diff options
| author | David Brazdil <dbrazdil@google.com> | 2020-09-22 21:49:04 +0100 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2020-09-30 08:33:52 +0100 |
| commit | 717cf94adb54095d14a6674baea73123188f2901 (patch) | |
| tree | 7a09c70a98140d3b1d008851529511d98b7a6284 /arch/arm64/include/asm/percpu.h | |
| parent | 3471ee06e33e413d7fa73c1aa3092e6e794b9e05 (diff) | |
kvm: arm64: Remove __hyp_this_cpu_read
this_cpu_ptr is meant for use in kernel proper because it selects between
TPIDR_EL1/2 based on nVHE/VHE. __hyp_this_cpu_ptr was used in hyp to always
select TPIDR_EL2. Unify all users behind this_cpu_ptr and friends by
selecting _EL2 register under __KVM_NVHE_HYPERVISOR__. VHE continues
selecting the register using alternatives.
Under CONFIG_DEBUG_PREEMPT, the kernel helpers perform a preemption check
which is omitted by the hyp helpers. Preserve the behavior for nVHE by
overriding the corresponding macros under __KVM_NVHE_HYPERVISOR__. Extend
the checks into VHE hyp code.
Signed-off-by: David Brazdil <dbrazdil@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Acked-by: Andrew Scull <ascull@google.com>
Acked-by: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20200922204910.7265-5-dbrazdil@google.com
Diffstat (limited to 'arch/arm64/include/asm/percpu.h')
| -rw-r--r-- | arch/arm64/include/asm/percpu.h | 28 |
1 files changed, 26 insertions, 2 deletions
diff --git a/arch/arm64/include/asm/percpu.h b/arch/arm64/include/asm/percpu.h index 0b6409b89e5e..1599e17379d8 100644 --- a/arch/arm64/include/asm/percpu.h +++ b/arch/arm64/include/asm/percpu.h @@ -19,7 +19,16 @@ static inline void set_my_cpu_offset(unsigned long off) :: "r" (off) : "memory"); } -static inline unsigned long __my_cpu_offset(void) +static inline unsigned long __hyp_my_cpu_offset(void) +{ + /* + * Non-VHE hyp code runs with preemption disabled. No need to hazard + * the register access against barrier() as in __kern_my_cpu_offset. + */ + return read_sysreg(tpidr_el2); +} + +static inline unsigned long __kern_my_cpu_offset(void) { unsigned long off; @@ -35,7 +44,12 @@ static inline unsigned long __my_cpu_offset(void) return off; } -#define __my_cpu_offset __my_cpu_offset() + +#ifdef __KVM_NVHE_HYPERVISOR__ +#define __my_cpu_offset __hyp_my_cpu_offset() +#else +#define __my_cpu_offset __kern_my_cpu_offset() +#endif #define PERCPU_RW_OPS(sz) \ static inline unsigned long __percpu_read_##sz(void *ptr) \ @@ -227,4 +241,14 @@ PERCPU_RET_OP(add, add, ldadd) #include <asm-generic/percpu.h> +/* Redefine macros for nVHE hyp under DEBUG_PREEMPT to avoid its dependencies. */ +#if defined(__KVM_NVHE_HYPERVISOR__) && defined(CONFIG_DEBUG_PREEMPT) +#undef this_cpu_ptr +#define this_cpu_ptr raw_cpu_ptr +#undef __this_cpu_read +#define __this_cpu_read raw_cpu_read +#undef __this_cpu_write +#define __this_cpu_write raw_cpu_write +#endif + #endif /* __ASM_PERCPU_H */ |