On Thu, 19 Nov 2020 at 17:25, David Brazdil wrote:
>
> Taking a function pointer will now generate a R_AARCH64_RELATIVE that is
> fixed up at early boot. Remove the alternative-based mechanism for
> converting the address from a kernel VA.
>
> Signed-off-by: David Brazdil
Acked-by: Ard Biesheuvel
> ---
> arch/arm64/include/asm/kvm_mmu.h | 18 --
> arch/arm64/kernel/image-vars.h | 1 -
> arch/arm64/kvm/hyp/nvhe/hyp-main.c | 11 ---
> arch/arm64/kvm/va_layout.c | 6 --
> 4 files changed, 4 insertions(+), 32 deletions(-)
>
> diff --git a/arch/arm64/include/asm/kvm_mmu.h
> b/arch/arm64/include/asm/kvm_mmu.h
> index e5226f7e4732..8cb8974ec9cc 100644
> --- a/arch/arm64/include/asm/kvm_mmu.h
> +++ b/arch/arm64/include/asm/kvm_mmu.h
> @@ -121,24 +121,6 @@ static __always_inline unsigned long
> __kern_hyp_va(unsigned long v)
>
> #define kern_hyp_va(v) ((typeof(v))(__kern_hyp_va((unsigned
> long)(v
>
> -static __always_inline unsigned long __kimg_hyp_va(unsigned long v)
> -{
> - unsigned long offset;
> -
> - asm volatile(ALTERNATIVE_CB("movz %0, #0\n"
> - "movk %0, #0, lsl #16\n"
> - "movk %0, #0, lsl #32\n"
> - "movk %0, #0, lsl #48\n",
> - kvm_update_kimg_phys_offset)
> -: "=r" (offset));
> -
> - return __kern_hyp_va((v - offset) | PAGE_OFFSET);
> -}
> -
> -#define kimg_fn_hyp_va(v) ((typeof(*v))(__kimg_hyp_va((unsigned
> long)(v
> -
> -#define kimg_fn_ptr(x) (typeof(x) **)(x)
> -
> /*
> * We currently support using a VM-specified IPA size. For backward
> * compatibility, the default IPA size is fixed to 40bits.
> diff --git a/arch/arm64/kernel/image-vars.h b/arch/arm64/kernel/image-vars.h
> index 8539f34d7538..6379721236cf 100644
> --- a/arch/arm64/kernel/image-vars.h
> +++ b/arch/arm64/kernel/image-vars.h
> @@ -64,7 +64,6 @@ __efistub__ctype = _ctype;
> /* Alternative callbacks for init-time patching of nVHE hyp code. */
> KVM_NVHE_ALIAS(kvm_patch_vector_branch);
> KVM_NVHE_ALIAS(kvm_update_va_mask);
> -KVM_NVHE_ALIAS(kvm_update_kimg_phys_offset);
> KVM_NVHE_ALIAS(kvm_get_kimage_voffset);
>
> /* Global kernel state accessed by nVHE hyp code. */
> diff --git a/arch/arm64/kvm/hyp/nvhe/hyp-main.c
> b/arch/arm64/kvm/hyp/nvhe/hyp-main.c
> index b3db5f4eea27..7998eff5f0a2 100644
> --- a/arch/arm64/kvm/hyp/nvhe/hyp-main.c
> +++ b/arch/arm64/kvm/hyp/nvhe/hyp-main.c
> @@ -110,9 +110,9 @@ static void handle___vgic_v3_restore_aprs(struct
> kvm_cpu_context *host_ctxt)
>
> typedef void (*hcall_t)(struct kvm_cpu_context *);
>
> -#define HANDLE_FUNC(x) [__KVM_HOST_SMCCC_FUNC_##x] = kimg_fn_ptr(handle_##x)
> +#define HANDLE_FUNC(x) [__KVM_HOST_SMCCC_FUNC_##x] = (hcall_t)handle_##x
>
> -static const hcall_t *host_hcall[] = {
> +static const hcall_t host_hcall[] = {
> HANDLE_FUNC(__kvm_vcpu_run),
> HANDLE_FUNC(__kvm_flush_vm_context),
> HANDLE_FUNC(__kvm_tlb_flush_vmid_ipa),
> @@ -132,7 +132,6 @@ static const hcall_t *host_hcall[] = {
> static void handle_host_hcall(struct kvm_cpu_context *host_ctxt)
> {
> DECLARE_REG(unsigned long, id, host_ctxt, 0);
> - const hcall_t *kfn;
> hcall_t hfn;
>
> id -= KVM_HOST_SMCCC_ID(0);
> @@ -140,13 +139,11 @@ static void handle_host_hcall(struct kvm_cpu_context
> *host_ctxt)
> if (unlikely(id >= ARRAY_SIZE(host_hcall)))
> goto inval;
>
> - kfn = host_hcall[id];
> - if (unlikely(!kfn))
> + hfn = host_hcall[id];
> + if (unlikely(!hfn))
> goto inval;
>
> cpu_reg(host_ctxt, 0) = SMCCC_RET_SUCCESS;
> -
> - hfn = kimg_fn_hyp_va(kfn);
> hfn(host_ctxt);
>
> return;
> diff --git a/arch/arm64/kvm/va_layout.c b/arch/arm64/kvm/va_layout.c
> index 7f45a98eacfd..0494315f71f2 100644
> --- a/arch/arm64/kvm/va_layout.c
> +++ b/arch/arm64/kvm/va_layout.c
> @@ -373,12 +373,6 @@ static void generate_mov_q(u64 val, __le32 *origptr,
> __le32 *updptr, int nr_inst
> *updptr++ = cpu_to_le32(insn);
> }
>
> -void kvm_update_kimg_phys_offset(struct alt_instr *alt,
> -__le32 *origptr, __le32 *updptr, int nr_inst)
> -{
> - generate_mov_q(kimage_voffset + PHYS_OFFSET, origptr, updptr,
> nr_inst);
> -}
> -
> void kvm_get_kimage_voffset(struct alt_instr *alt,
> __le32 *origptr, __le32 *updptr, int nr_inst)
> {
> --
> 2.29.2.299.gdc1121823c-goog
>
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