|
|
|
static void virtio_map(PCIDevice *pci_dev, int region_num,
|
|
uint32_t addr, uint32_t size, int type)
|
|
{
|
|
VirtIODevice *vdev = to_virtio_device(pci_dev);
|
|
int i;
|
|
|
|
vdev->addr = addr;
|
|
for (i = 0; i < 3; i++) {
|
|
register_ioport_write(addr, 20, 1 << i, virtio_ioport_write, vdev);
|
|
register_ioport_read(addr, 20, 1 << i, virtio_ioport_read, vdev);
|
|
}
|
|
|
|
if (vdev->config_len) {
|
|
register_ioport_write(addr + 20, vdev->config_len, 1,
|
|
virtio_config_writeb, vdev);
|
|
register_ioport_write(addr + 20, vdev->config_len, 2,
|
|
virtio_config_writew, vdev);
|
|
register_ioport_write(addr + 20, vdev->config_len, 4,
|
|
virtio_config_writel, vdev);
|
|
register_ioport_read(addr + 20, vdev->config_len, 1,
|
|
virtio_config_readb, vdev);
|
|
register_ioport_read(addr + 20, vdev->config_len, 2,
|
|
virtio_config_readw, vdev);
|
|
register_ioport_read(addr + 20, vdev->config_len, 4,
|
|
virtio_config_readl, vdev);
|
|
|
|
vdev->get_config(vdev, vdev->config);
|
|
}
|
|
}
|
|
|
|
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_notify(VirtIODevice *vdev, VirtQueue *vq)
|
|
{
|
|
/* Always notify when queue is empty (when feature acknowledge) */
|
|
if ((vring_avail_flags(vq) & VRING_AVAIL_F_NO_INTERRUPT) &&
|
|
(!(vdev->features & (1 << VIRTIO_F_NOTIFY_ON_EMPTY)) ||
|
|
(vq->inuse || vring_avail_idx(vq) != vq->last_avail_idx)))
|
|
return;
|
|
|
|
vdev->isr |= 0x01;
|
|
virtio_update_irq(vdev);
|
|
}
|
|
|
|
void virtio_notify_config(VirtIODevice *vdev)
|
|
{
|
|
if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK))
|
|
return;
|
|
|
|
vdev->isr |= 0x03;
|
|
virtio_update_irq(vdev);
|
|
}
|
|
|
|
void virtio_save(VirtIODevice *vdev, QEMUFile *f)
|
|
{
|
|
int i;
|
|
|
|
pci_device_save(&vdev->pci_dev, f);
|
|
|
|
qemu_put_be32s(f, &vdev->addr);
|
|
qemu_put_8s(f, &vdev->status);
|
|
qemu_put_8s(f, &vdev->isr);
|
|
qemu_put_be16s(f, &vdev->queue_sel);
|
|
qemu_put_be32s(f, &vdev->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_be32s(f, &vdev->vq[i].pfn);
|
|
qemu_put_be16s(f, &vdev->vq[i].last_avail_idx);
|
|
}
|
|
}
|
|
|
|
void virtio_load(VirtIODevice *vdev, QEMUFile *f)
|
|
{
|
|
int num, i;
|
|
|
|
pci_device_load(&vdev->pci_dev, f);
|
|
|
|
qemu_get_be32s(f, &vdev->addr);
|
|
qemu_get_8s(f, &vdev->status);
|
|
qemu_get_8s(f, &vdev->isr);
|
|
qemu_get_be16s(f, &vdev->queue_sel);
|
|
qemu_get_be32s(f, &vdev->features);
|
|
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);
|
|
qemu_get_be32s(f, &vdev->vq[i].pfn);
|
|
qemu_get_be16s(f, &vdev->vq[i].last_avail_idx);
|
|
|
|
if (vdev->vq[i].pfn) {
|
|
target_phys_addr_t pa;
|
|
|
|
pa = (ram_addr_t)vdev->vq[i].pfn << VIRTIO_PCI_QUEUE_ADDR_SHIFT;
|
|
virtqueue_init(&vdev->vq[i], pa);
|
|
}
|
|
}
|
|
|
|
virtio_update_irq(vdev);
|
|
}
|
|
|
|
void virtio_cleanup(VirtIODevice *vdev)
|
|
{
|
|
if (vdev->config)
|
|
qemu_free(vdev->config);
|
|
qemu_free(vdev->vq);
|
|
}
|
|
|
|
VirtIODevice *virtio_init_pci(PCIDevice *pci_dev, const char *name,
|
|
uint16_t vendor, uint16_t device,
|
|
uint16_t subvendor, uint16_t subdevice,
|
|
uint16_t class_code, uint8_t pif,
|
|
size_t config_size)
|
|
{
|
|
VirtIODevice *vdev;
|
|
uint8_t *config;
|
|
uint32_t size;
|
|
|
|
vdev = to_virtio_device(pci_dev);
|
|
|
|
vdev->status = 0;
|
|
vdev->isr = 0;
|
|
vdev->queue_sel = 0;
|
|
vdev->vq = qemu_mallocz(sizeof(VirtQueue) * VIRTIO_PCI_QUEUE_MAX);
|
|
|
|
config = pci_dev->config;
|
|
pci_config_set_vendor_id(config, vendor);
|
|
pci_config_set_device_id(config, device);
|
|
|
|
config[0x08] = VIRTIO_PCI_ABI_VERSION;
|
|
|
|
config[0x09] = pif;
|
|
pci_config_set_class(config, class_code);
|
|
config[PCI_HEADER_TYPE] = PCI_HEADER_TYPE_NORMAL;
|
|
|
|
config[0x2c] = subvendor & 0xFF;
|
|
config[0x2d] = (subvendor >> 8) & 0xFF;
|
|
config[0x2e] = subdevice & 0xFF;
|
|
config[0x2f] = (subdevice >> 8) & 0xFF;
|
|
|
|
config[0x3d] = 1;
|
|
|
|
vdev->name = name;
|
|
vdev->config_len = config_size;
|
|
if (vdev->config_len)
|
|
vdev->config = qemu_mallocz(config_size);
|
|
else
|
|
vdev->config = NULL;
|
|
|
|
size = 20 + config_size;
|
|
if (size & (size-1))
|
|
size = 1 << qemu_fls(size);
|
|
|
|
pci_register_io_region(pci_dev, 0, size, PCI_ADDRESS_SPACE_IO,
|
|
virtio_map);
|
|
qemu_register_reset(virtio_reset, vdev);
|
|
|
|
return vdev;
|
|
}
|