Re: stable-rc-5.10: arm64: allmodconfig: (.hyp.text+0x1a4c): undefined reference to `__kvm_nvhe_memset'

[Anders Roxell]

On Thu, 1 Dec 2022 at 11:36, Marc Zyngier <maz@xxxxxxxxxx> wrote:
>
> On Thu, 01 Dec 2022 09:39:57 +0000,
> Naresh Kamboju <naresh.kamboju@xxxxxxxxxx> wrote:
> >
> > [please ignore if it is already reported]
> >
> > The stable-rc 5.10 arm64 allmodconfig builds failed with gcc-12.
> > List of build warnings and errors with gcc-12 are listed below.
> >
> > aarch64-linux-gnu-ld: Unexpected GOT/PLT entries detected!
> > aarch64-linux-gnu-ld: Unexpected run-time procedure linkages detected!
> > aarch64-linux-gnu-ld: arch/arm64/kvm/hyp/nvhe/kvm_nvhe.o: in function
> > `__kvm_nvhe___kvm_tlb_flush_vmid_ipa':
> > (.hyp.text+0x1a4c): undefined reference to `__kvm_nvhe_memset'
>
> Stupid gcc. Can you try the following patch and check if this works
> for you?

The patch didn't apply smodly, was a few minor issues.
But it solved the build error.

Cheers,
Anders

>
> Thanks,
>
>         M.
>
> From 4e775885654bd667a519df5ca5aaf702ce438f5e Mon Sep 17 00:00:00 2001
> From: Will Deacon <will@xxxxxxxxxx>
> Date: Fri, 19 Mar 2021 10:01:10 +0000
> Subject: [PATCH] KVM: arm64: Link position-independent string routines into
>  .hyp.text
>
> Commit 7b4a7b5e6fefd15f708f959dd43e188444e252ec upstream.
>
> Pull clear_page(), copy_page(), memcpy() and memset() into the nVHE hyp
> code and ensure that we always execute the '__pi_' entry point on the
> offchance that it changes in future.
>
> [ qperret: Commit title nits and added linker script alias ]
>
> Signed-off-by: Will Deacon <will@xxxxxxxxxx>
> Signed-off-by: Quentin Perret <qperret@xxxxxxxxxx>
> Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx>
> Link: https://lore.kernel.org/r/20210319100146.1149909-3-qperret@xxxxxxxxxx
> ---
>  arch/arm64/include/asm/hyp_image.h |  3 +++
>  arch/arm64/kernel/image-vars.h     | 11 +++++++++++
>  arch/arm64/kvm/hyp/nvhe/Makefile   |  4 ++++
>  3 files changed, 18 insertions(+)
>
> diff --git a/arch/arm64/include/asm/hyp_image.h b/arch/arm64/include/asm/hyp_image.h
> index daa1a1da539e..e06842756051 100644
> --- a/arch/arm64/include/asm/hyp_image.h
> +++ b/arch/arm64/include/asm/hyp_image.h
> @@ -31,6 +31,9 @@
>   */
>  #define KVM_NVHE_ALIAS(sym)    kvm_nvhe_sym(sym) = sym;
>
> +/* Defines a linker script alias for KVM nVHE hyp symbols */
> +#define KVM_NVHE_ALIAS_HYP(first, sec) kvm_nvhe_sym(first) = kvm_nvhe_sym(sec);
> +
>  #endif /* LINKER_SCRIPT */
>
>  #endif /* __ARM64_HYP_IMAGE_H__ */
> diff --git a/arch/arm64/kernel/image-vars.h b/arch/arm64/kernel/image-vars.h
> index c615b285ff5b..48e43b29a2d5 100644
> --- a/arch/arm64/kernel/image-vars.h
> +++ b/arch/arm64/kernel/image-vars.h
> @@ -103,6 +103,17 @@ KVM_NVHE_ALIAS(gic_nonsecure_priorities);
>  KVM_NVHE_ALIAS(__start___kvm_ex_table);
>  KVM_NVHE_ALIAS(__stop___kvm_ex_table);
>
> +/* Position-independent library routines */
> +KVM_NVHE_ALIAS_HYP(clear_page, __pi_clear_page);
> +KVM_NVHE_ALIAS_HYP(copy_page, __pi_copy_page);
> +KVM_NVHE_ALIAS_HYP(memcpy, __pi_memcpy);
> +KVM_NVHE_ALIAS_HYP(memset, __pi_memset);
> +
> +#ifdef CONFIG_KASAN
> +KVM_NVHE_ALIAS_HYP(__memcpy, __pi_memcpy);
> +KVM_NVHE_ALIAS_HYP(__memset, __pi_memset);
> +#endif
> +
>  #endif /* CONFIG_KVM */
>
>  #endif /* __ARM64_KERNEL_IMAGE_VARS_H */
> diff --git a/arch/arm64/kvm/hyp/nvhe/Makefile b/arch/arm64/kvm/hyp/nvhe/Makefile
> index ddde15fe85f2..230bba1a6716 100644
> --- a/arch/arm64/kvm/hyp/nvhe/Makefile
> +++ b/arch/arm64/kvm/hyp/nvhe/Makefile
> @@ -6,9 +6,13 @@
>  asflags-y := -D__KVM_NVHE_HYPERVISOR__
>  ccflags-y := -D__KVM_NVHE_HYPERVISOR__
>
> +lib-objs := clear_page.o copy_page.o memcpy.o memset.o
> +lib-objs := $(addprefix ../../../lib/, $(lib-objs))
> +
>  obj-y := timer-sr.o sysreg-sr.o debug-sr.o switch.o tlb.o hyp-init.o host.o hyp-main.o
>  obj-y += ../vgic-v3-sr.o ../aarch32.o ../vgic-v2-cpuif-proxy.o ../entry.o \
>          ../fpsimd.o ../hyp-entry.o
> +obj-y += $(lib-objs)
>
>  ##
>  ## Build rules for compiling nVHE hyp code
> --
> 2.34.1
>
>
> --
> Without deviation from the norm, progress is not possible.