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-rw-r--r--hw/vfio/migration.c160
-rw-r--r--hw/vfio/trace-events2
-rw-r--r--include/hw/vfio/vfio-common.h4
3 files changed, 166 insertions, 0 deletions
diff --git a/hw/vfio/migration.c b/hw/vfio/migration.c
index fd7faf4..e1ffae0 100644
--- a/hw/vfio/migration.c
+++ b/hw/vfio/migration.c
@@ -10,6 +10,7 @@
#include "qemu/osdep.h"
#include <linux/vfio.h>
+#include "sysemu/runstate.h"
#include "hw/vfio/vfio-common.h"
#include "cpu.h"
#include "migration/migration.h"
@@ -22,6 +23,157 @@
#include "exec/ram_addr.h"
#include "pci.h"
#include "trace.h"
+#include "hw/hw.h"
+
+static inline int vfio_mig_access(VFIODevice *vbasedev, void *val, int count,
+ off_t off, bool iswrite)
+{
+ int ret;
+
+ ret = iswrite ? pwrite(vbasedev->fd, val, count, off) :
+ pread(vbasedev->fd, val, count, off);
+ if (ret < count) {
+ error_report("vfio_mig_%s %d byte %s: failed at offset 0x%"
+ HWADDR_PRIx", err: %s", iswrite ? "write" : "read", count,
+ vbasedev->name, off, strerror(errno));
+ return (ret < 0) ? ret : -EINVAL;
+ }
+ return 0;
+}
+
+static int vfio_mig_rw(VFIODevice *vbasedev, __u8 *buf, size_t count,
+ off_t off, bool iswrite)
+{
+ int ret, done = 0;
+ __u8 *tbuf = buf;
+
+ while (count) {
+ int bytes = 0;
+
+ if (count >= 8 && !(off % 8)) {
+ bytes = 8;
+ } else if (count >= 4 && !(off % 4)) {
+ bytes = 4;
+ } else if (count >= 2 && !(off % 2)) {
+ bytes = 2;
+ } else {
+ bytes = 1;
+ }
+
+ ret = vfio_mig_access(vbasedev, tbuf, bytes, off, iswrite);
+ if (ret) {
+ return ret;
+ }
+
+ count -= bytes;
+ done += bytes;
+ off += bytes;
+ tbuf += bytes;
+ }
+ return done;
+}
+
+#define vfio_mig_read(f, v, c, o) vfio_mig_rw(f, (__u8 *)v, c, o, false)
+#define vfio_mig_write(f, v, c, o) vfio_mig_rw(f, (__u8 *)v, c, o, true)
+
+#define VFIO_MIG_STRUCT_OFFSET(f) \
+ offsetof(struct vfio_device_migration_info, f)
+/*
+ * Change the device_state register for device @vbasedev. Bits set in @mask
+ * are preserved, bits set in @value are set, and bits not set in either @mask
+ * or @value are cleared in device_state. If the register cannot be accessed,
+ * the resulting state would be invalid, or the device enters an error state,
+ * an error is returned.
+ */
+
+static int vfio_migration_set_state(VFIODevice *vbasedev, uint32_t mask,
+ uint32_t value)
+{
+ VFIOMigration *migration = vbasedev->migration;
+ VFIORegion *region = &migration->region;
+ off_t dev_state_off = region->fd_offset +
+ VFIO_MIG_STRUCT_OFFSET(device_state);
+ uint32_t device_state;
+ int ret;
+
+ ret = vfio_mig_read(vbasedev, &device_state, sizeof(device_state),
+ dev_state_off);
+ if (ret < 0) {
+ return ret;
+ }
+
+ device_state = (device_state & mask) | value;
+
+ if (!VFIO_DEVICE_STATE_VALID(device_state)) {
+ return -EINVAL;
+ }
+
+ ret = vfio_mig_write(vbasedev, &device_state, sizeof(device_state),
+ dev_state_off);
+ if (ret < 0) {
+ int rret;
+
+ rret = vfio_mig_read(vbasedev, &device_state, sizeof(device_state),
+ dev_state_off);
+
+ if ((rret < 0) || (VFIO_DEVICE_STATE_IS_ERROR(device_state))) {
+ hw_error("%s: Device in error state 0x%x", vbasedev->name,
+ device_state);
+ return rret ? rret : -EIO;
+ }
+ return ret;
+ }
+
+ migration->device_state = device_state;
+ trace_vfio_migration_set_state(vbasedev->name, device_state);
+ return 0;
+}
+
+static void vfio_vmstate_change(void *opaque, int running, RunState state)
+{
+ VFIODevice *vbasedev = opaque;
+ VFIOMigration *migration = vbasedev->migration;
+ uint32_t value, mask;
+ int ret;
+
+ if (vbasedev->migration->vm_running == running) {
+ return;
+ }
+
+ if (running) {
+ /*
+ * Here device state can have one of _SAVING, _RESUMING or _STOP bit.
+ * Transition from _SAVING to _RUNNING can happen if there is migration
+ * failure, in that case clear _SAVING bit.
+ * Transition from _RESUMING to _RUNNING occurs during resuming
+ * phase, in that case clear _RESUMING bit.
+ * In both the above cases, set _RUNNING bit.
+ */
+ mask = ~VFIO_DEVICE_STATE_MASK;
+ value = VFIO_DEVICE_STATE_RUNNING;
+ } else {
+ /*
+ * Here device state could be either _RUNNING or _SAVING|_RUNNING. Reset
+ * _RUNNING bit
+ */
+ mask = ~VFIO_DEVICE_STATE_RUNNING;
+ value = 0;
+ }
+
+ ret = vfio_migration_set_state(vbasedev, mask, value);
+ if (ret) {
+ /*
+ * Migration should be aborted in this case, but vm_state_notify()
+ * currently does not support reporting failures.
+ */
+ error_report("%s: Failed to set device state 0x%x", vbasedev->name,
+ (migration->device_state & mask) | value);
+ qemu_file_set_error(migrate_get_current()->to_dst_file, ret);
+ }
+ vbasedev->migration->vm_running = running;
+ trace_vfio_vmstate_change(vbasedev->name, running, RunState_str(state),
+ (migration->device_state & mask) | value);
+}
static void vfio_migration_exit(VFIODevice *vbasedev)
{
@@ -38,6 +190,7 @@ static int vfio_migration_init(VFIODevice *vbasedev,
{
int ret;
Object *obj;
+ VFIOMigration *migration;
if (!vbasedev->ops->vfio_get_object) {
return -EINVAL;
@@ -64,6 +217,10 @@ static int vfio_migration_init(VFIODevice *vbasedev,
ret = -EINVAL;
goto err;
}
+
+ migration = vbasedev->migration;
+ migration->vm_state = qemu_add_vm_change_state_handler(vfio_vmstate_change,
+ vbasedev);
return 0;
err:
@@ -111,6 +268,9 @@ add_blocker:
void vfio_migration_finalize(VFIODevice *vbasedev)
{
if (vbasedev->migration) {
+ VFIOMigration *migration = vbasedev->migration;
+
+ qemu_del_vm_change_state_handler(migration->vm_state);
vfio_migration_exit(vbasedev);
}
diff --git a/hw/vfio/trace-events b/hw/vfio/trace-events
index 9ced5ec..41de81f 100644
--- a/hw/vfio/trace-events
+++ b/hw/vfio/trace-events
@@ -148,3 +148,5 @@ vfio_display_edid_write_error(void) ""
# migration.c
vfio_migration_probe(const char *name, uint32_t index) " (%s) Region %d"
+vfio_migration_set_state(const char *name, uint32_t state) " (%s) state %d"
+vfio_vmstate_change(const char *name, int running, const char *reason, uint32_t dev_state) " (%s) running %d reason %s device state %d"
diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h
index 8275c4c..9a571f1 100644
--- a/include/hw/vfio/vfio-common.h
+++ b/include/hw/vfio/vfio-common.h
@@ -29,6 +29,7 @@
#ifdef CONFIG_LINUX
#include <linux/vfio.h>
#endif
+#include "sysemu/sysemu.h"
#define VFIO_MSG_PREFIX "vfio %s: "
@@ -58,7 +59,10 @@ typedef struct VFIORegion {
} VFIORegion;
typedef struct VFIOMigration {
+ VMChangeStateEntry *vm_state;
VFIORegion region;
+ uint32_t device_state;
+ int vm_running;
} VFIOMigration;
typedef struct VFIOAddressSpace {
generated by cgit v1.1 at 2024-11-03 05:17:50 +0000