D58894.1794748292.diff
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	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
	@@ -678,12 +678,14 @@
	sc->psc_bar[i].type = bartype;
	sc->psc_bar[i].size = size;
	sc->psc_bar[i].addr = base;
	- sc->psc_bar[i].lobits = 0;

	/* Allocate the BAR in the guest I/O or MMIO space */
	pci_emul_alloc_bar(pi, i, bartype, size);

	- /* Use same lobits as physical bar */
	+ /*
	+ * Use same lobits as physical BAR to preserve
	+ * prefetch flag.
	+ */
	lobits = (uint8_t)passthru_read_config(&sc->psc_sel,
	PCIR_BAR(i), 0x01);
	if (bartype == PCIBAR_MEM32 \|\| bartype == PCIBAR_MEM64) {
	@@ -691,7 +693,6 @@
	} else {
	lobits &= ~PCIM_BAR_IO_BASE;
	}
	- sc->psc_bar[i].lobits = lobits;
	pi->pi_bar[i].lobits = lobits;

	/*