powerpc/pseries/iommu: LPAR panics during boot up with a frozen PE

In the Linux kernel, the following vulnerability has been resolved:

powerpc/pseries/iommu: LPAR panics during boot up with a frozen PE

At the time of LPAR boot up, partition firmware provides Open Firmware

property ibm,dma-window for the PE. This property is provided on the PCI

bus the PE is attached to.

There are execptions where the partition firmware might not provide this

property for the PE at the time of LPAR boot up. One of the scenario is

where the firmware has frozen the PE due to some error condition. This

PE is frozen for 24 hours or unless the whole system is reinitialized.

Within this time frame, if the LPAR is booted, the frozen PE will be

presented to the LPAR but ibm,dma-window property could be missing.

Today, under these circumstances, the LPAR oopses with NULL pointer

dereference, when configuring the PCI bus the PE is attached to.

BUG: Kernel NULL pointer dereference on read at 0x000000c8

Faulting instruction address: 0xc0000000001024c0

Oops: Kernel access of bad area, sig: 7 [#1]

LE PAGE_SIZE=64K MMU=Radix SMP NR_CPUS=2048 NUMA pSeries

Modules linked in:

Supported: Yes

CPU: 0 PID: 1 Comm: swapper/0 Not tainted 6.4.0-150600.9-default #1

Hardware name: IBM,9043-MRX POWER10 (raw) 0x800200 0xf000006 of:IBM,FW1060.00 (NM1060_023) hv:phyp pSeries

NIP: c0000000001024c0 LR: c0000000001024b0 CTR: c000000000102450

REGS: c0000000037db5c0 TRAP: 0300 Not tainted (6.4.0-150600.9-default)

MSR: 8000000002009033 <SF,VEC,EE,ME,IR,DR,RI,LE> CR: 28000822 XER: 00000000

CFAR: c00000000010254c DAR: 00000000000000c8 DSISR: 00080000 IRQMASK: 0

...

NIP [c0000000001024c0] pci_dma_bus_setup_pSeriesLP+0x70/0x2a0

LR [c0000000001024b0] pci_dma_bus_setup_pSeriesLP+0x60/0x2a0

Call Trace:

pci_dma_bus_setup_pSeriesLP+0x60/0x2a0 (unreliable)

pcibios_setup_bus_self+0x1c0/0x370

__of_scan_bus+0x2f8/0x330

pcibios_scan_phb+0x280/0x3d0

pcibios_init+0x88/0x12c

do_one_initcall+0x60/0x320

kernel_init_freeable+0x344/0x3e4

kernel_init+0x34/0x1d0

ret_from_kernel_user_thread+0x14/0x1c