D40060.1794110677.diff
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	diff --git a/usr.sbin/bhyve/pci_gvt-d.c b/usr.sbin/bhyve/pci_gvt-d.c
	--- a/usr.sbin/bhyve/pci_gvt-d.c
	+++ b/usr.sbin/bhyve/pci_gvt-d.c
	@@ -20,6 +20,8 @@
	#define MB (1024 * KB)
	#define GB (1024 * MB)

	+#define PCIR_BDSM 0x5C /* Base of Data Stolen Memory register */
	+
	#define PCIM_BDSM_GSM_ALIGNMENT \
	0x00100000 /* Graphics Stolen Memory is 1 MB aligned */

	@@ -73,6 +75,7 @@
	struct passthru_softc *sc;
	struct passthru_mmio_mapping *gsm;
	size_t sysctl_len;
	+ uint64_t bdsm;
	int error;

	sc = pi->pi_arg;
	@@ -133,7 +136,12 @@
	"Warning: Unable to reuse host address of Graphics Stolen Memory. GPU passthrough might not work properly.");
	}

	- return (0);
	+ bdsm = read_config(passthru_get_sel(sc), PCIR_BDSM, 4);
	+ pci_set_cfgdata32(pi, PCIR_BDSM,
	+ gsm->gpa \| (bdsm & (PCIM_BDSM_GSM_ALIGNMENT - 1)));
	+
	+ return (set_pcir_handler(sc, PCIR_BDSM, 4, passthru_cfgread_emulate,
	+ passthru_cfgwrite_emulate));
	}

	int