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diff --git a/usr.sbin/bhyve/pci_passthru.h b/usr.sbin/bhyve/pci_passthru.h
--- a/usr.sbin/bhyve/pci_passthru.h
+++ b/usr.sbin/bhyve/pci_passthru.h
@@ -11,6 +11,13 @@
#include "pci_emul.h"
+struct passthru_softc;
+
+typedef int (*cfgread_handler)(struct passthru_softc *sc,
+ struct pci_devinst *pi, int coff, int bytes, uint32_t *rv);
+typedef int (*cfgwrite_handler)(struct passthru_softc *sc,
+ struct pci_devinst *pi, int coff, int bytes, uint32_t val);
+
struct passthru_softc {
struct pci_devinst *psc_pi;
/* ROM is handled like a BAR */
@@ -24,7 +31,16 @@
int capoff;
} psc_msix;
struct pcisel psc_sel;
+
+ cfgread_handler psc_pcir_rhandler[PCI_REGMAX + 1];
+ cfgwrite_handler psc_pcir_whandler[PCI_REGMAX + 1];
};
uint32_t read_config(const struct pcisel *sel, long reg, int width);
void write_config(const struct pcisel *sel, long reg, int width, uint32_t data);
+int passthru_cfgread_default(struct passthru_softc *sc, struct pci_devinst *pi,
+ int coff, int bytes, uint32_t *rv);
+int passthru_cfgwrite_default(struct passthru_softc *sc, struct pci_devinst *pi,
+ int coff, int bytes, uint32_t val);
+int set_pcir_handler(struct passthru_softc *sc, int reg, int len,
+ cfgread_handler rhandler, cfgwrite_handler whandler);
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
@@ -628,6 +628,21 @@
return (error);
}
+int
+set_pcir_handler(struct passthru_softc *sc, int reg, int len,
+ cfgread_handler rhandler, cfgwrite_handler whandler)
+{
+ if (reg > PCI_REGMAX || reg + len > PCI_REGMAX + 1)
+ return (-1);
+
+ for (int i = reg; i < reg + len; ++i) {
+ sc->psc_pcir_rhandler[i] = rhandler;
+ sc->psc_pcir_whandler[i] = whandler;
+ }
+
+ return 0;
+}
+
static int
passthru_legacy_config(nvlist_t *nvl, const char *opts)
{
@@ -841,6 +856,14 @@
get_config_value_node(nvl, "rom"))) != 0)
goto done;
+ /*
+ * Default PCI config register to accessing the config register of the
+ * physical device.
+ */
+ if ((error = set_pcir_handler(sc, 0, PCI_REGMAX + 1,
+ passthru_cfgread_default, passthru_cfgwrite_default)) != 0)
+ goto done;
+
error = 0; /* success */
done:
if (error) {
@@ -893,6 +916,13 @@
sc = pi->pi_arg;
+ return (sc->psc_pcir_rhandler[coff](sc, pi, coff, bytes, rv));
+}
+
+int
+passthru_cfgread_default(struct passthru_softc *sc,
+ struct pci_devinst *pi __unused, int coff, int bytes, uint32_t *rv)
+{
/*
* PCI BARs and MSI capability is emulated.
*/
@@ -933,12 +963,20 @@
static int
passthru_cfgwrite(struct pci_devinst *pi, int coff, int bytes, uint32_t val)
{
- int error, msix_table_entries, i;
struct passthru_softc *sc;
- uint16_t cmd_old;
sc = pi->pi_arg;
+ return (sc->psc_pcir_whandler[coff](sc, pi, coff, bytes, val));
+}
+
+int
+passthru_cfgwrite_default(struct passthru_softc *sc, struct pci_devinst *pi,
+ int coff, int bytes, uint32_t val)
+{
+ int error, msix_table_entries, i;
+ uint16_t cmd_old;
+
/*
* PCI BARs are emulated
*/

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