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Narayana Murty N a2531e1971 powerpc/eeh: Fix missing PE bridge reconfiguration during VFIO EEH recovery 
[ Upstream commit 33bc69cf66 ]

VFIO EEH recovery for PCI passthrough devices fails on PowerNV and pseries
platforms due to missing host-side PE bridge reconfiguration. In the
current implementation, eeh_pe_configure() only performs RTAS or OPAL-based
bridge reconfiguration for native host devices, but skips it entirely for
PEs managed through VFIO in guest passthrough scenarios.

This leads to incomplete EEH recovery when a PCI error affects a
passthrough device assigned to a QEMU/KVM guest. Although VFIO triggers the
EEH recovery flow through VFIO_EEH_PE_ENABLE ioctl, the platform-specific
bridge reconfiguration step is silently bypassed. As a result, the PE's
config space is not fully restored, causing subsequent config space access
failures or EEH freeze-on-access errors inside the guest.

This patch fixes the issue by ensuring that eeh_pe_configure() always
invokes the platform's configure_bridge() callback (e.g.,
pseries_eeh_phb_configure_bridge) even for VFIO-managed PEs. This ensures
that RTAS or OPAL calls to reconfigure the PE bridge are correctly issued
on the host side, restoring the PE's configuration space after an EEH
event.

This fix is essential for reliable EEH recovery in QEMU/KVM guests using
VFIO PCI passthrough on PowerNV and pseries systems.

Tested with:
- QEMU/KVM guest using VFIO passthrough (IBM Power9,(lpar)Power11 host)
- Injected EEH errors with pseries EEH errinjct tool on host, recovery
  verified on qemu guest.
- Verified successful config space access and CAP_EXP DevCtl restoration
  after recovery

Fixes: 212d16cdca ("powerpc/eeh: EEH support for VFIO PCI device")
Signed-off-by: Narayana Murty N <nnmlinux@linux.ibm.com>
Reviewed-by: Vaibhav Jain <vaibhav@linux.ibm.com>
Reviewed-by: Ganesh Goudar <ganeshgr@linux.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20250508062928.146043-1-nnmlinux@linux.ibm.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2025-06-27 11:07:36 +01:00
..
ptrace powerpc: Don't try to copy PPR for task with NULL pt_regs 2023-04-06 12:10:53 +02:00
syscalls syscalls: fix compat_sys_io_pgetevents_time64 usage 2024-07-05 09:31:59 +02:00
trace powerpc/64: Add support to build with prefixed instructions 2024-10-17 15:21:24 +02:00
vdso powerpc/vdso: Drop -mstack-protector-guard flags in 32-bit files with clang 2024-12-14 19:54:25 +01:00
.gitignore .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
85xx_entry_mapping.S powerpc: Remove CONFIG_FSL_BOOKE 2022-09-26 22:47:37 +10:00
align.c powerpc/inst: Define ppc_inst_t 2021-12-09 22:41:21 +11:00
asm-offsets.c powerpc/vdso: Fix VDSO data access when running in a non-root time namespace 2024-10-17 15:21:49 +02:00
audit.c Revert "powerpc/audit: Convert powerpc to AUDIT_ARCH_COMPAT_GENERIC" 2021-10-27 22:30:32 +11:00
btext.c powerpc: Fix all occurences of duplicate words 2022-07-25 12:05:15 +10:00
cacheinfo.c powerpc: Remove asm/prom.h from all files that don't need it 2022-05-08 22:15:04 +10:00
cacheinfo.h powerpc/cacheinfo: add cacheinfo_teardown, cacheinfo_rebuild 2019-06-15 16:52:06 +10:00
compat_audit.c Revert "powerpc/audit: Convert powerpc to AUDIT_ARCH_COMPAT_GENERIC" 2021-10-27 22:30:32 +11:00
cpu_setup_6xx.S powerpc/32: Blacklist functions running with MMU disabled for kprobe 2020-06-02 20:59:11 +10:00
cpu_setup_44x.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
cpu_setup_e500.S powerpc: Remove CONFIG_PPC_BOOK3E_MMU 2022-09-26 23:00:14 +10:00
cpu_setup_pa6t.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 333 2019-06-05 17:37:06 +02:00
cpu_setup_power.c powerpc/cputable: Move __cpu_setup() prototypes out of cputable.h 2022-09-26 22:26:49 +10:00
cpu_setup_ppc970.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
cpu_specs.h powerpc/cputable: Split cpu_specs[] for mpc85xx and e500mc 2022-09-26 23:00:05 +10:00
cpu_specs_8xx.h powerpc/cputable: Split cpu_specs[] out of cputable.h 2022-09-26 22:47:13 +10:00
cpu_specs_40x.h powerpc/cputable: Split cpu_specs[] out of cputable.h 2022-09-26 22:47:13 +10:00
cpu_specs_44x.h powerpc/cputable: Split cpu_specs[] out of cputable.h 2022-09-26 22:47:13 +10:00
cpu_specs_47x.h powerpc/cputable: Split cpu_specs[] out of cputable.h 2022-09-26 22:47:13 +10:00
cpu_specs_85xx.h powerpc/cputable: Split cpu_specs[] for mpc85xx and e500mc 2022-09-26 23:00:05 +10:00
cpu_specs_book3s_32.h powerpc/cputable: Split cpu_specs[] out of cputable.h 2022-09-26 22:47:13 +10:00
cpu_specs_book3s_64.h powerpc/cputable: Split cpu_specs[] out of cputable.h 2022-09-26 22:47:13 +10:00
cpu_specs_e500mc.h powerpc/cputable: Add missing PPC_FEATURE_BOOKE on PPC64 Book-E 2024-02-23 09:12:43 +01:00
cputable.c powerpc/cputable: Split cpu_specs[] out of cputable.h 2022-09-26 22:47:13 +10:00
crash_dump.c powerpc updates for 5.19 2022-05-28 11:27:17 -07:00
dawr.c powerpc: Include asm/firmware.h in all users of firmware_has_feature() 2022-06-29 16:45:05 +10:00
dbell.c powerpc/64: Fix perf profiling asynchronous interrupt handlers 2023-02-22 12:59:43 +01:00
dma-iommu.c powerpc/iommu: Incorrect DDW Table is referenced for SR-IOV device 2023-05-24 17:32:52 +01:00
dma-mask.c dma-mapping, powerpc: simplify the arch dma_set_mask override 2019-02-18 22:41:03 +11:00
dma-swiotlb.c swiotlb: add a SWIOTLB_ANY flag to lift the low memory restriction 2022-04-18 07:21:12 +02:00
dt_cpu_ftrs.c powerpc: move from strlcpy with unused retval to strscpy 2022-08-26 11:02:20 +10:00
early_32.c powerpc: Move C prototypes out of asm-prototypes.h 2022-03-08 22:06:25 +11:00
eeh.c powerpc/eeh: Fix missing PE bridge reconfiguration during VFIO EEH recovery 2025-06-27 11:07:36 +01:00
eeh_cache.c powerpc/kernel: Add __init attribute to eligible functions 2021-12-23 22:33:10 +11:00
eeh_driver.c powerpc: Fix all occurences of duplicate words 2022-07-25 12:05:15 +10:00
eeh_event.c powerpc: fix typos in comments 2022-05-05 22:12:44 +10:00
eeh_pe.c powerpc/eeh: avoid possible crash when edev->pdev changes 2024-07-25 09:49:17 +02:00
eeh_sysfs.c powerpc: Add missing headers 2022-05-08 22:15:40 +10:00
entry_32.S powerpc/47x: Fix 47x syscall return crash 2023-10-19 23:08:56 +02:00
entry_64.S powerpc: Remove CONFIG_PPC_BOOK3E 2022-09-26 23:00:13 +10:00
epapr_hcalls.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
epapr_paravirt.c powerpc/inst: Define ppc_inst_t 2021-12-09 22:41:21 +11:00
exceptions-64e.S powerpc/64/interrupt: Prevent NMI PMI causing a dangerous warning 2022-10-18 22:46:19 +11:00
exceptions-64s.S powerpc/64s/interrupt: Perf NMI should not take normal exit path 2022-10-18 22:46:19 +11:00
fadump.c powerpc/fadump: Move fadump_cma_init to setup_arch() after initmem_init() 2024-12-14 19:53:36 +01:00
firmware.c powerpc: fix unbalanced node refcount in check_kvm_guest() 2021-10-09 00:15:59 +11:00
fpu.S powerpc: Don't clobber f0/vs0 during fp|altivec register save 2023-12-08 08:51:15 +01:00
head_8xx.S powerpc/8xx: Fix kernel vs user address comparison 2024-10-17 15:20:53 +02:00
head_32.h powerpc updates for 5.17 2022-01-14 15:17:26 +01:00
head_40x.S powerpc/32: Remove _ENTRY() macro 2022-02-07 21:03:10 +11:00
head_44x.S powerpc/32: Remove _ENTRY() macro 2022-02-07 21:03:10 +11:00
head_64.S bitmap patches for v6.1-rc1 2022-10-10 12:49:34 -07:00
head_85xx.S powerpc/85xx: Fix math emulation exception 2023-11-08 14:10:58 +01:00
head_book3s_32.S powerpc/32: Set an IBAT covering up to _einittext during init 2022-07-27 21:36:05 +10:00
head_booke.h powerpc: Remove CONFIG_PPC_BOOK3E_MMU 2022-09-26 23:00:14 +10:00
hw_breakpoint.c powerpc/watchpoints: Annotate atomic context in more places 2023-10-06 14:56:57 +02:00
hw_breakpoint_constraints.c powerpc/watchpoint: Disable pagefaults when getting user instruction 2023-10-06 14:56:57 +02:00
idle.c powerpc/idle: Fix return value of __setup() handler 2022-05-04 19:37:46 +10:00
idle_6xx.S powerpc/mm: Switch obsolete dssall to .long 2021-12-23 22:35:13 +11:00
idle_64e.S powerpc: add ISA v3.0 / v3.1 wait opcode macro 2022-09-28 19:22:10 +10:00
idle_85xx.S powerpc: Cleanup idle for e500 2022-09-26 23:00:14 +10:00
idle_book3s.S powerpc/idle: Don't corrupt back chain when going idle 2021-10-20 21:37:58 +11:00
ima_arch.c powerpc/ima: Fix secure boot rules in ima arch policy 2020-05-07 17:25:54 +10:00
interrupt.c powerpc/interrupt: Don't read MSR from interrupt_exit_kernel_prepare() 2023-07-19 16:21:37 +02:00
interrupt_64.S powerpc/64: Set task pt_regs->link to the LR value on scv entry 2024-02-23 09:12:42 +01:00
io-workarounds.c powerpc: Fix reverse map real-mode address lookup with huge vmalloc 2021-05-28 22:54:27 +10:00
io.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
iomap.c powerpc: inline iomap accessors 2020-12-04 01:01:09 +11:00
iommu.c powerpc/iommu: Fix notifiers being shared by PCI and VIO buses 2023-09-13 09:42:48 +02:00
irq.c powerpc/64: Fix perf profiling asynchronous interrupt handlers 2023-02-22 12:59:43 +01:00
irq_64.c work around gcc bugs with 'asm goto' with outputs 2024-02-23 09:12:28 +01:00
isa-bridge.c powerpc: Add missing headers 2022-05-08 22:15:40 +10:00
jump_label.c powerpc: Don't use 'struct ppc_inst' to reference instruction location 2021-06-17 00:09:00 +10:00
kdebugfs.c powerpc: rename powerpc_debugfs_root to arch_debugfs_dir 2021-08-13 22:04:26 +10:00
kgdb.c powerpc: Remove CONFIG_FSL_BOOKE 2022-09-26 22:47:37 +10:00
kprobes-ftrace.c ftrace: disable preemption when recursion locked 2021-10-27 11:21:49 -04:00
kprobes.c powerpc/kprobes: Fix null pointer reference in arch_prepare_kprobe() 2022-09-28 22:19:52 +10:00
kvm.c powerpc: Remove CONFIG_PPC_BOOK3E_MMU 2022-09-26 23:00:14 +10:00
kvm_emul.S powerpc/kvm: Add ifdefs around template code 2019-09-14 00:04:40 +10:00
l2cr_6xx.S powerpc/mm: Switch obsolete dssall to .long 2021-12-23 22:35:13 +11:00
legacy_serial.c powerpc/kernel: Add missing of_node_put() in legacy_serial.c 2022-09-05 17:28:26 +10:00
Makefile powerpc/32: fix syscall wrappers with 64-bit arguments of unaligned register-pairs 2022-10-13 00:49:58 +11:00
mce.c powerpc/mce: use early_cpu_to_node() in mce_init() 2022-07-27 21:36:04 +10:00
mce_power.c powerpc/inst: Define ppc_inst_t 2021-12-09 22:41:21 +11:00
misc.S powerpc: Avoid link stack corruption in misc asm functions 2021-08-25 13:35:47 +10:00
misc_32.S powerpc: Avoid link stack corruption in misc asm functions 2021-08-25 13:35:47 +10:00
misc_64.S powerpc: Remove CONFIG_PPC_BOOK3E 2022-09-26 23:00:13 +10:00
module.c powerpc: Replace PPC64_ELF_ABI_v{1/2} by CONFIG_PPC64_ELF_ABI_V{1/2} 2022-05-19 23:11:29 +10:00
module_32.c powerpc/modules: Use PPC_LI macros instead of opencoding 2022-05-22 15:58:27 +10:00
module_64.c powerpc/modules: Use PPC_LI macros instead of opencoding 2022-05-22 15:58:27 +10:00
msi.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
note.S powerpc: Add PowerPC Capabilities ELF note 2019-08-30 09:40:15 +10:00
nvram_64.c powerpc: Add missing headers 2022-05-08 22:15:40 +10:00
of_platform.c powerpc/eeh: Remove eeh_dev_phb_init_dynamic() 2020-07-26 23:34:19 +10:00
optprobes.c powerpc/inst: Define ppc_inst_t as u32 on PPC32 2021-12-09 22:41:21 +11:00
optprobes_head.S powerpc/64: provide a helper macro to load r2 with the kernel TOC 2022-09-28 19:22:12 +10:00
paca.c powerpc: Remove CONFIG_PPC_BOOK3E 2022-09-26 23:00:13 +10:00
pci-common.c powerpc/pci-common: Fix refcount bug for 'phb->dn' 2022-09-05 17:30:29 +10:00
pci-hotplug.c powerpc: Add missing headers 2022-05-08 22:15:40 +10:00
pci_32.c powerpc/pci: Enable PCI domains in /proc when PCI bus numbers are not unique 2022-08-25 17:47:08 +10:00
pci_64.c powerpc/pci: Hide pci_device_from_OF_node() for non-powermac code 2022-07-27 21:36:03 +10:00
pci_dn.c powerpc/pci_dn: Add missing of_node_put() 2022-09-05 17:30:25 +10:00
pci_of_scan.c powerpc: Add missing headers 2022-05-08 22:15:40 +10:00
pmc.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
ppc_save_regs.S powerpc: update ppc_save_regs to save current r1 in pt_regs 2023-07-19 16:21:39 +02:00
proc_powerpc.c powerpc: Add missing headers 2022-05-08 22:15:40 +10:00
process.c KVM: PPC: Book3S HV: Fix KVM_RUN clobbering FP/VEC user registers 2023-12-08 08:51:15 +01:00
prom.c powerpc/prom: Add CPU info to hardware description string later 2024-08-03 08:49:20 +02:00
prom_init.c powerpc/prom_init: Fixup missing #size-cells on PowerBook6,7 2025-06-04 14:40:08 +02:00
prom_init_check.sh powerpc/64: Remove unused prom_init_toc symbols 2022-09-26 20:58:16 +10:00
prom_parse.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
reloc_32.S powerpc: Avoid link stack corruption in misc asm functions 2021-08-25 13:35:47 +10:00
reloc_64.S powerpc/64: avoid using r13 in relocate 2022-09-28 19:22:13 +10:00
rtas-proc.c powerpc: Add missing headers 2022-05-08 22:15:40 +10:00
rtas-rtc.c powerpc: Remove asm/prom.h from all files that don't need it 2022-05-08 22:15:04 +10:00
rtas.c powerpc/rtas: Prevent Spectre v1 gadget construction in sys_rtas() 2025-04-25 10:44:01 +02:00
rtas_entry.S powerpc/rtas: Fix RTAS MSR[HV] handling for Cell 2022-08-26 08:41:54 +10:00
rtas_flash.c powerpc/rtas_flash: allow user copy to flash block cache objects 2023-08-23 17:52:30 +02:00
rtas_pci.c powerpc: Add missing headers 2022-05-08 22:15:40 +10:00
rtasd.c powerpc: Remove asm/prom.h from all files that don't need it 2022-05-08 22:15:04 +10:00
secure_boot.c powerpc/pseries: Detect secure and trusted boot state of the system. 2020-07-16 14:49:53 +10:00
security.c powerpc/security: Fix Speculation_Store_Bypass reporting on Power10 2023-07-23 13:49:32 +02:00
secvar-ops.c powerpc/powernv: Add OPAL API interface to access secure variable 2019-11-13 00:33:22 +11:00
secvar-sysfs.c powerpc/secvar: fix refcount leak in format_show() 2022-03-08 22:07:41 +11:00
setup-common.c powerpc/fadump: Move fadump_cma_init to setup_arch() after initmem_init() 2024-12-14 19:53:36 +01:00
setup.h powerpc: Remove CONFIG_PPC_BOOK3E 2022-09-26 23:00:13 +10:00
setup_32.c powerpc: Change CONFIG_E500 to CONFIG_PPC_E500 2022-09-26 23:00:13 +10:00
setup_64.c powerpc/pseries: Fix KVM guest detection for disabling hardlockup detector 2024-12-14 19:53:58 +01:00
signal.c powerpc/signal: Report minimum signal frame size to userspace via AT_MINSIGSTKSZ 2022-05-19 23:11:26 +10:00
signal.h powerpc: Don't add __powerpc_ prefix to syscall entry points 2022-10-07 00:59:54 +11:00
signal_32.c powerpc/signal32: Force inlining of __unsafe_save_user_regs() and save_tm_user_regs_unsafe() 2023-07-19 16:21:37 +02:00
signal_64.c powerpc/signal: Update comment for clarity 2022-07-28 16:22:14 +10:00
smp-tbsync.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
smp.c powerpc/smp: poll cpu_callin_map more aggressively in __cpu_up() 2022-09-28 19:22:14 +10:00
stacktrace.c kprobes: treewide: Make it harder to refer kretprobe_trampoline directly 2021-09-30 21:24:06 -04:00
static_call.c powerpc/32: Add support for out-of-line static calls 2021-10-22 15:22:05 +11:00
suspend.c PM: hibernate: powerpc: Expose pfn_is_nosave() prototype 2019-06-14 10:48:56 +02:00
swsusp.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
swsusp_32.S powerpc/mm: Switch obsolete dssall to .long 2021-12-23 22:35:13 +11:00
swsusp_64.c powerpc/machdep: Remove stale functions from ppc_md structure 2021-10-22 15:22:05 +11:00
swsusp_85xx.S powerpc: Remove CONFIG_FSL_BOOKE 2022-09-26 22:47:37 +10:00
swsusp_asm64.S powerpc/64: asm use consistent global variable declaration and access 2022-09-28 19:22:12 +10:00
sys_ppc32.c powerpc/32: fix syscall wrappers with 64-bit arguments 2022-11-01 10:24:09 +11:00
syscall.c powerpc: Provide syscall wrapper 2022-09-28 19:22:09 +10:00
syscalls.c powerpc: Adopt SYSCALL_DEFINE for arch-specific syscall handlers 2022-09-28 19:22:08 +10:00
sysfs.c powerpc: Remove CONFIG_PPC_FSL_BOOK3E 2022-09-26 23:00:13 +10:00
systbl.c powerpc: Don't add __powerpc_ prefix to syscall entry points 2022-10-07 00:59:54 +11:00
tau_6xx.c powerpc: Move C prototypes out of asm-prototypes.h 2022-03-08 22:06:25 +11:00
time.c powerpc/kcsan: Exclude udelay to prevent recursive instrumentation 2023-03-17 08:50:31 +01:00
tm.S powerpc/tm: Fix more userspace r13 corruption 2022-03-16 11:59:24 +11:00
traps.c powerpc: Fix build error due to is_valid_bugaddr() 2024-02-05 20:12:46 +00:00
ucall.S powerpc/kernel: Add ucall_norets() ultravisor call handler 2019-08-30 09:40:15 +10:00
udbg.c powerpc: Add support for early debugging via Serial 16550 console 2022-09-28 19:22:09 +10:00
udbg_16550.c powerpc: Add support for early debugging via Serial 16550 console 2022-09-28 19:22:09 +10:00
uprobes.c powerpc: Reject probes on instructions that can't be single stepped 2022-05-06 00:00:20 +10:00
vdso.c - Yu Zhao's Multi-Gen LRU patches are here. They've been under test in 2022-10-10 17:53:04 -07:00
vdso32_wrapper.S powerpc/vdso: Merge vdso64 and vdso32 into a single directory 2022-02-12 22:47:43 +11:00
vdso64_wrapper.S powerpc/vdso: Merge vdso64 and vdso32 into a single directory 2022-02-12 22:47:43 +11:00
vecemu.c powerpc/inst: Define ppc_inst_t 2021-12-09 22:41:21 +11:00
vector.S powerpc: Don't clobber f0/vs0 during fp|altivec register save 2023-12-08 08:51:15 +01:00
vmlinux.lds.S powerpc/vmlinux.lds: Don't discard .rela* for relocatable builds 2023-02-25 11:25:42 +01:00
watchdog.c powerpc/watchdog: introduce a NMI watchdog's factor 2022-07-27 21:36:02 +10:00