- 29 Jul, 2020 40 commits
-
-
Hari Bathini authored
While initrd, elfcorehdr and backup regions are already added to the reserve map, there are a few missing regions that need to be added to the memory reserve map. Add them here. And now that all the changes to load panic kernel are in place, claim likewise. Signed-off-by:
Hari Bathini <hbathini@linux.ibm.com> Tested-by:
Pingfan Liu <piliu@redhat.com> Reviewed-by:
Thiago Jung Bauermann <bauerman@linux.ibm.com> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/159602300473.575379.4218568032039284448.stgit@hbathini
-
Hari Bathini authored
Prepare elf headers for the crashing kernel's core file using crash_prepare_elf64_headers() and pass on this info to kdump kernel by updating its command line with elfcorehdr parameter. Also, add elfcorehdr location to reserve map to avoid it from being stomped on while booting. Signed-off-by:
-
Hari Bathini authored
Though kdump kernel boots from loaded address, the first 64KB of it is copied down to real 0. So, setup a backup region and let purgatory copy the first 64KB of crashed kernel into this backup region before booting into kdump kernel. Update reserve map with backup region and crashed kernel's memory to avoid kdump kernel from accidentially using that memory. Signed-off-by:
-
Hari Bathini authored
Kdump kernel, used for capturing the kernel core image, is supposed to use only specific memory regions to avoid corrupting the image to be captured. The regions are crashkernel range - the memory reserved explicitly for kdump kernel, memory used for the tce-table, the OPAL region and RTAS region as applicable. Restrict kdump kernel memory to use only these regions by setting up usable-memory DT property. Also, tell the kdump kernel to run at the loaded address by setting the magic word at 0x5c. Signed-off-by:
-
Hari Bathini authored
Currently, numa & prom are the only users of drmem LMB walk code. Loading kdump with kexec_file also needs to walk the drmem LMBs to setup the usable memory ranges for kdump kernel. But there are couple of issues in using the code as is. One, walk_drmem_lmb() code is built into the .init section currently, while kexec_file needs it later. Two, there is no scope to pass data to the callback function for processing and/or erroring out on certain conditions. Fix that by, moving drmem LMB walk code out of .init section, adding scope to pass data to the callback function and bailing out when an error is encountered in the callback function. Signed-off-by:
-
Hari Bathini authored
crashkernel region could have an overlap with special memory regions like OPAL, RTAS, TCE table & such. These regions are referred to as excluded memory ranges. Setup these ranges during image probe in order to avoid them while finding the buffer for different kdump segments. Override arch_kexec_locate_mem_hole() to locate a memory hole taking these ranges into account. Signed-off-by:
-
Hari Bathini authored
In kexec case, the kernel to be loaded uses the same memory layout as the running kernel. So, passing on the DT of the running kernel would be good enough. But in case of kdump, different memory ranges are needed to manage loading the kdump kernel, booting into it and exporting the elfcore of the crashing kernel. The ranges are exclude memory ranges, usable memory ranges, reserved memory ranges and crash memory ranges. Exclude memory ranges specify the list of memory ranges to avoid while loading kdump segments. Usable memory ranges list the memory ranges that could be used for booting kdump kernel. Reserved memory ranges list the memory regions for the loading kernel's reserve map. Crash memory ranges list the memory ranges to be exported as the crashing kernel's elfcore. Add helper functions for setting up the above mentioned memory ranges. This helpers facilitate in understanding the subsequent changes better and make it easy to setup the different memory ranges listed above, as and when appropriate. Signed-off-by:
-
Hari Bathini authored
Some of the kexec_file_load code isn't PPC64 specific. Move PPC64 specific code from kexec/file_load.c to kexec/file_load_64.c. Also, rename purgatory/trampoline.S to purgatory/trampoline_64.S in the same spirit. No functional changes. Signed-off-by:
Laurent Dufour <ldufour@linux.ibm.com> Reviewed-by:
-
Hari Bathini authored
Some architectures may have special memory regions, within the given memory range, which can't be used for the buffer in a kexec segment. Implement weak arch_kexec_locate_mem_hole() definition which arch code may override, to take care of special regions, while trying to locate a memory hole. Also, add the missing declarations for arch overridable functions and and drop the __weak descriptors in the declarations to avoid non-weak definitions from becoming weak. Signed-off-by:
Dave Young <dyoung@redhat.com> Signed-off-by:
-
Anton Blanchard authored
I've forgotten to manually enable NVME when building pseries kernels for machines with NVME adapters. Since it's a reasonably common configuration, enable it by default. Signed-off-by:
Anton Blanchard <anton@ozlabs.org> Signed-off-by:
-
Mahesh Salgaonkar authored
With the proposed change in percpu bootmem allocator to use page mapping [1], the percpu first chunk memory area can come from vmalloc ranges. This makes the HMI (Hypervisor Maintenance Interrupt) handler crash the kernel whenever percpu variable is accessed in real mode. This patch fixes this issue by moving the HMI IRQ stat inside paca for safe access in realmode. [1] https://lore.kernel.org/linuxppc-dev/20200608070904.387440-1-aneesh.kumar@linux.ibm.com/Suggested-by:
Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Signed-off-by:
Mahesh Salgaonkar <mahesh@linux.ibm.com> Signed-off-by:
-
David Lamparter authored
This just adds the zl2006 voltage regulators / power monitors and the onboard I2C eeproms. The ICS9FG108 clock chip doesn't seem to have a driver, so it is left in the DTS as a comment. And for good measure, the SPD eeproms are tagged as such. Signed-off-by:
David Lamparter <equinox@diac24.net> Signed-off-by:
-
Alastair D'Silva authored
This patch addresses warnings and errors from the kernel doc scripts for the OpenCAPI driver. It also makes minor tweaks to make the docs more consistent. Signed-off-by:
Alastair D'Silva <alastair@d-silva.org> Acked-by:
Andrew Donnellan <ajd@linux.ibm.com> Signed-off-by:
-
Alastair D'Silva authored
Function declarations don't need externs, remove the existing ones so they are consistent with newer code Signed-off-by:
Frederic Barrat <fbarrat@linux.ibm.com> Signed-off-by:
-
Thadeu Lima de Souza Cascardo authored
When running under older versions of qemu of under newer versions with old machine types, some security features will not be reported to the guest. This will lead the guest OS to consider itself Vulnerable to spectre_v2. So, spectre_v2 test fails in such cases when the host is mitigated and miss predictions cannot be detected as expected by the test. Make it return the skip code instead, for this particular case. We don't want to miss the case when the test fails and the system reports as mitigated or not affected. But it is not a problem to miss failures when the system reports as Vulnerable. Signed-off-by:
Thadeu Lima de Souza Cascardo <cascardo@canonical.com> Signed-off-by:
-
Balamuruhan S authored
Add testcases for divde, divde., divdeu, divdeu. emulated instructions to cover few scenarios, - with same dividend and divisor to have undefine RT for divdeu[.] - with divide by zero to have undefine RT for both divde[.] and divdeu[.] - with negative dividend to cover -|divisor| < r <= 0 if the dividend is negative for divde[.] - normal case with proper dividend and divisor for both divde[.] and divdeu[.] Signed-off-by:Balamuruhan S <bala24@linux.ibm.com> Reviewed-by:
Sandipan Das <sandipan@linux.ibm.com> Acked-by:
Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> Signed-off-by:
-
Balamuruhan S authored
This patch adds emulation support for divde, divdeu instructions, - Divide Doubleword Extended (divde[.]) - Divide Doubleword Extended Unsigned (divdeu[.]) Signed-off-by:
-
Balamuruhan S authored
Include instruction opcodes for divde and divdeu as macros. Signed-off-by:
-
Harish authored
On systems with large number of cpus, test fails trying to set affinity by calling sched_setaffinity() with smaller size for affinity mask. This patch fixes it by making sure that the size of allocated affinity mask is dependent on the number of CPUs as reported by get_nprocs(). Fixes: 00b7ec5c ("selftests/powerpc: Import Anton's context_switch2 benchmark") Reported-by:
Shirisha Ganta <shiganta@in.ibm.com> Signed-off-by:
Harish <harish@linux.ibm.com> Reviewed-by:
Kamalesh Babulal <kamalesh@linux.vnet.ibm.com> Reviewed-by:
Satheesh Rajendran <sathnaga@linux.vnet.ibm.com> Signed-off-by:
-
Wei Yongjun authored
Gcc report warning as follows: arch/powerpc/platforms/powernv/pci-sriov.c:602:25: warning: variable 'phb' set but not used [-Wunused-but-set-variable] 602 | struct pnv_phb *phb; | ^~~ This variable is not used, so this commit removing it. Reported-by:Hulk Robot <hulkci@huawei.com> Signed-off-by:
Wei Yongjun <weiyongjun1@huawei.com> Acked-by:
Oliver O'Halloran <oohall@gmail.com> Signed-off-by:
-
Qinglang Miao authored
Use for_each_child_of_node() macro instead of open coding it. Signed-off-by:
Qinglang Miao <miaoqinglang@huawei.com> Signed-off-by:
-
Nicholas Piggin authored
Signed-off-by:
Nicholas Piggin <npiggin@gmail.com> Signed-off-by:
-
Gustavo A. R. Silva authored
Replace the existing /* fall through */ comments and its variants with the new pseudo-keyword macro fallthrough[1]. Also, remove unnecessary fall-through markings when it is the case. [1] https://www.kernel.org/doc/html/v5.7/process/deprecated.html?highlight=fallthrough#implicit-switch-case-fall-throughSigned-off-by:
Gustavo A. R. Silva <gustavoars@kernel.org> Signed-off-by:
-
Aneesh Kumar K.V authored
This adds a kernel command line option that can be used to disable GTSE support. Disabling GTSE implies kernel will make hcalls to invalidate TLB entries. This was done so that we can do VM migration between configs that enable/disable GTSE support via hypervisor. To migrate a VM from a system that supports GTSE to a system that doesn't, we can boot the guest with radix_hcall_invalidate=on, thereby forcing the guest to use hcalls for TLB invalidates. The check for hcall availability is done in pSeries_setup_arch so that the panic message appears on the console. This should only happen on a hypervisor that doesn't force the guest to hash translation even though it can't handle the radix GTSE=0 request via CAS. With radix_hcall_invalidate=on if the hypervisor doesn't support hcall_rpt_invalidate hcall it should force the LPAR to hash translation. Signed-off-by:
Bharata B Rao <bharata@linux.ibm.com> Signed-off-by:
-
Aneesh Kumar K.V authored
Current kernel gives: [ 0.000000] cma: Reserved 26224 MiB at 0x0000007959000000 [ 0.000000] hugetlb_cma: reserve 65536 MiB, up to 16384 MiB per node [ 0.000000] cma: Reserved 16384 MiB at 0x0000001800000000 With the fix [ 0.000000] kvm_cma_reserve: reserving 26214 MiB for global area [ 0.000000] cma: Reserved 26224 MiB at 0x0000007959000000 [ 0.000000] hugetlb_cma: reserve 65536 MiB, up to 16384 MiB per node [ 0.000000] cma: Reserved 16384 MiB at 0x0000001800000000 Signed-off-by:
-
Aneesh Kumar K.V authored
commit: cf11e85f ("mm: hugetlb: optionally allocate gigantic hugepages using cma") added support for allocating gigantic hugepages using CMA. This patch enables the same for powerpc Signed-off-by:
-
Balamuruhan S authored
Data Cache Block Invalidate (dcbi) instruction implemented back in PowerPC architecture version 2.03. But as per Power Processor Users Manual it is obsolete and not supported by POWER8/POWER9 core. Attempt to use of this illegal instruction results in a hypervisor emulation assistance interrupt. So, ifdef it out the option `i` in xmon for 64bit Book3S. 0:mon> fi cpu 0x0: Vector: 700 (Program Check) at [c000000003be74a0] pc: c000000000102030: cacheflush+0x180/0x1a0 lr: c000000000101f3c: cacheflush+0x8c/0x1a0 sp: c000000003be7730 msr: 8000000000081033 current = 0xc0000000035e5c00 paca = 0xc000000001910000 irqmask: 0x03 irq_happened: 0x01 pid = 1025, comm = bash Linux version 5.6.0-rc5-g5aa19adac (root@ltc-wspoon6) (gcc version 7.4.0 (Ubuntu 7.4.0-1ubuntu1~18.04.1)) #1 SMP Tue Mar 10 04:38:41 CDT 2020 cpu 0x0: Exception 700 (Program Check) in xmon, returning to main loop [c000000003be7c50] c00000000084abb0 __handle_sysrq+0xf0/0x2a0 [c000000003be7d00] c00000000084b3c0 write_sysrq_trigger+0xb0/0xe0 [c000000003be7d30] c0000000004d1edc proc_reg_write+0x8c/0x130 [c000000003be7d60] c00000000040dc7c __vfs_write+0x3c/0x70 [c000000003be7d80] c000000000410e70 vfs_write+0xd0/0x210 [c000000003be7dd0] c00000000041126c ksys_write+0xdc/0x130 [c000000003be7e20] c00000000000b9d0 system_call+0x5c/0x68 --- Exception: c01 (System Call) at 00007fffa345e420 SP (7ffff0b08ab0) is in userspace Signed-off-by: -
Michael Ellerman authored
There's a comment in time.h referring to CONFIG_POWER, which doesn't exist. That confuses scripts/checkkconfigsymbols.py. Presumably the comment was referring to a CONFIG_POWER vs CONFIG_PPC, in which case for CONFIG_POWER we would #define __USE_RTC to 1. But instead we have CONFIG_PPC_BOOK3S_601, and these days we have IS_ENABLED(). So the comment is no longer relevant, drop it. Signed-off-by:
-
Michael Ellerman authored
This comment refers to the non-existent CONFIG_PPC_BOOK3S_XX, which confuses scripts/checkkconfigsymbols.py. Change it to use the correct symbol. Signed-off-by:
-
Michael Ellerman authored
Commit 866bfc75 ("powerpc: conditionally compile platform-specific serial drivers") made some code depend on CONFIG_PPC_MPC52XX, which doesn't exist. Fix it to use CONFIG_PPC_MPC52xx. Fixes: 866bfc75 ("powerpc: conditionally compile platform-specific serial drivers") Signed-off-by:
-
Michael Ellerman authored
All 32 and 64-bit builds that don't have CONFIG_TAU_INT enabled (all of them), get a definition of TAUException() in traps.c. On 64-bit it's completely useless, and just wastes ~120 bytes of text. On 32-bit it allows the kernel to link because head_32.S calls it unconditionally. Instead follow the example of altivec_assist_exception(), and if CONFIG_TAU_INT is not enabled just point it at unknown_exception using the preprocessor. Signed-off-by:
-
Michael Ellerman authored
We have two uses of CONFIG_BOOK3S_601, which doesn't exist. Fix them to use CONFIG_PPC_BOOK3S_601 which is the correct symbol. Fixes: 12c3f1fd ("powerpc/32s: get rid of CPU_FTR_601 feature") Signed-off-by:
-
Michael Ellerman authored
This code was merged 11 years ago in commit 13363ab9 ("powerpc: Add definitions used by exception handling on 64-bit Book3E") but was never able to be built because CONFIG_BOOK3E_MMU_TLB_STATS never existed. Remove it. Signed-off-by:
-
Michael Ellerman authored
There's a comment in lite5200_sleep.S that refers to "CONFIG_BDI*". This confuses scripts/checkkconfigsymbols.py, which thinks it should be able to find CONFIG_BDI. Change the comment to refer to CONFIG_BDI_SWITCH which is presumably roughly what it was referring to. AFAICS there never has been a CONFIG_BDI. Signed-off-by:
-
Michael Ellerman authored
Remove references to symbols that no longer exist as reported by scripts/checkkconfigsymbols.py. Signed-off-by:
-
Michael Ellerman authored
ppc6xx_defconfig refers to quite a few symbols that no longer exist, as reported by scripts/checkkconfigsymbols.py, remove them. Signed-off-by:
-
Bharata B Rao authored
During memory hotplug and unplug, resize_hpt_for_hotplug() gets called for both hash and radix guests but it should be called only for hash guests. Though the call does nothing in the radix guest case, it is cleaner to push this call into hash specific memory hotplug routines. Reported-by:
Nathan Lynch <nathanl@linux.ibm.com> Signed-off-by:
-
Michael Ellerman authored
Now that the powerpc code behaves the same as other architectures we can drop the special cases we had. Signed-off-by:
-
Michael Ellerman authored
We have powerpc specific logic in our page fault handling to decide if an access to an unmapped address below the stack pointer should expand the stack VMA. The logic aims to prevent userspace from doing bad accesses below the stack pointer. However as long as the stack is < 1MB in size, we allow all accesses without further checks. Adding some debug I see that I can do a full kernel build and LTP run, and not a single process has used more than 1MB of stack. So for the majority of processes the logic never even fires. We also recently found a nasty bug in this code which could cause userspace programs to be killed during signal delivery. It went unnoticed presumably because most processes use < 1MB of stack. The generic mm code has also grown support for stack guard pages since this code was originally written, so the most heinous case of the stack expanding into other mappings is now handled for us. Finally although some other arches have special logic in this path, from what I can tell none of x86, arm64, arm and s390 impose any extra checks other than those in expand_stack(). So drop our complicated logic and like other architectures just let the stack expand as long as its within the rlimit. Signed-off-by:
Daniel Axtens <dja@axtens.net> Link: https://lore.kernel.org/r/20200724092528.1578671-4-mpe@ellerman.id.au
-
Michael Ellerman authored
Update the stack expansion load/store test to take into account the new allowance of 4224 bytes below the stack pointer. Signed-off-by:
-
