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arm64: KVM: Add HYP per-cpu accessors

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As we're going to require to access per-cpu variables at EL2,
let's craft the minimum set of accessors required to implement
reading a per-cpu variable, relying on tpidr_el2 to contain the
per-cpu offset.

Reviewed-by: Christoffer Dall <christoffer.dall@arm.com>
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Marc Zyngier 2018-05-29 13:11:15 +01:00 committed by Catalin Marinas
parent 9cdc0108ba
commit 85478bab40
1 changed files with 25 additions and 2 deletions
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27
arch/arm64/include/asm/kvm_asm.h
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@ -71,14 +71,37 @@ extern u32 __kvm_get_mdcr_el2(void);
extern u32 __init_stage2_translation(void);
/* Home-grown __this_cpu_{ptr,read} variants that always work at HYP */
#define __hyp_this_cpu_ptr(sym) \
({ \
void *__ptr = hyp_symbol_addr(sym); \
__ptr += read_sysreg(tpidr_el2); \
(typeof(&sym))__ptr; \
})
#define __hyp_this_cpu_read(sym) \
({ \
*__hyp_this_cpu_ptr(sym); \
})
#else /* __ASSEMBLY__ */
.macro get_host_ctxt reg, tmp
adr_l \reg, kvm_host_cpu_state
.macro hyp_adr_this_cpu reg, sym, tmp
adr_l \reg, \sym
mrs \tmp, tpidr_el2
add \reg, \reg, \tmp
.endm
.macro hyp_ldr_this_cpu reg, sym, tmp
adr_l \reg, \sym
mrs \tmp, tpidr_el2
ldr \reg, [\reg, \tmp]
.endm
.macro get_host_ctxt reg, tmp
hyp_adr_this_cpu \reg, kvm_host_cpu_state, \tmp
.endm
.macro get_vcpu_ptr vcpu, ctxt
get_host_ctxt \ctxt, \vcpu
ldr \vcpu, [\ctxt, #HOST_CONTEXT_VCPU]