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| author | Marc Zyngier <marc.zyngier@arm.com> | 2015-06-12 12:06:37 +0100 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2015-06-12 15:12:08 +0100 |
| commit | 8a14849b4a355278f0b7baf6e2da7dc7144a23e8 (patch) | |
| tree | 2d674e0345a876b1c0008c644c08e562c8cf8c16 /arch/arm64/kvm | |
| parent | 94a9e04aa16abd1194d9b4158c618ba87f5d01e6 (diff) | |
| download | linux-8a14849b4a355278f0b7baf6e2da7dc7144a23e8.tar.gz | |
arm64: KVM: Switch vgic save/restore to alternative_insn
So far, we configured the world-switch by having a small array of pointers to the save and restore functions, depending on the GIC used on the platform. Loading these values each time is a bit silly (they never change), and it makes sense to rely on the instruction patching instead. This leads to a nice cleanup of the code. Acked-by: Will Deacon <will.deacon@arm.com> Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/kvm')
| -rw-r--r-- | arch/arm64/kvm/hyp.S | 18 |
1 files changed, 4 insertions, 14 deletions
diff --git a/arch/arm64/kvm/hyp.S b/arch/arm64/kvm/hyp.S index 5befd010e232..f1f6d902b772 100644 --- a/arch/arm64/kvm/hyp.S +++ b/arch/arm64/kvm/hyp.S @@ -17,8 +17,10 @@ #include <linux/linkage.h> +#include <asm/alternative.h> #include <asm/asm-offsets.h> #include <asm/assembler.h> +#include <asm/cpufeature.h> #include <asm/debug-monitors.h> #include <asm/esr.h> #include <asm/fpsimdmacros.h> @@ -808,10 +810,7 @@ * Call into the vgic backend for state saving */ .macro save_vgic_state - adr x24, __vgic_sr_vectors - ldr x24, [x24, VGIC_SAVE_FN] - kern_hyp_va x24 - blr x24 + alternative_insn "bl __save_vgic_v2_state", "bl __save_vgic_v3_state", ARM64_HAS_SYSREG_GIC_CPUIF mrs x24, hcr_el2 mov x25, #HCR_INT_OVERRIDE neg x25, x25 @@ -828,10 +827,7 @@ orr x24, x24, #HCR_INT_OVERRIDE orr x24, x24, x25 msr hcr_el2, x24 - adr x24, __vgic_sr_vectors - ldr x24, [x24, #VGIC_RESTORE_FN] - kern_hyp_va x24 - blr x24 + alternative_insn "bl __restore_vgic_v2_state", "bl __restore_vgic_v3_state", ARM64_HAS_SYSREG_GIC_CPUIF .endm .macro save_timer_state @@ -1062,12 +1058,6 @@ ENTRY(__kvm_flush_vm_context) ret ENDPROC(__kvm_flush_vm_context) - // struct vgic_sr_vectors __vgi_sr_vectors; - .align 3 -ENTRY(__vgic_sr_vectors) - .skip VGIC_SR_VECTOR_SZ -ENDPROC(__vgic_sr_vectors) - __kvm_hyp_panic: // Guess the context by looking at VTTBR: // If zero, then we're already a host. |