diff --git a/devicemodel/hw/pci/virtio/virtio.c b/devicemodel/hw/pci/virtio/virtio.c
index 98cbea62a..f85be6e9e 100644
--- a/devicemodel/hw/pci/virtio/virtio.c
+++ b/devicemodel/hw/pci/virtio/virtio.c
@@ -1839,131 +1839,6 @@ virtio_pci_write(struct vmctx *ctx, int vcpu, struct pci_vdev *dev,
 		base->vops->name, baridx);
 }
 
-/**
- * @brief Handle PCI configuration space reads.
- *
- * Handle virtio PCI configuration space reads. Only the specific registers
- * that need speical operation are handled in this callback. For others just
- * fallback to pci core. This interface is only valid for virtio modern.
- *
- * @param ctx Pointer to struct vmctx representing VM context.
- * @param vcpu VCPU ID.
- * @param dev Pointer to struct pci_vdev which emulates a PCI device.
- * @param coff Register offset in bytes within PCI configuration space.
- * @param bytes Access range in bytes.
- * @param rv The value returned as read.
- *
- * @return 0 on handled and non-zero on non-handled.
- */
-int
-virtio_pci_modern_cfgread(struct vmctx *ctx, int vcpu, struct pci_vdev *dev,
-			  int coff, int bytes, uint32_t *rv)
-{
-	struct virtio_base *base = dev->arg;
-	struct virtio_pci_cfg_cap *cfg;
-	uint32_t value;
-	int cfg_coff = base->cfg_coff;
-	size_t cfg_data_offset;
-
-	cfg_data_offset = offsetof(struct virtio_pci_cfg_cap, pci_cfg_data);
-
-	/* we only need to handle the read to
-	 * virtio_pci_cfg_cap.pci_cfg_data[]
-	 * fallback for anything else by return -1
-	 */
-	if ((cfg_coff > 0) && (coff >= cfg_coff + cfg_data_offset) &&
-		(coff + bytes <= cfg_coff + sizeof(*cfg))) {
-		cfg = (struct virtio_pci_cfg_cap *)&dev->cfgdata[cfg_coff];
-		if (cfg->cap.bar == base->modern_pio_bar_idx)
-			value = virtio_pci_modern_pio_read(ctx, vcpu, dev,
-				cfg->cap.bar, cfg->cap.offset, cfg->cap.length);
-		else if (cfg->cap.bar == base->modern_mmio_bar_idx)
-			value = virtio_pci_modern_mmio_read(ctx, vcpu, dev,
-				cfg->cap.bar, cfg->cap.offset, cfg->cap.length);
-		else {
-			fprintf(stderr, "%s: cfgread unexpected baridx %d\r\n",
-				base->vops->name, cfg->cap.bar);
-			value = 0;
-		}
-
-		/* update pci_cfg_data */
-		if (cfg->cap.length == 1)
-			pci_set_cfgdata8(dev, cfg_coff + cfg_data_offset,
-				value);
-		else if (cfg->cap.length == 2)
-			pci_set_cfgdata16(dev, cfg_coff + cfg_data_offset,
-				value);
-		else
-			pci_set_cfgdata32(dev, cfg_coff + cfg_data_offset,
-				value);
-
-		*rv = value;
-		return 0;
-	}
-
-	return -1;
-}
-
-/**
- * @brief Handle PCI configuration space writes.
- *
- * Handle virtio PCI configuration space writes. Only the specific registers
- * that need speical operation are handled in this callback. For others just
- * fallback to pci core. This interface is only valid for virtio modern.
- *
- * @param ctx Pointer to struct vmctx representing VM context.
- * @param vcpu VCPU ID.
- * @param dev Pointer to struct pci_vdev which emulates a PCI device.
- * @param coff Register offset in bytes within PCI configuration space.
- * @param bytes Access range in bytes.
- * @param val The value to write.
- *
- * @return 0 on handled and non-zero on non-handled.
- */
-int
-virtio_pci_modern_cfgwrite(struct vmctx *ctx, int vcpu, struct pci_vdev *dev,
-			   int coff, int bytes, uint32_t val)
-{
-	struct virtio_base *base = dev->arg;
-	struct virtio_pci_cfg_cap *cfg;
-	int cfg_coff = base->cfg_coff;
-	size_t cfg_data_offset;
-
-	cfg_data_offset = offsetof(struct virtio_pci_cfg_cap, pci_cfg_data);
-
-	/* we only need to handle the write to
-	 * virtio_pci_cfg_cap.pci_cfg_data[]
-	 * fallback for anything else by return -1
-	 */
-	if ((cfg_coff > 0) && (coff >= cfg_coff + cfg_data_offset) &&
-		(coff + bytes <= cfg_coff + sizeof(*cfg))) {
-		/* default cfg write */
-		if (bytes == 1)
-			pci_set_cfgdata8(dev, coff, val);
-		else if (bytes == 2)
-			pci_set_cfgdata16(dev, coff, val);
-		else
-			pci_set_cfgdata32(dev, coff, val);
-
-		cfg = (struct virtio_pci_cfg_cap *)&dev->cfgdata[cfg_coff];
-		if (cfg->cap.bar == base->modern_pio_bar_idx)
-			virtio_pci_modern_pio_write(ctx, vcpu, dev,
-				cfg->cap.bar, cfg->cap.offset,
-				cfg->cap.length, val);
-		else if (cfg->cap.bar == base->modern_mmio_bar_idx)
-			virtio_pci_modern_mmio_write(ctx, vcpu, dev,
-				cfg->cap.bar, cfg->cap.offset,
-				cfg->cap.length, val);
-		else
-			fprintf(stderr, "%s: cfgwrite unexpected baridx %d\r\n",
-				base->vops->name, cfg->cap.bar);
-
-		return 0;
-	}
-
-	return -1;
-}
-
 /**
  * @brief Get the virtio poll parameters
  *
diff --git a/devicemodel/include/virtio.h b/devicemodel/include/virtio.h
index eb4ba4a45..37a7c95b0 100644
--- a/devicemodel/include/virtio.h
+++ b/devicemodel/include/virtio.h
@@ -730,44 +730,6 @@ void virtio_pci_write(struct vmctx *ctx, int vcpu, struct pci_vdev *dev,
  */
 int virtio_set_modern_bar(struct virtio_base *base, bool use_notify_pio);
 
-/**
- * @brief Handle PCI configuration space reads.
- *
- * Handle virtio PCI configuration space reads. Only the specific registers
- * that need speical operation are handled in this callback. For others just
- * fallback to pci core. This interface is only valid for virtio modern.
- *
- * @param ctx Pointer to struct vmctx representing VM context.
- * @param vcpu VCPU ID.
- * @param dev Pointer to struct pci_vdev which emulates a PCI device.
- * @param coff Register offset in bytes within PCI configuration space.
- * @param bytes Access range in bytes.
- * @param rv The value returned as read.
- *
- * @return 0 on handled and non-zero on non-handled.
- */
-int virtio_pci_modern_cfgread(struct vmctx *ctx, int vcpu, struct pci_vdev *dev,
-			      int coff, int bytes, uint32_t *rv);
-/**
- * @brief Handle PCI configuration space writes.
- *
- * Handle virtio PCI configuration space writes. Only the specific registers
- * that need speical operation are handled in this callback. For others just
- * fallback to pci core. This interface is only valid for virtio modern.
- *
- * @param ctx Pointer to struct vmctx representing VM context.
- * @param vcpu VCPU ID.
- * @param dev Pointer to struct pci_vdev which emulates a PCI device.
- * @param coff Register offset in bytes within PCI configuration space.
- * @param bytes Access range in bytes.
- * @param val The value to write.
- *
- * @return 0 on handled and non-zero on non-handled.
- */
-int virtio_pci_modern_cfgwrite(struct vmctx *ctx, int vcpu,
-			       struct pci_vdev *dev, int coff, int bytes,
-			       uint32_t val);
-
 /**
  * @}
  */