rtas_entry.S - OpenGrok history log for /linux-6.15/arch/powerpc/kernel/rtas

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Revision tags: v6.15, v6.15-rc7, v6.15-rc6, v6.15-rc5, v6.15-rc4, v6.15-rc3, v6.15-rc2, v6.15-rc1, v6.14, v6.14-rc7, v6.14-rc6, v6.14-rc5, v6.14-rc4, v6.14-rc3, v6.14-rc2, v6.14-rc1, v6.13, v6.13-rc7, v6.13-rc6, v6.13-rc5, v6.13-rc4, v6.13-rc3, v6.13-rc2, v6.13-rc1, v6.12, v6.12-rc7, v6.12-rc6, v6.12-rc5, v6.12-rc4, v6.12-rc3, v6.12-rc2, v6.12-rc1, v6.11, v6.11-rc7, v6.11-rc6, v6.11-rc5, v6.11-rc4, v6.11-rc3, v6.11-rc2, v6.11-rc1, v6.10, v6.10-rc7, v6.10-rc6, v6.10-rc5, v6.10-rc4, v6.10-rc3, v6.10-rc2, v6.10-rc1, v6.9, v6.9-rc7, v6.9-rc6, v6.9-rc5, v6.9-rc4, v6.9-rc3, v6.9-rc2, v6.9-rc1, v6.8, v6.8-rc7, v6.8-rc6, v6.8-rc5, v6.8-rc4, v6.8-rc3, v6.8-rc2, v6.8-rc1, v6.7, v6.7-rc8, v6.7-rc7, v6.7-rc6, v6.7-rc5, v6.7-rc4, v6.7-rc3, v6.7-rc2, v6.7-rc1, v6.6, v6.6-rc7, v6.6-rc6, v6.6-rc5, v6.6-rc4, v6.6-rc3, v6.6-rc2, v6.6-rc1, v6.5, v6.5-rc7, v6.5-rc6, v6.5-rc5, v6.5-rc4, v6.5-rc3, v6.5-rc2, v6.5-rc1, v6.4, v6.4-rc7, v6.4-rc6, v6.4-rc5, v6.4-rc4, v6.4-rc3, v6.4-rc2, v6.4-rc1, v6.3, v6.3-rc7, v6.3-rc6, v6.3-rc5, v6.3-rc4, v6.3-rc3, v6.3-rc2, v6.3-rc1, v6.2, v6.2-rc8, v6.2-rc7, v6.2-rc6, v6.2-rc5, v6.2-rc4, v6.2-rc3, v6.2-rc2, v6.2-rc1, v6.1, v6.1-rc8, v6.1-rc7, v6.1-rc6, v6.1-rc5, v6.1-rc4, v6.1-rc3, v6.1-rc2, v6.1-rc1, v6.0, v6.0-rc7, v6.0-rc6, v6.0-rc5, v6.0-rc4, v6.0-rc3
# 91926d8b	23-Aug-2022	Michael Ellerman <[email protected]>	powerpc/rtas: Fix RTAS MSR[HV] handling for Cell The semi-recent changes to MSR handling when entering RTAS (firmware) cause crashes on IBM Cell machines. An example trace: kernel tried to execut powerpc/rtas: Fix RTAS MSR[HV] handling for Cell The semi-recent changes to MSR handling when entering RTAS (firmware) cause crashes on IBM Cell machines. An example trace: kernel tried to execute user page (2fff01a8) - exploit attempt? (uid: 0) BUG: Unable to handle kernel instruction fetch Faulting instruction address: 0x2fff01a8 Oops: Kernel access of bad area, sig: 11 [#1] BE PAGE_SIZE=64K MMU=Hash SMP NR_CPUS=4 NUMA Cell Modules linked in: CPU: 0 PID: 0 Comm: swapper/0 Tainted: G W 6.0.0-rc2-00433-gede0a8d3307a #207 NIP: 000000002fff01a8 LR: 0000000000032608 CTR: 0000000000000000 REGS: c0000000015236b0 TRAP: 0400 Tainted: G W (6.0.0-rc2-00433-gede0a8d3307a) MSR: 0000000008001002 <ME,RI> CR: 00000000 XER: 20000000 ... NIP 0x2fff01a8 LR 0x32608 Call Trace: 0xc00000000143c5f8 (unreliable) .rtas_call+0x224/0x320 .rtas_get_boot_time+0x70/0x150 .read_persistent_clock64+0x114/0x140 .read_persistent_wall_and_boot_offset+0x24/0x80 .timekeeping_init+0x40/0x29c .start_kernel+0x674/0x8f0 start_here_common+0x1c/0x50 Unlike PAPR platforms where RTAS is only used in guests, on the IBM Cell machines Linux runs with MSR[HV] set but also uses RTAS, provided by SLOF. Fix it by copying the MSR[HV] bit from the MSR value we've just read using mfmsr into the value used for RTAS. It seems like we could also fix it using an #ifdef CELL to set MSR[HV], but that doesn't work because it's possible to build a single kernel image that runs on both Cell native and pseries. Fixes: b6b1c3ce06ca ("powerpc/rtas: Keep MSR[RI] set when calling RTAS") Cc: [email protected] # v5.19+ Signed-off-by: Michael Ellerman <[email protected]> Reviewed-by: Jordan Niethe <[email protected]> Link: https://lore.kernel.org/r/[email protected] show more ...
Revision tags: v6.0-rc2, v6.0-rc1, v5.19, v5.19-rc8, v5.19-rc7, v5.19-rc6, v5.19-rc5, v5.19-rc4, v5.19-rc3, v5.19-rc2, v5.19-rc1, v5.18, v5.18-rc7, v5.18-rc6, v5.18-rc5, v5.18-rc4, v5.18-rc3, v5.18-rc2, v5.18-rc1, v5.17, v5.17-rc8
# 014b2e89	08-Mar-2022	Nicholas Piggin <[email protected]>	powerpc/rtas: Leave MSR[RI] enabled over RTAS call PAPR specifies that RTAS may be called with MSR[RI] enabled if the calling context is recoverable, and RTAS will manage RI as necessary. Call the r powerpc/rtas: Leave MSR[RI] enabled over RTAS call PAPR specifies that RTAS may be called with MSR[RI] enabled if the calling context is recoverable, and RTAS will manage RI as necessary. Call the rtas entry point with RI enabled, and add a check to ensure the caller has RI enabled. Signed-off-by: Nicholas Piggin <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/[email protected] show more ...
# 5c86bd02	08-Mar-2022	Nicholas Piggin <[email protected]>	powerpc/rtas: PACA can be restored directly from SPRG On 64-bit, PACA is saved in a SPRG so it does not need to be saved on stack. We also don't need to mask off the top bits for real mode addresses powerpc/rtas: PACA can be restored directly from SPRG On 64-bit, PACA is saved in a SPRG so it does not need to be saved on stack. We also don't need to mask off the top bits for real mode addresses because the architecture does this for us. Signed-off-by: Nicholas Piggin <[email protected]> Reviewed-by: Laurent Dufour <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/[email protected] show more ...
# c5a65e0a	08-Mar-2022	Nicholas Piggin <[email protected]>	powerpc/rtas: Call enter_rtas with MSR[EE] disabled Disable MSR[EE] in C code rather than asm. Signed-off-by: Nicholas Piggin <[email protected]> Reviewed-by: Laurent Dufour <[email protected]> powerpc/rtas: Call enter_rtas with MSR[EE] disabled Disable MSR[EE] in C code rather than asm. Signed-off-by: Nicholas Piggin <[email protected]> Reviewed-by: Laurent Dufour <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/[email protected] show more ...
# 4e949faa	08-Mar-2022	Nicholas Piggin <[email protected]>	powerpc/rtas: Fix whitespace in rtas_entry.S The code was moved verbatim including whitespace cruft. Fix that. Signed-off-by: Nicholas Piggin <[email protected]> Signed-off-by: Michael Ellerman <mp powerpc/rtas: Fix whitespace in rtas_entry.S The code was moved verbatim including whitespace cruft. Fix that. Signed-off-by: Nicholas Piggin <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/[email protected] show more ...
# 07940b4b	08-Mar-2022	Nicholas Piggin <[email protected]>	powerpc/rtas: Make enter_rtas a nokprobe symbol on 64-bit This symbol is marked nokprobe on 32-bit but not 64-bit, add it. Signed-off-by: Nicholas Piggin <[email protected]> Signed-off-by: Michael powerpc/rtas: Make enter_rtas a nokprobe symbol on 64-bit This symbol is marked nokprobe on 32-bit but not 64-bit, add it. Signed-off-by: Nicholas Piggin <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/[email protected] show more ...
# 838ee286	08-Mar-2022	Nicholas Piggin <[email protected]>	powerpc/rtas: Move rtas entry assembly into its own file This makes working on the code a bit easier. Signed-off-by: Nicholas Piggin <[email protected]> Signed-off-by: Michael Ellerman <mpe@ellerma powerpc/rtas: Move rtas entry assembly into its own file This makes working on the code a bit easier. Signed-off-by: Nicholas Piggin <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/[email protected] show more ...