diff --git a/usr.sbin/bhyve/pci_emul.h b/usr.sbin/bhyve/pci_emul.h
--- a/usr.sbin/bhyve/pci_emul.h
+++ b/usr.sbin/bhyve/pci_emul.h
@@ -233,7 +233,7 @@
 void	pci_callback(void);
 uint32_t pci_config_read_reg(const struct pci_conf *host_conf, nvlist_t *nvl,
 	    uint32_t reg, uint8_t size, uint32_t def);
-int	pci_emul_alloc_bar(struct pci_devinst *pdi, int idx,
+void	pci_emul_alloc_bar(struct pci_devinst *pdi, int idx,
 	    enum pcibar_type type, uint64_t size);
 int 	pci_emul_alloc_rom(struct pci_devinst *const pdi, const uint64_t size,
     	    void **const addr);
diff --git a/usr.sbin/bhyve/pci_emul.c b/usr.sbin/bhyve/pci_emul.c
--- a/usr.sbin/bhyve/pci_emul.c
+++ b/usr.sbin/bhyve/pci_emul.c
@@ -795,7 +795,7 @@
 		register_bar(pi, idx);
 }
 
-int
+void
 pci_emul_alloc_bar(struct pci_devinst *pdi, int idx, enum pcibar_type type,
     uint64_t size)
 {
@@ -863,7 +863,7 @@
 	 * ROM to handle this.
 	 */
 	if (!get_config_bool_default("pci.enable_bars", !bootrom_boot()))
-		return (0);
+		return;
 
 	/*
 	 * pci_passthru devices synchronize their physical and virtual command
@@ -886,8 +886,6 @@
 
 	const uint16_t cmd = pci_get_cfgdata16(pdi, PCIR_COMMAND);
 	pci_set_cfgdata16(pdi, PCIR_COMMAND, cmd | enbit);
-
-	return (0);
 }
 
 static int
@@ -1027,10 +1025,7 @@
 	}
 
 	/* allocate ROM BAR */
-	const int error = pci_emul_alloc_bar(pdi, PCI_ROM_IDX, PCIBAR_ROM,
-	    rom_size);
-	if (error)
-		return error;
+	pci_emul_alloc_bar(pdi, PCI_ROM_IDX, PCIBAR_ROM, rom_size);
 
 	/* return address */
 	*addr = pci_emul_rombase + pci_emul_romoffset;
@@ -2620,14 +2615,9 @@
 	error = pci_emul_add_msicap(pi, PCI_EMUL_MSI_MSGS);
 	assert(error == 0);
 
-	error = pci_emul_alloc_bar(pi, 0, PCIBAR_IO, DIOSZ);
-	assert(error == 0);
-
-	error = pci_emul_alloc_bar(pi, 1, PCIBAR_MEM32, DMEMSZ);
-	assert(error == 0);
-
-	error = pci_emul_alloc_bar(pi, 2, PCIBAR_MEM32, DMEMSZ);
-	assert(error == 0);
+	pci_emul_alloc_bar(pi, 0, PCIBAR_IO, DIOSZ);
+	pci_emul_alloc_bar(pi, 1, PCIBAR_MEM32, DMEMSZ);
+	pci_emul_alloc_bar(pi, 2, PCIBAR_MEM32, DMEMSZ);
 
 	return (0);
 }
diff --git a/usr.sbin/bhyve/pci_fbuf.c b/usr.sbin/bhyve/pci_fbuf.c
--- a/usr.sbin/bhyve/pci_fbuf.c
+++ b/usr.sbin/bhyve/pci_fbuf.c
@@ -409,11 +409,8 @@
 		goto done;
 	}
 
-	error = pci_emul_alloc_bar(pi, 0, PCIBAR_MEM32, DMEMSZ);
-	assert(error == 0);
-
-	error = pci_emul_alloc_bar(pi, 1, PCIBAR_MEM32, FB_SIZE);
-	assert(error == 0);
+	pci_emul_alloc_bar(pi, 0, PCIBAR_MEM32, DMEMSZ);
+	pci_emul_alloc_bar(pi, 1, PCIBAR_MEM32, FB_SIZE);
 
 	error = pci_emul_add_msicap(pi, PCI_FBUF_MSI_MSGS);
 	assert(error == 0);
diff --git a/usr.sbin/bhyve/pci_nvme.c b/usr.sbin/bhyve/pci_nvme.c
--- a/usr.sbin/bhyve/pci_nvme.c
+++ b/usr.sbin/bhyve/pci_nvme.c
@@ -3342,11 +3342,7 @@
 
 	DPRINTF("nvme membar size: %u", pci_membar_sz);
 
-	error = pci_emul_alloc_bar(pi, 0, PCIBAR_MEM64, pci_membar_sz);
-	if (error) {
-		WPRINTF("%s pci alloc mem bar failed", __func__);
-		goto done;
-	}
+	pci_emul_alloc_bar(pi, 0, PCIBAR_MEM64, pci_membar_sz);
 
 	error = pci_emul_add_msixcap(pi, sc->max_queues + 1, NVME_MSIX_BAR);
 	if (error) {
diff --git a/usr.sbin/bhyve/pci_passthru.c b/usr.sbin/bhyve/pci_passthru.c
--- a/usr.sbin/bhyve/pci_passthru.c
+++ b/usr.sbin/bhyve/pci_passthru.c
@@ -627,7 +627,7 @@
 static int
 cfginitbar(struct passthru_softc *sc)
 {
-	int i, error;
+	int i;
 	struct pci_devinst *pi;
 	struct pci_bar_io bar;
 	enum pcibar_type bartype;
@@ -681,9 +681,7 @@
 		sc->psc_bar[i].lobits = 0;
 
 		/* Allocate the BAR in the guest I/O or MMIO space */
-		error = pci_emul_alloc_bar(pi, i, bartype, size);
-		if (error)
-			return (-1);
+		pci_emul_alloc_bar(pi, i, bartype, size);
 
 		/* Use same lobits as physical bar */
 		lobits = (uint8_t)passthru_read_config(&sc->psc_sel,