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dm: leave a gap for 32-bit PCI hole in E820 map

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Guest OS (e.g. Linux) may rely on a gap in E820 map in the 32-bit memory
space to determine the MMIO space for its PCI devices. Leave this gap
when building E820 map to keep the guest's PCI subsystem working.

After commit 7752d5cfe3d11ca0bb9c673ec38bd78ba6578f8e, Linux kernel no
longer requires the MMCONFIG region to be reserved in the E820 map.
Nonetheless, keep it in the reserved region to be on the safe side.

Tracked-On: #2843
Signed-off-by: Peter Fang <peter.fang@intel.com>
Acked-by: Yin Fengwei <fengwei.yin@intel.com>
This commit is contained in:
Peter Fang
2019-03-22 05:22:55 -07:00
committed by ACRN System Integration
parent 3be6c6593f
commit 20164799cb
4 changed files with 10 additions and 16 deletions
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7
devicemodel/hw/pci/core.c
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@@ -93,7 +93,6 @@ extern bool skip_pci_mem64bar_workaround;
#define PCI_EMUL_IOBASE 0x2000
#define PCI_EMUL_IOLIMIT 0x10000
#define PCI_EMUL_ECFG_BASE 0xE0000000 /* 3.5GB */
#define PCI_EMUL_ECFG_SIZE (MAXBUSES * 1024 * 1024) /* 1MB per bus */
SYSRES_MEM(PCI_EMUL_ECFG_BASE, PCI_EMUL_ECFG_SIZE);
@@ -1238,12 +1237,6 @@ pci_emul_ecfg_handler(struct vmctx *ctx, int vcpu, int dir, uint64_t addr,
return 0;
}
uint64_t
pci_ecfg_base(void)
{
return PCI_EMUL_ECFG_BASE;
}
#define BUSIO_ROUNDUP 32
#define BUSMEM_ROUNDUP (1024 * 1024)