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2020-12-04powerpc/32s: Use SPRN_SPRG_SCRATCH2 in DSI prologChristophe Leroy
Use SPRN_SPRG_SCRATCH2 as an alternative scratch register in the early part of DSI prolog in order to avoid clobbering SPRN_SPRG_SCRATCH0/1 used by other prologs. The 603 doesn't like a jump from DataLoadTLBMiss to the 10 nops that are now in the beginning of DSI exception as a result of the feature section. To workaround this, add a jump as alternative. It also avoids fetching 10 nops for nothing. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/f9f8df2a2be93568768ef1ac793639f7914cf103.1606285014.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/32: Simplify EXCEPTION_PROLOG_1 macroChristophe Leroy
Make code more readable with a clear CONFIG_VMAP_STACK section and a clear non CONFIG_VMAP_STACK section. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/c0f16cf432d22fc80097264d94649460d3dd761d.1606285014.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/603: Use SPRN_SDR1 to store the pgdir phys addressChristophe Leroy
On the 603, SDR1 is not used. In order to free SPRN_SPRG2, use SPRN_SDR1 to store the pgdir phys addr. But only some bits of SDR1 can be used (0xffff01ff). As the pgdir is 4k aligned, rotate it by 4 bits to the left. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/7370574b49d8476878ce5480726197993cb76108.1606285014.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/32s: Fix an FTR_SECTION_ELSEChristophe Leroy
An FTR_SECTION_ELSE is in the middle of BEGIN_MMU_FTR_SECTION/ALT_MMU_FTR_SECTION_END_IFSET Change it to MMU_FTR_SECTION_ELSE Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/61790f1a91692950a6bb5bb53d6d514d9bcdad74.1606285014.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/32s: Always map kernel text and rodata with BATsChristophe Leroy
Since commit 2b279c0348af ("powerpc/32s: Allow mapping with BATs with DEBUG_PAGEALLOC"), there is no real situation where mapping without BATs is required. In order to simplify memory handling, always map kernel text and rodata with BATs even when "nobats" kernel parameter is set. Also fix the 603 TLB miss exceptions that don't require anymore kernel page table if DEBUG_PAGEALLOC. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/da51f7ec632825a4ce43290a904aad61648408c0.1606285013.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/perf: MMCR0 control for PMU registers under PMCC=00Athira Rajeev
PowerISA v3.1 introduces new control bit (PMCCEXT) for restricting access to group B PMU registers in problem state when MMCR0 PMCC=0b00. In problem state and when MMCR0 PMCC=0b00, setting the Monitor Mode Control Register bit 54 (MMCR0 PMCCEXT), will restrict read permission on Group B Performance Monitor Registers (SIER, SIAR, SDAR and MMCR1). When this bit is set to zero, group B registers will be readable. In other platforms (like power9), the older behaviour is retained where group B PMU SPRs are readable. Patch adds support for MMCR0 PMCCEXT bit in power10 by enabling this bit during boot and during the PMU event enable/disable callback functions. Signed-off-by: Athira Rajeev <atrajeev@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/1606409684-1589-8-git-send-email-atrajeev@linux.vnet.ibm.com
2020-12-04powerpc/book3s64/pkeys: Optimize KUAP and KUEP feature disabled caseAneesh Kumar K.V
If FTR_BOOK3S_KUAP is disabled, kernel will continue to run with the same AMR value with which it was entered. Hence there is a high chance that we can return without restoring the AMR value. This also helps the case when applications are not using the pkey feature. In this case, different applications will have the same AMR values and hence we can avoid restoring AMR in this case too. Also avoid isync() if not really needed. Do the same for IAMR. null-syscall benchmark results: With smap/smep disabled: Without patch: 957.95 ns 2778.17 cycles With patch: 858.38 ns 2489.30 cycles With smap/smep enabled: Without patch: 1017.26 ns 2950.36 cycles With patch: 1021.51 ns 2962.44 cycles Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20201127044424.40686-23-aneesh.kumar@linux.ibm.com
2020-12-04powerpc/book3s64/pkeys: Don't update SPRN_AMR when in kernel mode.Aneesh Kumar K.V
Now that kernel correctly store/restore userspace AMR/IAMR values, avoid manipulating AMR and IAMR from the kernel on behalf of userspace. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Reviewed-by: Sandipan Das <sandipan@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20201127044424.40686-15-aneesh.kumar@linux.ibm.com
2020-12-04powerpc/ptrace-view: Use pt_regs values instead of thread_struct based one.Aneesh Kumar K.V
We will remove thread.amr/iamr/uamor in a later patch Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20201127044424.40686-14-aneesh.kumar@linux.ibm.com
2020-12-04powerpc/book3s64/pkeys: Reset userspace AMR correctly on execAneesh Kumar K.V
On fork, we inherit from the parent and on exec, we should switch to default_amr values. Also, avoid changing the AMR register value within the kernel. The kernel now runs with different AMR values. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Reviewed-by: Sandipan Das <sandipan@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20201127044424.40686-13-aneesh.kumar@linux.ibm.com
2020-12-04powerpc/book3s64/pkeys: Inherit correctly on fork.Aneesh Kumar K.V
Child thread.kuap value is inherited from the parent in copy_thread_tls. We still need to make sure when the child returns from a fork in the kernel we start with the kernel default AMR value. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Reviewed-by: Sandipan Das <sandipan@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20201127044424.40686-12-aneesh.kumar@linux.ibm.com
2020-12-04powerpc/book3s64/pkeys: Store/restore userspace AMR/IAMR correctly on entry ↵Aneesh Kumar K.V
and exit from kernel This prepare kernel to operate with a different value than userspace AMR/IAMR. For this, AMR/IAMR need to be saved and restored on entry and return from the kernel. With KUAP we modify kernel AMR when accessing user address from the kernel via copy_to/from_user interfaces. We don't need to modify IAMR value in similar fashion. If MMU_FTR_PKEY is enabled we need to save AMR/IAMR in pt_regs on entering kernel from userspace. If not we can assume that AMR/IAMR is not modified from userspace. We need to save AMR if we have MMU_FTR_BOOK3S_KUAP feature enabled and we are interrupted within kernel. This is required so that if we get interrupted within copy_to/from_user we continue with the right AMR value. If we hae MMU_FTR_BOOK3S_KUEP enabled we need to restore IAMR on return to userspace beause kernel will be running with a different IAMR value. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Reviewed-by: Sandipan Das <sandipan@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20201127044424.40686-11-aneesh.kumar@linux.ibm.com
2020-12-04powerpc/exec: Set thread.regs early during execAneesh Kumar K.V
In later patches during exec, we would like to access default regs.amr to control access to the user mapping. Having thread.regs set early makes the code changes simpler. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20201127044424.40686-10-aneesh.kumar@linux.ibm.com
2020-12-04powerpc/book3s64/kuap/kuep: Add PPC_PKEY config on book3s64Aneesh Kumar K.V
The config CONFIG_PPC_PKEY is used to select the base support that is required for PPC_MEM_KEYS, KUAP, and KUEP. Adding this dependency reduces the code complexity(in terms of #ifdefs) and enables us to move some of the initialization code to pkeys.c Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20201127044424.40686-4-aneesh.kumar@linux.ibm.com
2020-12-04powerpc/64s: Remove "Host" from MCE loggingNicholas Piggin
"Host" caused machine check is printed when the kernel sees a MCE hit in this kernel or userspace, and "Guest" if it hit one of its guests. This is confusing when a guest kernel handles a hypervisor- delivered MCE, it also prints "Host". Just remove "Host". "Guest" is adequate to make the distinction. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20201128070728.825934-8-npiggin@gmail.com
2020-12-04powerpc/64s/pseries: Add ERAT specific machine check handlerNicholas Piggin
Don't treat ERAT MCEs as SLB, don't save the SLB and use a specific ERAT flush to recover it. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20201128070728.825934-7-npiggin@gmail.com
2020-12-04powerpc/64s/powernv: Allow KVM to handle guest machine check detailsNicholas Piggin
KVM has strategies to perform machine check recovery. If a MCE hits in a guest, have the low level handler just decode and save the MCE but not try to recover anything, so KVM can deal with it. The host does not own SLBs and does not need to report the SLB state in case of a multi-hit for example, or know about the virtual memory map of the guest. UE and memory poisoning of guest pages in the host is one thing that is possibly not completely robust at the moment, but this too needs to go via KVM (possibly via the guest and back out to host via hcall) rather than being handled at a low level in the host handler. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20201128070728.825934-3-npiggin@gmail.com
2020-12-04powerpc: Reintroduce is_kvm_guest() as a fast-path checkSrikar Dronamraju
Introduce a static branch that would be set during boot if the OS happens to be a KVM guest. Subsequent checks to see if we are on KVM will rely on this static branch. This static branch would be used in vcpu_is_preempted() in a subsequent patch. Signed-off-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com> Acked-by: Waiman Long <longman@redhat.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20201202050456.164005-4-srikar@linux.vnet.ibm.com
2020-12-04powerpc: Rename is_kvm_guest() to check_kvm_guest()Srikar Dronamraju
We want to reuse the is_kvm_guest() name in a subsequent patch but with a new body. Hence rename is_kvm_guest() to check_kvm_guest(). No additional changes. Signed-off-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com> Acked-by: Waiman Long <longman@redhat.com> Signed-off-by: kernel test robot <lkp@intel.com> # int -> bool fix [mpe: Fold in fix from lkp to use true/false not 0/1] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20201202050456.164005-3-srikar@linux.vnet.ibm.com
2020-12-04powerpc: Refactor is_kvm_guest() declaration to new headerSrikar Dronamraju
Only code/declaration movement, in anticipation of doing a KVM-aware vcpu_is_preempted(). No additional changes. Signed-off-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com> Acked-by: Waiman Long <longman@redhat.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20201202050456.164005-2-srikar@linux.vnet.ibm.com
2020-12-04powerpc: show registers when unwinding interrupt framesNicholas Piggin
It's often useful to know the register state for interrupts in the stack frame. In the below example (with this patch applied), the important information is the state of the page fault. A blatant case like this probably rather should have the page fault regs passed down to the warning, but quite often there are less obvious cases where an interrupt shows up that might give some more clues. The downside is longer and more complex bug output. Bug: Write fault blocked by AMR! WARNING: CPU: 0 PID: 72 at arch/powerpc/include/asm/book3s/64/kup-radix.h:164 __do_page_fault+0x880/0xa90 Modules linked in: CPU: 0 PID: 72 Comm: systemd-gpt-aut Not tainted NIP: c00000000006e2f0 LR: c00000000006e2ec CTR: 0000000000000000 REGS: c00000000a4f3420 TRAP: 0700 MSR: 8000000000021033 <SF,ME,IR,DR,RI,LE> CR: 28002840 XER: 20040000 CFAR: c000000000128be0 IRQMASK: 3 GPR00: c00000000006e2ec c00000000a4f36c0 c0000000014f0700 0000000000000020 GPR04: 0000000000000001 c000000001290f50 0000000000000001 c000000001290f80 GPR08: c000000001612b08 0000000000000000 0000000000000000 00000000ffffe0f7 GPR12: 0000000048002840 c0000000016e0000 c00c000000021c80 c000000000fd6f60 GPR16: 0000000000000000 c00000000a104698 0000000000000003 c0000000087f0000 GPR20: 0000000000000100 c0000000070330b8 0000000000000000 0000000000000004 GPR24: 0000000002000000 0000000000000300 0000000002000000 c00000000a5b0c00 GPR28: 0000000000000000 000000000a000000 00007fffb2a90038 c00000000a4f3820 NIP [c00000000006e2f0] __do_page_fault+0x880/0xa90 LR [c00000000006e2ec] __do_page_fault+0x87c/0xa90 Call Trace: [c00000000a4f36c0] [c00000000006e2ec] __do_page_fault+0x87c/0xa90 (unreliable) [c00000000a4f3780] [c000000000e1c034] do_page_fault+0x34/0x90 [c00000000a4f37b0] [c000000000008908] data_access_common_virt+0x158/0x1b0 --- interrupt: 300 at __copy_tofrom_user_base+0x9c/0x5a4 NIP: c00000000009b028 LR: c000000000802978 CTR: 0000000000000800 REGS: c00000000a4f3820 TRAP: 0300 MSR: 800000000280b033 <SF,VEC,VSX,EE,FP,ME,IR,DR,RI,LE> CR: 24004840 XER: 00000000 CFAR: c00000000009aff4 DAR: 00007fffb2a90038 DSISR: 0a000000 IRQMASK: 0 GPR00: 0000000000000000 c00000000a4f3ac0 c0000000014f0700 00007fffb2a90028 GPR04: c000000008720010 0000000000010000 0000000000000000 0000000000000000 GPR08: 0000000000000000 0000000000000000 0000000000000000 0000000000000001 GPR12: 0000000000004000 c0000000016e0000 c00c000000021c80 c000000000fd6f60 GPR16: 0000000000000000 c00000000a104698 0000000000000003 c0000000087f0000 GPR20: 0000000000000100 c0000000070330b8 0000000000000000 0000000000000004 GPR24: c00000000a4f3c80 c000000008720000 0000000000010000 0000000000000000 GPR28: 0000000000010000 0000000008720000 0000000000010000 c000000001515b98 NIP [c00000000009b028] __copy_tofrom_user_base+0x9c/0x5a4 LR [c000000000802978] copyout+0x68/0xc0 --- interrupt: 300 [c00000000a4f3af0] [c0000000008074b8] copy_page_to_iter+0x188/0x540 [c00000000a4f3b50] [c00000000035c678] generic_file_buffered_read+0x358/0xd80 [c00000000a4f3c40] [c0000000004c1e90] blkdev_read_iter+0x50/0x80 [c00000000a4f3c60] [c00000000045733c] new_sync_read+0x12c/0x1c0 [c00000000a4f3d00] [c00000000045a1f0] vfs_read+0x1d0/0x240 [c00000000a4f3d50] [c00000000045a7f4] ksys_read+0x84/0x140 [c00000000a4f3da0] [c000000000033a60] system_call_exception+0x100/0x280 [c00000000a4f3e10] [c00000000000c508] system_call_common+0xf8/0x2f8 Instruction dump: eae10078 3be0000b 4bfff890 60420000 792917e1 4182ff18 3c82ffab 3884a5e0 3c62ffab 3863a6e8 480ba891 60000000 <0fe00000> 3be0000b 4bfff860 e93c0938 Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20201107023305.2384874-1-npiggin@gmail.com
2020-12-04powerpc: Use common STABS_DEBUG and DWARF_DEBUG and ELF_DETAILS macroYouling Tang
Use the common STABS_DEBUG and DWARF_DEBUG and ELF_DETAILS macro rule for the linker script in an effort. Signed-off-by: Youling Tang <tangyouling@loongson.cn> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/1606460857-2723-1-git-send-email-tangyouling@loongson.cn
2020-12-04powerpc/64: Fix an EMIT_BUG_ENTRY in head_64.SJordan Niethe
Commit 63ce271b5e37 ("powerpc/prom: convert PROM_BUG() to standard trap") added an EMIT_BUG_ENTRY for the trap after the branch to start_kernel(). The EMIT_BUG_ENTRY was for the address "0b", however the trap was not labeled with "0". Hence the address used for bug is in relative_toc() where the previous "0" label is. Label the trap as "0" so the correct address is used. Fixes: 63ce271b5e37 ("powerpc/prom: convert PROM_BUG() to standard trap") Signed-off-by: Jordan Niethe <jniethe5@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20201130004404.30953-1-jniethe5@gmail.com
2020-12-04powerpc/vdso: Remove VDSO32_LBASE and VDSO64_LBASEChristophe Leroy
VDSO32_LBASE and VDSO64_LBASE are 0. Remove them to simplify code. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/6c4d6570d886bbe1cc471e8ca01602e4b4d9beb5.1601197618.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/vdso: Remove DBG()Christophe Leroy
DBG() is not used anymore. Remove it. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/e11a9b50e709f197bb3aa2ed1d80d2dee8714afc.1601197618.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/vdso: Remove vdso_readyChristophe Leroy
There is no way to get out of vdso_init() prematuraly anymore. Remove vdso_ready as it will always be 1. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/0e1e18c6329b848aa3edeeba76509b4d76182e7d.1601197618.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/vdso: Remove vdso_setup()Christophe Leroy
vdso_fixup_features() cannot fail anymore and that's the only function called by vdso_setup(). vdso_setup() has become trivial and can be removed. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/11522eec6140f510a8c89c63cbb739277d097fdc.1601197618.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/vdso: Remove lib32_elfinfo and lib64_elfinfoChristophe Leroy
lib32_elfinfo and lib64_elfinfo are not used anymore, remove them. Also remove vdso32_kbase and vdso64_kbase while removing the last use. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/01ac65abf22f0428f8f764525a7d84459c54d806.1601197618.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/vdso: Remove symbol section information in struct lib32/64_elfinfoChristophe Leroy
The members related to the symbol section in struct lib32_elfinfo and struct lib64_elfinfo are not used anymore, removed them. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/b779e5b7cc0354e2f87fd407fe5b02f4a8a73825.1601197618.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/vdso: Remove unused text member in struct lib32/64_elfinfoChristophe Leroy
The text member in struct lib32_elfinfo and struct lib64_elfinfo is not used, remove it. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/f53dcc9bb1946a7854d15b34d03d3d2e2003848c.1601197618.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/vdso: Remove vdso_patches[] and associated functionsChristophe Leroy
vdso_patches[] is now empty, remove it and remove all functions that depends on it. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/27d75debd6e4ddeaffe1d66ffed1e7526684a004.1601197618.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/vdso: Remove runtime generated sigtramp offsetsChristophe Leroy
Signal trampoline offsets are now generated at buildtime. Runtime generated offsets are not used anymore, remove them. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/7c192d35a437151837cf4c48aeccb42380d6daac.1601197618.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/vdso: Remove __kernel_datapage_offsetChristophe Leroy
__kernel_datapage_offset is not used anymore, remove it. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/ddb5c746bec4e1a026d7c85243213a1876ef844f.1601197618.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/vdso: Remove vdso32_pages and vdso64_pagesChristophe Leroy
vdso32_pages and vdso64_pages are not used anymore. Remove them. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/bce021f616cbaf39dfb5766cf7ef114adcb918d9.1601197618.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/vdso: Merge __kernel_sync_dicache_p5() into __kernel_sync_dicache()Christophe Leroy
__kernel_sync_dicache_p5() is an alternative to __kernel_sync_dicache() when cpu has CPU_FTR_COHERENT_ICACHE Remove this alternative function and merge __kernel_sync_dicache_p5() into __kernel_sync_dicache() using standard CPU feature fixup. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/4c7dcc6544882761b2b0249d7a8ec2c3a8088cb5.1601197618.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/vdso: Use builtin symbols to locate fixup sectionChristophe Leroy
Add builtin symbols to locate fixup section and use them instead of locating sections through elf headers at runtime. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/2954526981859ca1ccfcfc7a7c4263920e9ddfcb.1601197618.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/vdso: Retrieve sigtramp offsets at buildtimeChristophe Leroy
This is copied from arm64. Instead of using runtime generated signal trampoline offsets, get offsets at buildtime. If the said trampoline doesn't exist, build will fail. So no need to check whether the trampoline exists or not in the VDSO. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/f8bfd6812c3e3678b1cdb4d55a52f9eb022b40d3.1601197618.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/vdso: Remove unused \tmp param in __get_datapage()Christophe Leroy
The \tmp param is not used anymore, remove it. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/4b13f897dcccce8ae03c031a4598cf26b32e2f1c.1601197618.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/vdso: Simplify __get_datapage()Christophe Leroy
The VDSO datapage and the text pages are always located immediately next to each other, so it can be hardcoded without an indirection through __kernel_datapage_offset Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/b08f5ef99d64cfc38f79b7ad5310d9b4d2479eeb.1601197618.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/vdso: Move vdso datapage up frontChristophe Leroy
Move the vdso datapage in front of the VDSO area, before vdso test. This will allow to remove the __kernel_datapage_offset symbol and simplify __get_datapage() in following patches. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/b68c99b6e8ee0b1d99bfa4c7e34c359fc1bc1000.1601197618.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/vdso: Replace vdso_base by vdsoChristophe Leroy
All other architectures but s390 use a void pointer named 'vdso' to reference the VDSO mapping. In a following patch, the VDSO data page will be put in front of text, vdso_base will then not anymore point to VDSO text. To avoid confusion between vdso_base and VDSO text, rename vdso_base into vdso and make it a void __user *. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/8e6cefe474aa4ceba028abb729485cd46c140990.1601197618.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/vdso: Provide vdso_remap()Christophe Leroy
Provide vdso_remap() through _install_special_mapping() and drop arch_remap(). This adds a test of the size and returns -EINVAL if the size is not correct. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/373c66f768fa9cc8890f3b55462209a98c522326.1601197618.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/vdso: Move to _install_special_mapping() and remove arch_vma_name()Christophe Leroy
Copied from commit 2fea7f6c98f5 ("arm64: vdso: move to _install_special_mapping and remove arch_vma_name"). Use the new _install_special_mapping() API added by commit a62c34bd2a8a ("x86, mm: Improve _install_special_mapping and fix x86 vdso naming") which obsolete install_special_mapping(). And remove arch_vma_name() as the name is handled by the new API. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: kernel test robot <lkp@intel.com> [mpe: Squash fix to use PTR_ERR_OR_ZERO() from lkp] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/e7e5dfe0f93234e31051f2a610b4b07f50b0082f.1601197618.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/vdso: Simplify arch_setup_additional_pages() exitChristophe Leroy
To simplify arch_setup_additional_pages() exit, rename it __arch_setup_additional_pages() and create a caller arch_setup_additional_pages() which does the locking. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/603c1d039d3f928ee95e547fcd2219fcf4c3b514.1601197618.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/vdso: Use VDSO size in arch_setup_additional_pages()Christophe Leroy
In arch_setup_additional_pages(), instead of using number of VDSO pages and recalculate VDSO size, directly use the VDSO size. As vdso_ready is set, vdso_pages can't be 0 so just remove the test. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/4edfa548c3885a430b765335dc720105716e273f.1601197618.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/vdso: Remove unnecessary ifdefs in vdso_pagelist initializationChristophe Leroy
No need of all those #ifdefs around the pagelist initialisation, use IS_ENABLED(), GCC will kick out unused static variables. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/f9333432e329b1fcbbbf846cb1cd4a1c4127a60b.1601197618.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/vdso: Refactor 32 bits and 64 bits pages setupChristophe Leroy
The setup of VDSO pages is identical for 32 bits VDSO and 64 bits VDSO. Refactor that setup. And use &vdsoXX_start which is synonym of vdsoXX_kbase. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/269ffb54c37fc1d46128f77d7a39f88ef4a9957d.1601197618.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/vdso: Remove NULL termination element in vdso_pagelistChristophe Leroy
No need of a NULL last element in pagelists, install_special_mapping() knows how long the list is. Remove that element. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/e58d95ab859e3cbc9bae3c9ce2959e17d2864f5d.1601197618.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/vdso: Remove get_page() in vdso_pagelist initializationChristophe Leroy
Partly copied from commit 16fb1a9bec61 ("arm64: vdso: clean up vdso_pagelist initialization"). No need to get_page() the vdso text/data - these are part of the kernel image. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/9d14540bd10832b6c9519d74fb5728fdc4974b36.1601197618.git.christophe.leroy@csgroup.eu
2020-12-04powerpc/vdso: Rename syscall_map_32/64 to simplify vdso_setup_syscall_map()Christophe Leroy
Today vdso_data structure has: - syscall_map_32[] and syscall_map_64[] on PPC64 - syscall_map_32[] on PPC32 On PPC32, syscall_map_32[] is populated using sys_call_table[]. On PPC64, syscall_map_64[] is populated using sys_call_table[] and syscal_map_32[] is populated using compat_sys_call_table[]. To simplify vdso_setup_syscall_map(), - On PPC32 rename syscall_map_32[] into syscall_map[], - On PPC64 rename syscall_map_64[] into syscall_map[], - On PPC64 rename syscall_map_32[] into compat_syscall_map[]. That way, syscall_map[] gets populated using sys_call_table[] and compat_syscall_map[] gets population using compat_sys_call_table[]. Also define an empty compat_syscall_map[] on PPC32 to avoid ifdefs. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/472734be0d9991eee320a06824219a5b2663736b.1601197618.git.christophe.leroy@csgroup.eu
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