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iommu/amd: Don't copy GCR3 table root pointer

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When iommu is pre_enabled in kdump kernel, if a device is set up with
guest translations (DTE.GV=1), then don't copy GCR3 table root pointer
but move the device over to an empty guest-cr3 table and handle the
faults in the PPR log (which answer them with INVALID). After all these
PPR faults are recoverable for the device and we should not allow the
device to change old-kernels data when we don't have to.

Signed-off-by: Baoquan He <bhe@redhat.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Baoquan He
2017-08-09 16:33:43 +08:00
committed by Joerg Roedel
parent b336781b82
commit daae2d25a4
5 changed files with 57 additions and 26 deletions
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18
drivers/iommu/amd_iommu_v2.c
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@@ -562,14 +562,30 @@ static int ppr_notifier(struct notifier_block *nb, unsigned long e, void *data)
unsigned long flags;
struct fault *fault;
bool finish;
u16 tag;
u16 tag, devid;
int ret;
struct iommu_dev_data *dev_data;
struct pci_dev *pdev = NULL;
iommu_fault = data;
tag = iommu_fault->tag & 0x1ff;
finish = (iommu_fault->tag >> 9) & 1;
devid = iommu_fault->device_id;
pdev = pci_get_bus_and_slot(PCI_BUS_NUM(devid), devid & 0xff);
if (!pdev)
return -ENODEV;
dev_data = get_dev_data(&pdev->dev);
/* In kdump kernel pci dev is not initialized yet -> send INVALID */
ret = NOTIFY_DONE;
if (translation_pre_enabled(amd_iommu_rlookup_table[devid])
&& dev_data->defer_attach) {
amd_iommu_complete_ppr(pdev, iommu_fault->pasid,
PPR_INVALID, tag);
goto out;
}
dev_state = get_device_state(iommu_fault->device_id);
if (dev_state == NULL)
goto out;