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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
@@ -33,9 +33,6 @@
#include <sys/param.h>
#include <sys/linker_set.h>
-#include <vm/vm.h>
-#include <vm/vm_param.h>
-#include <vm/pmap.h>
#include <ctype.h>
#include <errno.h>
@@ -49,8 +46,6 @@
#include <machine/vmm.h>
#include <machine/vmm_snapshot.h>
-#include <machine/cpufunc.h>
-#include <machine/specialreg.h>
#include <vmmapi.h>
#include "acpi.h"
@@ -73,6 +68,8 @@
#define MAXSLOTS (PCI_SLOTMAX + 1)
#define MAXFUNCS (PCI_FUNCMAX + 1)
+#define GB (1024 * 1024 * 1024UL)
+
struct funcinfo {
nvlist_t *fi_config;
struct pci_devemu *fi_pde;
@@ -114,6 +111,7 @@
SYSRES_MEM(PCI_EMUL_ECFG_BASE, PCI_EMUL_ECFG_SIZE);
#define PCI_EMUL_MEMLIMIT32 PCI_EMUL_ECFG_BASE
+#define PCI_EMUL_MEMSIZE64 (32*GB)
static struct pci_devemu *pci_emul_finddev(const char *name);
static void pci_lintr_route(struct pci_devinst *pi);
@@ -1155,25 +1153,15 @@
nvlist_t *nvl;
const char *emul;
size_t lowmem;
- uint64_t cpu_maxphysaddr, pci_emul_memresv64;
- u_int regs[4];
- int bus, slot, func, error;
+ int bus, slot, func;
+ int error;
pci_emul_iobase = PCI_EMUL_IOBASE;
pci_emul_membase32 = vm_get_lowmem_limit(ctx);
- do_cpuid(0x80000008, regs);
- cpu_maxphysaddr = 1ULL << (regs[0] & 0xff);
- if (cpu_maxphysaddr > VM_MAXUSER_ADDRESS_LA48)
- cpu_maxphysaddr = VM_MAXUSER_ADDRESS_LA48;
- pci_emul_memresv64 = cpu_maxphysaddr / 4;
- /*
- * Max power of 2 that is less then
- * cpu_maxphysaddr - pci_emul_memresv64.
- */
- pci_emul_membase64 = 1ULL << (flsl(cpu_maxphysaddr -
- pci_emul_memresv64) - 1);
- pci_emul_memlim64 = cpu_maxphysaddr;
+ pci_emul_membase64 = 4*GB + vm_get_highmem_size(ctx);
+ pci_emul_membase64 = roundup2(pci_emul_membase64, PCI_EMUL_MEMSIZE64);
+ pci_emul_memlim64 = pci_emul_membase64 + PCI_EMUL_MEMSIZE64;
for (bus = 0; bus < MAXBUSES; bus++) {
snprintf(node_name, sizeof(node_name), "pci.%d", bus);

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