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| author | Marc Zyngier <marc.zyngier@arm.com> | 2018-07-20 12:53:09 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-07-22 15:28:51 +0300 |
| commit | 0592871918f0acf369cec5c88de1fa76dbf2c1a2 (patch) | |
| tree | a46b2112a09f58fae4dd342048e5086c90b34afb /arch/arm64/include/asm | |
| parent | b769d86ea9d4b2d77387791cc747462b19e8af22 (diff) | |
| download | linux-0592871918f0acf369cec5c88de1fa76dbf2c1a2.tar.xz | |
arm64: KVM: Add HYP per-cpu accessors
commit 85478bab409171de501b719971fd25a3d5d639f9 upstream.
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>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/arm64/include/asm')
| -rw-r--r-- | arch/arm64/include/asm/kvm_asm.h | 27 |
1 files changed, 25 insertions, 2 deletions
diff --git a/arch/arm64/include/asm/kvm_asm.h b/arch/arm64/include/asm/kvm_asm.h index 1ed5cb9c322c..b956418f73bd 100644 --- a/arch/arm64/include/asm/kvm_asm.h +++ b/arch/arm64/include/asm/kvm_asm.h @@ -69,14 +69,37 @@ extern u32 __init_stage2_translation(void); extern void __qcom_hyp_sanitize_btac_predictors(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] |