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-rw-r--r--hw/misc/vfio.c338
1 files changed, 300 insertions, 38 deletions
diff --git a/hw/misc/vfio.c b/hw/misc/vfio.c
index a73e7f568c..0c9bb95815 100644
--- a/hw/misc/vfio.c
+++ b/hw/misc/vfio.c
@@ -188,6 +188,7 @@ typedef struct VFIODevice {
bool pci_aer;
bool has_flr;
bool has_pm_reset;
+ bool needs_reset;
} VFIODevice;
typedef struct VFIOGroup {
@@ -2758,6 +2759,279 @@ static int vfio_add_capabilities(VFIODevice *vdev)
return vfio_add_std_cap(vdev, pdev->config[PCI_CAPABILITY_LIST]);
}
+static void vfio_pci_pre_reset(VFIODevice *vdev)
+{
+ PCIDevice *pdev = &vdev->pdev;
+ uint16_t cmd;
+
+ vfio_disable_interrupts(vdev);
+
+ /* Make sure the device is in D0 */
+ if (vdev->pm_cap) {
+ uint16_t pmcsr;
+ uint8_t state;
+
+ pmcsr = vfio_pci_read_config(pdev, vdev->pm_cap + PCI_PM_CTRL, 2);
+ state = pmcsr & PCI_PM_CTRL_STATE_MASK;
+ if (state) {
+ pmcsr &= ~PCI_PM_CTRL_STATE_MASK;
+ vfio_pci_write_config(pdev, vdev->pm_cap + PCI_PM_CTRL, pmcsr, 2);
+ /* vfio handles the necessary delay here */
+ pmcsr = vfio_pci_read_config(pdev, vdev->pm_cap + PCI_PM_CTRL, 2);
+ state = pmcsr & PCI_PM_CTRL_STATE_MASK;
+ if (state) {
+ error_report("vfio: Unable to power on device, stuck in D%d\n",
+ state);
+ }
+ }
+ }
+
+ /*
+ * Stop any ongoing DMA by disconecting I/O, MMIO, and bus master.
+ * Also put INTx Disable in known state.
+ */
+ cmd = vfio_pci_read_config(pdev, PCI_COMMAND, 2);
+ cmd &= ~(PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER |
+ PCI_COMMAND_INTX_DISABLE);
+ vfio_pci_write_config(pdev, PCI_COMMAND, cmd, 2);
+}
+
+static void vfio_pci_post_reset(VFIODevice *vdev)
+{
+ vfio_enable_intx(vdev);
+}
+
+static bool vfio_pci_host_match(PCIHostDeviceAddress *host1,
+ PCIHostDeviceAddress *host2)
+{
+ return (host1->domain == host2->domain && host1->bus == host2->bus &&
+ host1->slot == host2->slot && host1->function == host2->function);
+}
+
+static int vfio_pci_hot_reset(VFIODevice *vdev, bool single)
+{
+ VFIOGroup *group;
+ struct vfio_pci_hot_reset_info *info;
+ struct vfio_pci_dependent_device *devices;
+ struct vfio_pci_hot_reset *reset;
+ int32_t *fds;
+ int ret, i, count;
+ bool multi = false;
+
+ DPRINTF("%s(%04x:%02x:%02x.%x) %s\n", __func__, vdev->host.domain,
+ vdev->host.bus, vdev->host.slot, vdev->host.function,
+ single ? "one" : "multi");
+
+ vfio_pci_pre_reset(vdev);
+ vdev->needs_reset = false;
+
+ info = g_malloc0(sizeof(*info));
+ info->argsz = sizeof(*info);
+
+ ret = ioctl(vdev->fd, VFIO_DEVICE_GET_PCI_HOT_RESET_INFO, info);
+ if (ret && errno != ENOSPC) {
+ ret = -errno;
+ if (!vdev->has_pm_reset) {
+ error_report("vfio: Cannot reset device %04x:%02x:%02x.%x, "
+ "no available reset mechanism.", vdev->host.domain,
+ vdev->host.bus, vdev->host.slot, vdev->host.function);
+ }
+ goto out_single;
+ }
+
+ count = info->count;
+ info = g_realloc(info, sizeof(*info) + (count * sizeof(*devices)));
+ info->argsz = sizeof(*info) + (count * sizeof(*devices));
+ devices = &info->devices[0];
+
+ ret = ioctl(vdev->fd, VFIO_DEVICE_GET_PCI_HOT_RESET_INFO, info);
+ if (ret) {
+ ret = -errno;
+ error_report("vfio: hot reset info failed: %m");
+ goto out_single;
+ }
+
+ DPRINTF("%04x:%02x:%02x.%x: hot reset dependent devices:\n",
+ vdev->host.domain, vdev->host.bus, vdev->host.slot,
+ vdev->host.function);
+
+ /* Verify that we have all the groups required */
+ for (i = 0; i < info->count; i++) {
+ PCIHostDeviceAddress host;
+ VFIODevice *tmp;
+
+ host.domain = devices[i].segment;
+ host.bus = devices[i].bus;
+ host.slot = PCI_SLOT(devices[i].devfn);
+ host.function = PCI_FUNC(devices[i].devfn);
+
+ DPRINTF("\t%04x:%02x:%02x.%x group %d\n", host.domain,
+ host.bus, host.slot, host.function, devices[i].group_id);
+
+ if (vfio_pci_host_match(&host, &vdev->host)) {
+ continue;
+ }
+
+ QLIST_FOREACH(group, &group_list, next) {
+ if (group->groupid == devices[i].group_id) {
+ break;
+ }
+ }
+
+ if (!group) {
+ if (!vdev->has_pm_reset) {
+ error_report("vfio: Cannot reset device %04x:%02x:%02x.%x, "
+ "depends on group %d which is not owned.",
+ vdev->host.domain, vdev->host.bus, vdev->host.slot,
+ vdev->host.function, devices[i].group_id);
+ }
+ ret = -EPERM;
+ goto out;
+ }
+
+ /* Prep dependent devices for reset and clear our marker. */
+ QLIST_FOREACH(tmp, &group->device_list, next) {
+ if (vfio_pci_host_match(&host, &tmp->host)) {
+ if (single) {
+ DPRINTF("vfio: found another in-use device "
+ "%04x:%02x:%02x.%x\n", host.domain, host.bus,
+ host.slot, host.function);
+ ret = -EINVAL;
+ goto out_single;
+ }
+ vfio_pci_pre_reset(tmp);
+ tmp->needs_reset = false;
+ multi = true;
+ break;
+ }
+ }
+ }
+
+ if (!single && !multi) {
+ DPRINTF("vfio: No other in-use devices for multi hot reset\n");
+ ret = -EINVAL;
+ goto out_single;
+ }
+
+ /* Determine how many group fds need to be passed */
+ count = 0;
+ QLIST_FOREACH(group, &group_list, next) {
+ for (i = 0; i < info->count; i++) {
+ if (group->groupid == devices[i].group_id) {
+ count++;
+ break;
+ }
+ }
+ }
+
+ reset = g_malloc0(sizeof(*reset) + (count * sizeof(*fds)));
+ reset->argsz = sizeof(*reset) + (count * sizeof(*fds));
+ fds = &reset->group_fds[0];
+
+ /* Fill in group fds */
+ QLIST_FOREACH(group, &group_list, next) {
+ for (i = 0; i < info->count; i++) {
+ if (group->groupid == devices[i].group_id) {
+ fds[reset->count++] = group->fd;
+ break;
+ }
+ }
+ }
+
+ /* Bus reset! */
+ ret = ioctl(vdev->fd, VFIO_DEVICE_PCI_HOT_RESET, reset);
+ g_free(reset);
+
+ DPRINTF("%04x:%02x:%02x.%x hot reset: %s\n", vdev->host.domain,
+ vdev->host.bus, vdev->host.slot, vdev->host.function,
+ ret ? "%m" : "Success");
+
+out:
+ /* Re-enable INTx on affected devices */
+ for (i = 0; i < info->count; i++) {
+ PCIHostDeviceAddress host;
+ VFIODevice *tmp;
+
+ host.domain = devices[i].segment;
+ host.bus = devices[i].bus;
+ host.slot = PCI_SLOT(devices[i].devfn);
+ host.function = PCI_FUNC(devices[i].devfn);
+
+ if (vfio_pci_host_match(&host, &vdev->host)) {
+ continue;
+ }
+
+ QLIST_FOREACH(group, &group_list, next) {
+ if (group->groupid == devices[i].group_id) {
+ break;
+ }
+ }
+
+ if (!group) {
+ break;
+ }
+
+ QLIST_FOREACH(tmp, &group->device_list, next) {
+ if (vfio_pci_host_match(&host, &tmp->host)) {
+ vfio_pci_post_reset(tmp);
+ break;
+ }
+ }
+ }
+out_single:
+ vfio_pci_post_reset(vdev);
+ g_free(info);
+
+ return ret;
+}
+
+/*
+ * We want to differentiate hot reset of mulitple in-use devices vs hot reset
+ * of a single in-use device. VFIO_DEVICE_RESET will already handle the case
+ * of doing hot resets when there is only a single device per bus. The in-use
+ * here refers to how many VFIODevices are affected. A hot reset that affects
+ * multiple devices, but only a single in-use device, means that we can call
+ * it from our bus ->reset() callback since the extent is effectively a single
+ * device. This allows us to make use of it in the hotplug path. When there
+ * are multiple in-use devices, we can only trigger the hot reset during a
+ * system reset and thus from our reset handler. We separate _one vs _multi
+ * here so that we don't overlap and do a double reset on the system reset
+ * path where both our reset handler and ->reset() callback are used. Calling
+ * _one() will only do a hot reset for the one in-use devices case, calling
+ * _multi() will do nothing if a _one() would have been sufficient.
+ */
+static int vfio_pci_hot_reset_one(VFIODevice *vdev)
+{
+ return vfio_pci_hot_reset(vdev, true);
+}
+
+static int vfio_pci_hot_reset_multi(VFIODevice *vdev)
+{
+ return vfio_pci_hot_reset(vdev, false);
+}
+
+static void vfio_pci_reset_handler(void *opaque)
+{
+ VFIOGroup *group;
+ VFIODevice *vdev;
+
+ QLIST_FOREACH(group, &group_list, next) {
+ QLIST_FOREACH(vdev, &group->device_list, next) {
+ if (!vdev->reset_works || (!vdev->has_flr && vdev->has_pm_reset)) {
+ vdev->needs_reset = true;
+ }
+ }
+ }
+
+ QLIST_FOREACH(group, &group_list, next) {
+ QLIST_FOREACH(vdev, &group->device_list, next) {
+ if (vdev->needs_reset) {
+ vfio_pci_hot_reset_multi(vdev);
+ }
+ }
+ }
+}
+
static int vfio_connect_container(VFIOGroup *group)
{
VFIOContainer *container;
@@ -2900,6 +3174,10 @@ static VFIOGroup *vfio_get_group(int groupid)
return NULL;
}
+ if (QLIST_EMPTY(&group_list)) {
+ qemu_register_reset(vfio_pci_reset_handler, NULL);
+ }
+
QLIST_INSERT_HEAD(&group_list, group, next);
return group;
@@ -2916,6 +3194,10 @@ static void vfio_put_group(VFIOGroup *group)
DPRINTF("vfio_put_group: close group->fd\n");
close(group->fd);
g_free(group);
+
+ if (QLIST_EMPTY(&group_list)) {
+ qemu_unregister_reset(vfio_pci_reset_handler, NULL);
+ }
}
static int vfio_get_device(VFIOGroup *group, const char *name, VFIODevice *vdev)
@@ -2954,9 +3236,6 @@ static int vfio_get_device(VFIOGroup *group, const char *name, VFIODevice *vdev)
}
vdev->reset_works = !!(dev_info.flags & VFIO_DEVICE_FLAGS_RESET);
- if (!vdev->reset_works) {
- error_report("Warning, device %s does not support reset", name);
- }
if (dev_info.num_regions < VFIO_PCI_CONFIG_REGION_INDEX + 1) {
error_report("vfio: unexpected number of io regions %u",
@@ -3362,51 +3641,34 @@ static void vfio_pci_reset(DeviceState *dev)
{
PCIDevice *pdev = DO_UPCAST(PCIDevice, qdev, dev);
VFIODevice *vdev = DO_UPCAST(VFIODevice, pdev, pdev);
- uint16_t cmd;
DPRINTF("%s(%04x:%02x:%02x.%x)\n", __func__, vdev->host.domain,
vdev->host.bus, vdev->host.slot, vdev->host.function);
- vfio_disable_interrupts(vdev);
-
- /* Make sure the device is in D0 */
- if (vdev->pm_cap) {
- uint16_t pmcsr;
- uint8_t state;
+ vfio_pci_pre_reset(vdev);
- pmcsr = vfio_pci_read_config(pdev, vdev->pm_cap + PCI_PM_CTRL, 2);
- state = pmcsr & PCI_PM_CTRL_STATE_MASK;
- if (state) {
- pmcsr &= ~PCI_PM_CTRL_STATE_MASK;
- vfio_pci_write_config(pdev, vdev->pm_cap + PCI_PM_CTRL, pmcsr, 2);
- /* vfio handles the necessary delay here */
- pmcsr = vfio_pci_read_config(pdev, vdev->pm_cap + PCI_PM_CTRL, 2);
- state = pmcsr & PCI_PM_CTRL_STATE_MASK;
- if (state) {
- error_report("vfio: Unable to power on device, stuck in D%d\n",
- state);
- }
- }
+ if (vdev->reset_works && (vdev->has_flr || !vdev->has_pm_reset) &&
+ !ioctl(vdev->fd, VFIO_DEVICE_RESET)) {
+ DPRINTF("%04x:%02x:%02x.%x FLR/VFIO_DEVICE_RESET\n", vdev->host.domain,
+ vdev->host.bus, vdev->host.slot, vdev->host.function);
+ goto post_reset;
}
- /*
- * Stop any ongoing DMA by disconecting I/O, MMIO, and bus master.
- * Also put INTx Disable in known state.
- */
- cmd = vfio_pci_read_config(pdev, PCI_COMMAND, 2);
- cmd &= ~(PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER |
- PCI_COMMAND_INTX_DISABLE);
- vfio_pci_write_config(pdev, PCI_COMMAND, cmd, 2);
+ /* See if we can do our own bus reset */
+ if (!vfio_pci_hot_reset_one(vdev)) {
+ goto post_reset;
+ }
- if (vdev->reset_works) {
- if (ioctl(vdev->fd, VFIO_DEVICE_RESET)) {
- error_report("vfio: Error unable to reset physical device "
- "(%04x:%02x:%02x.%x): %m", vdev->host.domain,
- vdev->host.bus, vdev->host.slot, vdev->host.function);
- }
+ /* If nothing else works and the device supports PM reset, use it */
+ if (vdev->reset_works && vdev->has_pm_reset &&
+ !ioctl(vdev->fd, VFIO_DEVICE_RESET)) {
+ DPRINTF("%04x:%02x:%02x.%x PCI PM Reset\n", vdev->host.domain,
+ vdev->host.bus, vdev->host.slot, vdev->host.function);
+ goto post_reset;
}
- vfio_enable_intx(vdev);
+post_reset:
+ vfio_pci_post_reset(vdev);
}
static Property vfio_pci_dev_properties[] = {
generated by cgit v1.2.1 (git 2.18.0) at 2024-05-09 22:07:23 +0000