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author | David Brazdil <dbrazdil@google.com> | 2020-12-02 18:41:09 +0000 |
---|---|---|
committer | Marc Zyngier <maz@kernel.org> | 2020-12-04 10:08:34 +0000 |
commit | 687413d34d4aa72103de3e545f431f480dd21d7f (patch) | |
tree | 5c5c5f2bc574130b660bcfde236eb85bf1aa5184 /arch/arm64/kvm | |
parent | 2d7bf218ca739554bf7277ab0dbfa5399d01f7c6 (diff) | |
download | linux-687413d34d4aa72103de3e545f431f480dd21d7f.tar.gz linux-687413d34d4aa72103de3e545f431f480dd21d7f.tar.bz2 linux-687413d34d4aa72103de3e545f431f480dd21d7f.zip |
KVM: arm64: Support per_cpu_ptr in nVHE hyp code
When compiling with __KVM_NVHE_HYPERVISOR__, redefine per_cpu_offset()
to __hyp_per_cpu_offset() which looks up the base of the nVHE per-CPU
region of the given cpu and computes its offset from the
.hyp.data..percpu section.
This enables use of per_cpu_ptr() helpers in nVHE hyp code. Until now
only this_cpu_ptr() was supported by setting TPIDR_EL2.
Signed-off-by: David Brazdil <dbrazdil@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20201202184122.26046-14-dbrazdil@google.com
Diffstat (limited to 'arch/arm64/kvm')
-rw-r--r-- | arch/arm64/kvm/hyp/nvhe/Makefile | 3 | ||||
-rw-r--r-- | arch/arm64/kvm/hyp/nvhe/hyp-smp.c | 24 |
2 files changed, 26 insertions, 1 deletions
diff --git a/arch/arm64/kvm/hyp/nvhe/Makefile b/arch/arm64/kvm/hyp/nvhe/Makefile index ddde15fe85f2..2d842e009a40 100644 --- a/arch/arm64/kvm/hyp/nvhe/Makefile +++ b/arch/arm64/kvm/hyp/nvhe/Makefile @@ -6,7 +6,8 @@ asflags-y := -D__KVM_NVHE_HYPERVISOR__ ccflags-y := -D__KVM_NVHE_HYPERVISOR__ -obj-y := timer-sr.o sysreg-sr.o debug-sr.o switch.o tlb.o hyp-init.o host.o hyp-main.o +obj-y := timer-sr.o sysreg-sr.o debug-sr.o switch.o tlb.o hyp-init.o host.o \ + hyp-main.o hyp-smp.o obj-y += ../vgic-v3-sr.o ../aarch32.o ../vgic-v2-cpuif-proxy.o ../entry.o \ ../fpsimd.o ../hyp-entry.o diff --git a/arch/arm64/kvm/hyp/nvhe/hyp-smp.c b/arch/arm64/kvm/hyp/nvhe/hyp-smp.c new file mode 100644 index 000000000000..7b0363b4857f --- /dev/null +++ b/arch/arm64/kvm/hyp/nvhe/hyp-smp.c @@ -0,0 +1,24 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2020 - Google LLC + * Author: David Brazdil <dbrazdil@google.com> + */ + +#include <asm/kvm_asm.h> +#include <asm/kvm_hyp.h> +#include <asm/kvm_mmu.h> + +unsigned long __hyp_per_cpu_offset(unsigned int cpu) +{ + unsigned long *cpu_base_array; + unsigned long this_cpu_base; + unsigned long elf_base; + + if (cpu >= ARRAY_SIZE(kvm_arm_hyp_percpu_base)) + hyp_panic(); + + cpu_base_array = (unsigned long *)hyp_symbol_addr(kvm_arm_hyp_percpu_base); + this_cpu_base = kern_hyp_va(cpu_base_array[cpu]); + elf_base = (unsigned long)hyp_symbol_addr(__per_cpu_start); + return this_cpu_base - elf_base; +} |