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https://github.com/torvalds/linux
synced 2024-11-05 18:23:50 +00:00
KVM: remove in_range from io devices
This changes bus accesses to use high-level kvm_io_bus_read/kvm_io_bus_write functions. in_range now becomes unused so it is removed from device ops in favor of read/write callbacks performing range checks internally. This allows aliasing (mostly for in-kernel virtio), as well as better error handling by making it possible to pass errors up to userspace. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Michael S. Tsirkin
Avi Kivity
parent
6c47469453
commit
bda9020e24
10 changed files with 152 additions and 208 deletions
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@ -210,16 +210,6 @@ int kvm_dev_ioctl_check_extension(long ext)
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}
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static struct kvm_io_device *vcpu_find_mmio_dev(struct kvm_vcpu *vcpu,
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gpa_t addr, int len, int is_write)
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{
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struct kvm_io_device *dev;
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dev = kvm_io_bus_find_dev(&vcpu->kvm->mmio_bus, addr, len, is_write);
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return dev;
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}
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static int handle_vm_error(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
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{
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kvm_run->exit_reason = KVM_EXIT_UNKNOWN;
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@ -231,6 +221,7 @@ static int handle_mmio(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
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{
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struct kvm_mmio_req *p;
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struct kvm_io_device *mmio_dev;
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int r;
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p = kvm_get_vcpu_ioreq(vcpu);
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@ -247,16 +238,13 @@ static int handle_mmio(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
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kvm_run->exit_reason = KVM_EXIT_MMIO;
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return 0;
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mmio:
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mmio_dev = vcpu_find_mmio_dev(vcpu, p->addr, p->size, !p->dir);
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if (mmio_dev) {
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if (!p->dir)
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kvm_iodevice_write(mmio_dev, p->addr, p->size,
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&p->data);
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else
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kvm_iodevice_read(mmio_dev, p->addr, p->size,
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&p->data);
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} else
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if (p->dir)
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r = kvm_io_bus_read(&vcpu->kvm->mmio_bus, p->addr,
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p->size, &p->data);
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else
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r = kvm_io_bus_write(&vcpu->kvm->mmio_bus, p->addr,
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p->size, &p->data);
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if (r)
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printk(KERN_ERR"kvm: No iodevice found! addr:%lx\n", p->addr);
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p->state = STATE_IORESP_READY;
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@ -358,8 +358,14 @@ static inline struct kvm_pit *speaker_to_pit(struct kvm_io_device *dev)
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return container_of(dev, struct kvm_pit, speaker_dev);
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}
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static void pit_ioport_write(struct kvm_io_device *this,
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gpa_t addr, int len, const void *data)
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static inline int pit_in_range(gpa_t addr)
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{
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return ((addr >= KVM_PIT_BASE_ADDRESS) &&
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(addr < KVM_PIT_BASE_ADDRESS + KVM_PIT_MEM_LENGTH));
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}
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static int pit_ioport_write(struct kvm_io_device *this,
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gpa_t addr, int len, const void *data)
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{
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struct kvm_pit *pit = dev_to_pit(this);
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struct kvm_kpit_state *pit_state = &pit->pit_state;
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@ -367,6 +373,8 @@ static void pit_ioport_write(struct kvm_io_device *this,
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int channel, access;
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struct kvm_kpit_channel_state *s;
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u32 val = *(u32 *) data;
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if (!pit_in_range(addr))
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return -EOPNOTSUPP;
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val &= 0xff;
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addr &= KVM_PIT_CHANNEL_MASK;
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@ -429,16 +437,19 @@ static void pit_ioport_write(struct kvm_io_device *this,
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}
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mutex_unlock(&pit_state->lock);
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return 0;
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}
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static void pit_ioport_read(struct kvm_io_device *this,
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gpa_t addr, int len, void *data)
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static int pit_ioport_read(struct kvm_io_device *this,
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gpa_t addr, int len, void *data)
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{
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struct kvm_pit *pit = dev_to_pit(this);
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struct kvm_kpit_state *pit_state = &pit->pit_state;
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struct kvm *kvm = pit->kvm;
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int ret, count;
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struct kvm_kpit_channel_state *s;
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if (!pit_in_range(addr))
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return -EOPNOTSUPP;
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addr &= KVM_PIT_CHANNEL_MASK;
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s = &pit_state->channels[addr];
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@ -493,37 +504,36 @@ static void pit_ioport_read(struct kvm_io_device *this,
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memcpy(data, (char *)&ret, len);
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mutex_unlock(&pit_state->lock);
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return 0;
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}
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static int pit_in_range(struct kvm_io_device *this, gpa_t addr,
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int len, int is_write)
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{
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return ((addr >= KVM_PIT_BASE_ADDRESS) &&
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(addr < KVM_PIT_BASE_ADDRESS + KVM_PIT_MEM_LENGTH));
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}
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static void speaker_ioport_write(struct kvm_io_device *this,
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gpa_t addr, int len, const void *data)
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static int speaker_ioport_write(struct kvm_io_device *this,
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gpa_t addr, int len, const void *data)
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{
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struct kvm_pit *pit = speaker_to_pit(this);
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struct kvm_kpit_state *pit_state = &pit->pit_state;
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struct kvm *kvm = pit->kvm;
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u32 val = *(u32 *) data;
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if (addr != KVM_SPEAKER_BASE_ADDRESS)
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return -EOPNOTSUPP;
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mutex_lock(&pit_state->lock);
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pit_state->speaker_data_on = (val >> 1) & 1;
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pit_set_gate(kvm, 2, val & 1);
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mutex_unlock(&pit_state->lock);
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return 0;
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}
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static void speaker_ioport_read(struct kvm_io_device *this,
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gpa_t addr, int len, void *data)
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static int speaker_ioport_read(struct kvm_io_device *this,
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gpa_t addr, int len, void *data)
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{
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struct kvm_pit *pit = speaker_to_pit(this);
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struct kvm_kpit_state *pit_state = &pit->pit_state;
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struct kvm *kvm = pit->kvm;
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unsigned int refresh_clock;
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int ret;
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if (addr != KVM_SPEAKER_BASE_ADDRESS)
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return -EOPNOTSUPP;
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/* Refresh clock toggles at about 15us. We approximate as 2^14ns. */
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refresh_clock = ((unsigned int)ktime_to_ns(ktime_get()) >> 14) & 1;
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@ -535,12 +545,7 @@ static void speaker_ioport_read(struct kvm_io_device *this,
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len = sizeof(ret);
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memcpy(data, (char *)&ret, len);
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mutex_unlock(&pit_state->lock);
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}
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static int speaker_in_range(struct kvm_io_device *this, gpa_t addr,
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int len, int is_write)
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{
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return (addr == KVM_SPEAKER_BASE_ADDRESS);
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return 0;
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}
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void kvm_pit_reset(struct kvm_pit *pit)
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@ -574,13 +579,11 @@ static void pit_mask_notifer(struct kvm_irq_mask_notifier *kimn, bool mask)
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static const struct kvm_io_device_ops pit_dev_ops = {
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.read = pit_ioport_read,
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.write = pit_ioport_write,
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.in_range = pit_in_range,
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};
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static const struct kvm_io_device_ops speaker_dev_ops = {
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.read = speaker_ioport_read,
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.write = speaker_ioport_write,
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.in_range = speaker_in_range,
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};
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/* Caller must have writers lock on slots_lock */
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@ -430,8 +430,7 @@ static u32 elcr_ioport_read(void *opaque, u32 addr1)
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return s->elcr;
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}
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static int picdev_in_range(struct kvm_io_device *this, gpa_t addr,
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int len, int is_write)
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static int picdev_in_range(gpa_t addr)
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{
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switch (addr) {
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case 0x20:
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@ -451,16 +450,18 @@ static inline struct kvm_pic *to_pic(struct kvm_io_device *dev)
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return container_of(dev, struct kvm_pic, dev);
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}
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static void picdev_write(struct kvm_io_device *this,
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static int picdev_write(struct kvm_io_device *this,
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gpa_t addr, int len, const void *val)
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{
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struct kvm_pic *s = to_pic(this);
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unsigned char data = *(unsigned char *)val;
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if (!picdev_in_range(addr))
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return -EOPNOTSUPP;
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if (len != 1) {
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if (printk_ratelimit())
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printk(KERN_ERR "PIC: non byte write\n");
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return;
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return 0;
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}
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pic_lock(s);
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switch (addr) {
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@ -476,18 +477,21 @@ static void picdev_write(struct kvm_io_device *this,
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break;
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}
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pic_unlock(s);
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return 0;
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}
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static void picdev_read(struct kvm_io_device *this,
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gpa_t addr, int len, void *val)
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static int picdev_read(struct kvm_io_device *this,
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gpa_t addr, int len, void *val)
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{
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struct kvm_pic *s = to_pic(this);
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unsigned char data = 0;
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if (!picdev_in_range(addr))
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return -EOPNOTSUPP;
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if (len != 1) {
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if (printk_ratelimit())
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printk(KERN_ERR "PIC: non byte read\n");
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return;
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return 0;
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}
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pic_lock(s);
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switch (addr) {
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@ -504,6 +508,7 @@ static void picdev_read(struct kvm_io_device *this,
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}
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*(unsigned char *)val = data;
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pic_unlock(s);
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return 0;
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}
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/*
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@ -526,7 +531,6 @@ static void pic_irq_request(void *opaque, int level)
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static const struct kvm_io_device_ops picdev_ops = {
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.read = picdev_read,
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.write = picdev_write,
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.in_range = picdev_in_range,
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};
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struct kvm_pic *kvm_create_pic(struct kvm *kvm)
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@ -546,18 +546,27 @@ static inline struct kvm_lapic *to_lapic(struct kvm_io_device *dev)
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return container_of(dev, struct kvm_lapic, dev);
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}
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static void apic_mmio_read(struct kvm_io_device *this,
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gpa_t address, int len, void *data)
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static int apic_mmio_in_range(struct kvm_lapic *apic, gpa_t addr)
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{
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return apic_hw_enabled(apic) &&
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addr >= apic->base_address &&
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addr < apic->base_address + LAPIC_MMIO_LENGTH;
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}
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static int apic_mmio_read(struct kvm_io_device *this,
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gpa_t address, int len, void *data)
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{
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struct kvm_lapic *apic = to_lapic(this);
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unsigned int offset = address - apic->base_address;
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unsigned char alignment = offset & 0xf;
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u32 result;
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if (!apic_mmio_in_range(apic, address))
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return -EOPNOTSUPP;
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if ((alignment + len) > 4) {
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printk(KERN_ERR "KVM_APIC_READ: alignment error %lx %d",
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(unsigned long)address, len);
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return;
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return 0;
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}
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result = __apic_read(apic, offset & ~0xf);
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@ -574,6 +583,7 @@ static void apic_mmio_read(struct kvm_io_device *this,
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"should be 1,2, or 4 instead\n", len);
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break;
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}
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return 0;
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}
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static void update_divide_count(struct kvm_lapic *apic)
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@ -629,13 +639,15 @@ static void apic_manage_nmi_watchdog(struct kvm_lapic *apic, u32 lvt0_val)
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apic->vcpu->kvm->arch.vapics_in_nmi_mode--;
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}
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static void apic_mmio_write(struct kvm_io_device *this,
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gpa_t address, int len, const void *data)
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static int apic_mmio_write(struct kvm_io_device *this,
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gpa_t address, int len, const void *data)
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{
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struct kvm_lapic *apic = to_lapic(this);
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unsigned int offset = address - apic->base_address;
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unsigned char alignment = offset & 0xf;
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u32 val;
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if (!apic_mmio_in_range(apic, address))
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return -EOPNOTSUPP;
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/*
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* APIC register must be aligned on 128-bits boundary.
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@ -646,7 +658,7 @@ static void apic_mmio_write(struct kvm_io_device *this,
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/* Don't shout loud, $infamous_os would cause only noise. */
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apic_debug("apic write: bad size=%d %lx\n",
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len, (long)address);
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return;
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return 0;
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}
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val = *(u32 *) data;
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@ -729,7 +741,7 @@ static void apic_mmio_write(struct kvm_io_device *this,
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hrtimer_cancel(&apic->lapic_timer.timer);
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apic_set_reg(apic, APIC_TMICT, val);
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start_apic_timer(apic);
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return;
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return 0;
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case APIC_TDCR:
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if (val & 4)
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@ -743,22 +755,7 @@ static void apic_mmio_write(struct kvm_io_device *this,
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offset);
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break;
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}
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}
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static int apic_mmio_range(struct kvm_io_device *this, gpa_t addr,
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int len, int size)
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{
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struct kvm_lapic *apic = to_lapic(this);
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int ret = 0;
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if (apic_hw_enabled(apic) &&
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(addr >= apic->base_address) &&
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(addr < (apic->base_address + LAPIC_MMIO_LENGTH)))
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ret = 1;
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return ret;
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return 0;
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}
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void kvm_free_lapic(struct kvm_vcpu *vcpu)
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@ -938,7 +935,6 @@ static struct kvm_timer_ops lapic_timer_ops = {
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static const struct kvm_io_device_ops apic_mmio_ops = {
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.read = apic_mmio_read,
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.write = apic_mmio_write,
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.in_range = apic_mmio_range,
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};
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int kvm_create_lapic(struct kvm_vcpu *vcpu)
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@ -2333,35 +2333,23 @@ static void kvm_init_msr_list(void)
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num_msrs_to_save = j;
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}
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/*
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* Only apic need an MMIO device hook, so shortcut now..
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*/
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static struct kvm_io_device *vcpu_find_pervcpu_dev(struct kvm_vcpu *vcpu,
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gpa_t addr, int len,
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int is_write)
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static int vcpu_mmio_write(struct kvm_vcpu *vcpu, gpa_t addr, int len,
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const void *v)
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{
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struct kvm_io_device *dev;
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if (vcpu->arch.apic &&
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!kvm_iodevice_write(&vcpu->arch.apic->dev, addr, len, v))
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return 0;
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if (vcpu->arch.apic) {
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dev = &vcpu->arch.apic->dev;
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if (kvm_iodevice_in_range(dev, addr, len, is_write))
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return dev;
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}
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return NULL;
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return kvm_io_bus_write(&vcpu->kvm->mmio_bus, addr, len, v);
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}
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static struct kvm_io_device *vcpu_find_mmio_dev(struct kvm_vcpu *vcpu,
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gpa_t addr, int len,
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int is_write)
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static int vcpu_mmio_read(struct kvm_vcpu *vcpu, gpa_t addr, int len, void *v)
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{
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struct kvm_io_device *dev;
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if (vcpu->arch.apic &&
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!kvm_iodevice_read(&vcpu->arch.apic->dev, addr, len, v))
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return 0;
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dev = vcpu_find_pervcpu_dev(vcpu, addr, len, is_write);
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if (dev == NULL)
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dev = kvm_io_bus_find_dev(&vcpu->kvm->mmio_bus, addr, len,
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is_write);
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return dev;
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return kvm_io_bus_read(&vcpu->kvm->mmio_bus, addr, len, v);
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}
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static int kvm_read_guest_virt(gva_t addr, void *val, unsigned int bytes,
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@ -2430,7 +2418,6 @@ static int emulator_read_emulated(unsigned long addr,
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unsigned int bytes,
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struct kvm_vcpu *vcpu)
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{
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struct kvm_io_device *mmio_dev;
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gpa_t gpa;
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if (vcpu->mmio_read_completed) {
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@ -2455,13 +2442,8 @@ static int emulator_read_emulated(unsigned long addr,
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/*
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* Is this MMIO handled locally?
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*/
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mutex_lock(&vcpu->kvm->lock);
|
||||
mmio_dev = vcpu_find_mmio_dev(vcpu, gpa, bytes, 0);
|
||||
mutex_unlock(&vcpu->kvm->lock);
|
||||
if (mmio_dev) {
|
||||
kvm_iodevice_read(mmio_dev, gpa, bytes, val);
|
||||
if (!vcpu_mmio_read(vcpu, gpa, bytes, val))
|
||||
return X86EMUL_CONTINUE;
|
||||
}
|
||||
|
||||
vcpu->mmio_needed = 1;
|
||||
vcpu->mmio_phys_addr = gpa;
|
||||
|
|
@ -2488,7 +2470,6 @@ static int emulator_write_emulated_onepage(unsigned long addr,
|
|||
unsigned int bytes,
|
||||
struct kvm_vcpu *vcpu)
|
||||
{
|
||||
struct kvm_io_device *mmio_dev;
|
||||
gpa_t gpa;
|
||||
|
||||
gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, addr);
|
||||
|
|
@ -2509,13 +2490,8 @@ static int emulator_write_emulated_onepage(unsigned long addr,
|
|||
/*
|
||||
* Is this MMIO handled locally?
|
||||
*/
|
||||
mutex_lock(&vcpu->kvm->lock);
|
||||
mmio_dev = vcpu_find_mmio_dev(vcpu, gpa, bytes, 1);
|
||||
mutex_unlock(&vcpu->kvm->lock);
|
||||
if (mmio_dev) {
|
||||
kvm_iodevice_write(mmio_dev, gpa, bytes, val);
|
||||
if (!vcpu_mmio_write(vcpu, gpa, bytes, val))
|
||||
return X86EMUL_CONTINUE;
|
||||
}
|
||||
|
||||
vcpu->mmio_needed = 1;
|
||||
vcpu->mmio_phys_addr = gpa;
|
||||
|
|
@ -2850,48 +2826,40 @@ int complete_pio(struct kvm_vcpu *vcpu)
|
|||
return 0;
|
||||
}
|
||||
|
||||
static void kernel_pio(struct kvm_io_device *pio_dev,
|
||||
struct kvm_vcpu *vcpu,
|
||||
void *pd)
|
||||
static int kernel_pio(struct kvm_vcpu *vcpu, void *pd)
|
||||
{
|
||||
/* TODO: String I/O for in kernel device */
|
||||
int r;
|
||||
|
||||
if (vcpu->arch.pio.in)
|
||||
kvm_iodevice_read(pio_dev, vcpu->arch.pio.port,
|
||||
vcpu->arch.pio.size,
|
||||
pd);
|
||||
r = kvm_io_bus_read(&vcpu->kvm->pio_bus, vcpu->arch.pio.port,
|
||||
vcpu->arch.pio.size, pd);
|
||||
else
|
||||
kvm_iodevice_write(pio_dev, vcpu->arch.pio.port,
|
||||
vcpu->arch.pio.size,
|
||||
pd);
|
||||
r = kvm_io_bus_write(&vcpu->kvm->pio_bus, vcpu->arch.pio.port,
|
||||
vcpu->arch.pio.size, pd);
|
||||
return r;
|
||||
}
|
||||
|
||||
static void pio_string_write(struct kvm_io_device *pio_dev,
|
||||
struct kvm_vcpu *vcpu)
|
||||
static int pio_string_write(struct kvm_vcpu *vcpu)
|
||||
{
|
||||
struct kvm_pio_request *io = &vcpu->arch.pio;
|
||||
void *pd = vcpu->arch.pio_data;
|
||||
int i;
|
||||
int i, r = 0;
|
||||
|
||||
for (i = 0; i < io->cur_count; i++) {
|
||||
kvm_iodevice_write(pio_dev, io->port,
|
||||
io->size,
|
||||
pd);
|
||||
if (kvm_io_bus_write(&vcpu->kvm->pio_bus,
|
||||
io->port, io->size, pd)) {
|
||||
r = -EOPNOTSUPP;
|
||||
break;
|
||||
}
|
||||
pd += io->size;
|
||||
}
|
||||
}
|
||||
|
||||
static struct kvm_io_device *vcpu_find_pio_dev(struct kvm_vcpu *vcpu,
|
||||
gpa_t addr, int len,
|
||||
int is_write)
|
||||
{
|
||||
return kvm_io_bus_find_dev(&vcpu->kvm->pio_bus, addr, len, is_write);
|
||||
return r;
|
||||
}
|
||||
|
||||
int kvm_emulate_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
|
||||
int size, unsigned port)
|
||||
{
|
||||
struct kvm_io_device *pio_dev;
|
||||
unsigned long val;
|
||||
|
||||
vcpu->run->exit_reason = KVM_EXIT_IO;
|
||||
|
|
@ -2911,11 +2879,7 @@ int kvm_emulate_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
|
|||
val = kvm_register_read(vcpu, VCPU_REGS_RAX);
|
||||
memcpy(vcpu->arch.pio_data, &val, 4);
|
||||
|
||||
mutex_lock(&vcpu->kvm->lock);
|
||||
pio_dev = vcpu_find_pio_dev(vcpu, port, size, !in);
|
||||
mutex_unlock(&vcpu->kvm->lock);
|
||||
if (pio_dev) {
|
||||
kernel_pio(pio_dev, vcpu, vcpu->arch.pio_data);
|
||||
if (!kernel_pio(vcpu, vcpu->arch.pio_data)) {
|
||||
complete_pio(vcpu);
|
||||
return 1;
|
||||
}
|
||||
|
|
@ -2929,7 +2893,6 @@ int kvm_emulate_pio_string(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
|
|||
{
|
||||
unsigned now, in_page;
|
||||
int ret = 0;
|
||||
struct kvm_io_device *pio_dev;
|
||||
|
||||
vcpu->run->exit_reason = KVM_EXIT_IO;
|
||||
vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT;
|
||||
|
|
@ -2973,12 +2936,6 @@ int kvm_emulate_pio_string(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
|
|||
|
||||
vcpu->arch.pio.guest_gva = address;
|
||||
|
||||
mutex_lock(&vcpu->kvm->lock);
|
||||
pio_dev = vcpu_find_pio_dev(vcpu, port,
|
||||
vcpu->arch.pio.cur_count,
|
||||
!vcpu->arch.pio.in);
|
||||
mutex_unlock(&vcpu->kvm->lock);
|
||||
|
||||
if (!vcpu->arch.pio.in) {
|
||||
/* string PIO write */
|
||||
ret = pio_copy_data(vcpu);
|
||||
|
|
@ -2986,16 +2943,13 @@ int kvm_emulate_pio_string(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
|
|||
kvm_inject_gp(vcpu, 0);
|
||||
return 1;
|
||||
}
|
||||
if (ret == 0 && pio_dev) {
|
||||
pio_string_write(pio_dev, vcpu);
|
||||
if (ret == 0 && !pio_string_write(vcpu)) {
|
||||
complete_pio(vcpu);
|
||||
if (vcpu->arch.pio.count == 0)
|
||||
ret = 1;
|
||||
}
|
||||
} else if (pio_dev)
|
||||
pr_unimpl(vcpu, "no string pio read support yet, "
|
||||
"port %x size %d count %ld\n",
|
||||
port, size, count);
|
||||
}
|
||||
/* no string PIO read support yet */
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -60,8 +60,10 @@ struct kvm_io_bus {
|
|||
|
||||
void kvm_io_bus_init(struct kvm_io_bus *bus);
|
||||
void kvm_io_bus_destroy(struct kvm_io_bus *bus);
|
||||
struct kvm_io_device *kvm_io_bus_find_dev(struct kvm_io_bus *bus,
|
||||
gpa_t addr, int len, int is_write);
|
||||
int kvm_io_bus_write(struct kvm_io_bus *bus, gpa_t addr, int len,
|
||||
const void *val);
|
||||
int kvm_io_bus_read(struct kvm_io_bus *bus, gpa_t addr, int len,
|
||||
void *val);
|
||||
void __kvm_io_bus_register_dev(struct kvm_io_bus *bus,
|
||||
struct kvm_io_device *dev);
|
||||
void kvm_io_bus_register_dev(struct kvm *kvm, struct kvm_io_bus *bus,
|
||||
|
|
|
|||
|
|
@ -19,18 +19,14 @@ static inline struct kvm_coalesced_mmio_dev *to_mmio(struct kvm_io_device *dev)
|
|||
return container_of(dev, struct kvm_coalesced_mmio_dev, dev);
|
||||
}
|
||||
|
||||
static int coalesced_mmio_in_range(struct kvm_io_device *this,
|
||||
gpa_t addr, int len, int is_write)
|
||||
static int coalesced_mmio_in_range(struct kvm_coalesced_mmio_dev *dev,
|
||||
gpa_t addr, int len)
|
||||
{
|
||||
struct kvm_coalesced_mmio_dev *dev = to_mmio(this);
|
||||
struct kvm_coalesced_mmio_zone *zone;
|
||||
struct kvm_coalesced_mmio_ring *ring;
|
||||
unsigned avail;
|
||||
int i;
|
||||
|
||||
if (!is_write)
|
||||
return 0;
|
||||
|
||||
/* Are we able to batch it ? */
|
||||
|
||||
/* last is the first free entry
|
||||
|
|
@ -60,11 +56,13 @@ static int coalesced_mmio_in_range(struct kvm_io_device *this,
|
|||
return 0;
|
||||
}
|
||||
|
||||
static void coalesced_mmio_write(struct kvm_io_device *this,
|
||||
gpa_t addr, int len, const void *val)
|
||||
static int coalesced_mmio_write(struct kvm_io_device *this,
|
||||
gpa_t addr, int len, const void *val)
|
||||
{
|
||||
struct kvm_coalesced_mmio_dev *dev = to_mmio(this);
|
||||
struct kvm_coalesced_mmio_ring *ring = dev->kvm->coalesced_mmio_ring;
|
||||
if (!coalesced_mmio_in_range(dev, addr, len))
|
||||
return -EOPNOTSUPP;
|
||||
|
||||
spin_lock(&dev->lock);
|
||||
|
||||
|
|
@ -76,6 +74,7 @@ static void coalesced_mmio_write(struct kvm_io_device *this,
|
|||
smp_wmb();
|
||||
ring->last = (ring->last + 1) % KVM_COALESCED_MMIO_MAX;
|
||||
spin_unlock(&dev->lock);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void coalesced_mmio_destructor(struct kvm_io_device *this)
|
||||
|
|
@ -87,7 +86,6 @@ static void coalesced_mmio_destructor(struct kvm_io_device *this)
|
|||
|
||||
static const struct kvm_io_device_ops coalesced_mmio_ops = {
|
||||
.write = coalesced_mmio_write,
|
||||
.in_range = coalesced_mmio_in_range,
|
||||
.destructor = coalesced_mmio_destructor,
|
||||
};
|
||||
|
||||
|
|
|
|||
|
|
@ -227,20 +227,19 @@ static inline struct kvm_ioapic *to_ioapic(struct kvm_io_device *dev)
|
|||
return container_of(dev, struct kvm_ioapic, dev);
|
||||
}
|
||||
|
||||
static int ioapic_in_range(struct kvm_io_device *this, gpa_t addr,
|
||||
int len, int is_write)
|
||||
static inline int ioapic_in_range(struct kvm_ioapic *ioapic, gpa_t addr)
|
||||
{
|
||||
struct kvm_ioapic *ioapic = to_ioapic(this);
|
||||
|
||||
return ((addr >= ioapic->base_address &&
|
||||
(addr < ioapic->base_address + IOAPIC_MEM_LENGTH)));
|
||||
}
|
||||
|
||||
static void ioapic_mmio_read(struct kvm_io_device *this, gpa_t addr, int len,
|
||||
void *val)
|
||||
static int ioapic_mmio_read(struct kvm_io_device *this, gpa_t addr, int len,
|
||||
void *val)
|
||||
{
|
||||
struct kvm_ioapic *ioapic = to_ioapic(this);
|
||||
u32 result;
|
||||
if (!ioapic_in_range(ioapic, addr))
|
||||
return -EOPNOTSUPP;
|
||||
|
||||
ioapic_debug("addr %lx\n", (unsigned long)addr);
|
||||
ASSERT(!(addr & 0xf)); /* check alignment */
|
||||
|
|
@ -273,13 +272,16 @@ static void ioapic_mmio_read(struct kvm_io_device *this, gpa_t addr, int len,
|
|||
printk(KERN_WARNING "ioapic: wrong length %d\n", len);
|
||||
}
|
||||
mutex_unlock(&ioapic->kvm->irq_lock);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void ioapic_mmio_write(struct kvm_io_device *this, gpa_t addr, int len,
|
||||
const void *val)
|
||||
static int ioapic_mmio_write(struct kvm_io_device *this, gpa_t addr, int len,
|
||||
const void *val)
|
||||
{
|
||||
struct kvm_ioapic *ioapic = to_ioapic(this);
|
||||
u32 data;
|
||||
if (!ioapic_in_range(ioapic, addr))
|
||||
return -EOPNOTSUPP;
|
||||
|
||||
ioapic_debug("ioapic_mmio_write addr=%p len=%d val=%p\n",
|
||||
(void*)addr, len, val);
|
||||
|
|
@ -290,7 +292,7 @@ static void ioapic_mmio_write(struct kvm_io_device *this, gpa_t addr, int len,
|
|||
data = *(u32 *) val;
|
||||
else {
|
||||
printk(KERN_WARNING "ioapic: Unsupported size %d\n", len);
|
||||
return;
|
||||
return 0;
|
||||
}
|
||||
|
||||
addr &= 0xff;
|
||||
|
|
@ -312,6 +314,7 @@ static void ioapic_mmio_write(struct kvm_io_device *this, gpa_t addr, int len,
|
|||
break;
|
||||
}
|
||||
mutex_unlock(&ioapic->kvm->irq_lock);
|
||||
return 0;
|
||||
}
|
||||
|
||||
void kvm_ioapic_reset(struct kvm_ioapic *ioapic)
|
||||
|
|
@ -329,7 +332,6 @@ void kvm_ioapic_reset(struct kvm_ioapic *ioapic)
|
|||
static const struct kvm_io_device_ops ioapic_mmio_ops = {
|
||||
.read = ioapic_mmio_read,
|
||||
.write = ioapic_mmio_write,
|
||||
.in_range = ioapic_in_range,
|
||||
};
|
||||
|
||||
int kvm_ioapic_init(struct kvm *kvm)
|
||||
|
|
|
|||
|
|
@ -17,23 +17,24 @@
|
|||
#define __KVM_IODEV_H__
|
||||
|
||||
#include <linux/kvm_types.h>
|
||||
#include <asm/errno.h>
|
||||
|
||||
struct kvm_io_device;
|
||||
|
||||
/**
|
||||
* kvm_io_device_ops are called under kvm slots_lock.
|
||||
* read and write handlers return 0 if the transaction has been handled,
|
||||
* or non-zero to have it passed to the next device.
|
||||
**/
|
||||
struct kvm_io_device_ops {
|
||||
void (*read)(struct kvm_io_device *this,
|
||||
int (*read)(struct kvm_io_device *this,
|
||||
gpa_t addr,
|
||||
int len,
|
||||
void *val);
|
||||
int (*write)(struct kvm_io_device *this,
|
||||
gpa_t addr,
|
||||
int len,
|
||||
void *val);
|
||||
void (*write)(struct kvm_io_device *this,
|
||||
gpa_t addr,
|
||||
int len,
|
||||
const void *val);
|
||||
int (*in_range)(struct kvm_io_device *this, gpa_t addr, int len,
|
||||
int is_write);
|
||||
const void *val);
|
||||
void (*destructor)(struct kvm_io_device *this);
|
||||
};
|
||||
|
||||
|
|
@ -48,26 +49,16 @@ static inline void kvm_iodevice_init(struct kvm_io_device *dev,
|
|||
dev->ops = ops;
|
||||
}
|
||||
|
||||
static inline void kvm_iodevice_read(struct kvm_io_device *dev,
|
||||
gpa_t addr,
|
||||
int len,
|
||||
void *val)
|
||||
static inline int kvm_iodevice_read(struct kvm_io_device *dev,
|
||||
gpa_t addr, int l, void *v)
|
||||
{
|
||||
dev->ops->read(dev, addr, len, val);
|
||||
return dev->ops->read ? dev->ops->read(dev, addr, l, v) : -EOPNOTSUPP;
|
||||
}
|
||||
|
||||
static inline void kvm_iodevice_write(struct kvm_io_device *dev,
|
||||
gpa_t addr,
|
||||
int len,
|
||||
const void *val)
|
||||
static inline int kvm_iodevice_write(struct kvm_io_device *dev,
|
||||
gpa_t addr, int l, const void *v)
|
||||
{
|
||||
dev->ops->write(dev, addr, len, val);
|
||||
}
|
||||
|
||||
static inline int kvm_iodevice_in_range(struct kvm_io_device *dev,
|
||||
gpa_t addr, int len, int is_write)
|
||||
{
|
||||
return dev->ops->in_range(dev, addr, len, is_write);
|
||||
return dev->ops->write ? dev->ops->write(dev, addr, l, v) : -EOPNOTSUPP;
|
||||
}
|
||||
|
||||
static inline void kvm_iodevice_destructor(struct kvm_io_device *dev)
|
||||
|
|
|
|||
|
|
@ -2512,19 +2512,25 @@ void kvm_io_bus_destroy(struct kvm_io_bus *bus)
|
|||
}
|
||||
}
|
||||
|
||||
struct kvm_io_device *kvm_io_bus_find_dev(struct kvm_io_bus *bus,
|
||||
gpa_t addr, int len, int is_write)
|
||||
/* kvm_io_bus_write - called under kvm->slots_lock */
|
||||
int kvm_io_bus_write(struct kvm_io_bus *bus, gpa_t addr,
|
||||
int len, const void *val)
|
||||
{
|
||||
int i;
|
||||
for (i = 0; i < bus->dev_count; i++)
|
||||
if (!kvm_iodevice_write(bus->devs[i], addr, len, val))
|
||||
return 0;
|
||||
return -EOPNOTSUPP;
|
||||
}
|
||||
|
||||
for (i = 0; i < bus->dev_count; i++) {
|
||||
struct kvm_io_device *pos = bus->devs[i];
|
||||
|
||||
if (kvm_iodevice_in_range(pos, addr, len, is_write))
|
||||
return pos;
|
||||
}
|
||||
|
||||
return NULL;
|
||||
/* kvm_io_bus_read - called under kvm->slots_lock */
|
||||
int kvm_io_bus_read(struct kvm_io_bus *bus, gpa_t addr, int len, void *val)
|
||||
{
|
||||
int i;
|
||||
for (i = 0; i < bus->dev_count; i++)
|
||||
if (!kvm_iodevice_read(bus->devs[i], addr, len, val))
|
||||
return 0;
|
||||
return -EOPNOTSUPP;
|
||||
}
|
||||
|
||||
void kvm_io_bus_register_dev(struct kvm *kvm, struct kvm_io_bus *bus,
|
||||
|
|
|
|||
Loading…
Reference in a new issue