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mirror_ubuntu-kernels/arch/powerpc/kvm
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Jason A. Donenfeld d349ab99ee random: handle archrandom with multiple longs 
The archrandom interface was originally designed for x86, which supplies
RDRAND/RDSEED for receiving random words into registers, resulting in
one function to generate an int and another to generate a long. However,
other architectures don't follow this.

On arm64, the SMCCC TRNG interface can return between one and three
longs. On s390, the CPACF TRNG interface can return arbitrary amounts,
with four longs having the same cost as one. On UML, the os_getrandom()
interface can return arbitrary amounts.

So change the api signature to take a "max_longs" parameter designating
the maximum number of longs requested, and then return the number of
longs generated.

Since callers need to check this return value and loop anyway, each arch
implementation does not bother implementing its own loop to try again to
fill the maximum number of longs. Additionally, all existing callers
pass in a constant max_longs parameter. Taken together, these two things
mean that the codegen doesn't really change much for one-word-at-a-time
platforms, while performance is greatly improved on platforms such as
s390.

Acked-by: Heiko Carstens <hca@linux.ibm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Michael Ellerman <mpe@ellerman.id.au>
Acked-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2022-07-25 13:26:14 +02:00
..
book3s_32_mmu_host.c powerpc/32s: move CTX_TO_VSID() into mmu-hash.h 2021-06-17 00:09:08 +10:00
book3s_32_mmu.c KVM: Use 'unsigned long' as kvm_for_each_vcpu()'s index 2021-12-08 04:24:15 -05:00
book3s_32_sr.S KVM: PPC: Book3S PR: Enable MSR_DR for switch_mmu_context() 2022-05-11 23:03:16 +10:00
book3s_64_entry.S powerpc: Fix all occurences of "the the" 2022-05-22 15:59:43 +10:00
book3s_64_mmu_host.c powerpc/kvm: no need to initialise statics to 0 2022-02-02 20:31:25 +11:00
book3s_64_mmu_hv.c Merge branch 'topic/ppc-kvm' into next 2022-05-19 23:10:42 +10:00
book3s_64_mmu_radix.c KVM: Add helpers to wrap vcpu->srcu_idx and yell if it's abused 2022-04-21 13:16:11 -04:00
book3s_64_mmu.c KVM: Use 'unsigned long' as kvm_for_each_vcpu()'s index 2021-12-08 04:24:15 -05:00
book3s_64_slb.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 266 2019-06-05 17:30:28 +02:00
book3s_64_vio.c KVM: PPC: Book3s: Retire H_PUT_TCE/etc real mode handlers 2022-05-19 00:44:01 +10:00
book3s_emulate.c powerpc: fix typos in comments 2022-05-05 22:12:44 +10:00
book3s_exports.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 266 2019-06-05 17:30:28 +02:00
book3s_hv_builtin.c KVM: PPC: Book3s: Remove real mode interrupt controller hcalls handlers 2022-05-19 00:44:28 +10:00
book3s_hv_hmi.c KVM: PPC: Book3S HV P9: Remove subcore HMI handling 2021-11-24 21:09:03 +11:00
book3s_hv_interrupts.S KVM: PPC: Book3S HV P9: Implement PMU save/restore in C 2021-11-24 21:08:58 +11:00
book3s_hv_nested.c Merge branch 'topic/ppc-kvm' into next 2022-05-19 23:10:42 +10:00
book3s_hv_p9_entry.c Merge branch 'topic/ppc-kvm' into next 2022-05-19 23:10:42 +10:00
book3s_hv_ras.c KVM: PPC: Book3S HV P9: Remove subcore HMI handling 2021-11-24 21:09:03 +11:00
book3s_hv_rm_mmu.c KVM: PPC: Book3S HV P9: Avoid tlbsync sequence on radix guest exit 2021-11-24 21:09:01 +11:00
book3s_hv_rm_xics.c KVM: PPC: Book3s: Remove real mode interrupt controller hcalls handlers 2022-05-19 00:44:28 +10:00
book3s_hv_rmhandlers.S KVM: PPC: Book3s: Remove real mode interrupt controller hcalls handlers 2022-05-19 00:44:28 +10:00
book3s_hv_tm_builtin.c KVM: PPC: Book3S HV: Treat TM-related invalid form instructions on P9 like the valid ones 2020-03-19 16:39:52 +11:00
book3s_hv_tm.c KVM: PPC: Book3S HV Nested: Fix TM softpatch HFAC interrupt emulation 2021-08-25 16:37:17 +10:00
book3s_hv_uvmem.c Merge branch 'topic/ppc-kvm' into next 2022-05-19 23:10:42 +10:00
book3s_hv.c random: handle archrandom with multiple longs 2022-07-25 13:26:14 +02:00
book3s_hv.h KVM: PPC: Book3S HV P9: Use Linux SPR save/restore to manage some host SPRs 2021-11-24 21:09:01 +11:00
book3s_interrupts.S powerpc: Replace PPC64_ELF_ABI_v{1/2} by CONFIG_PPC64_ELF_ABI_V{1/2} 2022-05-19 23:11:29 +10:00
book3s_mmu_hpte.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 266 2019-06-05 17:30:28 +02:00
book3s_paired_singles.c KVM: PPC: Clean up redundant 'kvm_run' parameters 2020-05-27 11:39:31 +10:00
book3s_pr_papr.c KVM: PPC: Book3s: PR: Enable default TCE hypercalls 2022-05-19 00:44:15 +10:00
book3s_pr.c powerpc: fix typos in comments 2022-05-05 22:12:44 +10:00
book3s_rmhandlers.S powerpc: Replace PPC64_ELF_ABI_v{1/2} by CONFIG_PPC64_ELF_ABI_V{1/2} 2022-05-19 23:11:29 +10:00
book3s_rtas.c KVM: Add helpers to wrap vcpu->srcu_idx and yell if it's abused 2022-04-21 13:16:11 -04:00
book3s_segment.S KVM: PPC: Book3S 64: move bad_host_intr check to HV handler 2021-06-10 22:12:12 +10:00
book3s_xics.c powerpc: fix typos in comments 2022-05-05 22:12:44 +10:00
book3s_xics.h KVM: Use 'unsigned long' as kvm_for_each_vcpu()'s index 2021-12-08 04:24:15 -05:00
book3s_xive_native.c powerpc: Fix all occurences of "the the" 2022-05-22 15:59:43 +10:00
book3s_xive.c Merge branch 'topic/ppc-kvm' into next 2022-05-19 23:10:42 +10:00
book3s_xive.h KVM: PPC: Book3s: Remove real mode interrupt controller hcalls handlers 2022-05-19 00:44:28 +10:00
book3s.c KVM: PPC: Avoid referencing userspace memory region in memslot updates 2021-12-08 04:24:22 -05:00
book3s.h KVM: PPC: Book3S PR: Declare kvmppc_handle_exit_pr() 2021-08-20 22:17:38 +10:00
booke_emulate.c KVM: PPC: Clean up redundant 'kvm_run' parameters 2020-05-27 11:39:31 +10:00
booke_interrupts.S KVM: PPC: Clean up redundant kvm_run parameters in assembly 2020-07-23 15:50:01 +10:00
booke.c KVM: Rename kvm_vcpu_block() => kvm_vcpu_halt() 2021-12-08 04:24:51 -05:00
booke.h KVM: PPC: Clean up redundant 'kvm_run' parameters 2020-05-27 11:39:31 +10:00
bookehv_interrupts.S KVM: PPC: Clean up redundant kvm_run parameters in assembly 2020-07-23 15:50:01 +10:00
e500_emulate.c KVM: Use 'unsigned long' as kvm_for_each_vcpu()'s index 2021-12-08 04:24:15 -05:00
e500_mmu_host.c KVM: PPC: Convert to the gfn-based MMU notifier callbacks 2021-04-17 08:31:07 -04:00
e500_mmu_host.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
e500_mmu.c KVM: PPC: Kill kvmppc_ops::mmu_destroy() and kvmppc_mmu_destroy() 2020-03-19 16:43:07 +11:00
e500.c KVM: PPC: Merge powerpc's debugfs entry content into generic entry 2022-02-02 20:30:26 +11:00
e500.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
e500mc.c Merge branch 'topic/ppc-kvm' into next 2022-05-19 23:10:42 +10:00
emulate_loadstore.c KVM: PPC: Book3s: mmio: Deliver DSI after emulation failure 2022-01-31 13:43:00 +11:00
emulate.c KVM: PPC: Clean up redundant 'kvm_run' parameters 2020-05-27 11:39:31 +10:00
fpu.S mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
irq.h
Kconfig KVM: PPC: Book3S PR: Disable SCV when AIL could be disabled 2022-03-08 13:13:58 +11:00
Makefile powerpc: Book3S 64-bit outline-only KASAN support 2022-05-22 15:58:29 +10:00
mpic.c KVM: Remove unnecessary asm/kvm_host.h includes 2020-03-16 17:57:34 +01:00
powerpc.c Merge branch 'topic/ppc-kvm' into next 2022-05-19 23:10:42 +10:00
timing.c KVM: PPC: Merge powerpc's debugfs entry content into generic entry 2022-02-02 20:30:26 +11:00
timing.h KVM: PPC: Merge powerpc's debugfs entry content into generic entry 2022-02-02 20:30:26 +11:00
tm.S treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 174 2019-05-30 11:26:41 -07:00
trace_book3s.h KVM: PPC: Book3S: Simplify external interrupt handling 2018-10-09 16:04:27 +11:00
trace_booke.h KVM: Move arm64's MMU notifier trace events to generic code 2021-04-17 08:30:56 -04:00
trace_hv.h KVM: PPC: Book3S HV: Fix vcore_blocked tracepoint 2022-05-19 00:44:50 +10:00
trace_pr.h KVM: PPC: Move and undef TRACE_INCLUDE_PATH/FILE 2018-11-07 23:04:38 +11:00
trace.h KVM: PPC: Move and undef TRACE_INCLUDE_PATH/FILE 2018-11-07 23:04:38 +11:00