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hv: vpci: add PCI BAR re-program address check

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In theory, guest could re-program PCI BAR address to any address. However, ACRN
hypervisor only support [0, top_address_space) EPT memory mapping. So we need to
check whether the PCI BAR re-program address is within this scope.

Tracked-On: #3475
Signed-off-by: Li, Fei1 <fei1.li@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>
This commit is contained in:
Li, Fei1
2019-10-14 23:26:57 +08:00
committed by wenlingz
parent dab14856c2
commit dc1e2adaec
4 changed files with 37 additions and 11 deletions
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21
hypervisor/dm/vpci/pci_pt.c
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@@ -248,15 +248,20 @@ static void vdev_pt_remap_generic_mem_vbar(struct pci_vdev *vdev, uint32_t idx)
vbar->size);
}
/* Map the physical BAR in the guest MMIO space */
ept_add_mr(vm, (uint64_t *)(vm->arch_vm.nworld_eptp),
pbar_base, /* HPA (pbar) */
vbar_base, /* GPA (new vbar) */
vbar->size,
EPT_WR | EPT_RD | EPT_UNCACHED);
if (ept_is_mr_valid(vm, vbar_base, vbar->size)) {
/* Map the physical BAR in the guest MMIO space */
ept_add_mr(vm, (uint64_t *)(vm->arch_vm.nworld_eptp),
pbar_base, /* HPA (pbar) */
vbar_base, /* GPA (new vbar) */
vbar->size,
EPT_WR | EPT_RD | EPT_UNCACHED);
/* Remember the previously mapped MMIO vbar */
vdev->bar_base_mapped[idx] = vbar_base;
/* Remember the previously mapped MMIO vbar */
vdev->bar_base_mapped[idx] = vbar_base;
} else {
pr_fatal("%s, %x:%x.%x set invalid bar[%d] address: 0x%llx\n", __func__,
vdev->bdf.bits.b, vdev->bdf.bits.d, vdev->bdf.bits.f, idx, vbar_base);
}
}
}
}