@@ -46,6 +46,7 @@
#include "qapi/qapi-events-misc.h"
#include "qemu/notify.h"
#include "qemu/thread.h"
+#include "qemu/main-loop.h"
#include "sysemu/sysemu.h"
#include "libvfio-user.h"
#include "hw/qdev-core.h"
@@ -244,6 +245,45 @@ retry_attach:
qemu_set_fd_handler(o->vfu_poll_fd, vfu_object_ctx_run, NULL, o);
}
+static ssize_t vfu_object_cfg_access(vfu_ctx_t *vfu_ctx, char * const buf,
+ size_t count, loff_t offset,
+ const bool is_write)
+{
+ VfuObject *o = vfu_get_private(vfu_ctx);
+ uint32_t pci_access_width = sizeof(uint32_t);
+ size_t bytes = count;
+ uint32_t val = 0;
+ char *ptr = buf;
+ int len;
+
+ /*
+ * Writes to the BAR registers would trigger an update to the
+ * global Memory and IO AddressSpaces. But the remote device
+ * never uses the global AddressSpaces, therefore overlapping
+ * memory regions are not a problem
+ */
+ while (bytes > 0) {
+ len = (bytes > pci_access_width) ? pci_access_width : bytes;
+ if (is_write) {
+ memcpy(&val, ptr, len);
+ pci_host_config_write_common(o->pci_dev, offset,
+ pci_config_size(o->pci_dev),
+ val, len);
+ trace_vfu_cfg_write(offset, val);
+ } else {
+ val = pci_host_config_read_common(o->pci_dev, offset,
+ pci_config_size(o->pci_dev), len);
+ memcpy(ptr, &val, len);
+ trace_vfu_cfg_read(offset, val);
+ }
+ offset += len;
+ ptr += len;
+ bytes -= len;
+ }
+
+ return count;
+}
+
/*
* TYPE_VFU_OBJECT depends on the availability of the 'socket' and 'device'
* properties. It also depends on devices instantiated in QEMU. These
@@ -336,6 +376,17 @@ static void vfu_object_init_ctx(VfuObject *o, Error **errp)
TYPE_VFU_OBJECT, o->device);
qdev_add_unplug_blocker(DEVICE(o->pci_dev), o->unplug_blocker);
+ ret = vfu_setup_region(o->vfu_ctx, VFU_PCI_DEV_CFG_REGION_IDX,
+ pci_config_size(o->pci_dev), &vfu_object_cfg_access,
+ VFU_REGION_FLAG_RW | VFU_REGION_FLAG_ALWAYS_CB,
+ NULL, 0, -1, 0);
+ if (ret < 0) {
+ error_setg(errp,
+ "vfu: Failed to setup config space handlers for %s- %s",
+ o->device, strerror(errno));
+ goto fail;
+ }
+
ret = vfu_realize_ctx(o->vfu_ctx);
if (ret < 0) {
error_setg(errp, "vfu: Failed to realize device %s- %s",
@@ -5,3 +5,5 @@ mpqemu_recv_io_error(int cmd, int size, int nfds) "failed to receive %d size %d,
# vfio-user-obj.c
vfu_prop(const char *prop, const char *val) "vfu: setting %s as %s"
+vfu_cfg_read(uint32_t offset, uint32_t val) "vfu: cfg: 0x%u -> 0x%x"
+vfu_cfg_write(uint32_t offset, uint32_t val) "vfu: cfg: 0x%u <- 0x%x"