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dm: allocate 64bit MMIO above 4G strictly to pass OVMF check

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Remove the >32MB limitation for 64bits mmio hole allocation, ACRN
hasn't met such buggy devices for this limitation. Besides, OVMF
has one bug which requires 64bits BAR must allocate from 4G+ address,
otherwise trigger assert. This patch can workaround it.

Tracked-On: #2577
Signed-off-by: Liu Shuo A <shuo.a.liu@intel.com>
Acked-by: Yu Wang <yu1.wang@intel.com>
This commit is contained in:
Liu Shuo A 2019-01-29 17:48:18 +08:00 committed by wenlingz
parent aed75145c1
commit 32925c10bd
1 changed files with 8 additions and 22 deletions
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30
devicemodel/hw/pci/core.c
View File

@ -698,30 +698,16 @@ pci_emul_alloc_pbar(struct pci_vdev *pdi, int idx, uint64_t hostbase,
break;
case PCIBAR_MEM64:
/*
* XXX
* Some drivers do not work well if the 64-bit BAR is allocated
* above 4GB. Allow for this by allocating small requests under
* 4GB unless then allocation size is larger than some arbitrary
* number (32MB currently).
* XXX special case for device requiring peer-peer DMA
*/
if (size > 32 * 1024 * 1024) {
/*
* XXX special case for device requiring peer-peer DMA
*/
if (size == 0x100000000UL)
baseptr = &hostbase;
else
baseptr = &pci_emul_membase64;
limit = PCI_EMUL_MEMLIMIT64;
mask = PCIM_BAR_MEM_BASE;
lobits = PCIM_BAR_MEM_SPACE | PCIM_BAR_MEM_64 |
PCIM_BAR_MEM_PREFETCH;
break;
}
baseptr = &pci_emul_membase32;
limit = PCI_EMUL_MEMLIMIT32;
if (size == 0x100000000UL)
baseptr = &hostbase;
else
baseptr = &pci_emul_membase64;
limit = PCI_EMUL_MEMLIMIT64;
mask = PCIM_BAR_MEM_BASE;
lobits = PCIM_BAR_MEM_SPACE | PCIM_BAR_MEM_64;
lobits = PCIM_BAR_MEM_SPACE | PCIM_BAR_MEM_64 |
PCIM_BAR_MEM_PREFETCH;
break;
case PCIBAR_MEM32:
baseptr = &pci_emul_membase32;