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Setup accesses to the memory hole below 4GB to return all 1's on read and

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consume all writes without any side effects.

Obtained from:	NetApp
This commit is contained in:
Neel Natu 2013-04-17 02:03:12 +00:00
parent 8e9405e8a7
commit 9f08548d20
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=249572
1 changed files with 15 additions and 9 deletions
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24
usr.sbin/bhyve/pci_emul.c
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@ -88,8 +88,6 @@ static struct lirqinfo {
SET_DECLARE(pci_devemu_set, struct pci_devemu);
static uint32_t pci_hole_startaddr;
static uint64_t pci_emul_iobase;
static uint64_t pci_emul_membase32;
static uint64_t pci_emul_membase64;
@ -977,13 +975,12 @@ init_pci(struct vmctx *ctx)
struct mem_range memp;
struct pci_devemu *pde;
struct slotinfo *si;
size_t lowmem;
int slot, func;
int error;
pci_hole_startaddr = vm_get_lowmem_limit(ctx);
pci_emul_iobase = PCI_EMUL_IOBASE;
pci_emul_membase32 = pci_hole_startaddr;
pci_emul_membase32 = vm_get_lowmem_limit(ctx);
pci_emul_membase64 = PCI_EMUL_MEMBASE64;
for (slot = 0; slot < MAXSLOTS; slot++) {
@ -1010,14 +1007,23 @@ init_pci(struct vmctx *ctx)
lirq[15].li_generic = 1;
/*
* Setup the PCI hole to return 0xff's when accessed in a region
* with no devices
* The guest physical memory map looks like the following:
* [0, lowmem) guest system memory
* [lowmem, lowmem_limit) memory hole (may be absent)
* [lowmem_limit, 4GB) PCI hole (32-bit BAR allocation)
* [4GB, 4GB + highmem)
*
* Accesses to memory addresses that are not allocated to system
* memory or PCI devices return 0xff's.
*/
error = vm_get_memory_seg(ctx, 0, &lowmem);
assert(error == 0);
memset(&memp, 0, sizeof(struct mem_range));
memp.name = "PCI hole";
memp.flags = MEM_F_RW;
memp.base = pci_hole_startaddr;
memp.size = (4ULL * 1024 * 1024 * 1024) - pci_hole_startaddr;
memp.base = lowmem;
memp.size = (4ULL * 1024 * 1024 * 1024) - lowmem;
memp.handler = pci_emul_fallback_handler;
error = register_mem_fallback(&memp);